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authorBob Moore <robert.moore@intel.com>2010-04-26 23:41:19 -0400
committerLen Brown <len.brown@intel.com>2010-05-06 03:05:54 -0400
commit3fe50208b29b2463eb6c181c1433dd1beb39f282 (patch)
treea35b7e47a5130e2d0179e34c69a7cae55a327b77 /drivers/acpi/acpica/evgpeinit.c
parent186c307f008d2a53961cd970aaf7cb9c33e79cb1 (diff)
ACPICA: Split large file, evgpeblk
Create two new files, evgpeinit.c and evgpeutil.c. Updated unix and linux makefiles. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/evgpeinit.c')
-rw-r--r--drivers/acpi/acpica/evgpeinit.c653
1 files changed, 653 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/evgpeinit.c b/drivers/acpi/acpica/evgpeinit.c
new file mode 100644
index 000000000000..3f6c2d26410d
--- /dev/null
+++ b/drivers/acpi/acpica/evgpeinit.c
@@ -0,0 +1,653 @@
1/******************************************************************************
2 *
3 * Module Name: evgpeinit - System GPE initialization and update
4 *
5 *****************************************************************************/
6
7/*
8 * Copyright (C) 2000 - 2010, 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 <acpi/acpi.h>
45#include "accommon.h"
46#include "acevents.h"
47#include "acnamesp.h"
48#include "acinterp.h"
49
50#define _COMPONENT ACPI_EVENTS
51ACPI_MODULE_NAME("evgpeinit")
52
53/*******************************************************************************
54 *
55 * FUNCTION: acpi_ev_gpe_initialize
56 *
57 * PARAMETERS: None
58 *
59 * RETURN: Status
60 *
61 * DESCRIPTION: Initialize the GPE data structures and the FADT GPE 0/1 blocks
62 *
63 ******************************************************************************/
64acpi_status acpi_ev_gpe_initialize(void)
65{
66 u32 register_count0 = 0;
67 u32 register_count1 = 0;
68 u32 gpe_number_max = 0;
69 acpi_status status;
70
71 ACPI_FUNCTION_TRACE(ev_gpe_initialize);
72
73 status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
74 if (ACPI_FAILURE(status)) {
75 return_ACPI_STATUS(status);
76 }
77
78 /*
79 * Initialize the GPE Block(s) defined in the FADT
80 *
81 * Why the GPE register block lengths are divided by 2: From the ACPI
82 * Spec, section "General-Purpose Event Registers", we have:
83 *
84 * "Each register block contains two registers of equal length
85 * GPEx_STS and GPEx_EN (where x is 0 or 1). The length of the
86 * GPE0_STS and GPE0_EN registers is equal to half the GPE0_LEN
87 * The length of the GPE1_STS and GPE1_EN registers is equal to
88 * half the GPE1_LEN. If a generic register block is not supported
89 * then its respective block pointer and block length values in the
90 * FADT table contain zeros. The GPE0_LEN and GPE1_LEN do not need
91 * to be the same size."
92 */
93
94 /*
95 * Determine the maximum GPE number for this machine.
96 *
97 * Note: both GPE0 and GPE1 are optional, and either can exist without
98 * the other.
99 *
100 * If EITHER the register length OR the block address are zero, then that
101 * particular block is not supported.
