Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.git] / drivers / acpi / acpica / evmisc.c
1 /******************************************************************************
2  *
3  * Module Name: evmisc - Miscellaneous event manager support functions
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2012, Intel Corp.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions, and the following disclaimer,
16  *    without modification.
17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
18  *    substantially similar to the "NO WARRANTY" disclaimer below
19  *    ("Disclaimer") and any redistribution must be conditioned upon
20  *    including a substantially similar Disclaimer requirement for further
21  *    binary redistribution.
22  * 3. Neither the names of the above-listed copyright holders nor the names
23  *    of any contributors may be used to endorse or promote products derived
24  *    from this software without specific prior written permission.
25  *
26  * Alternatively, this software may be distributed under the terms of the
27  * GNU General Public License ("GPL") version 2 as published by the Free
28  * Software Foundation.
29  *
30  * NO WARRANTY
31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
41  * POSSIBILITY OF SUCH DAMAGES.
42  */
43
44 #include <acpi/acpi.h>
45 #include "accommon.h"
46 #include "acevents.h"
47 #include "acnamesp.h"
48
49 #define _COMPONENT          ACPI_EVENTS
50 ACPI_MODULE_NAME("evmisc")
51
52 /* Local prototypes */
53 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context);
54
55 /*******************************************************************************
56  *
57  * FUNCTION:    acpi_ev_is_notify_object
58  *
59  * PARAMETERS:  Node            - Node to check
60  *
61  * RETURN:      TRUE if notifies allowed on this object
62  *
63  * DESCRIPTION: Check type of node for a object that supports notifies.
64  *
65  *              TBD: This could be replaced by a flag bit in the node.
66  *
67  ******************************************************************************/
68
69 u8 acpi_ev_is_notify_object(struct acpi_namespace_node *node)
70 {
71         switch (node->type) {
72         case ACPI_TYPE_DEVICE:
73         case ACPI_TYPE_PROCESSOR:
74         case ACPI_TYPE_THERMAL:
75                 /*
76                  * These are the ONLY objects that can receive ACPI notifications
77                  */
78                 return (TRUE);
79
80         default:
81                 return (FALSE);
82         }
83 }
84
85 /*******************************************************************************
86  *
87  * FUNCTION:    acpi_ev_queue_notify_request
88  *
89  * PARAMETERS:  Node            - NS node for the notified object
90  *              notify_value    - Value from the Notify() request
91  *
92  * RETURN:      Status
93  *
94  * DESCRIPTION: Dispatch a device notification event to a previously
95  *              installed handler.
96  *
97  ******************************************************************************/
98
99 acpi_status
100 acpi_ev_queue_notify_request(struct acpi_namespace_node * node,
101                              u32 notify_value)
102 {
103         union acpi_operand_object *obj_desc;
104         union acpi_operand_object *handler_obj = NULL;
105         union acpi_generic_state *notify_info;
106         acpi_status status = AE_OK;
107
108         ACPI_FUNCTION_NAME(ev_queue_notify_request);
109
110         /*
111          * For value 0x03 (Ejection Request), may need to run a device method.
112          * For value 0x02 (Device Wake), if _PRW exists, may need to run
113          *   the _PS0 method.
114          * For value 0x80 (Status Change) on the power button or sleep button,
115          *   initiate soft-off or sleep operation.
116          *
117          * For all cases, simply dispatch the notify to the handler.
118          */
119         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
120                           "Dispatching Notify on [%4.4s] (%s) Value 0x%2.2X (%s) Node %p\n",
121                           acpi_ut_get_node_name(node),
122                           acpi_ut_get_type_name(node->type), notify_value,
123                           acpi_ut_get_notify_name(notify_value), node));
124
125         /* Get the notify object attached to the NS Node */
126
127         obj_desc = acpi_ns_get_attached_object(node);
128         if (obj_desc) {
129
130                 /* We have the notify object, Get the correct handler */
131
132                 switch (node->type) {
133
134                         /* Notify is allowed only on these types */
135
136                 case ACPI_TYPE_DEVICE:
137                 case ACPI_TYPE_THERMAL:
138                 case ACPI_TYPE_PROCESSOR:
139
140                         if (notify_value <= ACPI_MAX_SYS_NOTIFY) {
141                                 handler_obj =
142                                     obj_desc->common_notify.system_notify;
143                         } else {
144                                 handler_obj =
145                                     obj_desc->common_notify.device_notify;
146                         }
147                         break;
148
149                 default:
150
151                         /* All other types are not supported */
152
153                         return (AE_TYPE);
154                 }
155         }
156
157         /*
158          * If there is a handler to run, schedule the dispatcher.
