[PATCH] acpi hotplug: fix slot power-down problem with acpiphp
[linux-2.6] / drivers / acpi / events / evxfevnt.c
1 /******************************************************************************
2  *
3  * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
4  *
5  *****************************************************************************/
6
7 /*
8  * Copyright (C) 2000 - 2005, R. Byron Moore
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/module.h>
45
46 #include <acpi/acpi.h>
47 #include <acpi/acevents.h>
48 #include <acpi/acnamesp.h>
49
50 #define _COMPONENT          ACPI_EVENTS
51          ACPI_MODULE_NAME    ("evxfevnt")
52
53
54 /*******************************************************************************
55  *
56  * FUNCTION:    acpi_enable
57  *
58  * PARAMETERS:  None
59  *
60  * RETURN:      Status
61  *
62  * DESCRIPTION: Transfers the system into ACPI mode.
63  *
64  ******************************************************************************/
65
66 acpi_status
67 acpi_enable (void)
68 {
69         acpi_status                     status = AE_OK;
70
71
72         ACPI_FUNCTION_TRACE ("acpi_enable");
73
74
75         /* Make sure we have the FADT*/
76
77         if (!acpi_gbl_FADT) {
78                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));
79                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
80         }
81
82         if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
83                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in ACPI mode\n"));
84         }
85         else {
86                 /* Transition to ACPI mode */
87
88                 status = acpi_hw_set_mode (ACPI_SYS_MODE_ACPI);
89                 if (ACPI_FAILURE (status)) {
90                         ACPI_REPORT_ERROR (("Could not transition to ACPI mode.\n"));
91                         return_ACPI_STATUS (status);
92                 }
93
94                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "Transition to ACPI mode successful\n"));
95         }
96
97         return_ACPI_STATUS (status);
98 }
99
100
101 /*******************************************************************************
102  *
103  * FUNCTION:    acpi_disable
104  *
105  * PARAMETERS:  None
106  *
107  * RETURN:      Status
108  *
109  * DESCRIPTION: Transfers the system into LEGACY mode.
110  *
111  ******************************************************************************/
112
113 acpi_status
114 acpi_disable (void)
115 {
116         acpi_status                     status = AE_OK;
117
118
119         ACPI_FUNCTION_TRACE ("acpi_disable");
120
121
122         if (!acpi_gbl_FADT) {
123                 ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No FADT information present!\n"));
124                 return_ACPI_STATUS (AE_NO_ACPI_TABLES);
125         }
126
127         if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
128                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "System is already in legacy (non-ACPI) mode\n"));
129         }
130         else {
131                 /* Transition to LEGACY mode */
132
133                 status = acpi_hw_set_mode (ACPI_SYS_MODE_LEGACY);
134
135                 if (ACPI_FAILURE (status)) {
136                         ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Could not exit ACPI mode to legacy mode"));
137                         return_ACPI_STATUS (status);
138                 }
139
140                 ACPI_DEBUG_PRINT ((ACPI_DB_INIT, "ACPI mode disabled\n"));
141         }
142
143         return_ACPI_STATUS (status);
144 }
145
146
147 /*******************************************************************************
148  *
149  * FUNCTION:    acpi_enable_event
150  *
151  * PARAMETERS:  Event           - The fixed eventto be enabled
152  *              Flags           - Reserved
153  *
154  * RETURN:      Status
155  *
156  * DESCRIPTION: Enable an ACPI event (fixed)
157  *
158  ******************************************************************************/
159
160 acpi_status
161 acpi_enable_event (
162         u32                             event,
163         u32                             flags)
164 {
165         acpi_status                     status = AE_OK;
166         u32                             value;
167
168
169         ACPI_FUNCTION_TRACE ("acpi_enable_event");
170
171
172         /* Decode the Fixed Event */
173
174         if (event > ACPI_EVENT_MAX) {
175                 return_ACPI_STATUS (AE_BAD_PARAMETER);
176         }
177
178         /*
179          * Enable the requested fixed event (by writing a one to the
180          * enable register bit)
181          */
182         status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
