xref: /openbmc/linux/drivers/acpi/acpica/evxface.c (revision a34a3ed7)
1 /******************************************************************************
2  *
3  * Module Name: evxface - External interfaces for ACPI events
4  *
5  *****************************************************************************/
6 
7 /*
8  * Copyright (C) 2000 - 2018, 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 #define EXPORT_ACPI_INTERFACES
45 
46 #include <acpi/acpi.h>
47 #include "accommon.h"
48 #include "acnamesp.h"
49 #include "acevents.h"
50 #include "acinterp.h"
51 
52 #define _COMPONENT          ACPI_EVENTS
53 ACPI_MODULE_NAME("evxface")
54 #if (!ACPI_REDUCED_HARDWARE)
55 /* Local prototypes */
56 static acpi_status
57 acpi_ev_install_gpe_handler(acpi_handle gpe_device,
58 			    u32 gpe_number,
59 			    u32 type,
60 			    u8 is_raw_handler,
61 			    acpi_gpe_handler address, void *context);
62 
63 #endif
64 
65 
66 /*******************************************************************************
67  *
68  * FUNCTION:    acpi_install_notify_handler
69  *
70  * PARAMETERS:  device          - The device for which notifies will be handled
71  *              handler_type    - The type of handler:
72  *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
73  *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
74  *                                  ACPI_ALL_NOTIFY:    Both System and Device
75  *              handler         - Address of the handler
76  *              context         - Value passed to the handler on each GPE
77  *
78  * RETURN:      Status
79  *
80  * DESCRIPTION: Install a handler for notifications on an ACPI Device,
81  *              thermal_zone, or Processor object.
82  *
83  * NOTES:       The Root namespace object may have only one handler for each
84  *              type of notify (System/Device). Device/Thermal/Processor objects
85  *              may have one device notify handler, and multiple system notify
86  *              handlers.
87  *
88  ******************************************************************************/
89 
90 acpi_status
91 acpi_install_notify_handler(acpi_handle device,
92 			    u32 handler_type,
93 			    acpi_notify_handler handler, void *context)
94 {
95 	struct acpi_namespace_node *node =
96 	    ACPI_CAST_PTR(struct acpi_namespace_node, device);
97 	union acpi_operand_object *obj_desc;
98 	union acpi_operand_object *handler_obj;
99 	acpi_status status;
100 	u32 i;
101 
102 	ACPI_FUNCTION_TRACE(acpi_install_notify_handler);
103 
104 	/* Parameter validation */
105 
106 	if ((!device) || (!handler) || (!handler_type) ||
107 	    (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
108 		return_ACPI_STATUS(AE_BAD_PARAMETER);
109 	}
110 
111 	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
112 	if (ACPI_FAILURE(status)) {
113 		return_ACPI_STATUS(status);
114 	}
115 
116 	/*
117 	 * Root Object:
118 	 * Registering a notify handler on the root object indicates that the
119 	 * caller wishes to receive notifications for all objects. Note that
120 	 * only one global handler can be registered per notify type.
121 	 * Ensure that a handler is not already installed.
122 	 */
123 	if (device == ACPI_ROOT_OBJECT) {
124 		for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
125 			if (handler_type & (i + 1)) {
126 				if (acpi_gbl_global_notify[i].handler) {
127 					status = AE_ALREADY_EXISTS;
128 					goto unlock_and_exit;
129 				}
130 
131 				acpi_gbl_global_notify[i].handler = handler;
132 				acpi_gbl_global_notify[i].context = context;
133 			}
134 		}
135 
136 		goto unlock_and_exit;	/* Global notify handler installed, all done */
137 	}
138 
139 	/*
140 	 * All Other Objects:
141 	 * Caller will only receive notifications specific to the target
142 	 * object. Note that only certain object types are allowed to
143 	 * receive notifications.
