1 /******************************************************************************
3 * Module Name: evxfgpe - External Interfaces for General Purpose Events (GPEs)
5 *****************************************************************************/
8 * Copyright (C) 2000 - 2014, Intel Corp.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
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.
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.
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
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41 * POSSIBILITY OF SUCH DAMAGES.
44 #define EXPORT_ACPI_INTERFACES
46 #include <acpi/acpi.h>
51 #define _COMPONENT ACPI_EVENTS
52 ACPI_MODULE_NAME("evxfgpe")
54 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
55 /*******************************************************************************
57 * FUNCTION: acpi_update_all_gpes
63 * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
64 * associated _Lxx or _Exx methods and are not pointed to by any
65 * device _PRW methods (this indicates that these GPEs are
66 * generally intended for system or device wakeup. Such GPEs
67 * have to be enabled directly when the devices whose _PRW
68 * methods point to them are set up for wakeup signaling.)
70 * NOTE: Should be called after any GPEs are added to the system. Primarily,
71 * after the system _PRW methods have been run, but also after a GPE Block
72 * Device has been added or if any new GPE methods have been added via a
75 ******************************************************************************/
77 acpi_status acpi_update_all_gpes(void)
81 ACPI_FUNCTION_TRACE(acpi_update_all_gpes);
83 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
84 if (ACPI_FAILURE(status)) {
85 return_ACPI_STATUS(status);
88 if (acpi_gbl_all_gpes_initialized) {
92 status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block, NULL);
93 if (ACPI_SUCCESS(status)) {
94 acpi_gbl_all_gpes_initialized = TRUE;
98 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
100 return_ACPI_STATUS(status);
103 ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)
105 /*******************************************************************************
107 * FUNCTION: acpi_enable_gpe
109 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
110 * gpe_number - GPE level within the GPE block
114 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
117 ******************************************************************************/
119 acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
121 acpi_status status = AE_BAD_PARAMETER;
122 struct acpi_gpe_event_info *gpe_event_info;
123 acpi_cpu_flags flags;
125 ACPI_FUNCTION_TRACE(acpi_enable_gpe);
127 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
130 * Ensure that we have a valid GPE number and that there is some way
131 * of handling the GPE (handler or a GPE method). In other words, we
132 * won't allow a valid GPE to be enabled if there is no way to handle it.
134 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
135 if (gpe_event_info) {
136 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) !=
137 ACPI_GPE_DISPATCH_NONE) {
138 status = acpi_ev_add_gpe_reference(gpe_event_info);
140 status = AE_NO_HANDLER;
144 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
145 return_ACPI_STATUS(status);
147 ACPI_EXPORT_SYMBOL(acpi_enable_gpe)
149 /*******************************************************************************
151 * FUNCTION: acpi_disable_gpe
153 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
154 * gpe_number - GPE level within the GPE block
158 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
159 * removed, only then is the GPE disabled (for runtime GPEs), or
160 * the GPE mask bit disabled (for wake GPEs)
162 ******************************************************************************/
164 acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
166 acpi_status status = AE_BAD_PARAMETER;
167 struct acpi_gpe_event_info *gpe_event_info;
168 acpi_cpu_flags flags;
170 ACPI_FUNCTION_TRACE(acpi_disable_gpe);
172 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
174 /* Ensure that we have a valid GPE number */
176 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
177 if (gpe_event_info) {
178 status = acpi_ev_remove_gpe_reference(gpe_event_info) ;
181 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
182 return_ACPI_STATUS(status);
185 ACPI_EXPORT_SYMBOL(acpi_disable_gpe)
188 /*******************************************************************************
190 * FUNCTION: acpi_mark_gpe_for_wake
192 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
193 * gpe_number - GPE level within the GPE block
197 * DESCRIPTION: Mark a GPE as having the ability to wake the system. Simply
198 * sets the ACPI_GPE_CAN_WAKE flag.
200 * Some potential callers of acpi_setup_gpe_for_wake may know in advance that
201 * there won't be any notify handlers installed for device wake notifications
202 * from the given GPE (one example is a button GPE in Linux). For these cases,
203 * acpi_mark_gpe_for_wake should be used instead of acpi_setup_gpe_for_wake.
204 * This will set the ACPI_GPE_CAN_WAKE flag for the GPE without trying to
205 * setup implicit wake notification for it (since there's no handler method).