183                          1, ACPI_MTX_LOCK);
184         if (ACPI_FAILURE (status)) {
185                 return_ACPI_STATUS (status);
186         }
187
188         /* Make sure that the hardware responded */
189
190         status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
191                           &value, ACPI_MTX_LOCK);
192         if (ACPI_FAILURE (status)) {
193                 return_ACPI_STATUS (status);
194         }
195
196         if (value != 1) {
197                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
198                         "Could not enable %s event\n", acpi_ut_get_event_name (event)));
199                 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
200         }
201
202         return_ACPI_STATUS (status);
203 }
204 EXPORT_SYMBOL(acpi_enable_event);
205
206
207 /*******************************************************************************
208  *
209  * FUNCTION:    acpi_set_gpe_type
210  *
211  * PARAMETERS:  gpe_device      - Parent GPE Device
212  *              gpe_number      - GPE level within the GPE block
213  *              Type            - New GPE type
214  *
215  * RETURN:      Status
216  *
217  * DESCRIPTION: Enable an ACPI event (general purpose)
218  *
219  ******************************************************************************/
220
221 acpi_status
222 acpi_set_gpe_type (
223         acpi_handle                     gpe_device,
224         u32                             gpe_number,
225         u8                              type)
226 {
227         acpi_status                     status = AE_OK;
228         struct acpi_gpe_event_info      *gpe_event_info;
229
230
231         ACPI_FUNCTION_TRACE ("acpi_set_gpe_type");
232
233
234         /* Ensure that we have a valid GPE number */
235
236         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
237         if (!gpe_event_info) {
238                 status = AE_BAD_PARAMETER;
239                 goto unlock_and_exit;
240         }
241
242         if ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
243                 return_ACPI_STATUS (AE_OK);
244         }
245
246         /* Set the new type (will disable GPE if currently enabled) */
247
248         status = acpi_ev_set_gpe_type (gpe_event_info, type);
249
250 unlock_and_exit:
251         return_ACPI_STATUS (status);
252 }
253 EXPORT_SYMBOL(acpi_set_gpe_type);
254
255
256 /*******************************************************************************
257  *
258  * FUNCTION:    acpi_enable_gpe
259  *
260  * PARAMETERS:  gpe_device      - Parent GPE Device
261  *              gpe_number      - GPE level within the GPE block
262  *              Flags           - Just enable, or also wake enable?
263  *                                Called from ISR or not
264  *
265  * RETURN:      Status
266  *
267  * DESCRIPTION: Enable an ACPI event (general purpose)
268  *
269  ******************************************************************************/
270
271 acpi_status
272 acpi_enable_gpe (
273         acpi_handle                     gpe_device,
274         u32                             gpe_number,
275         u32                             flags)
276 {
277         acpi_status                     status = AE_OK;
278         struct acpi_gpe_event_info      *gpe_event_info;
279
280
281         ACPI_FUNCTION_TRACE ("acpi_enable_gpe");
282
283
284         /* Use semaphore lock if not executing at interrupt level */
285
286         if (flags & ACPI_NOT_ISR) {
287                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
288                 if (ACPI_FAILURE (status)) {
289                         return_ACPI_STATUS (status);
290                 }
291         }
292
293         /* Ensure that we have a valid GPE number */
294
295         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
296         if (!gpe_event_info) {
297                 status = AE_BAD_PARAMETER;
298                 goto unlock_and_exit;
299         }
300
301         /* Perform the enable */
302
303         status = acpi_ev_enable_gpe (gpe_event_info, TRUE);
304
305 unlock_and_exit:
306         if (flags & ACPI_NOT_ISR) {
307                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
308         }
309         return_ACPI_STATUS (status);
310 }
311 EXPORT_SYMBOL(acpi_enable_gpe);
312
313
314 /*******************************************************************************
315  *
316  * FUNCTION:    acpi_disable_gpe
317  *
318  * PARAMETERS:  gpe_device      - Parent GPE Device
319  *              gpe_number      - GPE level within the GPE block
320  *              Flags           - Just disable, or also wake disable?
