More missed named fixups related to the include directory move.
[dragonfly.git] / sys / dev / acpica5 / acpi_powerres.c
CommitLineData
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1/*-
2 * Copyright (c) 2001 Michael Smith
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/dev/acpica/acpi_powerres.c,v 1.17 2004/02/12 20:45:01 jhb Exp $
8c1d15dd 27 * $DragonFly: src/sys/dev/acpica5/acpi_powerres.c,v 1.2 2004/05/05 22:19:24 dillon Exp $
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28 */
29
30#include "opt_acpi.h"
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/malloc.h>
34#include <sys/bus.h>
35
36#include "acpi.h"
37#include <dev/acpica5/acpivar.h>
38
39/*
40 * ACPI power resource management.
41 *
42 * Power resource behaviour is slightly complicated by the fact that
43 * a single power resource may provide power for more than one device.
44 * Thus, we must track the device(s) being powered by a given power
45 * resource, and only deactivate it when there are no powered devices.
46 *
47 * Note that this only manages resources for known devices. There is an
48 * ugly case where we may turn of power to a device which is in use because
49 * we don't know that it depends on a given resource. We should perhaps
50 * try to be smarter about this, but a more complete solution would involve
51 * scanning all of the ACPI namespace to find devices we're not currently
52 * aware of, and this raises questions about whether they should be left
53 * on, turned off, etc.
54 *
55 * XXX locking
56 */
57
58MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources");
59
60/* Hooks for the ACPI CA debugging infrastructure */
61#define _COMPONENT ACPI_POWER
62ACPI_MODULE_NAME("POWERRES")
63
64/* Return values from _STA on a power resource */
65#define ACPI_PWR_OFF 0
66#define ACPI_PWR_ON 1
67
68/* A relationship between a power resource and a consumer. */
69struct acpi_powerreference {
70 struct acpi_powerconsumer *ar_consumer;
71 struct acpi_powerresource *ar_resource;
72 TAILQ_ENTRY(acpi_powerreference) ar_rlink; /* link on resource list */
73 TAILQ_ENTRY(acpi_powerreference) ar_clink; /* link on consumer */
74};
75
76/* A power-managed device. */
77struct acpi_powerconsumer {
78 /* Device which is powered */
79 ACPI_HANDLE ac_consumer;
80 int ac_state;
81 TAILQ_ENTRY(acpi_powerconsumer) ac_link;
82 TAILQ_HEAD(,acpi_powerreference) ac_references;
83};
84
85/* A power resource. */
86struct acpi_powerresource {
87 TAILQ_ENTRY(acpi_powerresource) ap_link;
88 TAILQ_HEAD(,acpi_powerreference) ap_references;
89 ACPI_HANDLE ap_resource;
90 ACPI_INTEGER ap_systemlevel;
91 ACPI_INTEGER ap_order;
92};
93
94static TAILQ_HEAD(acpi_powerresource_list, acpi_powerresource)
95 acpi_powerresources;
96static TAILQ_HEAD(acpi_powerconsumer_list, acpi_powerconsumer)
97 acpi_powerconsumers;
98
99static ACPI_STATUS acpi_pwr_register_consumer(ACPI_HANDLE consumer);
100static ACPI_STATUS acpi_pwr_deregister_consumer(ACPI_HANDLE consumer);
101static ACPI_STATUS acpi_pwr_register_resource(ACPI_HANDLE res);
102static ACPI_STATUS acpi_pwr_deregister_resource(ACPI_HANDLE res);
103static void acpi_pwr_reference_resource(ACPI_OBJECT *obj,
104 void *arg);
105static ACPI_STATUS acpi_pwr_switch_power(void);
106static struct acpi_powerresource
107 *acpi_pwr_find_resource(ACPI_HANDLE res);
108static struct acpi_powerconsumer
109 *acpi_pwr_find_consumer(ACPI_HANDLE consumer);
110
111/* Initialise our lists. */
112static void
113acpi_pwr_init(void *junk)
114{
115 TAILQ_INIT(&acpi_powerresources);
116 TAILQ_INIT(&acpi_powerconsumers);
117}
118SYSINIT(acpi_powerresource, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL);
119
120/*
121 * Register a power resource.
