1 /******************************************************************************
2 *
3 * Module Name: evxfgpe - External Interfaces for General Purpose Events (GPEs)
4 *
5 *****************************************************************************/
6
7 /*
8 * Copyright (C) 2000 - 2013, 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 "acevents.h"
48 #include "acnamesp.h"
49
50 #define _COMPONENT ACPI_EVENTS
51 ACPI_MODULE_NAME("evxfgpe")
52
53 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
54 /*******************************************************************************
55 *
56 * FUNCTION: acpi_update_all_gpes
57 *
58 * PARAMETERS: None
59 *
60 * RETURN: Status
61 *
62 * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
63 * associated _Lxx or _Exx methods and are not pointed to by any
64 * device _PRW methods (this indicates that these GPEs are
65 * generally intended for system or device wakeup. Such GPEs
66 * have to be enabled directly when the devices whose _PRW
67 * methods point to them are set up for wakeup signaling.)
68 *
69 * NOTE: Should be called after any GPEs are added to the system. Primarily,
70 * after the system _PRW methods have been run, but also after a GPE Block
71 * Device has been added or if any new GPE methods have been added via a
72 * dynamic table load.
73 *
74 ******************************************************************************/
75
acpi_update_all_gpes(void)76 acpi_status acpi_update_all_gpes(void)
77 {
78 acpi_status status;
79
80 ACPI_FUNCTION_TRACE(acpi_update_all_gpes);
81
82 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
83 if (ACPI_FAILURE(status)) {
84 return_ACPI_STATUS(status);
85 }
86
87 if (acpi_gbl_all_gpes_initialized) {
88 goto unlock_and_exit;
89 }
90
91 status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
92 if (ACPI_SUCCESS(status)) {
93 acpi_gbl_all_gpes_initialized = TRUE;
94 }
95
96 unlock_and_exit:
97 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
98
99 return_ACPI_STATUS(status);
100 }
101
ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)102 ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)
103
104 /*******************************************************************************
105 *
106 * FUNCTION: acpi_enable_gpe
107 *
108 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
109 * gpe_number - GPE level within the GPE block
110 *
111 * RETURN: Status
112 *
113 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
114 * hardware-enabled.
115 *
116 ******************************************************************************/
117
118 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
119 {
120 acpi_status status = AE_BAD_PARAMETER;
121 struct acpi_gpe_event_info *gpe_event_info;
122 acpi_cpu_flags flags;
123
124 ACPI_FUNCTION_TRACE(acpi_enable_gpe);
125
126 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
127
128 /* Ensure that we have a valid GPE number */
129
130 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
131 if (gpe_event_info) {
132 status = acpi_ev_add_gpe_reference(gpe_event_info);
133 }
134
135 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
136 return_ACPI_STATUS(status);
137 }
ACPI_EXPORT_SYMBOL(acpi_enable_gpe)138 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
139
140 /*******************************************************************************
141 *
142 * FUNCTION: acpi_disable_gpe
143 *
144 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
145 * gpe_number - GPE level within the GPE block
146 *
147 * RETURN: Status
148 *
149 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
150 * removed, only then is the GPE disabled (for runtime GPEs), or
151 * the GPE mask bit disabled (for wake GPEs)
152 *
153 ******************************************************************************/
154
155 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
156 {
157 acpi_status status = AE_BAD_PARAMETER;
158 struct acpi_gpe_event_info *gpe_event_info;
159 acpi_cpu_flags flags;
160
161 ACPI_FUNCTION_TRACE(acpi_disable_gpe);
162
163 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
164
165 /* Ensure that we have a valid GPE number */
166
167 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
168 if (gpe_event_info) {
169 status = acpi_ev_remove_gpe_reference(gpe_event_info) ;
170 }
171
172 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
173 return_ACPI_STATUS(status);
174 }
175
ACPI_EXPORT_SYMBOL(acpi_disable_gpe)176 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
177
178
179 /*******************************************************************************
180 *
181 * FUNCTION: acpi_setup_gpe_for_wake
182 *
183 * PARAMETERS: wake_device - Device associated with the GPE (via _PRW)
184 * gpe_device - Parent GPE Device. NULL for GPE0/GPE1
185 * gpe_number - GPE level within the GPE block
186 *
187 * RETURN: Status
188 *
189 * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
190 * interface is intended to be used as the host executes the
191 * _PRW methods (Power Resources for Wake) in the system tables.
192 * Each _PRW appears under a Device Object (The wake_device), and
193 * contains the info for the wake GPE associated with the
194 * wake_device.