321  *                                Called from ISR or not
322  *
323  * RETURN:      Status
324  *
325  * DESCRIPTION: Disable an ACPI event (general purpose)
326  *
327  ******************************************************************************/
328
329 acpi_status
330 acpi_disable_gpe (
331         acpi_handle                     gpe_device,
332         u32                             gpe_number,
333         u32                             flags)
334 {
335         acpi_status                     status = AE_OK;
336         struct acpi_gpe_event_info      *gpe_event_info;
337
338
339         ACPI_FUNCTION_TRACE ("acpi_disable_gpe");
340
341
342         /* Use semaphore lock if not executing at interrupt level */
343
344         if (flags & ACPI_NOT_ISR) {
345                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
346                 if (ACPI_FAILURE (status)) {
347                         return_ACPI_STATUS (status);
348                 }
349         }
350
351         /* Ensure that we have a valid GPE number */
352
353         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
354         if (!gpe_event_info) {
355                 status = AE_BAD_PARAMETER;
356                 goto unlock_and_exit;
357         }
358
359         status = acpi_ev_disable_gpe (gpe_event_info);
360
361 unlock_and_exit:
362         if (flags & ACPI_NOT_ISR) {
363                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
364         }
365         return_ACPI_STATUS (status);
366 }
367
368
369 /*******************************************************************************
370  *
371  * FUNCTION:    acpi_disable_event
372  *
373  * PARAMETERS:  Event           - The fixed eventto be enabled
374  *              Flags           - Reserved
375  *
376  * RETURN:      Status
377  *
378  * DESCRIPTION: Disable an ACPI event (fixed)
379  *
380  ******************************************************************************/
381
382 acpi_status
383 acpi_disable_event (
384         u32                             event,
385         u32                             flags)
386 {
387         acpi_status                     status = AE_OK;
388         u32                             value;
389
390
391         ACPI_FUNCTION_TRACE ("acpi_disable_event");
392
393
394         /* Decode the Fixed Event */
395
396         if (event > ACPI_EVENT_MAX) {
397                 return_ACPI_STATUS (AE_BAD_PARAMETER);
398         }
399
400         /*
401          * Disable the requested fixed event (by writing a zero to the
402          * enable register bit)
403          */
404         status = acpi_set_register (acpi_gbl_fixed_event_info[event].enable_register_id,
405                          0, ACPI_MTX_LOCK);
406         if (ACPI_FAILURE (status)) {
407                 return_ACPI_STATUS (status);
408         }
409
410         status = acpi_get_register (acpi_gbl_fixed_event_info[event].enable_register_id,
411                          &value, ACPI_MTX_LOCK);
412         if (ACPI_FAILURE (status)) {
413                 return_ACPI_STATUS (status);
414         }
415
416         if (value != 0) {
417                 ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
418                         "Could not disable %s events\n", acpi_ut_get_event_name (event)));
419                 return_ACPI_STATUS (AE_NO_HARDWARE_RESPONSE);
420         }
421
422         return_ACPI_STATUS (status);
423 }
424 EXPORT_SYMBOL(acpi_disable_event);
425
426
427 /*******************************************************************************
428  *
429  * FUNCTION:    acpi_clear_event
430  *
431  * PARAMETERS:  Event           - The fixed event to be cleared
432  *
433  * RETURN:      Status
434  *
435  * DESCRIPTION: Clear an ACPI event (fixed)
436  *
437  ******************************************************************************/
438
439 acpi_status
440 acpi_clear_event (
441         u32                             event)
442 {
443         acpi_status                     status = AE_OK;
444
445
446         ACPI_FUNCTION_TRACE ("acpi_clear_event");
447
448
449         /* Decode the Fixed Event */
450
451         if (event > ACPI_EVENT_MAX) {
452                 return_ACPI_STATUS (AE_BAD_PARAMETER);
453         }
454
455         /*
456          * Clear the requested fixed event (By writing a one to the
457          * status register bit)
458          */
459         status = acpi_set_register (acpi_gbl_fixed_event_info[event].status_register_id,
460                         1, ACPI_MTX_LOCK);
461
462         return_ACPI_STATUS (status);
463 }
464 EXPORT_SYMBOL(acpi_clear_event);
465
466
467 /*******************************************************************************
468  *
469  * FUNCTION:    acpi_clear_gpe
470  *
471  * PARAMETERS:  gpe_device      - Parent GPE Device
472  *              gpe_number      - GPE level within the GPE block
473  *              Flags           - Called from an ISR or not
474  *
475  * RETURN:      Status
476  *
477  * DESCRIPTION: Clear an ACPI event (general purpose)