122 *
123 * It's OK to call this if we already know about the resource.
124 */
125static ACPI_STATUS
126acpi_pwr_register_resource(ACPI_HANDLE res)
127{
128 ACPI_STATUS status;
129 ACPI_BUFFER buf;
130 ACPI_OBJECT *obj;
131 struct acpi_powerresource *rp, *srp;
132
133 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
134
135 rp = NULL;
136 buf.Pointer = NULL;
137
138 /* Look to see if we know about this resource */
139 if (acpi_pwr_find_resource(res) != NULL)
140 return_ACPI_STATUS (AE_OK); /* already know about it */
141
142 /* Allocate a new resource */
8c1d15dd 143 rp = malloc(sizeof(*rp), M_ACPIPWR, M_INTWAIT | M_ZERO);
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144 TAILQ_INIT(&rp->ap_references);
145 rp->ap_resource = res;
146
147 /* Get the Power Resource object */
148 buf.Length = ACPI_ALLOCATE_BUFFER;
149 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) {
150 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));
151 goto out;
152 }
153 obj = buf.Pointer;
154 if (obj->Type != ACPI_TYPE_POWER) {
155 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
156 "questionable power resource object %s\n",
157 acpi_name(res)));
158 status = AE_TYPE;
159 goto out;
160 }
161 rp->ap_systemlevel = obj->PowerResource.SystemLevel;
162 rp->ap_order = obj->PowerResource.ResourceOrder;
163
164 /* Sort the resource into the list */
165 status = AE_OK;
166 srp = TAILQ_FIRST(&acpi_powerresources);
167 if (srp == NULL || rp->ap_order < srp->ap_order) {
168 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link);
169 goto done;
170 }
171 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) {
172 if (rp->ap_order < srp->ap_order) {
173 TAILQ_INSERT_BEFORE(srp, rp, ap_link);
174 goto done;
175 }
176 }
177 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link);
178
179 done:
180 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
181 "registered power resource %s\n", acpi_name(res)));
182
183 out:
184 if (buf.Pointer != NULL)
185 AcpiOsFree(buf.Pointer);
186 if (ACPI_FAILURE(status) && rp != NULL)
187 free(rp, M_ACPIPWR);
188 return_ACPI_STATUS (status);
189}
190
191/*
192 * Deregister a power resource.
193 */
194static ACPI_STATUS
195acpi_pwr_deregister_resource(ACPI_HANDLE res)
196{
197 struct acpi_powerresource *rp;
198
199 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
200
201 rp = NULL;
202
203 /* Find the resource */
204 if ((rp = acpi_pwr_find_resource(res)) == NULL)
205 return_ACPI_STATUS (AE_BAD_PARAMETER);
206
207 /* Check that there are no consumers referencing this resource */
208 if (TAILQ_FIRST(&rp->ap_references) != NULL)
209 return_ACPI_STATUS (AE_BAD_PARAMETER);
210
211 /* Pull it off the list and free it */
212 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link);
213 free(rp, M_ACPIPWR);
214
215 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n",
216 acpi_name(res)));
217
218 return_ACPI_STATUS (AE_OK);
219}
220
221/*
222 * Register a power consumer.
223 *
224 * It's OK to call this if we already know about the consumer.
225 */
226static ACPI_STATUS
227acpi_pwr_register_consumer(ACPI_HANDLE consumer)
228{
229 struct acpi_powerconsumer *pc;
230
231 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
232
233 /* Check to see whether we know about this consumer already */
234 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL)
235 return_ACPI_STATUS (AE_OK);
236
237 /* Allocate a new power consumer */
8c1d15dd 238 pc = malloc(sizeof(*pc), M_ACPIPWR, M_INTWAIT);
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239 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link);
240 TAILQ_INIT(&pc->ac_references);
241 pc->ac_consumer = consumer;
242
243 /* XXX we should try to find its current state */
244 pc->ac_state = ACPI_STATE_UNKNOWN;
245
246 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n",
247 acpi_name(consumer)));
248
249 return_ACPI_STATUS (AE_OK);
250}
251
252/*
253 * Deregister a power consumer.