195 *
196 ******************************************************************************/
197 acpi_status
198 acpi_setup_gpe_for_wake(acpi_handle wake_device,
199 acpi_handle gpe_device, u32 gpe_number)
200 {
201 acpi_status status;
202 struct acpi_gpe_event_info *gpe_event_info;
203 struct acpi_namespace_node *device_node;
204 struct acpi_gpe_notify_info *notify;
205 struct acpi_gpe_notify_info *new_notify;
206 acpi_cpu_flags flags;
207
208 ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);
209
210 /* Parameter Validation */
211
212 if (!wake_device) {
213 /*
214 * By forcing wake_device to be valid, we automatically enable the
215 * implicit notify feature on all hosts.
216 */
217 return_ACPI_STATUS(AE_BAD_PARAMETER);
218 }
219
220 /* Handle root object case */
221
222 if (wake_device == ACPI_ROOT_OBJECT) {
223 device_node = acpi_gbl_root_node;
224 } else {
225 device_node =
226 ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
227 }
228
229 /* Validate wake_device is of type Device */
230
231 if (device_node->type != ACPI_TYPE_DEVICE) {
232 return_ACPI_STATUS (AE_BAD_PARAMETER);
233 }
234
235 /*
236 * Allocate a new notify object up front, in case it is needed.
237 * Memory allocation while holding a spinlock is a big no-no
238 * on some hosts.
239 */
240 new_notify = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_notify_info));
241 if (!new_notify) {
242 return_ACPI_STATUS(AE_NO_MEMORY);
243 }
244
245 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
246
247 /* Ensure that we have a valid GPE number */
248
249 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
250 if (!gpe_event_info) {
251 status = AE_BAD_PARAMETER;
252 goto unlock_and_exit;
253 }
254
255 /*
256 * If there is no method or handler for this GPE, then the
257 * wake_device will be notified whenever this GPE fires. This is
258 * known as an "implicit notify". Note: The GPE is assumed to be
259 * level-triggered (for windows compatibility).
260 */
261 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
262 ACPI_GPE_DISPATCH_NONE) {
263 /*
264 * This is the first device for implicit notify on this GPE.
265 * Just set the flags here, and enter the NOTIFY block below.
266 */
267 gpe_event_info->flags =
268 (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
269 }
270
271 /*
272 * If we already have an implicit notify on this GPE, add
273 * this device to the notify list.
274 */
275 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
276 ACPI_GPE_DISPATCH_NOTIFY) {
277
278 /* Ensure that the device is not already in the list */
279
280 notify = gpe_event_info->dispatch.notify_list;
281 while (notify) {
282 if (notify->device_node == device_node) {
283 status = AE_ALREADY_EXISTS;
284 goto unlock_and_exit;
285 }
286 notify = notify->next;
287 }
288
289 /* Add this device to the notify list for this GPE */
290
291 new_notify->device_node = device_node;
292 new_notify->next = gpe_event_info->dispatch.notify_list;
293 gpe_event_info->dispatch.notify_list = new_notify;
294 new_notify = NULL;
295 }
296
297 /* Mark the GPE as a possible wake event */
298
299 gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
300 status = AE_OK;
301
302 unlock_and_exit:
303 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
304
305 /* Delete the notify object if it was not used above */
306
307 if (new_notify) {
308 ACPI_FREE(new_notify);
309 }
310 return_ACPI_STATUS(status);
311 }
ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)312 ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)
313
314 /*******************************************************************************
315 *
316 * FUNCTION: acpi_set_gpe_wake_mask
317 *
318 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
319 * gpe_number - GPE level within the GPE block
320 * action - Enable or Disable
321 *
322 * RETURN: Status
323 *
324 * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
325 * already be marked as a WAKE GPE.