102 */
103 if (acpi_gbl_FADT.gpe0_block_length &&
104 acpi_gbl_FADT.xgpe0_block.address) {
105
106 /* GPE block 0 exists (has both length and address > 0) */
107
108 register_count0 = (u16)(acpi_gbl_FADT.gpe0_block_length / 2);
109
110 gpe_number_max =
111 (register_count0 * ACPI_GPE_REGISTER_WIDTH) - 1;
112
113 /* Install GPE Block 0 */
114
115 status = acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
116 &acpi_gbl_FADT.xgpe0_block,
117 register_count0, 0,
118 acpi_gbl_FADT.sci_interrupt,
119 &acpi_gbl_gpe_fadt_blocks[0]);
120
121 if (ACPI_FAILURE(status)) {
122 ACPI_EXCEPTION((AE_INFO, status,
123 "Could not create GPE Block 0"));
124 }
125 }
126
127 if (acpi_gbl_FADT.gpe1_block_length &&
128 acpi_gbl_FADT.xgpe1_block.address) {
129
130 /* GPE block 1 exists (has both length and address > 0) */
131
132 register_count1 = (u16)(acpi_gbl_FADT.gpe1_block_length / 2);
133
134 /* Check for GPE0/GPE1 overlap (if both banks exist) */
135
136 if ((register_count0) &&
137 (gpe_number_max >= acpi_gbl_FADT.gpe1_base)) {
138 ACPI_ERROR((AE_INFO,
139 "GPE0 block (GPE 0 to %u) overlaps the GPE1 block "
140 "(GPE %u to %u) - Ignoring GPE1",
141 gpe_number_max, acpi_gbl_FADT.gpe1_base,
142 acpi_gbl_FADT.gpe1_base +
143 ((register_count1 *
144 ACPI_GPE_REGISTER_WIDTH) - 1)));
145
146 /* Ignore GPE1 block by setting the register count to zero */
147
148 register_count1 = 0;
149 } else {
150 /* Install GPE Block 1 */
151
152 status =
153 acpi_ev_create_gpe_block(acpi_gbl_fadt_gpe_device,
154 &acpi_gbl_FADT.xgpe1_block,
155 register_count1,
156 acpi_gbl_FADT.gpe1_base,
157 acpi_gbl_FADT.
158 sci_interrupt,
159 &acpi_gbl_gpe_fadt_blocks
160 [1]);
161
162 if (ACPI_FAILURE(status)) {
163 ACPI_EXCEPTION((AE_INFO, status,
164 "Could not create GPE Block 1"));
165 }
166
167 /*
168 * GPE0 and GPE1 do not have to be contiguous in the GPE number
169 * space. However, GPE0 always starts at GPE number zero.
170 */
171 gpe_number_max = acpi_gbl_FADT.gpe1_base +
172 ((register_count1 * ACPI_GPE_REGISTER_WIDTH) - 1);
173 }
174 }
175
176 /* Exit if there are no GPE registers */
177
178 if ((register_count0 + register_count1) == 0) {
179
180 /* GPEs are not required by ACPI, this is OK */
181
182 ACPI_DEBUG_PRINT((ACPI_DB_INIT,
183 "There are no GPE blocks defined in the FADT\n"));
184 status = AE_OK;
185 goto cleanup;
186 }
187
188 /* Check for Max GPE number out-of-range */
189
190 if (gpe_number_max > ACPI_GPE_MAX) {
191 ACPI_ERROR((AE_INFO,
192 "Maximum GPE number from FADT is too large: 0x%X",
193 gpe_number_max));
194 status = AE_BAD_VALUE;
195 goto cleanup;
196 }
197
198 cleanup:
199 (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
200 return_ACPI_STATUS(AE_OK);
201}
202
203/*******************************************************************************
204 *
205 * FUNCTION: acpi_ev_update_gpes
206 *
207 * PARAMETERS: table_owner_id - ID of the newly-loaded ACPI table
208 *
209 * RETURN: None
210 *
211 * DESCRIPTION: Check for new GPE methods (_Lxx/_Exx) made available as a
212 * result of a Load() or load_table() operation. If new GPE
213 * methods have been installed, register the new methods and
214 * enable and runtime GPEs that are associated with them. Also,
215 * run any newly loaded _PRW methods in order to discover any
216 * new CAN_WAKE GPEs.