254 *
255 * This should only be done once the consumer has been powered off.
256 * (XXX is this correct? Check once implemented)
257 */
258static ACPI_STATUS
259acpi_pwr_deregister_consumer(ACPI_HANDLE consumer)
260{
261 struct acpi_powerconsumer *pc;
262
263 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
264
265 /* Find the consumer */
266 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
267 return_ACPI_STATUS (AE_BAD_PARAMETER);
268
269 /* Make sure the consumer's not referencing anything right now */
270 if (TAILQ_FIRST(&pc->ac_references) != NULL)
271 return_ACPI_STATUS (AE_BAD_PARAMETER);
272
273 /* Pull the consumer off the list and free it */
274 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link);
275
276 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n",
277 acpi_name(consumer)));
278
279 return_ACPI_STATUS (AE_OK);
280}
281
282/*
283 * Set a power consumer to a particular power state.
284 */
285ACPI_STATUS
286acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
287{
288 struct acpi_powerconsumer *pc;
289 struct acpi_powerreference *pr;
290 ACPI_HANDLE method_handle, reslist_handle, pr0_handle;
291 ACPI_BUFFER reslist_buffer;
292 ACPI_OBJECT *reslist_object;
293 ACPI_STATUS status;
294 char *method_name, *reslist_name;
295 int res_changed;
296
297 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
298
299 /* Find the consumer */
300 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
301 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer)))
302 return_ACPI_STATUS (status);
303 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
304 return_ACPI_STATUS (AE_ERROR); /* something very wrong */
305 }
306 }
307
308 /* Check for valid transitions */
309 if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0)
310 return_ACPI_STATUS (AE_BAD_PARAMETER); /* can only go to D0 from D3 */
311
312 /* Find transition mechanism(s) */
313 switch(state) {
314 case ACPI_STATE_D0:
315 method_name = "_PS0";
316 reslist_name = "_PR0";
317 break;
318 case ACPI_STATE_D1:
319 method_name = "_PS1";
320 reslist_name = "_PR1";
321 break;
322 case ACPI_STATE_D2:
323 method_name = "_PS2";
324 reslist_name = "_PR2";
325 break;
326 case ACPI_STATE_D3:
327 method_name = "_PS3";
328 reslist_name = "_PR3";
329 break;
330 default:
331 return_ACPI_STATUS (AE_BAD_PARAMETER);
332 }
333 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n",
334 acpi_name(consumer), pc->ac_state, state));
335
336 /*
337 * Verify that this state is supported, ie. one of method or
338 * reslist must be present. We need to do this before we go
339 * dereferencing resources (since we might be trying to go to
340 * a state we don't support).
341 *
342 * Note that if any states are supported, the device has to
343 * support D0 and D3. It's never an error to try to go to
344 * D0.
345 */
346 reslist_buffer.Pointer = NULL;
347 reslist_object = NULL;
348 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle)))
349 method_handle = NULL;
350 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle)))
351 reslist_handle = NULL;
352 if (reslist_handle == NULL && method_handle == NULL) {
353 if (state == ACPI_STATE_D0) {
354 pc->ac_state = ACPI_STATE_D0;
355 return_ACPI_STATUS (AE_OK);
356 }
357 if (state != ACPI_STATE_D3)
358 goto bad;
359
360 /* Turn off the resources listed in _PR0 to go to D3. */
361 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle)))
362 goto bad;
363 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
364 status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer);
365 if (ACPI_FAILURE(status))
366 goto bad;
367 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
368 if (reslist_object->Type != ACPI_TYPE_PACKAGE ||
369 reslist_object->Package.Count == 0) {
370
371 goto bad;
372 }
373 AcpiOsFree(reslist_buffer.Pointer);
374 reslist_buffer.Pointer = NULL;
375 reslist_object = NULL;
376 }
377
378 /*
379 * Check that we can actually fetch the list of power resources
380 */
381 if (reslist_handle != NULL) {
382 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
383 status = AcpiEvaluateObject(reslist_handle, NULL, NULL,
384 &reslist_buffer);
385 if (ACPI_FAILURE(status)) {
386 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
387 "can't evaluate resource list %s\n",
388 acpi_name(reslist_handle)));
389 goto out;
390 }
391 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
392 if (reslist_object->Type != ACPI_TYPE_PACKAGE) {
393 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
394 "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
395 reslist_object->Type));
396 status = AE_TYPE;
397 goto out;
398 }
399 }
400
401 /*
402 * Now we are ready to switch, so kill off any current power
403 * resource references.