144 	 */
145 
146 	/* Are Notifies allowed on this object? */
147 
148 	if (!acpi_ev_is_notify_object(node)) {
149 		status = AE_TYPE;
150 		goto unlock_and_exit;
151 	}
152 
153 	/* Check for an existing internal object, might not exist */
154 
155 	obj_desc = acpi_ns_get_attached_object(node);
156 	if (!obj_desc) {
157 
158 		/* Create a new object */
159 
160 		obj_desc = acpi_ut_create_internal_object(node->type);
161 		if (!obj_desc) {
162 			status = AE_NO_MEMORY;
163 			goto unlock_and_exit;
164 		}
165 
166 		/* Attach new object to the Node, remove local reference */
167 
168 		status = acpi_ns_attach_object(device, obj_desc, node->type);
169 		acpi_ut_remove_reference(obj_desc);
170 		if (ACPI_FAILURE(status)) {
171 			goto unlock_and_exit;
172 		}
173 	}
174 
175 	/* Ensure that the handler is not already installed in the lists */
176 
177 	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
178 		if (handler_type & (i + 1)) {
179 			handler_obj = obj_desc->common_notify.notify_list[i];
180 			while (handler_obj) {
181 				if (handler_obj->notify.handler == handler) {
182 					status = AE_ALREADY_EXISTS;
183 					goto unlock_and_exit;
184 				}
185 
186 				handler_obj = handler_obj->notify.next[i];
187 			}
188 		}
189 	}
190 
191 	/* Create and populate a new notify handler object */
192 
193 	handler_obj = acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_NOTIFY);
194 	if (!handler_obj) {
195 		status = AE_NO_MEMORY;
196 		goto unlock_and_exit;
197 	}
198 
199 	handler_obj->notify.node = node;
200 	handler_obj->notify.handler_type = handler_type;
201 	handler_obj->notify.handler = handler;
202 	handler_obj->notify.context = context;
203 
204 	/* Install the handler at the list head(s) */
205 
206 	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
207 		if (handler_type & (i + 1)) {
208 			handler_obj->notify.next[i] =
209 			    obj_desc->common_notify.notify_list[i];
210 
211 			obj_desc->common_notify.notify_list[i] = handler_obj;
212 		}
213 	}
214 
215 	/* Add an extra reference if handler was installed in both lists */
216 
217 	if (handler_type == ACPI_ALL_NOTIFY) {
218 		acpi_ut_add_reference(handler_obj);
219 	}
220 
221 unlock_and_exit:
222 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
223 	return_ACPI_STATUS(status);
224 }
225 
226 ACPI_EXPORT_SYMBOL(acpi_install_notify_handler)
227 
228 /*******************************************************************************
229  *
230  * FUNCTION:    acpi_remove_notify_handler
231  *
232  * PARAMETERS:  device          - The device for which the handler is installed
233  *              handler_type    - The type of handler:
234  *                                  ACPI_SYSTEM_NOTIFY: System Handler (00-7F)
235  *                                  ACPI_DEVICE_NOTIFY: Device Handler (80-FF)
236  *                                  ACPI_ALL_NOTIFY:    Both System and Device
237  *              handler         - Address of the handler
238  *
239  * RETURN:      Status
240  *
241  * DESCRIPTION: Remove a handler for notifies on an ACPI device
242  *
243  ******************************************************************************/
244 acpi_status
245 acpi_remove_notify_handler(acpi_handle device,
246 			   u32 handler_type, acpi_notify_handler handler)
247 {
248 	struct acpi_namespace_node *node =
249 	    ACPI_CAST_PTR(struct acpi_namespace_node, device);
250 	union acpi_operand_object *obj_desc;
251 	union acpi_operand_object *handler_obj;
252 	union acpi_operand_object *previous_handler_obj;
253 	acpi_status status = AE_OK;
254 	u32 i;
255 
256 	ACPI_FUNCTION_TRACE(acpi_remove_notify_handler);
257 
258 	/* Parameter validation */
259 
260 	if ((!device) || (!handler) || (!handler_type) ||
261 	    (handler_type > ACPI_MAX_NOTIFY_HANDLER_TYPE)) {
262 		return_ACPI_STATUS(AE_BAD_PARAMETER);
263 	}
264 
265 	/* Root Object. Global handlers are removed here */
266 
267 	if (device == ACPI_ROOT_OBJECT) {
268 		for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
269 			if (handler_type & (i + 1)) {
270 				status =
271 				    acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
272 				if (ACPI_FAILURE(status)) {
273 					return_ACPI_STATUS(status);
274 				}
275 
276 				if (!acpi_gbl_global_notify[i].handler ||
