2 * Copyright (c) 2001 Michael Smith
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
25 * __FBSDID("$FreeBSD: src/sys/dev/acpica/acpi_powerres.c,v 1.30.8.1 2009/04/15 03:14:26 kensmith Exp $");
28 #include <sys/cdefs.h>
31 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
37 #include <dev/acpica5/acpivar.h>
40 * ACPI power resource management.
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.
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.
56 MALLOC_DEFINE(M_ACPIPWR
, "acpipwr", "ACPI power resources");
58 /* Hooks for the ACPI CA debugging infrastructure */
59 #define _COMPONENT ACPI_POWERRES
60 ACPI_MODULE_NAME("POWERRES")
62 /* Return values from _STA on a power resource */
63 #define ACPI_PWR_OFF 0
65 #define ACPI_PWR_UNK (-1)
67 /* A relationship between a power resource and a consumer. */
68 struct acpi_powerreference
{
69 struct acpi_powerconsumer
*ar_consumer
;
70 struct acpi_powerresource
*ar_resource
;
71 TAILQ_ENTRY(acpi_powerreference
) ar_rlink
; /* link on resource list */
72 TAILQ_ENTRY(acpi_powerreference
) ar_clink
; /* link on consumer */
75 /* A power-managed device. */
76 struct acpi_powerconsumer
{
77 /* Device which is powered */
78 ACPI_HANDLE ac_consumer
;
80 TAILQ_ENTRY(acpi_powerconsumer
) ac_link
;
81 TAILQ_HEAD(,acpi_powerreference
) ac_references
;
84 /* A power resource. */
85 struct acpi_powerresource
{
86 TAILQ_ENTRY(acpi_powerresource
) ap_link
;
87 TAILQ_HEAD(,acpi_powerreference
) ap_references
;
88 ACPI_HANDLE ap_resource
;
89 ACPI_INTEGER ap_systemlevel
;
90 ACPI_INTEGER ap_order
;
94 static TAILQ_HEAD(acpi_powerresource_list
, acpi_powerresource
)
96 static TAILQ_HEAD(acpi_powerconsumer_list
, acpi_powerconsumer
)
98 ACPI_SERIAL_DECL(powerres
, "ACPI power resources");
100 static ACPI_STATUS
acpi_pwr_register_consumer(ACPI_HANDLE consumer
);
102 static ACPI_STATUS
acpi_pwr_deregister_consumer(ACPI_HANDLE consumer
);
104 static ACPI_STATUS
acpi_pwr_register_resource(ACPI_HANDLE res
);
106 static ACPI_STATUS
acpi_pwr_deregister_resource(ACPI_HANDLE res
);
108 static void acpi_pwr_reference_resource(ACPI_OBJECT
*obj
,
110 static int acpi_pwr_dereference_resource(struct acpi_powerconsumer
112 static ACPI_STATUS
acpi_pwr_switch_power(void);
113 static struct acpi_powerresource
114 *acpi_pwr_find_resource(ACPI_HANDLE res
);
115 static struct acpi_powerconsumer
116 *acpi_pwr_find_consumer(ACPI_HANDLE consumer
);
118 /* Initialise our lists. */
120 acpi_pwr_init(void *junk
)
122 TAILQ_INIT(&acpi_powerresources
);
123 TAILQ_INIT(&acpi_powerconsumers
);
125 // SYSINIT(acpi_powerresource, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_pwr_init, NULL);
128 * Register a power resource.
130 * It's OK to call this if we already know about the resource.