207 ******************************************************************************/
208 acpi_status acpi_mark_gpe_for_wake(acpi_handle gpe_device, u32 gpe_number)
210 struct acpi_gpe_event_info *gpe_event_info;
211 acpi_status status = AE_BAD_PARAMETER;
212 acpi_cpu_flags flags;
214 ACPI_FUNCTION_TRACE(acpi_mark_gpe_for_wake);
216 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
218 /* Ensure that we have a valid GPE number */
220 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
221 if (gpe_event_info) {
223 /* Mark the GPE as a possible wake event */
225 gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
229 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
230 return_ACPI_STATUS(status);
233 ACPI_EXPORT_SYMBOL(acpi_mark_gpe_for_wake)
235 /*******************************************************************************
237 * FUNCTION: acpi_setup_gpe_for_wake
239 * PARAMETERS: wake_device - Device associated with the GPE (via _PRW)
240 * gpe_device - Parent GPE Device. NULL for GPE0/GPE1
241 * gpe_number - GPE level within the GPE block
245 * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
246 * interface is intended to be used as the host executes the
247 * _PRW methods (Power Resources for Wake) in the system tables.
248 * Each _PRW appears under a Device Object (The wake_device), and
249 * contains the info for the wake GPE associated with the
252 ******************************************************************************/
254 acpi_setup_gpe_for_wake(acpi_handle wake_device,
255 acpi_handle gpe_device, u32 gpe_number)
258 struct acpi_gpe_event_info *gpe_event_info;
259 struct acpi_namespace_node *device_node;
260 struct acpi_gpe_notify_info *notify;
261 struct acpi_gpe_notify_info *new_notify;
262 acpi_cpu_flags flags;
264 ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);
266 /* Parameter Validation */
270 * By forcing wake_device to be valid, we automatically enable the
271 * implicit notify feature on all hosts.
273 return_ACPI_STATUS(AE_BAD_PARAMETER);
276 /* Handle root object case */
278 if (wake_device == ACPI_ROOT_OBJECT) {
279 device_node = acpi_gbl_root_node;
282 ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
285 /* Validate wake_device is of type Device */
287 if (device_node->type != ACPI_TYPE_DEVICE) {
288 return_ACPI_STATUS (AE_BAD_PARAMETER);
292 * Allocate a new notify object up front, in case it is needed.
293 * Memory allocation while holding a spinlock is a big no-no
296 new_notify = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_notify_info));
298 return_ACPI_STATUS(AE_NO_MEMORY);
301 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
303 /* Ensure that we have a valid GPE number */
305 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
306 if (!gpe_event_info) {
307 status = AE_BAD_PARAMETER;
308 goto unlock_and_exit;
312 * If there is no method or handler for this GPE, then the
313 * wake_device will be notified whenever this GPE fires. This is
314 * known as an "implicit notify". Note: The GPE is assumed to be
315 * level-triggered (for windows compatibility).
317 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
318 ACPI_GPE_DISPATCH_NONE) {
320 * This is the first device for implicit notify on this GPE.
321 * Just set the flags here, and enter the NOTIFY block below.
323 gpe_event_info->flags =
324 (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
328 * If we already have an implicit notify on this GPE, add
329 * this device to the notify list.
331 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
332 ACPI_GPE_DISPATCH_NOTIFY) {
334 /* Ensure that the device is not already in the list */
336 notify = gpe_event_info->dispatch.notify_list;
338 if (notify->device_node == device_node) {
339 status = AE_ALREADY_EXISTS;
340 goto unlock_and_exit;
342 notify = notify->next;
345 /* Add this device to the notify list for this GPE */
347 new_notify->device_node = device_node;
348 new_notify->next = gpe_event_info->dispatch.notify_list;
349 gpe_event_info->dispatch.notify_list = new_notify;
353 /* Mark the GPE as a possible wake event */
355 gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
359 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
361 /* Delete the notify object if it was not used above */
364 ACPI_FREE(new_notify);
366 return_ACPI_STATUS(status);
368 ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)
370 /*******************************************************************************
372 * FUNCTION: acpi_set_gpe_wake_mask
374 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
375 * gpe_number - GPE level within the GPE block
376 * action - Enable or Disable
380 * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
381 * already be marked as a WAKE GPE.