217 *
218 ******************************************************************************/
219
220void acpi_ev_update_gpes(acpi_owner_id table_owner_id)
221{
222 struct acpi_gpe_xrupt_info *gpe_xrupt_info;
223 struct acpi_gpe_block_info *gpe_block;
224 struct acpi_gpe_walk_info walk_info;
225 acpi_status status = AE_OK;
226 u32 new_wake_gpe_count = 0;
227
228 /* We will examine only _PRW/_Lxx/_Exx methods owned by this table */
229
230 walk_info.owner_id = table_owner_id;
231 walk_info.execute_by_owner_id = TRUE;
232 walk_info.count = 0;
233
234 if (acpi_gbl_leave_wake_gpes_disabled) {
235 /*
236 * 1) Run any newly-loaded _PRW methods to find any GPEs that
237 * can now be marked as CAN_WAKE GPEs. Note: We must run the
238 * _PRW methods before we process the _Lxx/_Exx methods because
239 * we will enable all runtime GPEs associated with the new
240 * _Lxx/_Exx methods at the time we process those methods.
241 *
242 * Unlock interpreter so that we can run the _PRW methods.
243 */
244 walk_info.gpe_block = NULL;
245 walk_info.gpe_device = NULL;
246
247 acpi_ex_exit_interpreter();
248
249 status =
250 acpi_ns_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
251 ACPI_UINT32_MAX,
252 ACPI_NS_WALK_NO_UNLOCK,
253 acpi_ev_match_prw_and_gpe, NULL,
254 &walk_info, NULL);
255 if (ACPI_FAILURE(status)) {
256 ACPI_EXCEPTION((AE_INFO, status,
257 "While executing _PRW methods"));
258 }
259
260 acpi_ex_enter_interpreter();
261 new_wake_gpe_count = walk_info.count;
262 }
263
264 /*
265 * 2) Find any _Lxx/_Exx GPE methods that have just been loaded.
266 *
267 * Any GPEs that correspond to new _Lxx/_Exx methods and are not
268 * marked as CAN_WAKE are immediately enabled.
269 *
270 * Examine the namespace underneath each gpe_device within the
271 * gpe_block lists.
272 */
273 status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
274 if (ACPI_FAILURE(status)) {
275 return;
276 }
277
278 walk_info.count = 0;
279 walk_info.enable_this_gpe = TRUE;
280
281 /* Walk the interrupt level descriptor list */
282
283 gpe_xrupt_info = acpi_gbl_gpe_xrupt_list_head;
284 while (gpe_xrupt_info) {
285
286 /* Walk all Gpe Blocks attached to this interrupt level */
287
288 gpe_block = gpe_xrupt_info->gpe_block_list_head;
289 while (gpe_block) {
290 walk_info.gpe_block = gpe_block;
291 walk_info.gpe_device = gpe_block->node;
292
293 status = acpi_ns_walk_namespace(ACPI_TYPE_METHOD,
294 walk_info.gpe_device,
295 ACPI_UINT32_MAX,
296 ACPI_NS_WALK_NO_UNLOCK,
297 acpi_ev_match_gpe_method,
298 NULL, &walk_info, NULL);
299 if (ACPI_FAILURE(status)) {
300 ACPI_EXCEPTION((AE_INFO, status,
301 "While decoding _Lxx/_Exx methods"));
302 }
303
304 gpe_block = gpe_block->next;
305 }
306
307 gpe_xrupt_info = gpe_xrupt_info->next;
308 }
309
310 if (walk_info.count || new_wake_gpe_count) {
311 ACPI_INFO((AE_INFO,
312 "Enabled %u new runtime GPEs, added %u new wakeup GPEs",
313 walk_info.count, new_wake_gpe_count));
314 }
315
316 (void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
317 return;
318}
319
320/*******************************************************************************
321 *
322 * FUNCTION: acpi_ev_match_gpe_method
323 *
324 * PARAMETERS: Callback from walk_namespace
325 *
326 * RETURN: Status
327 *
328 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
329 * control method under the _GPE portion of the namespace.