277 				    (acpi_gbl_global_notify[i].handler !=
278 				     handler)) {
279 					status = AE_NOT_EXIST;
280 					goto unlock_and_exit;
281 				}
282 
283 				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
284 						  "Removing global notify handler\n"));
285 
286 				acpi_gbl_global_notify[i].handler = NULL;
287 				acpi_gbl_global_notify[i].context = NULL;
288 
289 				(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
290 
291 				/* Make sure all deferred notify tasks are completed */
292 
293 				acpi_os_wait_events_complete();
294 			}
295 		}
296 
297 		return_ACPI_STATUS(AE_OK);
298 	}
299 
300 	/* All other objects: Are Notifies allowed on this object? */
301 
302 	if (!acpi_ev_is_notify_object(node)) {
303 		return_ACPI_STATUS(AE_TYPE);
304 	}
305 
306 	/* Must have an existing internal object */
307 
308 	obj_desc = acpi_ns_get_attached_object(node);
309 	if (!obj_desc) {
310 		return_ACPI_STATUS(AE_NOT_EXIST);
311 	}
312 
313 	/* Internal object exists. Find the handler and remove it */
314 
315 	for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) {
316 		if (handler_type & (i + 1)) {
317 			status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
318 			if (ACPI_FAILURE(status)) {
319 				return_ACPI_STATUS(status);
320 			}
321 
322 			handler_obj = obj_desc->common_notify.notify_list[i];
323 			previous_handler_obj = NULL;
324 
325 			/* Attempt to find the handler in the handler list */
326 
327 			while (handler_obj &&
328 			       (handler_obj->notify.handler != handler)) {
329 				previous_handler_obj = handler_obj;
330 				handler_obj = handler_obj->notify.next[i];
331 			}
332 
333 			if (!handler_obj) {
334 				status = AE_NOT_EXIST;
335 				goto unlock_and_exit;
336 			}
337 
338 			/* Remove the handler object from the list */
339 
340 			if (previous_handler_obj) {	/* Handler is not at the list head */
341 				previous_handler_obj->notify.next[i] =
342 				    handler_obj->notify.next[i];
343 			} else {	/* Handler is at the list head */
344 
345 				obj_desc->common_notify.notify_list[i] =
346 				    handler_obj->notify.next[i];
347 			}
348 
349 			(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
350 
351 			/* Make sure all deferred notify tasks are completed */
352 
353 			acpi_os_wait_events_complete();
354 			acpi_ut_remove_reference(handler_obj);
355 		}
356 	}
357 
358 	return_ACPI_STATUS(status);
359 
360 unlock_and_exit:
361 	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
362 	return_ACPI_STATUS(status);
363 }
364 
365 ACPI_EXPORT_SYMBOL(acpi_remove_notify_handler)
366 
367 /*******************************************************************************
368  *
369  * FUNCTION:    acpi_install_exception_handler
370  *
371  * PARAMETERS:  handler         - Pointer to the handler function for the
372  *                                event
373  *
374  * RETURN:      Status
375  *
376  * DESCRIPTION: Saves the pointer to the handler function
377  *
378  ******************************************************************************/
379 #ifdef ACPI_FUTURE_USAGE
380 acpi_status acpi_install_exception_handler(acpi_exception_handler handler)
381 {
382 	acpi_status status;
383 
384 	ACPI_FUNCTION_TRACE(acpi_install_exception_handler);
385 
386 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
387 	if (ACPI_FAILURE(status)) {
388 		return_ACPI_STATUS(status);
389 	}
390 
391 	/* Don't allow two handlers. */
392 
393 	if (acpi_gbl_exception_handler) {
394 		status = AE_ALREADY_EXISTS;
395 		goto cleanup;
396 	}
397 
398 	/* Install the handler */
399 
400 	acpi_gbl_exception_handler = handler;
401 
402 cleanup:
403 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
404 	return_ACPI_STATUS(status);
405 }
406 
407 ACPI_EXPORT_SYMBOL(acpi_install_exception_handler)
408 #endif
409 
410 #if (!ACPI_REDUCED_HARDWARE)
411 /*******************************************************************************
412  *
413  * FUNCTION:    acpi_install_sci_handler
414  *
415  * PARAMETERS:  address             - Address of the handler
416  *              context             - Value passed to the handler on each SCI
417  *
418  * RETURN:      Status
419  *
420  * DESCRIPTION: Install a handler for a System Control Interrupt.
