Bring in the FreeBSD-5 ACPICA code as a module. Note: not hooked up yet,
[dragonfly.git] / sys / dev / acpica5 / acpi_powerres.c
CommitLineData
5ed44076
MD
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 $
27 * $DragonFly: src/sys/dev/acpica5/acpi_powerres.c,v 1.1 2004/02/21 06:48:08 dillon Exp $
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 */
143 if ((rp = malloc(sizeof(*rp), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) {
144 status = AE_NO_MEMORY;
145 goto out;
146 }
147 TAILQ_INIT(&rp->ap_references);
148 rp->ap_resource = res;
149
150 /* Get the Power Resource object */
151 buf.Length = ACPI_ALLOCATE_BUFFER;
152 if (ACPI_FAILURE(status = AcpiEvaluateObject(res, NULL, NULL, &buf))) {
153 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));
154 goto out;
155 }
156 obj = buf.Pointer;
157 if (obj->Type != ACPI_TYPE_POWER) {
158 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
159 "questionable power resource object %s\n",
160 acpi_name(res)));
161 status = AE_TYPE;
162 goto out;
163 }
164 rp->ap_systemlevel = obj->PowerResource.SystemLevel;
165 rp->ap_order = obj->PowerResource.ResourceOrder;
166
167 /* Sort the resource into the list */
168 status = AE_OK;
169 srp = TAILQ_FIRST(&acpi_powerresources);
170 if (srp == NULL || rp->ap_order < srp->ap_order) {
171 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link);
172 goto done;
173 }
174 TAILQ_FOREACH(srp, &acpi_powerresources, ap_link) {
175 if (rp->ap_order < srp->ap_order) {
176 TAILQ_INSERT_BEFORE(srp, rp, ap_link);
177 goto done;
178 }
179 }
180 TAILQ_INSERT_TAIL(&acpi_powerresources, rp, ap_link);
181
182 done:
183 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
184 "registered power resource %s\n", acpi_name(res)));
185
186 out:
187 if (buf.Pointer != NULL)
188 AcpiOsFree(buf.Pointer);
189 if (ACPI_FAILURE(status) && rp != NULL)
190 free(rp, M_ACPIPWR);
191 return_ACPI_STATUS (status);
192}
193
194/*
195 * Deregister a power resource.
196 */
197static ACPI_STATUS
198acpi_pwr_deregister_resource(ACPI_HANDLE res)
199{
200 struct acpi_powerresource *rp;
201
202 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
203
204 rp = NULL;
205
206 /* Find the resource */
207 if ((rp = acpi_pwr_find_resource(res)) == NULL)
208 return_ACPI_STATUS (AE_BAD_PARAMETER);
209
210 /* Check that there are no consumers referencing this resource */
211 if (TAILQ_FIRST(&rp->ap_references) != NULL)
212 return_ACPI_STATUS (AE_BAD_PARAMETER);
213
214 /* Pull it off the list and free it */
215 TAILQ_REMOVE(&acpi_powerresources, rp, ap_link);
216 free(rp, M_ACPIPWR);
217
218 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n",
219 acpi_name(res)));
220
221 return_ACPI_STATUS (AE_OK);
222}
223
224/*
225 * Register a power consumer.
226 *
227 * It's OK to call this if we already know about the consumer.
228 */
229static ACPI_STATUS
230acpi_pwr_register_consumer(ACPI_HANDLE consumer)
231{
232 struct acpi_powerconsumer *pc;
233
234 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
235
236 /* Check to see whether we know about this consumer already */
237 if ((pc = acpi_pwr_find_consumer(consumer)) != NULL)
238 return_ACPI_STATUS (AE_OK);
239
240 /* Allocate a new power consumer */
241 if ((pc = malloc(sizeof(*pc), M_ACPIPWR, M_NOWAIT)) == NULL)
242 return_ACPI_STATUS (AE_NO_MEMORY);
243 TAILQ_INSERT_HEAD(&acpi_powerconsumers, pc, ac_link);
244 TAILQ_INIT(&pc->ac_references);
245 pc->ac_consumer = consumer;
246
247 /* XXX we should try to find its current state */
248 pc->ac_state = ACPI_STATE_UNKNOWN;
249
250 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n",
251 acpi_name(consumer)));
252
253 return_ACPI_STATUS (AE_OK);
254}
255
256/*
257 * Deregister a power consumer.
258 *
259 * This should only be done once the consumer has been powered off.