330 * Extract the name and GPE type from the object, saving this
331 * information for quick lookup during GPE dispatch. Allows a
332 * per-owner_id evaluation if execute_by_owner_id is TRUE in the
333 * walk_info parameter block.
334 *
335 * The name of each GPE control method is of the form:
336 * "_Lxx" or "_Exx", where:
337 * L - means that the GPE is level triggered
338 * E - means that the GPE is edge triggered
339 * xx - is the GPE number [in HEX]
340 *
341 * If walk_info->execute_by_owner_id is TRUE, we only execute examine GPE methods
342 * with that owner.
343 * If walk_info->enable_this_gpe is TRUE, the GPE that is referred to by a GPE
344 * method is immediately enabled (Used for Load/load_table operators)
345 *
346 ******************************************************************************/
347
348acpi_status
349acpi_ev_match_gpe_method(acpi_handle obj_handle,
350 u32 level, void *context, void **return_value)
351{
352 struct acpi_namespace_node *method_node =
353 ACPI_CAST_PTR(struct acpi_namespace_node, obj_handle);
354 struct acpi_gpe_walk_info *walk_info =
355 ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
356 struct acpi_gpe_event_info *gpe_event_info;
357 struct acpi_namespace_node *gpe_device;
358 acpi_status status;
359 u32 gpe_number;
360 char name[ACPI_NAME_SIZE + 1];
361 u8 type;
362
363 ACPI_FUNCTION_TRACE(ev_match_gpe_method);
364
365 /* Check if requested owner_id matches this owner_id */
366
367 if ((walk_info->execute_by_owner_id) &&
368 (method_node->owner_id != walk_info->owner_id)) {
369 return_ACPI_STATUS(AE_OK);
370 }
371
372 /*
373 * Match and decode the _Lxx and _Exx GPE method names
374 *
375 * 1) Extract the method name and null terminate it
376 */
377 ACPI_MOVE_32_TO_32(name, &method_node->name.integer);
378 name[ACPI_NAME_SIZE] = 0;
379
380 /* 2) Name must begin with an underscore */
381
382 if (name[0] != '_') {
383 return_ACPI_STATUS(AE_OK); /* Ignore this method */
384 }
385
386 /*
387 * 3) Edge/Level determination is based on the 2nd character
388 * of the method name
389 *
390 * NOTE: Default GPE type is RUNTIME only. Later, if a _PRW object is
391 * found that points to this GPE, the ACPI_GPE_CAN_WAKE flag is set.
392 */
393 switch (name[1]) {
394 case 'L':
395 type = ACPI_GPE_LEVEL_TRIGGERED;
396 break;
397
398 case 'E':
399 type = ACPI_GPE_EDGE_TRIGGERED;
400 break;
401
402 default:
403 /* Unknown method type, just ignore it */
404
405 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
406 "Ignoring unknown GPE method type: %s "
407 "(name not of form _Lxx or _Exx)", name));
408 return_ACPI_STATUS(AE_OK);
409 }
410
411 /* 4) The last two characters of the name are the hex GPE Number */
412
413 gpe_number = ACPI_STRTOUL(&name[2], NULL, 16);
414 if (gpe_number == ACPI_UINT32_MAX) {
415
416 /* Conversion failed; invalid method, just ignore it */
417
418 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
419 "Could not extract GPE number from name: %s "
420 "(name is not of form _Lxx or _Exx)", name));
421 return_ACPI_STATUS(AE_OK);
422 }
423
424 /* Ensure that we have a valid GPE number for this GPE block */
425
426 gpe_event_info =
427 acpi_ev_low_get_gpe_info(gpe_number, walk_info->gpe_block);
428 if (!gpe_event_info) {
429 /*
430 * This gpe_number is not valid for this GPE block, just ignore it.
431 * However, it may be valid for a different GPE block, since GPE0
432 * and GPE1 methods both appear under \_GPE.
