1 /******************************************************************************
2 *
3 * Module Name: evxface - External interfaces for ACPI events
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 <linux/export.h>
45 #include <acpi/acpi.h>
46 #include "accommon.h"
47 #include "acnamesp.h"
48 #include "acevents.h"
49 #include "acinterp.h"
50
51 #define _COMPONENT ACPI_EVENTS
52 ACPI_MODULE_NAME("evxface")
53
54
55 /*******************************************************************************
56 *
57 * FUNCTION: acpi_populate_handler_object
58 *
59 * PARAMETERS: handler_obj - Handler object to populate
60 * handler_type - The type of handler:
61 * ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
62 * ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
63 * ACPI_ALL_NOTIFY: both system and device
64 * handler - Address of the handler
65 * context - Value passed to the handler on each GPE
66 * next - Address of a handler object to link to
67 *
68 * RETURN: None
69 *
70 * DESCRIPTION: Populate a handler object.
71 *
72 ******************************************************************************/
73 static void
acpi_populate_handler_object(struct acpi_object_notify_handler * handler_obj,u32 handler_type,acpi_notify_handler handler,void * context,struct acpi_object_notify_handler * next)74 acpi_populate_handler_object(struct acpi_object_notify_handler *handler_obj,
75 u32 handler_type,
76 acpi_notify_handler handler, void *context,
77 struct acpi_object_notify_handler *next)
78 {
79 handler_obj->handler_type = handler_type;
80 handler_obj->handler = handler;
81 handler_obj->context = context;
82 handler_obj->next = next;
83 }
84
85 /*******************************************************************************
86 *
87 * FUNCTION: acpi_add_handler_object
88 *
89 * PARAMETERS: parent_obj - Parent of the new object
90 * handler - Address of the handler
91 * context - Value passed to the handler on each GPE
92 *
93 * RETURN: Status
94 *
95 * DESCRIPTION: Create a new handler object and populate it.
96 *
97 ******************************************************************************/
98 static acpi_status
acpi_add_handler_object(struct acpi_object_notify_handler * parent_obj,acpi_notify_handler handler,void * context)99 acpi_add_handler_object(struct acpi_object_notify_handler *parent_obj,
100 acpi_notify_handler handler, void *context)
101 {
102 struct acpi_object_notify_handler *handler_obj;
103
104 /* The parent must not be a defice notify handler object. */
105 if (parent_obj->handler_type & ACPI_DEVICE_NOTIFY)
106 return AE_BAD_PARAMETER;
107
108 handler_obj = ACPI_ALLOCATE_ZEROED(sizeof(*handler_obj));
109 if (!handler_obj)
110 return AE_NO_MEMORY;
111
112 acpi_populate_handler_object(handler_obj,
113 ACPI_SYSTEM_NOTIFY,
114 handler, context,
115 parent_obj->next);
116 parent_obj->next = handler_obj;
117
118 return AE_OK;
119 }
120
121
122 /*******************************************************************************
123 *
124 * FUNCTION: acpi_install_notify_handler
125 *
126 * PARAMETERS: Device - The device for which notifies will be handled
127 * handler_type - The type of handler:
128 * ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
129 * ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
130 * ACPI_ALL_NOTIFY: both system and device
131 * Handler - Address of the handler
132 * Context - Value passed to the handler on each GPE
133 *
134 * RETURN: Status
135 *
136 * DESCRIPTION: Install a handler for notifies on an ACPI device
137 *
138 ******************************************************************************/
139 acpi_status
acpi_install_notify_handler(acpi_handle device,u32 handler_type,acpi_notify_handler handler,void * context)140 acpi_install_notify_handler(acpi_handle device,
141 u32 handler_type,
142 acpi_notify_handler handler, void *context)
143 {
144 union acpi_operand_object *obj_desc;
145 union acpi_operand_object *notify_obj;
146 struct acpi_namespace_node *node;
147 acpi_status status;
148
149 ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
150
151 /* Parameter validation */
152
153 if ((!device) ||
154 (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
155 return_ACPI_STATUS(AE_BAD_PARAMETER);
156 }
157
158 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
159 if (ACPI_FAILURE(status)) {
160 return_ACPI_STATUS(status);
161 }
162
163 /* Convert and validate the device handle */
164
165 node = acpi_ns_validate_handle(device);
166 if (!node) {
167 status = AE_BAD_PARAMETER;
168 goto unlock_and_exit;
169 }
170
171 /*
172 * Root Object:
173 * Registering a notify handler on the root object indicates that the
174 * caller wishes to receive notifications for all objects. Note that
175 * only one <external> global handler can be regsitered (per notify type).