478  *
479  ******************************************************************************/
480
481 acpi_status
482 acpi_clear_gpe (
483         acpi_handle                     gpe_device,
484         u32                             gpe_number,
485         u32                             flags)
486 {
487         acpi_status                     status = AE_OK;
488         struct acpi_gpe_event_info      *gpe_event_info;
489
490
491         ACPI_FUNCTION_TRACE ("acpi_clear_gpe");
492
493
494         /* Use semaphore lock if not executing at interrupt level */
495
496         if (flags & ACPI_NOT_ISR) {
497                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
498                 if (ACPI_FAILURE (status)) {
499                         return_ACPI_STATUS (status);
500                 }
501         }
502
503         /* Ensure that we have a valid GPE number */
504
505         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
506         if (!gpe_event_info) {
507                 status = AE_BAD_PARAMETER;
508                 goto unlock_and_exit;
509         }
510
511         status = acpi_hw_clear_gpe (gpe_event_info);
512
513 unlock_and_exit:
514         if (flags & ACPI_NOT_ISR) {
515                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
516         }
517         return_ACPI_STATUS (status);
518 }
519
520
521 #ifdef ACPI_FUTURE_USAGE
522
523 /*******************************************************************************
524  *
525  * FUNCTION:    acpi_get_event_status
526  *
527  * PARAMETERS:  Event           - The fixed event
528  *              Event Status    - Where the current status of the event will
529  *                                be returned
530  *
531  * RETURN:      Status
532  *
533  * DESCRIPTION: Obtains and returns the current status of the event
534  *
535  ******************************************************************************/
536
537 acpi_status
538 acpi_get_event_status (
539         u32                             event,
540         acpi_event_status               *event_status)
541 {
542         acpi_status                     status = AE_OK;
543
544
545         ACPI_FUNCTION_TRACE ("acpi_get_event_status");
546
547
548         if (!event_status) {
549                 return_ACPI_STATUS (AE_BAD_PARAMETER);
550         }
551
552         /* Decode the Fixed Event */
553
554         if (event > ACPI_EVENT_MAX) {
555                 return_ACPI_STATUS (AE_BAD_PARAMETER);
556         }
557
558         /* Get the status of the requested fixed event */
559
560         status = acpi_get_register (acpi_gbl_fixed_event_info[event].status_register_id,
561                           event_status, ACPI_MTX_LOCK);
562
563         return_ACPI_STATUS (status);
564 }
565
566
567 /*******************************************************************************
568  *
569  * FUNCTION:    acpi_get_gpe_status
570  *
571  * PARAMETERS:  gpe_device      - Parent GPE Device
572  *              gpe_number      - GPE level within the GPE block
573  *              Flags           - Called from an ISR or not
574  *              Event Status    - Where the current status of the event will
575  *                                be returned
576  *
577  * RETURN:      Status
578  *
579  * DESCRIPTION: Get status of an event (general purpose)
580  *
581  ******************************************************************************/
582
583 acpi_status
584 acpi_get_gpe_status (
585         acpi_handle                     gpe_device,
586         u32                             gpe_number,
587         u32                             flags,
588         acpi_event_status               *event_status)
589 {
590         acpi_status                     status = AE_OK;
591         struct acpi_gpe_event_info      *gpe_event_info;
592
593
594         ACPI_FUNCTION_TRACE ("acpi_get_gpe_status");
595
596
597         /* Use semaphore lock if not executing at interrupt level */
598
599         if (flags & ACPI_NOT_ISR) {
600                 status = acpi_ut_acquire_mutex (ACPI_MTX_EVENTS);
601                 if (ACPI_FAILURE (status)) {
602                         return_ACPI_STATUS (status);
603                 }
604         }
605
606         /* Ensure that we have a valid GPE number */
607
608         gpe_event_info = acpi_ev_get_gpe_event_info (gpe_device, gpe_number);
609         if (!gpe_event_info) {
610                 status = AE_BAD_PARAMETER;
611                 goto unlock_and_exit;
612         }
613
614         /* Obtain status on the requested GPE number */
615
616         status = acpi_hw_get_gpe_status (gpe_event_info, event_status);
617
618 unlock_and_exit:
619         if (flags & ACPI_NOT_ISR) {
620                 (void) acpi_ut_release_mutex (ACPI_MTX_EVENTS);
621         }
622         return_ACPI_STATUS (status);
623 }
624 #endif  /*  ACPI_FUTURE_USAGE  */
625
626
627 /*******************************************************************************
628  *
629  * FUNCTION:    acpi_install_gpe_block
630  *