260 * (XXX is this correct? Check once implemented)
261 */
262static ACPI_STATUS
263acpi_pwr_deregister_consumer(ACPI_HANDLE consumer)
264{
265 struct acpi_powerconsumer *pc;
266
267 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
268
269 /* Find the consumer */
270 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL)
271 return_ACPI_STATUS (AE_BAD_PARAMETER);
272
273 /* Make sure the consumer's not referencing anything right now */
274 if (TAILQ_FIRST(&pc->ac_references) != NULL)
275 return_ACPI_STATUS (AE_BAD_PARAMETER);
276
277 /* Pull the consumer off the list and free it */
278 TAILQ_REMOVE(&acpi_powerconsumers, pc, ac_link);
279
280 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n",
281 acpi_name(consumer)));
282
283 return_ACPI_STATUS (AE_OK);
284}
285
286/*
287 * Set a power consumer to a particular power state.
288 */
289ACPI_STATUS
290acpi_pwr_switch_consumer(ACPI_HANDLE consumer, int state)
291{
292 struct acpi_powerconsumer *pc;
293 struct acpi_powerreference *pr;
294 ACPI_HANDLE method_handle, reslist_handle, pr0_handle;
295 ACPI_BUFFER reslist_buffer;
296 ACPI_OBJECT *reslist_object;
297 ACPI_STATUS status;
298 char *method_name, *reslist_name;
299 int res_changed;
300
301 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
302
303 /* Find the consumer */
304 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
305 if (ACPI_FAILURE(status = acpi_pwr_register_consumer(consumer)))
306 return_ACPI_STATUS (status);
307 if ((pc = acpi_pwr_find_consumer(consumer)) == NULL) {
308 return_ACPI_STATUS (AE_ERROR); /* something very wrong */
309 }
310 }
311
312 /* Check for valid transitions */
313 if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0)
314 return_ACPI_STATUS (AE_BAD_PARAMETER); /* can only go to D0 from D3 */
315
316 /* Find transition mechanism(s) */
317 switch(state) {
318 case ACPI_STATE_D0:
319 method_name = "_PS0";
320 reslist_name = "_PR0";
321 break;
322 case ACPI_STATE_D1:
323 method_name = "_PS1";
324 reslist_name = "_PR1";
325 break;
326 case ACPI_STATE_D2:
327 method_name = "_PS2";
328 reslist_name = "_PR2";
329 break;
330 case ACPI_STATE_D3:
331 method_name = "_PS3";
332 reslist_name = "_PR3";
333 break;
334 default:
335 return_ACPI_STATUS (AE_BAD_PARAMETER);
336 }
337 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n",
338 acpi_name(consumer), pc->ac_state, state));
339
340 /*
341 * Verify that this state is supported, ie. one of method or
342 * reslist must be present. We need to do this before we go
343 * dereferencing resources (since we might be trying to go to
344 * a state we don't support).
345 *
346 * Note that if any states are supported, the device has to
347 * support D0 and D3. It's never an error to try to go to
348 * D0.
349 */
350 reslist_buffer.Pointer = NULL;
351 reslist_object = NULL;
352 if (ACPI_FAILURE(AcpiGetHandle(consumer, method_name, &method_handle)))
353 method_handle = NULL;
354 if (ACPI_FAILURE(AcpiGetHandle(consumer, reslist_name, &reslist_handle)))
355 reslist_handle = NULL;
356 if (reslist_handle == NULL && method_handle == NULL) {
357 if (state == ACPI_STATE_D0) {
358 pc->ac_state = ACPI_STATE_D0;
359 return_ACPI_STATUS (AE_OK);
360 }
361 if (state != ACPI_STATE_D3)
362 goto bad;
363
364 /* Turn off the resources listed in _PR0 to go to D3. */
365 if (ACPI_FAILURE(AcpiGetHandle(consumer, "_PR0", &pr0_handle)))
366 goto bad;
367 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
368 status = AcpiEvaluateObject(pr0_handle, NULL, NULL, &reslist_buffer);
369 if (ACPI_FAILURE(status))
370 goto bad;
371 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
372 if (reslist_object->Type != ACPI_TYPE_PACKAGE ||
373 reslist_object->Package.Count == 0) {
374
375 goto bad;
376 }
377 AcpiOsFree(reslist_buffer.Pointer);
378 reslist_buffer.Pointer = NULL;
379 reslist_object = NULL;
380 }
381
382 /*
383 * Check that we can actually fetch the list of power resources
384 */
385 if (reslist_handle != NULL) {
386 reslist_buffer.Length = ACPI_ALLOCATE_BUFFER;
387 status = AcpiEvaluateObject(reslist_handle, NULL, NULL,
388 &reslist_buffer);
389 if (ACPI_FAILURE(status)) {
390 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
391 "can't evaluate resource list %s\n",
392 acpi_name(reslist_handle)));
393 goto out;
394 }
395 reslist_object = (ACPI_OBJECT *)reslist_buffer.Pointer;
396 if (reslist_object->Type != ACPI_TYPE_PACKAGE) {
397 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
398 "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
399 reslist_object->Type));
400 status = AE_TYPE;
401 goto out;
402 }
403 }
404
405 /*
406 * Now we are ready to switch, so kill off any current power
407 * resource references.