176 */
177 if (device == ACPI_ROOT_OBJECT) {
178
179 /* Make sure the handler is not already installed */
180
181 if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
182 acpi_gbl_system_notify.handler) ||
183 ((handler_type & ACPI_DEVICE_NOTIFY) &&
184 acpi_gbl_device_notify.handler)) {
185 status = AE_ALREADY_EXISTS;
186 goto unlock_and_exit;
187 }
188
189 if (handler_type & ACPI_SYSTEM_NOTIFY) {
190 acpi_gbl_system_notify.node = node;
191 acpi_gbl_system_notify.handler = handler;
192 acpi_gbl_system_notify.context = context;
193 }
194
195 if (handler_type & ACPI_DEVICE_NOTIFY) {
196 acpi_gbl_device_notify.node = node;
197 acpi_gbl_device_notify.handler = handler;
198 acpi_gbl_device_notify.context = context;
199 }
200
201 /* Global notify handler installed */
202 }
203
204 /*
205 * All Other Objects:
206 * Caller will only receive notifications specific to the target object.
207 * Note that only certain object types can receive notifications.
208 */
209 else {
210 /* Notifies allowed on this object? */
211
212 if (!acpi_ev_is_notify_object(node)) {
213 status = AE_TYPE;
214 goto unlock_and_exit;
215 }
216
217 /* Check for an existing internal object */
218
219 obj_desc = acpi_ns_get_attached_object(node);
220 if (obj_desc) {
221
222 /* Object exists. */
223
224 /* For a device notify, make sure there's no handler. */
225 if ((handler_type & ACPI_DEVICE_NOTIFY) &&
226 obj_desc->common_notify.device_notify) {
227 status = AE_ALREADY_EXISTS;
228 goto unlock_and_exit;
229 }
230
231 /* System notifies may have more handlers installed. */
232 notify_obj = obj_desc->common_notify.system_notify;
233
234 if ((handler_type & ACPI_SYSTEM_NOTIFY) && notify_obj) {
235 struct acpi_object_notify_handler *parent_obj;
236
237 if (handler_type & ACPI_DEVICE_NOTIFY) {
238 status = AE_ALREADY_EXISTS;
239 goto unlock_and_exit;
240 }
241
242 parent_obj = ¬ify_obj->notify;
243 status = acpi_add_handler_object(parent_obj,
244 handler,
245 context);
246 goto unlock_and_exit;
247 }
248 } else {
249 /* Create a new object */
250
251 obj_desc = acpi_ut_create_internal_object(node->type);
252 if (!obj_desc) {
253 status = AE_NO_MEMORY;
254 goto unlock_and_exit;
255 }
256
257 /* Attach new object to the Node */
258
259 status =
260 acpi_ns_attach_object(device, obj_desc, node->type);
261
262 /* Remove local reference to the object */
263
264 acpi_ut_remove_reference(obj_desc);
265 if (ACPI_FAILURE(status)) {
266 goto unlock_and_exit;
267 }
268 }
269
270 /* Install the handler */
271
272 notify_obj =
273 acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
274 if (!notify_obj) {
275 status = AE_NO_MEMORY;
276 goto unlock_and_exit;
277 }
278
279 acpi_populate_handler_object(¬ify_obj->notify,
280 handler_type,
281 handler, context,
282 NULL);
283
284 if (handler_type & ACPI_SYSTEM_NOTIFY) {
285 obj_desc->common_notify.system_notify = notify_obj;
286 }
287
288 if (handler_type & ACPI_DEVICE_NOTIFY) {
289 obj_desc->common_notify.device_notify = notify_obj;
290 }
291
292 if (handler_type == ACPI_ALL_NOTIFY) {
293
294 /* Extra ref if installed in both */
295
296 acpi_ut_add_reference(notify_obj);
297 }
298 }
299
300 unlock_and_exit:
301 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
302 return_ACPI_STATUS(status);
303 }
304
ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)305 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
306
307 /*******************************************************************************