133 acpi_pwr_register_resource(ACPI_HANDLE res
)
138 struct acpi_powerresource
*rp
, *srp
;
140 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
141 ACPI_SERIAL_ASSERT(powerres
);
146 /* Look to see if we know about this resource */
147 if (acpi_pwr_find_resource(res
) != NULL
)
148 return_ACPI_STATUS (AE_OK
); /* already know about it */
150 /* Allocate a new resource */
151 if ((rp
= kmalloc(sizeof(*rp
), M_ACPIPWR
, M_NOWAIT
| M_ZERO
)) == NULL
) {
152 status
= AE_NO_MEMORY
;
155 TAILQ_INIT(&rp
->ap_references
);
156 rp
->ap_resource
= res
;
158 /* Get the Power Resource object */
159 buf
.Length
= ACPI_ALLOCATE_BUFFER
;
160 if (ACPI_FAILURE(status
= AcpiEvaluateObject(res
, NULL
, NULL
, &buf
))) {
161 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "no power resource object\n"));
165 if (obj
->Type
!= ACPI_TYPE_POWER
) {
166 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
167 "questionable power resource object %s\n",
172 rp
->ap_systemlevel
= obj
->PowerResource
.SystemLevel
;
173 rp
->ap_order
= obj
->PowerResource
.ResourceOrder
;
174 rp
->ap_state
= ACPI_PWR_UNK
;
176 /* Sort the resource into the list */
178 srp
= TAILQ_FIRST(&acpi_powerresources
);
179 if (srp
== NULL
|| rp
->ap_order
< srp
->ap_order
) {
180 TAILQ_INSERT_HEAD(&acpi_powerresources
, rp
, ap_link
);
183 TAILQ_FOREACH(srp
, &acpi_powerresources
, ap_link
) {
184 if (rp
->ap_order
< srp
->ap_order
) {
185 TAILQ_INSERT_BEFORE(srp
, rp
, ap_link
);
189 TAILQ_INSERT_TAIL(&acpi_powerresources
, rp
, ap_link
);
192 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
193 "registered power resource %s\n", acpi_name(res
)));
196 if (buf
.Pointer
!= NULL
)
197 AcpiOsFree(buf
.Pointer
);
198 if (ACPI_FAILURE(status
) && rp
!= NULL
)
199 kfree(rp
, M_ACPIPWR
);
200 return_ACPI_STATUS (status
);
205 * Deregister a power resource.
208 acpi_pwr_deregister_resource(ACPI_HANDLE res
)
210 struct acpi_powerresource
*rp
;
212 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
213 ACPI_SERIAL_ASSERT(powerres
);
217 /* Find the resource */
218 if ((rp
= acpi_pwr_find_resource(res
)) == NULL
)
219 return_ACPI_STATUS (AE_BAD_PARAMETER
);
221 /* Check that there are no consumers referencing this resource */
222 if (TAILQ_FIRST(&rp
->ap_references
) != NULL
)
223 return_ACPI_STATUS (AE_BAD_PARAMETER
);
225 /* Pull it off the list and kfree it */
226 TAILQ_REMOVE(&acpi_powerresources
, rp
, ap_link
);
227 kfree(rp
, M_ACPIPWR
);
229 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "deregistered power resource %s\n",
232 return_ACPI_STATUS (AE_OK
);
237 * Register a power consumer.
239 * It's OK to call this if we already know about the consumer.
242 acpi_pwr_register_consumer(ACPI_HANDLE consumer
)
244 struct acpi_powerconsumer
*pc
;
246 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
247 ACPI_SERIAL_ASSERT(powerres
);
249 /* Check to see whether we know about this consumer already */
250 if (acpi_pwr_find_consumer(consumer
) != NULL
)
251 return_ACPI_STATUS (AE_OK
);
253 /* Allocate a new power consumer */
254 if ((pc
= kmalloc(sizeof(*pc
), M_ACPIPWR
, M_NOWAIT
)) == NULL
)
255 return_ACPI_STATUS (AE_NO_MEMORY
);
256 TAILQ_INSERT_HEAD(&acpi_powerconsumers
, pc
, ac_link
);
257 TAILQ_INIT(&pc
->ac_references
);
258 pc
->ac_consumer
= consumer
;
260 /* XXX we should try to find its current state */
261 pc
->ac_state
= ACPI_STATE_UNKNOWN
;
263 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "registered power consumer %s\n",
264 acpi_name(consumer
)));
266 return_ACPI_STATUS (AE_OK
);
271 * Deregister a power consumer.
273 * This should only be done once the consumer has been powered off.
274 * (XXX is this correct? Check once implemented)
277 acpi_pwr_deregister_consumer(ACPI_HANDLE consumer
)
279 struct acpi_powerconsumer
*pc
;
281 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
282 ACPI_SERIAL_ASSERT(powerres
);
284 /* Find the consumer */
285 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
)
286 return_ACPI_STATUS (AE_BAD_PARAMETER
);
288 /* Make sure the consumer's not referencing anything right now */
289 if (TAILQ_FIRST(&pc
->ac_references
) != NULL
)
290 return_ACPI_STATUS (AE_BAD_PARAMETER
);
292 /* Pull the consumer off the list and kfree it */
293 TAILQ_REMOVE(&acpi_powerconsumers
, pc
, ac_link
);
294 kfree(pc
, M_ACPIPWR
);
296 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "deregistered power consumer %s\n",
297 acpi_name(consumer
)));
299 return_ACPI_STATUS (AE_OK
);
304 * Set a power consumer to a particular power state.