421  *
422  ******************************************************************************/
423 acpi_status acpi_install_sci_handler(acpi_sci_handler address, void *context)
424 {
425 	struct acpi_sci_handler_info *new_sci_handler;
426 	struct acpi_sci_handler_info *sci_handler;
427 	acpi_cpu_flags flags;
428 	acpi_status status;
429 
430 	ACPI_FUNCTION_TRACE(acpi_install_sci_handler);
431 
432 	if (!address) {
433 		return_ACPI_STATUS(AE_BAD_PARAMETER);
434 	}
435 
436 	/* Allocate and init a handler object */
437 
438 	new_sci_handler = ACPI_ALLOCATE(sizeof(struct acpi_sci_handler_info));
439 	if (!new_sci_handler) {
440 		return_ACPI_STATUS(AE_NO_MEMORY);
441 	}
442 
443 	new_sci_handler->address = address;
444 	new_sci_handler->context = context;
445 
446 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
447 	if (ACPI_FAILURE(status)) {
448 		goto exit;
449 	}
450 
451 	/* Lock list during installation */
452 
453 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
454 	sci_handler = acpi_gbl_sci_handler_list;
455 
456 	/* Ensure handler does not already exist */
457 
458 	while (sci_handler) {
459 		if (address == sci_handler->address) {
460 			status = AE_ALREADY_EXISTS;
461 			goto unlock_and_exit;
462 		}
463 
464 		sci_handler = sci_handler->next;
465 	}
466 
467 	/* Install the new handler into the global list (at head) */
468 
469 	new_sci_handler->next = acpi_gbl_sci_handler_list;
470 	acpi_gbl_sci_handler_list = new_sci_handler;
471 
472 unlock_and_exit:
473 
474 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
475 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
476 
477 exit:
478 	if (ACPI_FAILURE(status)) {
479 		ACPI_FREE(new_sci_handler);
480 	}
481 	return_ACPI_STATUS(status);
482 }
483 
484 ACPI_EXPORT_SYMBOL(acpi_install_sci_handler)
485 
486 /*******************************************************************************
487  *
488  * FUNCTION:    acpi_remove_sci_handler
489  *
490  * PARAMETERS:  address             - Address of the handler
491  *
492  * RETURN:      Status
493  *
494  * DESCRIPTION: Remove a handler for a System Control Interrupt.
495  *
496  ******************************************************************************/
497 acpi_status acpi_remove_sci_handler(acpi_sci_handler address)
498 {
499 	struct acpi_sci_handler_info *prev_sci_handler;
500 	struct acpi_sci_handler_info *next_sci_handler;
501 	acpi_cpu_flags flags;
502 	acpi_status status;
503 
504 	ACPI_FUNCTION_TRACE(acpi_remove_sci_handler);
505 
506 	if (!address) {
507 		return_ACPI_STATUS(AE_BAD_PARAMETER);
508 	}
509 
510 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
511 	if (ACPI_FAILURE(status)) {
512 		return_ACPI_STATUS(status);
513 	}
514 
515 	/* Remove the SCI handler with lock */
516 
517 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
518 
519 	prev_sci_handler = NULL;
520 	next_sci_handler = acpi_gbl_sci_handler_list;
521 	while (next_sci_handler) {
522 		if (next_sci_handler->address == address) {
523 
524 			/* Unlink and free the SCI handler info block */
525 
526 			if (prev_sci_handler) {
527 				prev_sci_handler->next = next_sci_handler->next;
528 			} else {
529 				acpi_gbl_sci_handler_list =
530 				    next_sci_handler->next;
531 			}
532 
533 			acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
534 			ACPI_FREE(next_sci_handler);
535 			goto unlock_and_exit;
536 		}
537 
538 		prev_sci_handler = next_sci_handler;
539 		next_sci_handler = next_sci_handler->next;
540 	}
541 
542 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
543 	status = AE_NOT_EXIST;
544 
545 unlock_and_exit:
546 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
547 	return_ACPI_STATUS(status);
548 }
549 
550 ACPI_EXPORT_SYMBOL(acpi_remove_sci_handler)
551 
552 /*******************************************************************************
553  *
554  * FUNCTION:    acpi_install_global_event_handler
555  *
556  * PARAMETERS:  handler         - Pointer to the global event handler function
557  *              context         - Value passed to the handler on each event
558  *
559  * RETURN:      Status
560  *
561  * DESCRIPTION: Saves the pointer to the handler function. The global handler
562  *              is invoked upon each incoming GPE and Fixed Event. It is
563  *              invoked at interrupt level at the time of the event dispatch.
564  *              Can be used to update event counters, etc.