159          * Check for:
160          * 1) Global system notify handler
161          * 2) Global device notify handler
162          * 3) Per-device notify handler
163          */
164         if ((acpi_gbl_system_notify.handler &&
165              (notify_value <= ACPI_MAX_SYS_NOTIFY)) ||
166             (acpi_gbl_device_notify.handler &&
167              (notify_value > ACPI_MAX_SYS_NOTIFY)) || handler_obj) {
168                 notify_info = acpi_ut_create_generic_state();
169                 if (!notify_info) {
170                         return (AE_NO_MEMORY);
171                 }
172
173                 if (!handler_obj) {
174                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
175                                           "Executing system notify handler for Notify (%4.4s, %X) "
176                                           "node %p\n",
177                                           acpi_ut_get_node_name(node),
178                                           notify_value, node));
179                 }
180
181                 notify_info->common.descriptor_type =
182                     ACPI_DESC_TYPE_STATE_NOTIFY;
183                 notify_info->notify.node = node;
184                 notify_info->notify.value = (u16) notify_value;
185                 notify_info->notify.handler_obj = handler_obj;
186
187                 status =
188                     acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_ev_notify_dispatch,
189                                     notify_info);
190                 if (ACPI_FAILURE(status)) {
191                         acpi_ut_delete_generic_state(notify_info);
192                 }
193         } else {
194                 /* There is no notify handler (per-device or system) for this device */
195
196                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
197                                   "No notify handler for Notify (%4.4s, %X) node %p\n",
198                                   acpi_ut_get_node_name(node), notify_value,
199                                   node));
200         }
201
202         return (status);
203 }
204
205 /*******************************************************************************
206  *
207  * FUNCTION:    acpi_ev_notify_dispatch
208  *
209  * PARAMETERS:  Context         - To be passed to the notify handler
210  *
211  * RETURN:      None.
212  *
213  * DESCRIPTION: Dispatch a device notification event to a previously
214  *              installed handler.
215  *
216  ******************************************************************************/
217
218 static void ACPI_SYSTEM_XFACE acpi_ev_notify_dispatch(void *context)
219 {
220         union acpi_generic_state *notify_info =
221             (union acpi_generic_state *)context;
222         acpi_notify_handler global_handler = NULL;
223         void *global_context = NULL;
224         union acpi_operand_object *handler_obj;
225
226         ACPI_FUNCTION_ENTRY();
227
228         /*
229          * We will invoke a global notify handler if installed. This is done
230          * _before_ we invoke the per-device handler attached to the device.
231          */
232         if (notify_info->notify.value <= ACPI_MAX_SYS_NOTIFY) {
233
234                 /* Global system notification handler */
235
236                 if (acpi_gbl_system_notify.handler) {
237                         global_handler = acpi_gbl_system_notify.handler;
238                         global_context = acpi_gbl_system_notify.context;
239                 }
240         } else {
241                 /* Global driver notification handler */
242
243                 if (acpi_gbl_device_notify.handler) {
244                         global_handler = acpi_gbl_device_notify.handler;
245                         global_context = acpi_gbl_device_notify.context;
246                 }
247         }
248
249         /* Invoke the system handler first, if present */
250
251         if (global_handler) {
252                 global_handler(notify_info->notify.node,
253                                notify_info->notify.value, global_context);
254         }
255
256         /* Now invoke the per-device handler, if present */
257
258         handler_obj = notify_info->notify.handler_obj;
259         if (handler_obj) {
260                 struct acpi_object_notify_handler *notifier;
261
262                 notifier = &handler_obj->notify;
263                 while (notifier) {
264                         notifier->handler(notify_info->notify.node,
265                                           notify_info->notify.value,
266                                           notifier->context);
267                         notifier = notifier->next;
268                 }
269         }
270
271         /* All done with the info object */
272
273         acpi_ut_delete_generic_state(notify_info);
274 }
275
276 #if (!ACPI_REDUCED_HARDWARE)
277 /******************************************************************************
278  *
279  * FUNCTION:    acpi_ev_terminate
280  *
281  * PARAMETERS:  none
282  *
283  * RETURN:      none
284  *
285  * DESCRIPTION: Disable events and free memory allocated for table storage.
286  *
287  ******************************************************************************/
288
289 void acpi_ev_terminate(void)
290 {
291         u32 i;
292         acpi_status status;
293
294         ACPI_FUNCTION_TRACE(ev_terminate);
295
296         if (acpi_gbl_events_initialized) {
297                 /*
298                  * Disable all event-related functionality. In all cases, on error,
299                  * print a message but obviously we don't abort.
300                  */
301
302                 /* Disable all fixed events */
303
304                 for (i = 0; i < ACPI_NUM_FIXED_EVENTS; i++) {
305                         status = acpi_disable_event(i, 0);
306                         if (ACPI_FAILURE(status)) {
307                                 ACPI_ERROR((AE_INFO,
308                                             "Could not disable fixed event %u",
309                                             (u32) i));
310                         }
311                 }
312
313                 /* Disable all GPEs in all GPE blocks */
314
315                 status = acpi_ev_walk_gpe_list(acpi_hw_disable_gpe_block, NULL);
316
317                 /* Remove SCI handler */
318
319                 status = acpi_ev_remove_sci_handler();
320                 if (ACPI_FAILURE(status)) {
321                         ACPI_ERROR((AE_INFO, "Could not remove SCI handler"));
322                 }
323
324                 status = acpi_ev_remove_global_lock_handler();
325                 if (ACPI_FAILURE(status)) {
326                         ACPI_ERROR((AE_INFO,
327                                     "Could not remove Global Lock handler"));
328                 }
329         }
330
331         /* Deallocate all handler objects installed within GPE info structs */
332
333         status = acpi_ev_walk_gpe_list(acpi_ev_delete_gpe_handlers, NULL);
334
335         /* Return to original mode if necessary */
336
337         if (acpi_gbl_original_mode == ACPI_SYS_MODE_LEGACY) {
338                 status = acpi_disable();
339                 if (ACPI_FAILURE(status)) {
340                         ACPI_WARNING((AE_INFO, "AcpiDisable failed"));
341                 }
342         }
343         return_VOID;
344 }
345
346 #endif                          /* !ACPI_REDUCED_HARDWARE */