433 */
434 return_ACPI_STATUS(AE_OK);
435 }
436
437 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
438 ACPI_GPE_DISPATCH_HANDLER) {
439
440 /* If there is already a handler, ignore this GPE method */
441
442 return_ACPI_STATUS(AE_OK);
443 }
444
445 if ((gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK) ==
446 ACPI_GPE_DISPATCH_METHOD) {
447 /*
448 * If there is already a method, ignore this method. But check
449 * for a type mismatch (if both the _Lxx AND _Exx exist)
450 */
451 if (type != (gpe_event_info->flags & ACPI_GPE_XRUPT_TYPE_MASK)) {
452 ACPI_ERROR((AE_INFO,
453 "For GPE 0x%.2X, found both _L%2.2X and _E%2.2X methods",
454 gpe_number, gpe_number, gpe_number));
455 }
456 return_ACPI_STATUS(AE_OK);
457 }
458
459 /*
460 * Add the GPE information from above to the gpe_event_info block for
461 * use during dispatch of this GPE.
462 */
463 gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_METHOD);
464 gpe_event_info->dispatch.method_node = method_node;
465
466 /*
467 * Enable this GPE if requested. This only happens when during the
468 * execution of a Load or load_table operator. We have found a new
469 * GPE method and want to immediately enable the GPE if it is a
470 * runtime GPE.
471 */
472 if (walk_info->enable_this_gpe) {
473
474 /* Ignore GPEs that can wake the system */
475
476 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE) ||
477 !acpi_gbl_leave_wake_gpes_disabled) {
478 walk_info->count++;
479 gpe_device = walk_info->gpe_device;
480
481 if (gpe_device == acpi_gbl_fadt_gpe_device) {
482 gpe_device = NULL;
483 }
484
485 status = acpi_enable_gpe(gpe_device, gpe_number,
486 ACPI_GPE_TYPE_RUNTIME);
487 if (ACPI_FAILURE(status)) {
488 ACPI_EXCEPTION((AE_INFO, status,
489 "Could not enable GPE 0x%02X",
490 gpe_number));
491 }
492 }
493 }
494
495 ACPI_DEBUG_PRINT((ACPI_DB_LOAD,
496 "Registered GPE method %s as GPE number 0x%.2X\n",
497 name, gpe_number));
498 return_ACPI_STATUS(AE_OK);
499}
500
501/*******************************************************************************
502 *
503 * FUNCTION: acpi_ev_match_prw_and_gpe
504 *
505 * PARAMETERS: Callback from walk_namespace
506 *
507 * RETURN: Status. NOTE: We ignore errors so that the _PRW walk is
508 * not aborted on a single _PRW failure.
509 *
510 * DESCRIPTION: Called from acpi_walk_namespace. Expects each object to be a
511 * Device. Run the _PRW method. If present, extract the GPE
512 * number and mark the GPE as a CAN_WAKE GPE. Allows a
513 * per-owner_id execution if execute_by_owner_id is TRUE in the
514 * walk_info parameter block.
515 *
516 * If walk_info->execute_by_owner_id is TRUE, we only execute _PRWs with that
517 * owner.
518 * If walk_info->gpe_device is NULL, we execute every _PRW found. Otherwise,
519 * we only execute _PRWs that refer to the input gpe_device.