565  *
566  ******************************************************************************/
567 acpi_status
568 acpi_install_global_event_handler(acpi_gbl_event_handler handler, void *context)
569 {
570 	acpi_status status;
571 
572 	ACPI_FUNCTION_TRACE(acpi_install_global_event_handler);
573 
574 	/* Parameter validation */
575 
576 	if (!handler) {
577 		return_ACPI_STATUS(AE_BAD_PARAMETER);
578 	}
579 
580 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
581 	if (ACPI_FAILURE(status)) {
582 		return_ACPI_STATUS(status);
583 	}
584 
585 	/* Don't allow two handlers. */
586 
587 	if (acpi_gbl_global_event_handler) {
588 		status = AE_ALREADY_EXISTS;
589 		goto cleanup;
590 	}
591 
592 	acpi_gbl_global_event_handler = handler;
593 	acpi_gbl_global_event_handler_context = context;
594 
595 cleanup:
596 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
597 	return_ACPI_STATUS(status);
598 }
599 
600 ACPI_EXPORT_SYMBOL(acpi_install_global_event_handler)
601 
602 /*******************************************************************************
603  *
604  * FUNCTION:    acpi_install_fixed_event_handler
605  *
606  * PARAMETERS:  event           - Event type to enable.
607  *              handler         - Pointer to the handler function for the
608  *                                event
609  *              context         - Value passed to the handler on each GPE
610  *
611  * RETURN:      Status
612  *
613  * DESCRIPTION: Saves the pointer to the handler function and then enables the
614  *              event.
615  *
616  ******************************************************************************/
617 acpi_status
618 acpi_install_fixed_event_handler(u32 event,
619 				 acpi_event_handler handler, void *context)
620 {
621 	acpi_status status;
622 
623 	ACPI_FUNCTION_TRACE(acpi_install_fixed_event_handler);
624 
625 	/* Parameter validation */
626 
627 	if (event > ACPI_EVENT_MAX) {
628 		return_ACPI_STATUS(AE_BAD_PARAMETER);
629 	}
630 
631 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
632 	if (ACPI_FAILURE(status)) {
633 		return_ACPI_STATUS(status);
634 	}
635 
636 	/* Do not allow multiple handlers */
637 
638 	if (acpi_gbl_fixed_event_handlers[event].handler) {
639 		status = AE_ALREADY_EXISTS;
640 		goto cleanup;
641 	}
642 
643 	/* Install the handler before enabling the event */
644 
645 	acpi_gbl_fixed_event_handlers[event].handler = handler;
646 	acpi_gbl_fixed_event_handlers[event].context = context;
647 
648 	status = acpi_clear_event(event);
649 	if (ACPI_SUCCESS(status))
650 		status = acpi_enable_event(event, 0);
651 	if (ACPI_FAILURE(status)) {
652 		ACPI_WARNING((AE_INFO,
653 			      "Could not enable fixed event - %s (%u)",
654 			      acpi_ut_get_event_name(event), event));
655 
656 		/* Remove the handler */
657 
658 		acpi_gbl_fixed_event_handlers[event].handler = NULL;
659 		acpi_gbl_fixed_event_handlers[event].context = NULL;
660 	} else {
661 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
662 				  "Enabled fixed event %s (%X), Handler=%p\n",
663 				  acpi_ut_get_event_name(event), event,
664 				  handler));
665 	}
666 
667 cleanup:
668 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
669 	return_ACPI_STATUS(status);
670 }
671 
672 ACPI_EXPORT_SYMBOL(acpi_install_fixed_event_handler)
673 
674 /*******************************************************************************
675  *
676  * FUNCTION:    acpi_remove_fixed_event_handler
677  *
678  * PARAMETERS:  event           - Event type to disable.
679  *              handler         - Address of the handler
680  *
681  * RETURN:      Status
682  *
683  * DESCRIPTION: Disables the event and unregisters the event handler.
684  *
685  ******************************************************************************/
686 acpi_status
687 acpi_remove_fixed_event_handler(u32 event, acpi_event_handler handler)
688 {
689 	acpi_status status = AE_OK;
690 
691 	ACPI_FUNCTION_TRACE(acpi_remove_fixed_event_handler);
692 
693 	/* Parameter validation */
694 
695 	if (event > ACPI_EVENT_MAX) {
696 		return_ACPI_STATUS(AE_BAD_PARAMETER);
697 	}
698 
699 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
700 	if (ACPI_FAILURE(status)) {
701 		return_ACPI_STATUS(status);
702 	}
703 
704 	/* Disable the event before removing the handler */
705 
706 	status = acpi_disable_event(event, 0);
707 
708 	/* Always Remove the handler */
709 
710 	acpi_gbl_fixed_event_handlers[event].handler = NULL;
711 	acpi_gbl_fixed_event_handlers[event].context = NULL;
712 
713 	if (ACPI_FAILURE(status)) {
714 		ACPI_WARNING((AE_INFO,
715 			      "Could not disable fixed event - %s (%u)",
716 			      acpi_ut_get_event_name(event), event));
717 	} else {
718 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
719 				  "Disabled fixed event - %s (%X)\n",
720 				  acpi_ut_get_event_name(event), event));
721 	}
722 
723 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
724 	return_ACPI_STATUS(status);
725 }
726 
727 ACPI_EXPORT_SYMBOL(acpi_remove_fixed_event_handler)
728 
729 /*******************************************************************************
730  *
731  * FUNCTION:    acpi_ev_install_gpe_handler
732  *
733  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
734  *                                defined GPEs)
735  *              gpe_number      - The GPE number within the GPE block
736  *              type            - Whether this GPE should be treated as an
737  *                                edge- or level-triggered interrupt.