408 */
409 res_changed = 0;
410 while((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {
411 res_changed = 1;
412 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "removing reference to %s\n",
413 acpi_name(pr->ar_resource->ap_resource)));
414 TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink);
415 TAILQ_REMOVE(&pc->ac_references, pr, ar_clink);
416 free(pr, M_ACPIPWR);
417 }
418
419 /*
420 * Add new power resource references, if we have any. Traverse the
421 * package that we got from evaluating reslist_handle, and look up each
422 * of the resources that are referenced.
423 */
424 if (reslist_object != NULL) {
425 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "referencing %d new resources\n",
426 reslist_object->Package.Count));
427 acpi_ForeachPackageObject(reslist_object, acpi_pwr_reference_resource,
428 pc);
429 res_changed = 1;
430 }
431
432 /*
433 * If we changed anything in the resource list, we need to run a switch
434 * pass now.
435 */
436 if (ACPI_FAILURE(status = acpi_pwr_switch_power())) {
437 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
438 "failed to switch resources from %s to D%d\n",
439 acpi_name(consumer), state));
440
441 /* XXX is this appropriate? Should we return to previous state? */
442 goto out;
443 }
444
445 /* Invoke power state switch method (if present) */
446 if (method_handle != NULL) {
447 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
448 "invoking state transition method %s\n",
449 acpi_name(method_handle)));
450 status = AcpiEvaluateObject(method_handle, NULL, NULL, NULL);
451 if (ACPI_FAILURE(status)) {
452 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n",
453 AcpiFormatException(status)));
454 pc->ac_state = ACPI_STATE_UNKNOWN;
455
456 /* XXX Should we return to previous state? */
457 goto out;
458 }
459 }
460
461 /* Transition was successful */
462 pc->ac_state = state;
463 return_ACPI_STATUS (AE_OK);
464
465 bad:
466 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
467 "attempt to set unsupported state D%d\n", state));
468 status = AE_BAD_PARAMETER;
469
470 out:
471 if (reslist_buffer.Pointer != NULL)
472 AcpiOsFree(reslist_buffer.Pointer);
473 return_ACPI_STATUS (status);
474}
475
476/*
477 * Called to create a reference between a power consumer and a power resource
478 * identified in the object.
479 */
480static void
481acpi_pwr_reference_resource(ACPI_OBJECT *obj, void *arg)
482{
483 struct acpi_powerconsumer *pc = (struct acpi_powerconsumer *)arg;
484 struct acpi_powerreference *pr;
485 struct acpi_powerresource *rp;
486 ACPI_HANDLE res;
487 ACPI_STATUS status;
488
489 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
490
491 /* check the object type */
492 switch (obj->Type) {
493 case ACPI_TYPE_ANY:
494 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "building reference from %s to %s\n",
495 acpi_name(pc->ac_consumer),
496 acpi_name(obj->Reference.Handle)));
497 res = obj->Reference.Handle;
498 break;
499 case ACPI_TYPE_STRING:
500 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "building reference from %s to %s\n",
501 acpi_name(pc->ac_consumer), obj->String.Pointer));
502
503 /* Get the handle of the resource */
504 status = AcpiGetHandle(NULL, obj->String.Pointer, &res);
505 if (ACPI_FAILURE(status)) {
506 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
507 "couldn't find power resource %s\n",
508 obj->String.Pointer));
509 return_VOID;
510 }
511 break;
512 default:
513 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
514 "can't create a power reference for object type %d\n",
515 obj->Type));
516 return_VOID;
517 }
518
519 /* Create/look up the resource */
520 if (ACPI_FAILURE(status = acpi_pwr_register_resource(res))) {
521 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
522 "couldn't register power resource %s - %s\n",
523 obj->String.Pointer, AcpiFormatException(status)));
524 return_VOID;
525 }
526 if ((rp = acpi_pwr_find_resource(res)) == NULL) {
527 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n"));
528 return_VOID;
529 }
530 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n",
531 acpi_name(rp->ap_resource)));
532
533 /* Create a reference between the consumer and resource */
534 if ((pr = malloc(sizeof(*pr), M_ACPIPWR, M_NOWAIT | M_ZERO)) == NULL) {
535 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
536 "allocation failed for a power consumer reference\n"));
537 return_VOID;
538 }
539 pr->ar_consumer = pc;
540 pr->ar_resource = rp;
541 TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink);
542 TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink);
543
544 return_VOID;
545}
546
547
548/*
549 * Switch power resources to conform to the desired state.