308 *
309 * FUNCTION: acpi_remove_notify_handler
310 *
311 * PARAMETERS: Device - The device for which notifies will be handled
312 * handler_type - The type of handler:
313 * ACPI_SYSTEM_NOTIFY: system_handler (00-7f)
314 * ACPI_DEVICE_NOTIFY: driver_handler (80-ff)
315 * ACPI_ALL_NOTIFY: both system and device
316 * Handler - Address of the handler
317 *
318 * RETURN: Status
319 *
320 * DESCRIPTION: Remove a handler for notifies on an ACPI device
321 *
322 ******************************************************************************/
323 acpi_status
324 acpi_remove_notify_handler(acpi_handle device,
325 u32 handler_type, acpi_notify_handler handler)
326 {
327 union acpi_operand_object *notify_obj;
328 union acpi_operand_object *obj_desc;
329 struct acpi_namespace_node *node;
330 acpi_status status;
331
332 ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
333
334 /* Parameter validation */
335
336 if ((!device) ||
337 (!handler) || (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
338 status = AE_BAD_PARAMETER;
339 goto exit;
340 }
341
342
343 /* Make sure all deferred tasks are completed */
344 acpi_os_wait_events_complete(NULL);
345
346 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
347 if (ACPI_FAILURE(status)) {
348 goto exit;
349 }
350
351 /* Convert and validate the device handle */
352
353 node = acpi_ns_validate_handle(device);
354 if (!node) {
355 status = AE_BAD_PARAMETER;
356 goto unlock_and_exit;
357 }
358
359 /* Root Object */
360
361 if (device == ACPI_ROOT_OBJECT) {
362 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
363 "Removing notify handler for namespace root object\n"));
364
365 if (((handler_type & ACPI_SYSTEM_NOTIFY) &&
366 !acpi_gbl_system_notify.handler) ||
367 ((handler_type & ACPI_DEVICE_NOTIFY) &&
368 !acpi_gbl_device_notify.handler)) {
369 status = AE_NOT_EXIST;
370 goto unlock_and_exit;
371 }
372
373 if (handler_type & ACPI_SYSTEM_NOTIFY) {
374 acpi_gbl_system_notify.node = NULL;
375 acpi_gbl_system_notify.handler = NULL;
376 acpi_gbl_system_notify.context = NULL;
377 }
378
379 if (handler_type & ACPI_DEVICE_NOTIFY) {
380 acpi_gbl_device_notify.node = NULL;
381 acpi_gbl_device_notify.handler = NULL;
382 acpi_gbl_device_notify.context = NULL;
383 }
384 }
385
386 /* All Other Objects */
387
388 else {
389 /* Notifies allowed on this object? */
390
391 if (!acpi_ev_is_notify_object(node)) {
392 status = AE_TYPE;
393 goto unlock_and_exit;
394 }
395
396 /* Check for an existing internal object */
397
398 obj_desc = acpi_ns_get_attached_object(node);
399 if (!obj_desc) {
400 status = AE_NOT_EXIST;
401 goto unlock_and_exit;
402 }
403
404 /* Object exists - make sure there's an existing handler */
405
406 if (handler_type & ACPI_SYSTEM_NOTIFY) {
407 struct acpi_object_notify_handler *handler_obj;
408 struct acpi_object_notify_handler *parent_obj;
409
410 notify_obj = obj_desc->common_notify.system_notify;
411 if (!notify_obj) {
412 status = AE_NOT_EXIST;
413 goto unlock_and_exit;
414 }
415
416 handler_obj = ¬ify_obj->notify;
417 parent_obj = NULL;
418 while (handler_obj->handler != handler) {
419 if (handler_obj->next) {
420 parent_obj = handler_obj;
421 handler_obj = handler_obj->next;
422 } else {
423 break;
424 }
425 }
426
427 if (handler_obj->handler != handler) {
428 status = AE_BAD_PARAMETER;
429 goto unlock_and_exit;
430 }
431
432 /*
433 * Remove the handler. There are three possible cases.