326 *
327 ******************************************************************************/
328
329 acpi_status
330 acpi_set_gpe_wake_mask(acpi_handle gpe_device, u32 gpe_number, u8 action)
331 {
332 acpi_status status = AE_OK;
333 struct acpi_gpe_event_info *gpe_event_info;
334 struct acpi_gpe_register_info *gpe_register_info;
335 acpi_cpu_flags flags;
336 u32 register_bit;
337
338 ACPI_FUNCTION_TRACE(acpi_set_gpe_wake_mask);
339
340 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
341
342 /*
343 * Ensure that we have a valid GPE number and that this GPE is in
344 * fact a wake GPE
345 */
346 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
347 if (!gpe_event_info) {
348 status = AE_BAD_PARAMETER;
349 goto unlock_and_exit;
350 }
351
352 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
353 status = AE_TYPE;
354 goto unlock_and_exit;
355 }
356
357 gpe_register_info = gpe_event_info->register_info;
358 if (!gpe_register_info) {
359 status = AE_NOT_EXIST;
360 goto unlock_and_exit;
361 }
362
363 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
364
365 /* Perform the action */
366
367 switch (action) {
368 case ACPI_GPE_ENABLE:
369 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
370 (u8)register_bit);
371 break;
372
373 case ACPI_GPE_DISABLE:
374 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
375 (u8)register_bit);
376 break;
377
378 default:
379 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
380 status = AE_BAD_PARAMETER;
381 break;
382 }
383
384 unlock_and_exit:
385 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
386 return_ACPI_STATUS(status);
387 }
388
ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)389 ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)
390
391 /*******************************************************************************
392 *
393 * FUNCTION: acpi_clear_gpe
394 *
395 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
396 * gpe_number - GPE level within the GPE block
397 *
398 * RETURN: Status
399 *
400 * DESCRIPTION: Clear an ACPI event (general purpose)
401 *
402 ******************************************************************************/
403 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
404 {
405 acpi_status status = AE_OK;
406 struct acpi_gpe_event_info *gpe_event_info;
407 acpi_cpu_flags flags;
408
409 ACPI_FUNCTION_TRACE(acpi_clear_gpe);
410
411 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
412
413 /* Ensure that we have a valid GPE number */
414
415 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
416 if (!gpe_event_info) {
417 status = AE_BAD_PARAMETER;
418 goto unlock_and_exit;
419 }
420
421 status = acpi_hw_clear_gpe(gpe_event_info);
422
423 unlock_and_exit:
424 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
425 return_ACPI_STATUS(status);
426 }
427
ACPI_EXPORT_SYMBOL(acpi_clear_gpe)428 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
429
430 /*******************************************************************************
431 *
432 * FUNCTION: acpi_get_gpe_status
433 *
434 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
435 * gpe_number - GPE level within the GPE block
436 * event_status - Where the current status of the event
437 * will be returned
438 *
439 * RETURN: Status
440 *
441 * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
442 *
443 ******************************************************************************/
444 acpi_status
445 acpi_get_gpe_status(acpi_handle gpe_device,
446 u32 gpe_number, acpi_event_status *event_status)
447 {
448 acpi_status status = AE_OK;
449 struct acpi_gpe_event_info *gpe_event_info;
450 acpi_cpu_flags flags;
451
452 ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
453
454 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
455
456 /* Ensure that we have a valid GPE number */
457
458 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
459 if (!gpe_event_info) {
460 status = AE_BAD_PARAMETER;
461 goto unlock_and_exit;
462 }
463
464 /* Obtain status on the requested GPE number */
465
466 status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
467
468 if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
469 *event_status |= ACPI_EVENT_FLAG_HANDLE;
470
471 unlock_and_exit:
472 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
473 return_ACPI_STATUS(status);
474 }
475
ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)476 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
477
478 /******************************************************************************
479 *
480 * FUNCTION: acpi_disable_all_gpes
481 *
482 * PARAMETERS: None
483 *
484 * RETURN: Status
485 *
486 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
487 *
488 ******************************************************************************/
489
490 acpi_status acpi_disable_all_gpes(void)
491 {
492 acpi_status status;
493
494 ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
495
496 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
497 if (ACPI_FAILURE(status)) {
498 return_ACPI_STATUS(status);
499 }
500
501 status = acpi_hw_disable_all_gpes();
502 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
503
504 return_ACPI_STATUS(status);
505 }
506
ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)507 ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)
508
509 /******************************************************************************
510 *
511 * FUNCTION: acpi_enable_all_runtime_gpes
512 *
513 * PARAMETERS: None
514 *
515 * RETURN: Status
516 *
517 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
518 *
519 ******************************************************************************/
520
521 acpi_status acpi_enable_all_runtime_gpes(void)
522 {
523 acpi_status status;
524
525 ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
526
527 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
528 if (ACPI_FAILURE(status)) {
529 return_ACPI_STATUS(status);
530 }
531
532 status = acpi_hw_enable_all_runtime_gpes();
533 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
534
535 return_ACPI_STATUS(status);
536 }
537
ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)538 ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)
539
540 /*******************************************************************************
541 *
542 * FUNCTION: acpi_install_gpe_block
543 *
544 * PARAMETERS: gpe_device - Handle to the parent GPE Block Device
545 * gpe_block_address - Address and space_ID
546 * register_count - Number of GPE register pairs in the block
547 * interrupt_number - H/W interrupt for the block
548 *
549 * RETURN: Status
550 *
551 * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
552 * enabled here.