307 acpi_pwr_switch_consumer(ACPI_HANDLE consumer
, int state
)
309 struct acpi_powerconsumer
*pc
;
310 ACPI_HANDLE method_handle
, reslist_handle
, pr0_handle
;
311 ACPI_BUFFER reslist_buffer
;
312 ACPI_OBJECT
*reslist_object
;
314 char *method_name
, *reslist_name
;
317 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
319 /* It's never ok to switch a non-existent consumer. */
320 if (consumer
== NULL
)
321 return_ACPI_STATUS (AE_NOT_FOUND
);
322 reslist_buffer
.Pointer
= NULL
;
323 reslist_object
= NULL
;
324 ACPI_SERIAL_BEGIN(powerres
);
326 /* Find the consumer */
327 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
) {
328 if (ACPI_FAILURE(status
= acpi_pwr_register_consumer(consumer
)))
330 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
)
331 panic("acpi added power consumer but can't find it");
334 /* Check for valid transitions. We can only go to D0 from D3. */
335 status
= AE_BAD_PARAMETER
;
336 if (pc
->ac_state
== ACPI_STATE_D3
&& state
!= ACPI_STATE_D0
)
339 /* Find transition mechanism(s) */
342 method_name
= "_PS0";
343 reslist_name
= "_PR0";
346 method_name
= "_PS1";
347 reslist_name
= "_PR1";
350 method_name
= "_PS2";
351 reslist_name
= "_PR2";
354 method_name
= "_PS3";
355 reslist_name
= "_PR3";
360 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "setup to switch %s D%d -> D%d\n",
361 acpi_name(consumer
), pc
->ac_state
, state
));
364 * Verify that this state is supported, ie. one of method or
365 * reslist must be present. We need to do this before we go
366 * dereferencing resources (since we might be trying to go to
367 * a state we don't support).
369 * Note that if any states are supported, the device has to
370 * support D0 and D3. It's never an error to try to go to
373 if (ACPI_FAILURE(AcpiGetHandle(consumer
, method_name
, &method_handle
)))
374 method_handle
= NULL
;
375 if (ACPI_FAILURE(AcpiGetHandle(consumer
, reslist_name
, &reslist_handle
)))
376 reslist_handle
= NULL
;
377 if (reslist_handle
== NULL
&& method_handle
== NULL
) {
378 if (state
== ACPI_STATE_D0
) {
379 pc
->ac_state
= ACPI_STATE_D0
;
383 if (state
!= ACPI_STATE_D3
) {
384 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
385 "attempt to set unsupported state D%d\n", state
));
390 * Turn off the resources listed in _PR0 to go to D3. If there is
391 * no _PR0 method, this object doesn't support ACPI power states.
393 if (ACPI_FAILURE(AcpiGetHandle(consumer
, "_PR0", &pr0_handle
))) {
394 status
= AE_NOT_FOUND
;
395 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
396 "device missing _PR0 (desired state was D%d)\n", state
));
399 reslist_buffer
.Length
= ACPI_ALLOCATE_BUFFER
;
400 status
= AcpiEvaluateObject(pr0_handle
, NULL
, NULL
, &reslist_buffer
);
401 if (ACPI_FAILURE(status
)) {
402 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
403 "can't evaluate _PR0 for device %s, state D%d\n",
404 acpi_name(consumer
), state
));
407 reslist_object
= (ACPI_OBJECT
*)reslist_buffer
.Pointer
;
408 if (!ACPI_PKG_VALID(reslist_object
, 1)) {
409 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
410 "invalid package object for state D%d\n", state
));
414 AcpiOsFree(reslist_buffer
.Pointer
);
415 reslist_buffer
.Pointer
= NULL
;
416 reslist_object
= NULL
;
420 * Check that we can actually fetch the list of power resources
422 if (reslist_handle
!= NULL
) {
423 reslist_buffer
.Length
= ACPI_ALLOCATE_BUFFER
;
424 status
= AcpiEvaluateObject(reslist_handle
, NULL
, NULL
,
426 if (ACPI_FAILURE(status
)) {
427 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
428 "can't evaluate resource list %s\n",
429 acpi_name(reslist_handle
)));
432 reslist_object
= (ACPI_OBJECT
*)reslist_buffer
.Pointer
;
433 if (reslist_object
->Type
!= ACPI_TYPE_PACKAGE
) {
434 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
435 "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
436 reslist_object
->Type
));
443 * Now we are ready to switch, so kill off any current power
444 * resource references.
446 res_changed
= acpi_pwr_dereference_resource(pc
);
449 * Add new power resource references, if we have any. Traverse the
450 * package that we got from evaluating reslist_handle, and look up each
451 * of the resources that are referenced.