631  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
632  *              gpe_block_address   - Address and space_iD
633  *              register_count      - Number of GPE register pairs in the block
634  *              interrupt_level     - H/W interrupt for the block
635  *
636  * RETURN:      Status
637  *
638  * DESCRIPTION: Create and Install a block of GPE registers
639  *
640  ******************************************************************************/
641
642 acpi_status
643 acpi_install_gpe_block (
644         acpi_handle                     gpe_device,
645         struct acpi_generic_address     *gpe_block_address,
646         u32                             register_count,
647         u32                             interrupt_level)
648 {
649         acpi_status                     status;
650         union acpi_operand_object       *obj_desc;
651         struct acpi_namespace_node      *node;
652         struct acpi_gpe_block_info      *gpe_block;
653
654
655         ACPI_FUNCTION_TRACE ("acpi_install_gpe_block");
656
657
658         if ((!gpe_device)      ||
659                 (!gpe_block_address) ||
660                 (!register_count)) {
661                 return_ACPI_STATUS (AE_BAD_PARAMETER);
662         }
663
664         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
665         if (ACPI_FAILURE (status)) {
666                 return (status);
667         }
668
669         node = acpi_ns_map_handle_to_node (gpe_device);
670         if (!node) {
671                 status = AE_BAD_PARAMETER;
672                 goto unlock_and_exit;
673         }
674
675         /*
676          * For user-installed GPE Block Devices, the gpe_block_base_number
677          * is always zero
678          */
679         status = acpi_ev_create_gpe_block (node, gpe_block_address, register_count,
680                           0, interrupt_level, &gpe_block);
681         if (ACPI_FAILURE (status)) {
682                 goto unlock_and_exit;
683         }
684
685         /* Get the device_object attached to the node */
686
687         obj_desc = acpi_ns_get_attached_object (node);
688         if (!obj_desc) {
689                 /* No object, create a new one */
690
691                 obj_desc = acpi_ut_create_internal_object (ACPI_TYPE_DEVICE);
692                 if (!obj_desc) {
693                         status = AE_NO_MEMORY;
694                         goto unlock_and_exit;
695                 }
696
697                 status = acpi_ns_attach_object (node, obj_desc, ACPI_TYPE_DEVICE);
698
699                 /* Remove local reference to the object */
700
701                 acpi_ut_remove_reference (obj_desc);
702
703                 if (ACPI_FAILURE (status)) {
704                         goto unlock_and_exit;
705                 }
706         }
707
708         /* Install the GPE block in the device_object */
709
710         obj_desc->device.gpe_block = gpe_block;
711
712
713 unlock_and_exit:
714         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
715         return_ACPI_STATUS (status);
716 }
717 EXPORT_SYMBOL(acpi_install_gpe_block);
718
719
720 /*******************************************************************************
721  *
722  * FUNCTION:    acpi_remove_gpe_block
723  *
724  * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
725  *
726  * RETURN:      Status
727  *
728  * DESCRIPTION: Remove a previously installed block of GPE registers
729  *
730  ******************************************************************************/
731
732 acpi_status
733 acpi_remove_gpe_block (
734         acpi_handle                     gpe_device)
735 {
736         union acpi_operand_object       *obj_desc;
737         acpi_status                     status;
738         struct acpi_namespace_node      *node;
739
740
741         ACPI_FUNCTION_TRACE ("acpi_remove_gpe_block");
742
743
744         if (!gpe_device) {
745                 return_ACPI_STATUS (AE_BAD_PARAMETER);
746         }
747
748         status = acpi_ut_acquire_mutex (ACPI_MTX_NAMESPACE);
749         if (ACPI_FAILURE (status)) {
750                 return (status);
751         }
752
753         node = acpi_ns_map_handle_to_node (gpe_device);
754         if (!node) {
755                 status = AE_BAD_PARAMETER;
756                 goto unlock_and_exit;
757         }
758
759         /* Get the device_object attached to the node */
760
761         obj_desc = acpi_ns_get_attached_object (node);
762         if (!obj_desc ||
763                 !obj_desc->device.gpe_block) {
764                 return_ACPI_STATUS (AE_NULL_OBJECT);
765         }
766
767         /* Delete the GPE block (but not the device_object) */
768
769         status = acpi_ev_delete_gpe_block (obj_desc->device.gpe_block);
770         if (ACPI_SUCCESS (status)) {
771                 obj_desc->device.gpe_block = NULL;
772         }
773
774 unlock_and_exit:
775         (void) acpi_ut_release_mutex (ACPI_MTX_NAMESPACE);
776         return_ACPI_STATUS (status);
777 }
778 EXPORT_SYMBOL(acpi_remove_gpe_block);