553 *
554 ******************************************************************************/
555 acpi_status
556 acpi_install_gpe_block(acpi_handle gpe_device,
557 struct acpi_generic_address *gpe_block_address,
558 u32 register_count, u32 interrupt_number)
559 {
560 acpi_status status;
561 union acpi_operand_object *obj_desc;
562 struct acpi_namespace_node *node;
563 struct acpi_gpe_block_info *gpe_block;
564
565 ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
566
567 if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
568 return_ACPI_STATUS(AE_BAD_PARAMETER);
569 }
570
571 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
572 if (ACPI_FAILURE(status)) {
573 return_ACPI_STATUS(status);
574 }
575
576 node = acpi_ns_validate_handle(gpe_device);
577 if (!node) {
578 status = AE_BAD_PARAMETER;
579 goto unlock_and_exit;
580 }
581
582 /*
583 * For user-installed GPE Block Devices, the gpe_block_base_number
584 * is always zero
585 */
586 status =
587 acpi_ev_create_gpe_block(node, gpe_block_address, register_count, 0,
588 interrupt_number, &gpe_block);
589 if (ACPI_FAILURE(status)) {
590 goto unlock_and_exit;
591 }
592
593 /* Install block in the device_object attached to the node */
594
595 obj_desc = acpi_ns_get_attached_object(node);
596 if (!obj_desc) {
597
598 /*
599 * No object, create a new one (Device nodes do not always have
600 * an attached object)
601 */
602 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
603 if (!obj_desc) {
604 status = AE_NO_MEMORY;
605 goto unlock_and_exit;
606 }
607
608 status =
609 acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
610
611 /* Remove local reference to the object */
612
613 acpi_ut_remove_reference(obj_desc);
614
615 if (ACPI_FAILURE(status)) {
616 goto unlock_and_exit;
617 }
618 }
619
620 /* Now install the GPE block in the device_object */
621
622 obj_desc->device.gpe_block = gpe_block;
623
624 unlock_and_exit:
625 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
626 return_ACPI_STATUS(status);
627 }
628
ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)629 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
630
631 /*******************************************************************************
632 *
633 * FUNCTION: acpi_remove_gpe_block
634 *
635 * PARAMETERS: gpe_device - Handle to the parent GPE Block Device
636 *
637 * RETURN: Status
638 *
639 * DESCRIPTION: Remove a previously installed block of GPE registers
640 *
641 ******************************************************************************/
642 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
643 {
644 union acpi_operand_object *obj_desc;
645 acpi_status status;
646 struct acpi_namespace_node *node;
647
648 ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
649
650 if (!gpe_device) {
651 return_ACPI_STATUS(AE_BAD_PARAMETER);
652 }
653
654 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
655 if (ACPI_FAILURE(status)) {
656 return_ACPI_STATUS(status);
657 }
658
659 node = acpi_ns_validate_handle(gpe_device);
660 if (!node) {
661 status = AE_BAD_PARAMETER;
662 goto unlock_and_exit;
663 }
664
665 /* Get the device_object attached to the node */
666
667 obj_desc = acpi_ns_get_attached_object(node);
668 if (!obj_desc || !obj_desc->device.gpe_block) {
669 return_ACPI_STATUS(AE_NULL_OBJECT);
670 }
671
672 /* Delete the GPE block (but not the device_object) */
673
674 status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
675 if (ACPI_SUCCESS(status)) {
676 obj_desc->device.gpe_block = NULL;
677 }
678
679 unlock_and_exit:
680 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
681 return_ACPI_STATUS(status);
682 }
683
ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)684 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
685
686 /*******************************************************************************
687 *
688 * FUNCTION: acpi_get_gpe_device
689 *
690 * PARAMETERS: index - System GPE index (0-current_gpe_count)
691 * gpe_device - Where the parent GPE Device is returned
692 *
693 * RETURN: Status
694 *
695 * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
696 * gpe device indicates that the gpe number is contained in one of
697 * the FADT-defined gpe blocks. Otherwise, the GPE block device.
698 *
699 ******************************************************************************/
700 acpi_status acpi_get_gpe_device(u32 index, acpi_handle * gpe_device)
701 {
702 struct acpi_gpe_device_info info;
703 acpi_status status;
704
705 ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
706
707 if (!gpe_device) {
708 return_ACPI_STATUS(AE_BAD_PARAMETER);
709 }
710
711 if (index >= acpi_current_gpe_count) {
712 return_ACPI_STATUS(AE_NOT_EXIST);
713 }
714
715 /* Setup and walk the GPE list */
716
717 info.index = index;
718 info.status = AE_NOT_EXIST;
719 info.gpe_device = NULL;
720 info.next_block_base_index = 0;
721
722 status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
723 if (ACPI_FAILURE(status)) {
724 return_ACPI_STATUS(status);
725 }
726
727 *gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
728 return_ACPI_STATUS(info.status);
729 }
730
731 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
732 #endif /* !ACPI_REDUCED_HARDWARE */
733