404 */
405 res_changed = 0;
406 while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
407 res_changed = 1;
408 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n",
409 acpi_name(pr->ar_resource->ap_resource)));
410 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink);
411 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink);
412 free(pr, M_ACPIPWR);
413 }
414
415 /*
416 * Add new power resource references, if we have any. Traverse the
417 * package that we got from evaluating reslist_handle, and look up each
418 * of the resources that are referenced.
419 */
420 if (reslist_object != NULL) {
421 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n",
422 reslist_object->Package.Count));
423 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource,
424 pc);
425 res_changed = 1;
426 }
427
428 /*
429 * If we changed anything in the resource list, we need to run a switch
430 * pass now.
431 */
432 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) {
433 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
434 "failed to switch resources from %s to D%d\n",
435 acpi_name(consumer), state));
436
437 /* XXX is this appropriate? Should we return to previous state? */
438 goto out;
439 }
440
441 /* Invoke power state switch method (if present) */
442 if (method_handle != NULL) {
443 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
444 "invoking state transition method %s\n",
445 acpi_name(method_handle)));
446 status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL);
447 if (ACPI_FAILURE(status)) {
448 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n",
449 AcpiFormatException(status)));
450 pc->ac_state = ACPI_STATE_UNKNOWN;
451
452 /* XXX Should we return to previous state? */
453 goto out;
454 }
455 }
456
457 /* Transition was successful */
458 pc->ac_state = state;
459 return_ACPI_STATUS (AE_OK);
460
461 bad:
462 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
463 "attempt to set unsupported state D%d\n", state));
464 status = AE_BAD_PARAMETER;
465
466 out:
467 if (reslist_buffer.Pointer != NULL)
468 AcpiOsFree(reslist_buffer.Pointer);
469 return_ACPI_STATUS (status);
470}
471
472/*
473 * Called to create a reference between a power consumer and a power resource
474 * identified in the object.
475 */
476static void
477acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg)
478{
479 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg;
480 struct acpi_powerreference *pr;
481 struct acpi_powerresource *rp;
482 ACPI_HANDLE res;
483 ACPI_STATUS status;
484
485 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
486
487 /* check the object type */
488 switch (obj->Type) {
489 case ACPI_TYPE_ANY:
490 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "building reference from %s to %s\n",
491 acpi_name(pc->ac_consumer),
492 acpi_name(obj->Reference.Handle)));
493 res = obj->Reference.Handle;
494 break;
495 case ACPI_TYPE_STRING:
496 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "building reference from %s to %s\n",
497 acpi_name(pc->ac_consumer), obj->String.Pointer));
498
499 /* Get the handle of the resource */
500 status = AcpiGetHandle(NULL, obj->String.Pointer, &res);
501 if (ACPI_FAILURE(status)) {
502 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
503 "couldn't find power resource %s\n",
504 obj->String.Pointer));
505 return_VOID;
506 }
507 break;
508 default:
509 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
510 "can't create a power reference for object type %d\n",
511 obj->Type));
512 return_VOID;
513 }
514
515 /* Create/look up the resource */
516 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) {
517 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
518 "couldn't register power resource %s - %s\n",
519 obj->String.Pointer, AcpiFormatException(status)));
520 return_VOID;
521 }
522 if ((rp = acpi_pwr_find_resource(res)) == NULL) {
523 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n"));
524 return_VOID;
525 }
526 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n",
527 acpi_name(rp->ap_resource)));
528
529 /* Create a reference between the consumer and resource */
8c1d15dd 530 pr = malloc(sizeof(*pr), M_ACPIPWR, M_INTWAIT | M_ZERO);
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531 pr->ar_consumer = pc;
532 pr->ar_resource = rp;
533 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink);
534 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink);
535
536 return_VOID;
537}
538
539
540/*
541 * Switch power resources to conform to the desired state.