434 * First, we may need to remove a non-embedded object.
435 * Second, we may need to remove the embedded object's
436 * handler data, while non-embedded objects exist.
437 * Finally, we may need to remove the embedded object
438 * entirely along with its container.
439 */
440 if (parent_obj) {
441 /* Non-embedded object is being removed. */
442 parent_obj->next = handler_obj->next;
443 ACPI_FREE(handler_obj);
444 } else if (notify_obj->notify.next) {
445 /*
446 * The handler matches the embedded object, but
447 * there are more handler objects in the list.
448 * Replace the embedded object's data with the
449 * first next object's data and remove that
450 * object.
451 */
452 parent_obj = ¬ify_obj->notify;
453 handler_obj = notify_obj->notify.next;
454 *parent_obj = *handler_obj;
455 ACPI_FREE(handler_obj);
456 } else {
457 /* No more handler objects in the list. */
458 obj_desc->common_notify.system_notify = NULL;
459 acpi_ut_remove_reference(notify_obj);
460 }
461 }
462
463 if (handler_type & ACPI_DEVICE_NOTIFY) {
464 notify_obj = obj_desc->common_notify.device_notify;
465 if (!notify_obj) {
466 status = AE_NOT_EXIST;
467 goto unlock_and_exit;
468 }
469
470 if (notify_obj->notify.handler != handler) {
471 status = AE_BAD_PARAMETER;
472 goto unlock_and_exit;
473 }
474
475 /* Remove the handler */
476 obj_desc->common_notify.device_notify = NULL;
477 acpi_ut_remove_reference(notify_obj);
478 }
479 }
480
481 unlock_and_exit:
482 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
483 exit:
484 if (ACPI_FAILURE(status))
485 ACPI_EXCEPTION((AE_INFO, status, "Removing notify handler"));
486 return_ACPI_STATUS(status);
487 }
488
ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)489 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
490
491 /*******************************************************************************
492 *
493 * FUNCTION: acpi_install_exception_handler
494 *
495 * PARAMETERS: Handler - Pointer to the handler function for the
496 * event
497 *
498 * RETURN: Status
499 *
500 * DESCRIPTION: Saves the pointer to the handler function
501 *
502 ******************************************************************************/
503 #ifdef ACPI_FUTURE_USAGE
504 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
505 {
506 acpi_status status;
507
508 ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
509
510 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
511 if (ACPI_FAILURE(status)) {
512 return_ACPI_STATUS(status);
513 }
514
515 /* Don't allow two handlers. */
516
517 if (acpi_gbl_exception_handler) {
518 status = AE_ALREADY_EXISTS;
519 goto cleanup;
520 }
521
522 /* Install the handler */
523
524 acpi_gbl_exception_handler = handler;
525
526 cleanup:
527 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
528 return_ACPI_STATUS(status);
529 }
530
ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)531 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
532 #endif /* ACPI_FUTURE_USAGE */
533
534 #if (!ACPI_REDUCED_HARDWARE)
535 /*******************************************************************************
536 *
537 * FUNCTION: acpi_install_global_event_handler
538 *
539 * PARAMETERS: Handler - Pointer to the global event handler function
540 * Context - Value passed to the handler on each event
541 *
542 * RETURN: Status
543 *
544 * DESCRIPTION: Saves the pointer to the handler function. The global handler
545 * is invoked upon each incoming GPE and Fixed Event. It is
546 * invoked at interrupt level at the time of the event dispatch.
547 * Can be used to update event counters, etc.