738  *              is_raw_handler  - Whether this GPE should be handled using
739  *                                the special GPE handler mode.
740  *              address         - Address of the handler
741  *              context         - Value passed to the handler on each GPE
742  *
743  * RETURN:      Status
744  *
745  * DESCRIPTION: Internal function to install a handler for a General Purpose
746  *              Event.
747  *
748  ******************************************************************************/
749 static acpi_status
750 acpi_ev_install_gpe_handler(acpi_handle gpe_device,
751 			    u32 gpe_number,
752 			    u32 type,
753 			    u8 is_raw_handler,
754 			    acpi_gpe_handler address, void *context)
755 {
756 	struct acpi_gpe_event_info *gpe_event_info;
757 	struct acpi_gpe_handler_info *handler;
758 	acpi_status status;
759 	acpi_cpu_flags flags;
760 
761 	ACPI_FUNCTION_TRACE(ev_install_gpe_handler);
762 
763 	/* Parameter validation */
764 
765 	if ((!address) || (type & ~ACPI_GPE_XRUPT_TYPE_MASK)) {
766 		return_ACPI_STATUS(AE_BAD_PARAMETER);
767 	}
768 
769 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
770 	if (ACPI_FAILURE(status)) {
771 		return_ACPI_STATUS(status);
772 	}
773 
774 	/* Allocate and init handler object (before lock) */
775 
776 	handler = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_handler_info));
777 	if (!handler) {
778 		status = AE_NO_MEMORY;
779 		goto unlock_and_exit;
780 	}
781 
782 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
783 
784 	/* Ensure that we have a valid GPE number */
785 
786 	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
787 	if (!gpe_event_info) {
788 		status = AE_BAD_PARAMETER;
789 		goto free_and_exit;
790 	}
791 
792 	/* Make sure that there isn't a handler there already */
793 
794 	if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
795 	     ACPI_GPE_DISPATCH_HANDLER) ||
796 	    (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
797 	     ACPI_GPE_DISPATCH_RAW_HANDLER)) {
798 		status = AE_ALREADY_EXISTS;
799 		goto free_and_exit;
800 	}
801 
802 	handler->address = address;
803 	handler->context = context;
804 	handler->method_node = gpe_event_info->dispatch.method_node;
805 	handler->original_flags = (u8)(gpe_event_info->flags &
806 				       (ACPI_GPE_XRUPT_TYPE_MASK |
807 					ACPI_GPE_DISPATCH_MASK));
808 
809 	/*
810 	 * If the GPE is associated with a method, it may have been enabled
811 	 * automatically during initialization, in which case it has to be
812 	 * disabled now to avoid spurious execution of the handler.
813 	 */
814 	if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
815 	      ACPI_GPE_DISPATCH_METHOD) ||
816 	     (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
817 	      ACPI_GPE_DISPATCH_NOTIFY)) && gpe_event_info->runtime_count) {
818 		handler->originally_enabled = TRUE;
819 		(void)acpi_ev_remove_gpe_reference(gpe_event_info);
820 
821 		/* Sanity check of original type against new type */
822 
823 		if (type !=
824 		    (u32)(gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
825 			ACPI_WARNING((AE_INFO,
826 				      "GPE type mismatch (level/edge)"));
827 		}
828 	}
829 
830 	/* Install the handler */
831 
832 	gpe_event_info->dispatch.handler = handler;
833 
834 	/* Setup up dispatch flags to indicate handler (vs. method/notify) */
835 
836 	gpe_event_info->flags &=
837 	    ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
838 	gpe_event_info->flags |=
839 	    (u8)(type |
840 		 (is_raw_handler ? ACPI_GPE_DISPATCH_RAW_HANDLER :
841 		  ACPI_GPE_DISPATCH_HANDLER));
842 
843 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
844 
845 unlock_and_exit:
846 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
847 	return_ACPI_STATUS(status);
848 
849 free_and_exit:
850 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
851 	ACPI_FREE(handler);
852 	goto unlock_and_exit;
853 }
854 
855 /*******************************************************************************
856  *
857  * FUNCTION:    acpi_install_gpe_handler
858  *
859  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
860  *                                defined GPEs)
861  *              gpe_number      - The GPE number within the GPE block
862  *              type            - Whether this GPE should be treated as an
863  *                                edge- or level-triggered interrupt.