383 ******************************************************************************/
386 acpi_set_gpe_wake_mask(acpi_handle gpe_device, u32 gpe_number, u8 action)
388 acpi_status status = AE_OK;
389 struct acpi_gpe_event_info *gpe_event_info;
390 struct acpi_gpe_register_info *gpe_register_info;
391 acpi_cpu_flags flags;
394 ACPI_FUNCTION_TRACE(acpi_set_gpe_wake_mask);
396 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
399 * Ensure that we have a valid GPE number and that this GPE is in
402 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
403 if (!gpe_event_info) {
404 status = AE_BAD_PARAMETER;
405 goto unlock_and_exit;
408 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
410 goto unlock_and_exit;
413 gpe_register_info = gpe_event_info->register_info;
414 if (!gpe_register_info) {
415 status = AE_NOT_EXIST;
416 goto unlock_and_exit;
419 register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);
421 /* Perform the action */
424 case ACPI_GPE_ENABLE:
426 ACPI_SET_BIT(gpe_register_info->enable_for_wake,
430 case ACPI_GPE_DISABLE:
432 ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
438 ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
439 status = AE_BAD_PARAMETER;
444 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
445 return_ACPI_STATUS(status);
448 ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)
450 /*******************************************************************************
452 * FUNCTION: acpi_clear_gpe
454 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
455 * gpe_number - GPE level within the GPE block
459 * DESCRIPTION: Clear an ACPI event (general purpose)
461 ******************************************************************************/
462 acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
464 acpi_status status = AE_OK;
465 struct acpi_gpe_event_info *gpe_event_info;
466 acpi_cpu_flags flags;
468 ACPI_FUNCTION_TRACE(acpi_clear_gpe);
470 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
472 /* Ensure that we have a valid GPE number */
474 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
475 if (!gpe_event_info) {
476 status = AE_BAD_PARAMETER;
477 goto unlock_and_exit;
480 status = acpi_hw_clear_gpe(gpe_event_info);
483 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
484 return_ACPI_STATUS(status);
487 ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
489 /*******************************************************************************
491 * FUNCTION: acpi_get_gpe_status
493 * PARAMETERS: gpe_device - Parent GPE Device. NULL for GPE0/GPE1
494 * gpe_number - GPE level within the GPE block
495 * event_status - Where the current status of the event
500 * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
502 ******************************************************************************/
504 acpi_get_gpe_status(acpi_handle gpe_device,
505 u32 gpe_number, acpi_event_status *event_status)
507 acpi_status status = AE_OK;
508 struct acpi_gpe_event_info *gpe_event_info;
509 acpi_cpu_flags flags;
511 ACPI_FUNCTION_TRACE(acpi_get_gpe_status);
513 flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
515 /* Ensure that we have a valid GPE number */
517 gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
518 if (!gpe_event_info) {
519 status = AE_BAD_PARAMETER;
520 goto unlock_and_exit;
523 /* Obtain status on the requested GPE number */
525 status = acpi_hw_get_gpe_status(gpe_event_info, event_status);
527 if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
528 *event_status |= ACPI_EVENT_FLAG_HANDLE;
531 acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
532 return_ACPI_STATUS(status);
535 ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
537 /******************************************************************************
539 * FUNCTION: acpi_disable_all_gpes
545 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
547 ******************************************************************************/
549 acpi_status acpi_disable_all_gpes(void)
553 ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);
555 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
556 if (ACPI_FAILURE(status)) {
557 return_ACPI_STATUS(status);
560 status = acpi_hw_disable_all_gpes();
561 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
563 return_ACPI_STATUS(status);
566 ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)
568 /******************************************************************************
570 * FUNCTION: acpi_enable_all_runtime_gpes
576 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
578 ******************************************************************************/
580 acpi_status acpi_enable_all_runtime_gpes(void)
584 ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);
586 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
587 if (ACPI_FAILURE(status)) {
588 return_ACPI_STATUS(status);
591 status = acpi_hw_enable_all_runtime_gpes();
592 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
594 return_ACPI_STATUS(status);
597 ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)
599 /******************************************************************************
601 * FUNCTION: acpi_enable_all_wakeup_gpes
607 * DESCRIPTION: Enable all "wakeup" GPEs and disable all of the other GPEs, in
610 ******************************************************************************/
612 acpi_status acpi_enable_all_wakeup_gpes(void)