548 *
549 ******************************************************************************/
550 acpi_status
551 acpi_install_global_event_handler(ACPI_GBL_EVENT_HANDLER handler, void *context)
552 {
553 acpi_status status;
554
555 ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
556
557 /* Parameter validation */
558
559 if (!handler) {
560 return_ACPI_STATUS(AE_BAD_PARAMETER);
561 }
562
563 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
564 if (ACPI_FAILURE(status)) {
565 return_ACPI_STATUS(status);
566 }
567
568 /* Don't allow two handlers. */
569
570 if (acpi_gbl_global_event_handler) {
571 status = AE_ALREADY_EXISTS;
572 goto cleanup;
573 }
574
575 acpi_gbl_global_event_handler = handler;
576 acpi_gbl_global_event_handler_context = context;
577
578 cleanup:
579 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
580 return_ACPI_STATUS(status);
581 }
582
ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)583 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
584
585 /*******************************************************************************
586 *
587 * FUNCTION: acpi_install_fixed_event_handler
588 *
589 * PARAMETERS: Event - Event type to enable.
590 * Handler - Pointer to the handler function for the
591 * event
592 * Context - Value passed to the handler on each GPE
593 *
594 * RETURN: Status
595 *
596 * DESCRIPTION: Saves the pointer to the handler function and then enables the
597 * event.
598 *
599 ******************************************************************************/
600 acpi_status
601 acpi_install_fixed_event_handler(u32 event,
602 acpi_event_handler handler, void *context)
603 {
604 acpi_status status;
605
606 ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
607
608 /* Parameter validation */
609
610 if (event > ACPI_EVENT_MAX) {
611 return_ACPI_STATUS(AE_BAD_PARAMETER);
612 }
613
614 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
615 if (ACPI_FAILURE(status)) {
616 return_ACPI_STATUS(status);
617 }
618
619 /* Don't allow two handlers. */
620
621 if (NULL != acpi_gbl_fixed_event_handlers[event].handler) {
622 status = AE_ALREADY_EXISTS;
623 goto cleanup;
624 }
625
626 /* Install the handler before enabling the event */
627
628 acpi_gbl_fixed_event_handlers[event].handler = handler;
629 acpi_gbl_fixed_event_handlers[event].context = context;
630
631 status = acpi_clear_event(event);
632 if (ACPI_SUCCESS(status))
633 status = acpi_enable_event(event, 0);
634 if (ACPI_FAILURE(status)) {
635 ACPI_WARNING((AE_INFO, "Could not enable fixed event 0x%X",
636 event));
637
638 /* Remove the handler */
639
640 acpi_gbl_fixed_event_handlers[event].handler = NULL;
641 acpi_gbl_fixed_event_handlers[event].context = NULL;
642 } else {
643 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
644 "Enabled fixed event %X, Handler=%p\n", event,
645 handler));
646 }
647
648 cleanup:
649 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
650 return_ACPI_STATUS(status);
651 }
652
ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)653 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
654
655 /*******************************************************************************
656 *
657 * FUNCTION: acpi_remove_fixed_event_handler
658 *
659 * PARAMETERS: Event - Event type to disable.
660 * Handler - Address of the handler
661 *
662 * RETURN: Status
663 *
664 * DESCRIPTION: Disables the event and unregisters the event handler.
665 *
666 ******************************************************************************/
667 acpi_status
668 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
669 {
670 acpi_status status = AE_OK;
671
672 ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
673
674 /* Parameter validation */
675
676 if (event > ACPI_EVENT_MAX) {
677 return_ACPI_STATUS(AE_BAD_PARAMETER);
678 }
679
680 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
681 if (ACPI_FAILURE(status)) {
682 return_ACPI_STATUS(status);
683 }
684
685 /* Disable the event before removing the handler */
686
687 status = acpi_disable_event(event, 0);
688
689 /* Always Remove the handler */
690
691 acpi_gbl_fixed_event_handlers[event].handler = NULL;
692 acpi_gbl_fixed_event_handlers[event].context = NULL;
693
694 if (ACPI_FAILURE(status)) {
695 ACPI_WARNING((AE_INFO,
696 "Could not write to fixed event enable register 0x%X",
697 event));
698 } else {
699 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Disabled fixed event %X\n",
700 event));
701 }
702
703 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
704 return_ACPI_STATUS(status);
705 }
706
ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)707 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
708
709 /*******************************************************************************
710 *
711 * FUNCTION: acpi_install_gpe_handler
712 *
713 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
714 * defined GPEs)
715 * gpe_number - The GPE number within the GPE block
716 * Type - Whether this GPE should be treated as an
717 * edge- or level-triggered interrupt.