453 if (reslist_object
!= NULL
) {
454 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "referencing %d new resources\n",
455 reslist_object
->Package
.Count
));
456 acpi_ForeachPackageObject(reslist_object
, acpi_pwr_reference_resource
,
462 * If we changed anything in the resource list, we need to run a switch
465 if (ACPI_FAILURE(status
= acpi_pwr_switch_power())) {
466 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
467 "failed to switch resources from %s to D%d\n",
468 acpi_name(consumer
), state
));
470 /* XXX is this appropriate? Should we return to previous state? */
474 /* Invoke power state switch method (if present) */
475 if (method_handle
!= NULL
) {
476 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
477 "invoking state transition method %s\n",
478 acpi_name(method_handle
)));
479 status
= AcpiEvaluateObject(method_handle
, NULL
, NULL
, NULL
);
480 if (ACPI_FAILURE(status
)) {
481 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "failed to set state - %s\n",
482 AcpiFormatException(status
)));
483 pc
->ac_state
= ACPI_STATE_UNKNOWN
;
485 /* XXX Should we return to previous state? */
490 /* Transition was successful */
491 pc
->ac_state
= state
;
495 ACPI_SERIAL_END(powerres
);
496 if (reslist_buffer
.Pointer
!= NULL
)
497 AcpiOsFree(reslist_buffer
.Pointer
);
498 return_ACPI_STATUS (status
);
501 /* Enable or disable a power resource for wake */
503 acpi_pwr_wake_enable(ACPI_HANDLE consumer
, int enable
)
506 struct acpi_powerconsumer
*pc
;
507 struct acpi_prw_data prw
;
510 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
512 if (consumer
== NULL
)
513 return (AE_BAD_PARAMETER
);
515 ACPI_SERIAL_BEGIN(powerres
);
516 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
) {
517 if (ACPI_FAILURE(status
= acpi_pwr_register_consumer(consumer
)))
519 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
)
520 panic("acpi wake added power consumer but can't find it");
524 if (acpi_parse_prw(consumer
, &prw
) != 0)
526 for (i
= 0; i
< prw
.power_res_count
; i
++)
528 acpi_pwr_reference_resource(&prw
.power_res
[i
], pc
);
530 acpi_pwr_dereference_resource(pc
);
532 if (prw
.power_res_count
> 0)
533 acpi_pwr_switch_power();
536 ACPI_SERIAL_END(powerres
);
541 * Called to create a reference between a power consumer and a power resource
542 * identified in the object.
545 acpi_pwr_reference_resource(ACPI_OBJECT
*obj
, void *arg
)
547 struct acpi_powerconsumer
*pc
= (struct acpi_powerconsumer
*)arg
;
548 struct acpi_powerreference
*pr
;
549 struct acpi_powerresource
*rp
;
553 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
554 ACPI_SERIAL_ASSERT(powerres
);
556 res
= acpi_GetReference(NULL
, obj
);
558 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
559 "can't create a power reference for object type %d\n",
564 /* Create/look up the resource */
565 if (ACPI_FAILURE(status
= acpi_pwr_register_resource(res
))) {
566 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
567 "couldn't register power resource %s - %s\n",
568 obj
->String
.Pointer
, AcpiFormatException(status
)));
571 if ((rp
= acpi_pwr_find_resource(res
)) == NULL
) {
572 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "power resource list corrupted\n"));
575 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "found power resource %s\n",
576 acpi_name(rp
->ap_resource
)));
578 /* Create a reference between the consumer and resource */
579 if ((pr
= kmalloc(sizeof(*pr
), M_ACPIPWR
, M_NOWAIT
| M_ZERO
)) == NULL
) {
580 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
581 "allocation failed for a power consumer reference\n"));
584 pr
->ar_consumer
= pc
;
585 pr
->ar_resource
= rp
;
586 TAILQ_INSERT_TAIL(&pc
->ac_references
, pr
, ar_clink
);
587 TAILQ_INSERT_TAIL(&rp
->ap_references
, pr
, ar_rlink
);
593 acpi_pwr_dereference_resource(struct acpi_powerconsumer
*pc
)
595 struct acpi_powerreference
*pr
;
598 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
599 ACPI_SERIAL_ASSERT(powerres
);
602 while ((pr
= TAILQ_FIRST(&pc
->ac_references
)) != NULL
) {
603 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "removing reference to %s\n",
604 acpi_name(pr
->ar_resource
->ap_resource
)));
605 TAILQ_REMOVE(&pr
->ar_resource
->ap_references
, pr
, ar_rlink
);
606 TAILQ_REMOVE(&pc
->ac_references
, pr
, ar_clink
);
607 kfree(pr
, M_ACPIPWR
);
615 * Switch power resources to conform to the desired state.