616 ACPI_FUNCTION_TRACE(acpi_enable_all_wakeup_gpes);
618 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
619 if (ACPI_FAILURE(status)) {
620 return_ACPI_STATUS(status);
623 status = acpi_hw_enable_all_wakeup_gpes();
624 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
626 return_ACPI_STATUS(status);
629 ACPI_EXPORT_SYMBOL(acpi_enable_all_wakeup_gpes)
631 /*******************************************************************************
633 * FUNCTION: acpi_install_gpe_block
635 * PARAMETERS: gpe_device - Handle to the parent GPE Block Device
636 * gpe_block_address - Address and space_ID
637 * register_count - Number of GPE register pairs in the block
638 * interrupt_number - H/W interrupt for the block
642 * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
645 ******************************************************************************/
647 acpi_install_gpe_block(acpi_handle gpe_device,
648 struct acpi_generic_address *gpe_block_address,
649 u32 register_count, u32 interrupt_number)
652 union acpi_operand_object *obj_desc;
653 struct acpi_namespace_node *node;
654 struct acpi_gpe_block_info *gpe_block;
656 ACPI_FUNCTION_TRACE(acpi_install_gpe_block);
658 if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
659 return_ACPI_STATUS(AE_BAD_PARAMETER);
662 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
663 if (ACPI_FAILURE(status)) {
664 return_ACPI_STATUS(status);
667 node = acpi_ns_validate_handle(gpe_device);
669 status = AE_BAD_PARAMETER;
670 goto unlock_and_exit;
673 /* Validate the parent device */
675 if (node->type != ACPI_TYPE_DEVICE) {
677 goto unlock_and_exit;
681 status = AE_ALREADY_EXISTS;
682 goto unlock_and_exit;
686 * For user-installed GPE Block Devices, the gpe_block_base_number
689 status = acpi_ev_create_gpe_block(node, gpe_block_address->address,
690 gpe_block_address->space_id,
691 register_count, 0, interrupt_number,
693 if (ACPI_FAILURE(status)) {
694 goto unlock_and_exit;
697 /* Install block in the device_object attached to the node */
699 obj_desc = acpi_ns_get_attached_object(node);
703 * No object, create a new one (Device nodes do not always have
704 * an attached object)
706 obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
708 status = AE_NO_MEMORY;
709 goto unlock_and_exit;
713 acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);
715 /* Remove local reference to the object */
717 acpi_ut_remove_reference(obj_desc);
719 if (ACPI_FAILURE(status)) {
720 goto unlock_and_exit;
724 /* Now install the GPE block in the device_object */
726 obj_desc->device.gpe_block = gpe_block;
729 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
730 return_ACPI_STATUS(status);
733 ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)
735 /*******************************************************************************
737 * FUNCTION: acpi_remove_gpe_block
739 * PARAMETERS: gpe_device - Handle to the parent GPE Block Device
743 * DESCRIPTION: Remove a previously installed block of GPE registers
745 ******************************************************************************/
746 acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
748 union acpi_operand_object *obj_desc;
750 struct acpi_namespace_node *node;
752 ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);
755 return_ACPI_STATUS(AE_BAD_PARAMETER);
758 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
759 if (ACPI_FAILURE(status)) {
760 return_ACPI_STATUS(status);
763 node = acpi_ns_validate_handle(gpe_device);
765 status = AE_BAD_PARAMETER;
766 goto unlock_and_exit;
769 /* Validate the parent device */
771 if (node->type != ACPI_TYPE_DEVICE) {
773 goto unlock_and_exit;
776 /* Get the device_object attached to the node */
778 obj_desc = acpi_ns_get_attached_object(node);
779 if (!obj_desc || !obj_desc->device.gpe_block) {
780 return_ACPI_STATUS(AE_NULL_OBJECT);
783 /* Delete the GPE block (but not the device_object) */
785 status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
786 if (ACPI_SUCCESS(status)) {
787 obj_desc->device.gpe_block = NULL;
791 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
792 return_ACPI_STATUS(status);
795 ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)
797 /*******************************************************************************
799 * FUNCTION: acpi_get_gpe_device
801 * PARAMETERS: index - System GPE index (0-current_gpe_count)
802 * gpe_device - Where the parent GPE Device is returned
806 * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
807 * gpe device indicates that the gpe number is contained in one of
808 * the FADT-defined gpe blocks. Otherwise, the GPE block device.
810 ******************************************************************************/
811 acpi_status acpi_get_gpe_device(u32 index, acpi_handle * gpe_device)
813 struct acpi_gpe_device_info info;
816 ACPI_FUNCTION_TRACE(acpi_get_gpe_device);
819 return_ACPI_STATUS(AE_BAD_PARAMETER);
822 if (index >= acpi_current_gpe_count) {
823 return_ACPI_STATUS(AE_NOT_EXIST);
826 /* Setup and walk the GPE list */
829 info.status = AE_NOT_EXIST;
830 info.gpe_device = NULL;
831 info.next_block_base_index = 0;
833 status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
834 if (ACPI_FAILURE(status)) {
835 return_ACPI_STATUS(status);
838 *gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
839 return_ACPI_STATUS(info.status);
842 ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
843 #endif /* !ACPI_REDUCED_HARDWARE */