718 * Address - Address of the handler
719 * Context - Value passed to the handler on each GPE
720 *
721 * RETURN: Status
722 *
723 * DESCRIPTION: Install a handler for a General Purpose Event.
724 *
725 ******************************************************************************/
726 acpi_status
727 acpi_install_gpe_handler(acpi_handle gpe_device,
728 u32 gpe_number,
729 u32 type, acpi_gpe_handler address, void *context)
730 {
731 struct acpi_gpe_event_info *gpe_event_info;
732 struct acpi_gpe_handler_info *handler;
733 acpi_status status;
734 acpi_cpu_flags flags;
735
736 ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
737
738 /* Parameter validation */
739
740 if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
741 return_ACPI_STATUS(AE_BAD_PARAMETER);
742 }
743
744 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
745 if (ACPI_FAILURE(status)) {
746 return_ACPI_STATUS(status);
747 }
748
749 /* Allocate memory for the handler object */
750
751 handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
752 if (!handler) {
753 status = AE_NO_MEMORY;
754 goto unlock_and_exit;
755 }
756
757 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
758
759 /* Ensure that we have a valid GPE number */
760
761 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
762 if (!gpe_event_info) {
763 status = AE_BAD_PARAMETER;
764 goto free_and_exit;
765 }
766
767 /* Make sure that there isn't a handler there already */
768
769 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
770 ACPI_GPE_DISPATCH_HANDLER) {
771 status = AE_ALREADY_EXISTS;
772 goto free_and_exit;
773 }
774
775 /* Allocate and init handler object */
776
777 handler->address = address;
778 handler->context = context;
779 handler->method_node = gpe_event_info->dispatch.method_node;
780 handler->original_flags = gpe_event_info->flags &
781 (ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
782
783 /*
784 * If the GPE is associated with a method, it might have been enabled
785 * automatically during initialization, in which case it has to be
786 * disabled now to avoid spurious execution of the handler.
787 */
788
789 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
790 && gpe_event_info->runtime_count) {
791 handler->originally_enabled = 1;
792 (void)acpi_ev_remove_gpe_reference(gpe_event_info);
793 }
794
795 /* Install the handler */
796
797 gpe_event_info->dispatch.handler = handler;
798
799 /* Setup up dispatch flags to indicate handler (vs. method) */
800
801 gpe_event_info->flags &=
802 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
803 gpe_event_info->flags |= (u8) (type | ACPI_GPE_DISPATCH_HANDLER);
804
805 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
806
807 unlock_and_exit:
808 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
809 return_ACPI_STATUS(status);
810
811 free_and_exit:
812 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
813 ACPI_FREE(handler);
814 goto unlock_and_exit;
815 }
816
ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)817 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
818
819 /*******************************************************************************
820 *
821 * FUNCTION: acpi_remove_gpe_handler
822 *
823 * PARAMETERS: gpe_device - Namespace node for the GPE (NULL for FADT
824 * defined GPEs)
825 * gpe_number - The event to remove a handler
826 * Address - Address of the handler
827 *
828 * RETURN: Status
829 *
830 * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
831 *
832 ******************************************************************************/
833 acpi_status
834 acpi_remove_gpe_handler(acpi_handle gpe_device,
835 u32 gpe_number, acpi_gpe_handler address)
836 {
837 struct acpi_gpe_event_info *gpe_event_info;
838 struct acpi_gpe_handler_info *handler;
839 acpi_status status;
840 acpi_cpu_flags flags;
841
842 ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
843
844 /* Parameter validation */
845
846 if (!address) {
847 return_ACPI_STATUS(AE_BAD_PARAMETER);
848 }
849
850 /* Make sure all deferred tasks are completed */
851
852 acpi_os_wait_events_complete(NULL);
853
854 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