542 *
543 * Consumers may have modified the power resource list in an arbitrary
544 * fashion; we sweep it in sequence order.
545 */
546static ACPI_STATUS
547acpi_pwr_switch_power(void)
548{
549 struct acpi_powerresource *rp;
550 ACPI_STATUS status;
551 int cur;
552
553 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
554
555 /*
556 * Sweep the list forwards turning things on.
557 */
558 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
559 if (TAILQ_FIRST(&rp->ap_references) == NULL) {
560 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
561 "%s has no references, not turning on\n",
562 acpi_name(rp->ap_resource)));
563 continue;
564 }
565
566 /* We could cache this if we trusted it not to change under us */
567 status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur);
568 if (ACPI_FAILURE(status)) {
569 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
570 acpi_name(rp->ap_resource), status));
571
572 /* XXX is this correct? Always switch if in doubt? */
573 continue;
574 }
575
576 /*
577 * Switch if required. Note that we ignore the result of the switch
578 * effort; we don't know what to do if it fails, so checking wouldn't
579 * help much.
580 */
581 if (cur != ACPI_PWR_ON) {
582 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL);
583 if (ACPI_FAILURE(status)) {
584 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
585 "failed to switch %s on - %s\n",
586 acpi_name(rp->ap_resource),
587 AcpiFormatException(status)));
588 } else {
589 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n",
590 acpi_name(rp->ap_resource)));
591 }
592 } else {
593 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n",
594 acpi_name(rp->ap_resource)));
595 }
596 }
597
598 /* Sweep the list backwards turning things off. */
599 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list,
600 ap_link) {
601
602 if (TAILQ_FIRST(&rp->ap_references) != NULL) {
603 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
604 "%s has references, not turning off\n",
605 acpi_name(rp->ap_resource)));
606 continue;
607 }
608
609 /* We could cache this if we trusted it not to change under us */
610 status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur);
611 if (ACPI_FAILURE(status)) {
612 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
613 acpi_name(rp->ap_resource), status));
614 /* XXX is this correct? Always switch if in doubt? */
615 continue;
616 }
617
618 /*
619 * Switch if required. Note that we ignore the result of the switch
620 * effort; we don't know what to do if it fails, so checking wouldn't
621 * help much.
622 */
623 if (cur != ACPI_PWR_OFF) {
624 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL);
625 if (ACPI_FAILURE(status)) {
626 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
627 "failed to switch %s off - %s\n",
628 acpi_name(rp->ap_resource),
629 AcpiFormatException(status)));
630 } else {
631 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n",
632 acpi_name(rp->ap_resource)));
633 }
634 } else {
635 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n",
636 acpi_name(rp->ap_resource)));
637 }
638 }
639
640 return_ACPI_STATUS (AE_OK);
641}
642
643/*
644 * Find a power resource's control structure.
645 */
646static struct acpi_powerresource *
647acpi_pwr_find_resource(ACPI_HANDLE res)
648{
649 struct acpi_powerresource *rp;
650
651 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
652
653 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
654 if (rp->ap_resource == res)
655 break;
656 }
657
658 return_PTR (rp);
659}
660
661/*
662 * Find a power consumer's control structure.
663 */
664static struct acpi_powerconsumer *
665acpi_pwr_find_consumer(ACPI_HANDLE consumer)
666{
667 struct acpi_powerconsumer *pc;
668
669 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
670
671 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) {
672 if (pc->ac_consumer == consumer)
673 break;
674 }
675
676 return_PTR (pc);
677}