864  *              address         - Address of the handler
865  *              context         - Value passed to the handler on each GPE
866  *
867  * RETURN:      Status
868  *
869  * DESCRIPTION: Install a handler for a General Purpose Event.
870  *
871  ******************************************************************************/
872 
873 acpi_status
874 acpi_install_gpe_handler(acpi_handle gpe_device,
875 			 u32 gpe_number,
876 			 u32 type, acpi_gpe_handler address, void *context)
877 {
878 	acpi_status status;
879 
880 	ACPI_FUNCTION_TRACE(acpi_install_gpe_handler);
881 
882 	status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type,
883 					     FALSE, address, context);
884 
885 	return_ACPI_STATUS(status);
886 }
887 
888 ACPI_EXPORT_SYMBOL(acpi_install_gpe_handler)
889 
890 /*******************************************************************************
891  *
892  * FUNCTION:    acpi_install_gpe_raw_handler
893  *
894  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
895  *                                defined GPEs)
896  *              gpe_number      - The GPE number within the GPE block
897  *              type            - Whether this GPE should be treated as an
898  *                                edge- or level-triggered interrupt.
899  *              address         - Address of the handler
900  *              context         - Value passed to the handler on each GPE
901  *
902  * RETURN:      Status
903  *
904  * DESCRIPTION: Install a handler for a General Purpose Event.
905  *
906  ******************************************************************************/
907 acpi_status
908 acpi_install_gpe_raw_handler(acpi_handle gpe_device,
909 			     u32 gpe_number,
910 			     u32 type, acpi_gpe_handler address, void *context)
911 {
912 	acpi_status status;
913 
914 	ACPI_FUNCTION_TRACE(acpi_install_gpe_raw_handler);
915 
916 	status = acpi_ev_install_gpe_handler(gpe_device, gpe_number, type,
917 					     TRUE, address, context);
918 
919 	return_ACPI_STATUS(status);
920 }
921 
922 ACPI_EXPORT_SYMBOL(acpi_install_gpe_raw_handler)
923 
924 /*******************************************************************************
925  *
926  * FUNCTION:    acpi_remove_gpe_handler
927  *
928  * PARAMETERS:  gpe_device      - Namespace node for the GPE (NULL for FADT
929  *                                defined GPEs)
930  *              gpe_number      - The event to remove a handler
931  *              address         - Address of the handler
932  *
933  * RETURN:      Status
934  *
935  * DESCRIPTION: Remove a handler for a General Purpose acpi_event.
936  *
937  ******************************************************************************/
938 acpi_status
939 acpi_remove_gpe_handler(acpi_handle gpe_device,
940 			u32 gpe_number, acpi_gpe_handler address)
941 {
942 	struct acpi_gpe_event_info *gpe_event_info;
943 	struct acpi_gpe_handler_info *handler;
944 	acpi_status status;
945 	acpi_cpu_flags flags;
946 
947 	ACPI_FUNCTION_TRACE(acpi_remove_gpe_handler);
948 
949 	/* Parameter validation */
950 
951 	if (!address) {
952 		return_ACPI_STATUS(AE_BAD_PARAMETER);
953 	}
954 
955 	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
956 	if (ACPI_FAILURE(status)) {
957 		return_ACPI_STATUS(status);
958 	}
959 
960 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
961 
962 	/* Ensure that we have a valid GPE number */
963 
964 	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
965 	if (!gpe_event_info) {
966 		status = AE_BAD_PARAMETER;
967 		goto unlock_and_exit;
968 	}
969 
970 	/* Make sure that a handler is indeed installed */
971 
972 	if ((ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
973 	     ACPI_GPE_DISPATCH_HANDLER) &&
974 	    (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
975 	     ACPI_GPE_DISPATCH_RAW_HANDLER)) {
976 		status = AE_NOT_EXIST;
977 		goto unlock_and_exit;
978 	}
979 
980 	/* Make sure that the installed handler is the same */
981 
982 	if (gpe_event_info->dispatch.handler->address != address) {
983 		status = AE_BAD_PARAMETER;
984 		goto unlock_and_exit;
985 	}
986 
987 	/* Remove the handler */
988 
989 	handler = gpe_event_info->dispatch.handler;
990 	gpe_event_info->dispatch.handler = NULL;
991 
992 	/* Restore Method node (if any), set dispatch flags */
993 
994 	gpe_event_info->dispatch.method_node = handler->method_node;
995 	gpe_event_info->flags &=
996 	    ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
997 	gpe_event_info->flags |= handler->original_flags;
998 
999 	/*
1000 	 * If the GPE was previously associated with a method and it was
1001 	 * enabled, it should be enabled at this point to restore the
1002 	 * post-initialization configuration.