550 *
551 * Consumers may have modified the power resource list in an arbitrary
552 * fashion; we sweep it in sequence order.
553 */
554static ACPI_STATUS
555acpi_pwr_switch_power(void)
556{
557 struct acpi_powerresource *rp;
558 ACPI_STATUS status;
559 int cur;
560
561 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
562
563 /*
564 * Sweep the list forwards turning things on.
565 */
566 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
567 if (TAILQ_FIRST(&rp->ap_references) == NULL) {
568 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
569 "%s has no references, not turning on\n",
570 acpi_name(rp->ap_resource)));
571 continue;
572 }
573
574 /* We could cache this if we trusted it not to change under us */
575 status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur);
576 if (ACPI_FAILURE(status)) {
577 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
578 acpi_name(rp->ap_resource), status));
579
580 /* XXX is this correct? Always switch if in doubt? */
581 continue;
582 }
583
584 /*
585 * Switch if required. Note that we ignore the result of the switch
586 * effort; we don't know what to do if it fails, so checking wouldn't
587 * help much.
588 */
589 if (cur != ACPI_PWR_ON) {
590 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL);
591 if (ACPI_FAILURE(status)) {
592 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
593 "failed to switch %s on - %s\n",
594 acpi_name(rp->ap_resource),
595 AcpiFormatException(status)));
596 } else {
597 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n",
598 acpi_name(rp->ap_resource)));
599 }
600 } else {
601 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n",
602 acpi_name(rp->ap_resource)));
603 }
604 }
605
606 /* Sweep the list backwards turning things off. */
607 TAILQ_FOREACH_REVERSE(rp, &acpi_powerresources, acpi_powerresource_list,
608 ap_link) {
609
610 if (TAILQ_FIRST(&rp->ap_references) != NULL) {
611 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
612 "%s has references, not turning off\n",
613 acpi_name(rp->ap_resource)));
614 continue;
615 }
616
617 /* We could cache this if we trusted it not to change under us */
618 status = acpi_EvaluateInteger(rp->ap_resource, "_STA", &cur);
619 if (ACPI_FAILURE(status)) {
620 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
621 acpi_name(rp->ap_resource), status));
622 /* XXX is this correct? Always switch if in doubt? */
623 continue;
624 }
625
626 /*
627 * Switch if required. Note that we ignore the result of the switch
628 * effort; we don't know what to do if it fails, so checking wouldn't
629 * help much.
630 */
631 if (cur != ACPI_PWR_OFF) {
632 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL);
633 if (ACPI_FAILURE(status)) {
634 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
635 "failed to switch %s off - %s\n",
636 acpi_name(rp->ap_resource),
637 AcpiFormatException(status)));
638 } else {
639 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n",
640 acpi_name(rp->ap_resource)));
641 }
642 } else {
643 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n",
644 acpi_name(rp->ap_resource)));
645 }
646 }
647
648 return_ACPI_STATUS (AE_OK);
649}
650
651/*
652 * Find a power resource's control structure.
653 */
654static struct acpi_powerresource *
655acpi_pwr_find_resource(ACPI_HANDLE res)
656{
657 struct acpi_powerresource *rp;
658
659 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
660
661 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
662 if (rp->ap_resource == res)
663 break;
664 }
665
666 return_PTR (rp);
667}
668
669/*
670 * Find a power consumer's control structure.
671 */
672static struct acpi_powerconsumer *
673acpi_pwr_find_consumer(ACPI_HANDLE consumer)
674{
675 struct acpi_powerconsumer *pc;
676
677 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
678
679 TAILQ_FOREACH(pc, &acpi_powerconsumers, ac_link) {
680 if (pc->ac_consumer == consumer)
681 break;
682 }
683
684 return_PTR (pc);
685}