520 *
521 ******************************************************************************/
522
523acpi_status
524acpi_ev_match_prw_and_gpe(acpi_handle obj_handle,
525 u32 level, void *context, void **return_value)
526{
527 struct acpi_gpe_walk_info *walk_info =
528 ACPI_CAST_PTR(struct acpi_gpe_walk_info, context);
529 struct acpi_namespace_node *gpe_device;
530 struct acpi_gpe_block_info *gpe_block;
531 struct acpi_namespace_node *target_gpe_device;
532 struct acpi_namespace_node *prw_node;
533 struct acpi_gpe_event_info *gpe_event_info;
534 union acpi_operand_object *pkg_desc;
535 union acpi_operand_object *obj_desc;
536 u32 gpe_number;
537 acpi_status status;
538
539 ACPI_FUNCTION_TRACE(ev_match_prw_and_gpe);
540
541 /* Check for a _PRW method under this device */
542
543 status = acpi_ns_get_node(obj_handle, METHOD_NAME__PRW,
544 ACPI_NS_NO_UPSEARCH, &prw_node);
545 if (ACPI_FAILURE(status)) {
546 return_ACPI_STATUS(AE_OK);
547 }
548
549 /* Check if requested owner_id matches this owner_id */
550
551 if ((walk_info->execute_by_owner_id) &&
552 (prw_node->owner_id != walk_info->owner_id)) {
553 return_ACPI_STATUS(AE_OK);
554 }
555
556 /* Execute the _PRW */
557
558 status = acpi_ut_evaluate_object(prw_node, NULL,
559 ACPI_BTYPE_PACKAGE, &pkg_desc);
560 if (ACPI_FAILURE(status)) {
561 return_ACPI_STATUS(AE_OK);
562 }
563
564 /* The returned _PRW package must have at least two elements */
565
566 if (pkg_desc->package.count < 2) {
567 goto cleanup;
568 }
569
570 /* Extract pointers from the input context */
571
572 gpe_device = walk_info->gpe_device;
573 gpe_block = walk_info->gpe_block;
574
575 /*
576 * The _PRW object must return a package, we are only interested
577 * in the first element
578 */
579 obj_desc = pkg_desc->package.elements[0];
580
581 if (obj_desc->common.type == ACPI_TYPE_INTEGER) {
582
583 /* Use FADT-defined GPE device (from definition of _PRW) */
584
585 target_gpe_device = NULL;
586 if (gpe_device) {
587 target_gpe_device = acpi_gbl_fadt_gpe_device;
588 }
589
590 /* Integer is the GPE number in the FADT described GPE blocks */
591
592 gpe_number = (u32)obj_desc->integer.value;
593 } else if (obj_desc->common.type == ACPI_TYPE_PACKAGE) {
594
595 /* Package contains a GPE reference and GPE number within a GPE block */
596
597 if ((obj_desc->package.count < 2) ||
598 ((obj_desc->package.elements[0])->common.type !=
599 ACPI_TYPE_LOCAL_REFERENCE) ||
600 ((obj_desc->package.elements[1])->common.type !=
601 ACPI_TYPE_INTEGER)) {
602 goto cleanup;
603 }
604
605 /* Get GPE block reference and decode */
606
607 target_gpe_device =
608 obj_desc->package.elements[0]->reference.node;
609 gpe_number = (u32)obj_desc->package.elements[1]->integer.value;
610 } else {
611 /* Unknown type, just ignore it */
612
613 goto cleanup;
614 }
615
616 /* Get the gpe_event_info for this GPE */
617
618 if (gpe_device) {
619 /*
620 * Is this GPE within this block?
621 *
622 * TRUE if and only if these conditions are true:
623 * 1) The GPE devices match.
624 * 2) The GPE index(number) is within the range of the Gpe Block
625 * associated with the GPE device.
626 */
627 if (gpe_device != target_gpe_device) {
628 goto cleanup;
629 }
630
631 gpe_event_info =
632 acpi_ev_low_get_gpe_info(gpe_number, gpe_block);
633 } else {
634 /* gpe_device is NULL, just match the target_device and gpe_number */
635
636 gpe_event_info =
637 acpi_ev_get_gpe_event_info(target_gpe_device, gpe_number);
638 }
639
640 if (gpe_event_info) {
641 if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
642
643 /* This GPE can wake the system */
644
645 gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
646 walk_info->count++;
647 }
648 }
649
650 cleanup:
651 acpi_ut_remove_reference(pkg_desc);
652 return_ACPI_STATUS(AE_OK);
653}