1003 	 */
1004 	if (((ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
1005 	      ACPI_GPE_DISPATCH_METHOD) ||
1006 	     (ACPI_GPE_DISPATCH_TYPE(handler->original_flags) ==
1007 	      ACPI_GPE_DISPATCH_NOTIFY)) && handler->originally_enabled) {
1008 		(void)acpi_ev_add_gpe_reference(gpe_event_info);
1009 	}
1010 
1011 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
1012 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
1013 
1014 	/* Make sure all deferred GPE tasks are completed */
1015 
1016 	acpi_os_wait_events_complete();
1017 
1018 	/* Now we can free the handler object */
1019 
1020 	ACPI_FREE(handler);
1021 	return_ACPI_STATUS(status);
1022 
1023 unlock_and_exit:
1024 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
1025 
1026 	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
1027 	return_ACPI_STATUS(status);
1028 }
1029 
1030 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_handler)
1031 
1032 /*******************************************************************************
1033  *
1034  * FUNCTION:    acpi_acquire_global_lock
1035  *
1036  * PARAMETERS:  timeout         - How long the caller is willing to wait
1037  *              handle          - Where the handle to the lock is returned
1038  *                                (if acquired)
1039  *
1040  * RETURN:      Status
1041  *
1042  * DESCRIPTION: Acquire the ACPI Global Lock
1043  *
1044  * Note: Allows callers with the same thread ID to acquire the global lock
1045  * multiple times. In other words, externally, the behavior of the global lock
1046  * is identical to an AML mutex. On the first acquire, a new handle is
1047  * returned. On any subsequent calls to acquire by the same thread, the same
1048  * handle is returned.
1049  *
1050  ******************************************************************************/
1051 acpi_status acpi_acquire_global_lock(u16 timeout, u32 *handle)
1052 {
1053 	acpi_status status;
1054 
1055 	if (!handle) {
1056 		return (AE_BAD_PARAMETER);
1057 	}
1058 
1059 	/* Must lock interpreter to prevent race conditions */
1060 
1061 	acpi_ex_enter_interpreter();
1062 
1063 	status = acpi_ex_acquire_mutex_object(timeout,
1064 					      acpi_gbl_global_lock_mutex,
1065 					      acpi_os_get_thread_id());
1066 
1067 	if (ACPI_SUCCESS(status)) {
1068 
1069 		/* Return the global lock handle (updated in acpi_ev_acquire_global_lock) */
1070 
1071 		*handle = acpi_gbl_global_lock_handle;
1072 	}
1073 
1074 	acpi_ex_exit_interpreter();
1075 	return (status);
1076 }
1077 
1078 ACPI_EXPORT_SYMBOL(acpi_acquire_global_lock)
1079 
1080 /*******************************************************************************
1081  *
1082  * FUNCTION:    acpi_release_global_lock
1083  *
1084  * PARAMETERS:  handle      - Returned from acpi_acquire_global_lock
1085  *
1086  * RETURN:      Status
1087  *
1088  * DESCRIPTION: Release the ACPI Global Lock. The handle must be valid.
1089  *
1090  ******************************************************************************/
1091 acpi_status acpi_release_global_lock(u32 handle)
1092 {
1093 	acpi_status status;
1094 
1095 	if (!handle || (handle != acpi_gbl_global_lock_handle)) {
1096 		return (AE_NOT_ACQUIRED);
1097 	}
1098 
1099 	status = acpi_ex_release_mutex_object(acpi_gbl_global_lock_mutex);
1100 	return (status);
1101 }
1102 
1103 ACPI_EXPORT_SYMBOL(acpi_release_global_lock)
1104 #endif				/* !ACPI_REDUCED_HARDWARE */
1105