855 if (ACPI_FAILURE(status)) {
856 return_ACPI_STATUS(status);
857 }
858
859 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
860
861 /* Ensure that we have a valid GPE number */
862
863 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
864 if (!gpe_event_info) {
865 status = AE_BAD_PARAMETER;
866 goto unlock_and_exit;
867 }
868
869 /* Make sure that a handler is indeed installed */
870
871 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
872 ACPI_GPE_DISPATCH_HANDLER) {
873 status = AE_NOT_EXIST;
874 goto unlock_and_exit;
875 }
876
877 /* Make sure that the installed handler is the same */
878
879 if (gpe_event_info->dispatch.handler->address != address) {
880 status = AE_BAD_PARAMETER;
881 goto unlock_and_exit;
882 }
883
884 /* Remove the handler */
885
886 handler = gpe_event_info->dispatch.handler;
887
888 /* Restore Method node (if any), set dispatch flags */
889
890 gpe_event_info->dispatch.method_node = handler->method_node;
891 gpe_event_info->flags &=
892 ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
893 gpe_event_info->flags |= handler->original_flags;
894
895 /*
896 * If the GPE was previously associated with a method and it was
897 * enabled, it should be enabled at this point to restore the
898 * post-initialization configuration.
899 */
900
901 if ((handler->original_flags & ACPI_GPE_DISPATCH_METHOD)
902 && handler->originally_enabled)
903 (void)acpi_ev_add_gpe_reference(gpe_event_info);
904
905 /* Now we can free the handler object */
906
907 ACPI_FREE(handler);
908
909 unlock_and_exit:
910 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
911
912 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
913 return_ACPI_STATUS(status);
914 }
915
ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)916 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
917
918 /*******************************************************************************
919 *
920 * FUNCTION: acpi_acquire_global_lock
921 *
922 * PARAMETERS: Timeout - How long the caller is willing to wait
923 * Handle - Where the handle to the lock is returned
924 * (if acquired)
925 *
926 * RETURN: Status
927 *
928 * DESCRIPTION: Acquire the ACPI Global Lock
929 *
930 * Note: Allows callers with the same thread ID to acquire the global lock
931 * multiple times. In other words, externally, the behavior of the global lock
932 * is identical to an AML mutex. On the first acquire, a new handle is
933 * returned. On any subsequent calls to acquire by the same thread, the same
934 * handle is returned.
935 *
936 ******************************************************************************/
937 acpi_status acpi_acquire_global_lock(u16 timeout, u32 * handle)
938 {
939 acpi_status status;
940
941 if (!handle) {
942 return (AE_BAD_PARAMETER);
943 }
944
945 /* Must lock interpreter to prevent race conditions */
946
947 acpi_ex_enter_interpreter();
948
949 status = acpi_ex_acquire_mutex_object(timeout,
950 acpi_gbl_global_lock_mutex,
951 acpi_os_get_thread_id());
952
953 if (ACPI_SUCCESS(status)) {
954
955 /* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
956
957 *handle = acpi_gbl_global_lock_handle;
958 }
959
960 acpi_ex_exit_interpreter();
961 return (status);
962 }
963
ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)964 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
965
966 /*******************************************************************************
967 *
968 * FUNCTION: acpi_release_global_lock
969 *
970 * PARAMETERS: Handle - Returned from acpi_acquire_global_lock
971 *
972 * RETURN: Status
973 *
974 * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
975 *
976 ******************************************************************************/
977 acpi_status acpi_release_global_lock(u32 handle)
978 {
979 acpi_status status;
980
981 if (!handle || (handle != acpi_gbl_global_lock_handle)) {
982 return (AE_NOT_ACQUIRED);
983 }
984
985 status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
986 return (status);
987 }
988
989 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
990 #endif /* !ACPI_REDUCED_HARDWARE */
991