617 * Consumers may have modified the power resource list in an arbitrary
618 * fashion; we sweep it in sequence order.
621 acpi_pwr_switch_power(void)
623 struct acpi_powerresource
*rp
;
627 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
628 ACPI_SERIAL_ASSERT(powerres
);
631 * Sweep the list forwards turning things on.
633 TAILQ_FOREACH(rp
, &acpi_powerresources
, ap_link
) {
634 if (TAILQ_FIRST(&rp
->ap_references
) == NULL
) {
635 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
636 "%s has no references, not turning on\n",
637 acpi_name(rp
->ap_resource
)));
641 /* We could cache this if we trusted it not to change under us */
642 status
= acpi_GetInteger(rp
->ap_resource
, "_STA", &cur
);
643 if (ACPI_FAILURE(status
)) {
644 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "can't get status of %s - %d\n",
645 acpi_name(rp
->ap_resource
), status
));
646 /* XXX is this correct? Always switch if in doubt? */
648 } else if (rp
->ap_state
== ACPI_PWR_UNK
)
652 * Switch if required. Note that we ignore the result of the switch
653 * effort; we don't know what to do if it fails, so checking wouldn't
656 if (rp
->ap_state
!= ACPI_PWR_ON
) {
657 status
= AcpiEvaluateObject(rp
->ap_resource
, "_ON", NULL
, NULL
);
658 if (ACPI_FAILURE(status
)) {
659 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
660 "failed to switch %s on - %s\n",
661 acpi_name(rp
->ap_resource
),
662 AcpiFormatException(status
)));
664 rp
->ap_state
= ACPI_PWR_ON
;
665 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "switched %s on\n",
666 acpi_name(rp
->ap_resource
)));
669 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "%s is already on\n",
670 acpi_name(rp
->ap_resource
)));
674 /* Sweep the list backwards turning things off. */
675 TAILQ_FOREACH_REVERSE(rp
, &acpi_powerresources
, acpi_powerresource_list
,
678 if (TAILQ_FIRST(&rp
->ap_references
) != NULL
) {
679 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
680 "%s has references, not turning off\n",
681 acpi_name(rp
->ap_resource
)));
685 /* We could cache this if we trusted it not to change under us */
686 status
= acpi_GetInteger(rp
->ap_resource
, "_STA", &cur
);
687 if (ACPI_FAILURE(status
)) {
688 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "can't get status of %s - %d\n",
689 acpi_name(rp
->ap_resource
), status
));
690 /* XXX is this correct? Always switch if in doubt? */
692 } else if (rp
->ap_state
== ACPI_PWR_UNK
)
696 * Switch if required. Note that we ignore the result of the switch
697 * effort; we don't know what to do if it fails, so checking wouldn't
700 if (rp
->ap_state
!= ACPI_PWR_OFF
) {
701 status
= AcpiEvaluateObject(rp
->ap_resource
, "_OFF", NULL
, NULL
);
702 if (ACPI_FAILURE(status
)) {
703 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
704 "failed to switch %s off - %s\n",
705 acpi_name(rp
->ap_resource
),
706 AcpiFormatException(status
)));
708 rp
->ap_state
= ACPI_PWR_OFF
;
709 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "switched %s off\n",
710 acpi_name(rp
->ap_resource
)));
713 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "%s is already off\n",
714 acpi_name(rp
->ap_resource
)));
718 return_ACPI_STATUS (AE_OK
);
722 * Find a power resource's control structure.
724 static struct acpi_powerresource
*
725 acpi_pwr_find_resource(ACPI_HANDLE res
)
727 struct acpi_powerresource
*rp
;
729 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
730 ACPI_SERIAL_ASSERT(powerres
);
732 TAILQ_FOREACH(rp
, &acpi_powerresources
, ap_link
) {
733 if (rp
->ap_resource
== res
)
741 * Find a power consumer's control structure.
743 static struct acpi_powerconsumer
*
744 acpi_pwr_find_consumer(ACPI_HANDLE consumer
)
746 struct acpi_powerconsumer
*pc
;
748 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
749 ACPI_SERIAL_ASSERT(powerres
);
751 TAILQ_FOREACH(pc
, &acpi_powerconsumers
, ac_link
) {
752 if (pc
->ac_consumer
== consumer
)