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
26 * $FreeBSD: src/sys/dev/acpica/acpi_powerres.c,v 1.22 2004/04/14 17:58:19 njl Exp $
27 * $DragonFly: src/sys/dev/acpica5/acpi_powerres.c,v 1.5 2007/04/30 07:18:47 dillon Exp $
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.
58 MALLOC_DEFINE(M_ACPIPWR
, "acpipwr", "ACPI power resources");
60 /* Hooks for the ACPI CA debugging infrastructure */
61 #define _COMPONENT ACPI_POWERRES
62 ACPI_MODULE_NAME("POWERRES")
64 /* Return values from _STA on a power resource */
65 #define ACPI_PWR_OFF 0
68 /* A relationship between a power resource and a consumer. */
69 struct 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 */
76 /* A power-managed device. */
77 struct acpi_powerconsumer
{
78 /* Device which is powered */
79 ACPI_HANDLE ac_consumer
;
81 TAILQ_ENTRY(acpi_powerconsumer
) ac_link
;
82 TAILQ_HEAD(,acpi_powerreference
) ac_references
;
85 /* A power resource. */
86 struct 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
;
94 static TAILQ_HEAD(acpi_powerresource_list
, acpi_powerresource
)
96 static TAILQ_HEAD(acpi_powerconsumer_list
, acpi_powerconsumer
)
99 static ACPI_STATUS
acpi_pwr_register_consumer(ACPI_HANDLE consumer
);
101 static ACPI_STATUS
acpi_pwr_deregister_consumer(ACPI_HANDLE consumer
);
103 static ACPI_STATUS
acpi_pwr_register_resource(ACPI_HANDLE res
);
105 static ACPI_STATUS
acpi_pwr_deregister_resource(ACPI_HANDLE res
);
107 static void acpi_pwr_reference_resource(ACPI_OBJECT
*obj
,
109 static ACPI_STATUS
acpi_pwr_switch_power(void);
110 static struct acpi_powerresource
111 *acpi_pwr_find_resource(ACPI_HANDLE res
);
112 static struct acpi_powerconsumer
113 *acpi_pwr_find_consumer(ACPI_HANDLE consumer
);
115 /* Initialise our lists. */
117 acpi_pwr_init(void *junk
)
119 TAILQ_INIT(&acpi_powerresources
);
120 TAILQ_INIT(&acpi_powerconsumers
);
122 SYSINIT(acpi_powerresource
, SI_BOOT1_LOCK
, SI_ORDER_ANY
,
123 acpi_pwr_init
, NULL
);
126 * Register a power resource.
128 * It's OK to call this if we already know about the resource.
131 acpi_pwr_register_resource(ACPI_HANDLE res
)
136 struct acpi_powerresource
*rp
, *srp
;
138 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
143 /* Look to see if we know about this resource */
144 if (acpi_pwr_find_resource(res
) != NULL
)
145 return_ACPI_STATUS (AE_OK
); /* already know about it */
147 /* Allocate a new resource */
148 rp
= kmalloc(sizeof(*rp
), M_ACPIPWR
, M_INTWAIT
| M_ZERO
);
149 TAILQ_INIT(&rp
->ap_references
);
150 rp
->ap_resource
= res
;
152 /* Get the Power Resource object */
153 buf
.Length
= ACPI_ALLOCATE_BUFFER
;
154 if (ACPI_FAILURE(status
= AcpiEvaluateObject(res
, NULL
, NULL
, &buf
))) {
155 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "no power resource object\n"));
159 if (obj
->Type
!= ACPI_TYPE_POWER
) {
160 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
161 "questionable power resource object %s\n",
166 rp
->ap_systemlevel
= obj
->PowerResource
.SystemLevel
;
167 rp
->ap_order
= obj
->PowerResource
.ResourceOrder
;
169 /* Sort the resource into the list */
171 srp
= TAILQ_FIRST(&acpi_powerresources
);
172 if (srp
== NULL
|| rp
->ap_order
< srp
->ap_order
) {
173 TAILQ_INSERT_HEAD(&acpi_powerresources
, rp
, ap_link
);
176 TAILQ_FOREACH(srp
, &acpi_powerresources
, ap_link
) {
177 if (rp
->ap_order
< srp
->ap_order
) {
178 TAILQ_INSERT_BEFORE(srp
, rp
, ap_link
);
182 TAILQ_INSERT_TAIL(&acpi_powerresources
, rp
, ap_link
);
185 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
186 "registered power resource %s\n", acpi_name(res
)));
189 if (buf
.Pointer
!= NULL
)
190 AcpiOsFree(buf
.Pointer
);
191 if (ACPI_FAILURE(status
) && rp
!= NULL
)
192 kfree(rp
, M_ACPIPWR
);
193 return_ACPI_STATUS (status
);
198 * Deregister a power resource.
201 acpi_pwr_deregister_resource(ACPI_HANDLE res
)
203 struct acpi_powerresource
*rp
;
205 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
209 /* Find the resource */
210 if ((rp
= acpi_pwr_find_resource(res
)) == NULL
)
211 return_ACPI_STATUS (AE_BAD_PARAMETER
);
213 /* Check that there are no consumers referencing this resource */
214 if (TAILQ_FIRST(&rp
->ap_references
) != NULL
)
215 return_ACPI_STATUS (AE_BAD_PARAMETER
);
217 /* Pull it off the list and free it */
218 TAILQ_REMOVE(&acpi_powerresources
, rp
, ap_link
);
219 kfree(rp
, M_ACPIPWR
);
221 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "deregistered power resource %s\n",
224 return_ACPI_STATUS (AE_OK
);
229 * Register a power consumer.
231 * It's OK to call this if we already know about the consumer.
234 acpi_pwr_register_consumer(ACPI_HANDLE consumer
)
236 struct acpi_powerconsumer
*pc
;
238 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
240 /* Check to see whether we know about this consumer already */
241 if ((pc
= acpi_pwr_find_consumer(consumer
)) != NULL
)
242 return_ACPI_STATUS (AE_OK
);
244 /* Allocate a new power consumer */
245 pc
= kmalloc(sizeof(*pc
), M_ACPIPWR
, M_INTWAIT
);
246 TAILQ_INSERT_HEAD(&acpi_powerconsumers
, pc
, ac_link
);
247 TAILQ_INIT(&pc
->ac_references
);
248 pc
->ac_consumer
= consumer
;
250 /* XXX we should try to find its current state */
251 pc
->ac_state
= ACPI_STATE_UNKNOWN
;
253 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "registered power consumer %s\n",
254 acpi_name(consumer
)));
256 return_ACPI_STATUS (AE_OK
);
261 * Deregister a power consumer.
263 * This should only be done once the consumer has been powered off.
264 * (XXX is this correct? Check once implemented)
267 acpi_pwr_deregister_consumer(ACPI_HANDLE consumer
)
269 struct acpi_powerconsumer
*pc
;
271 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
273 /* Find the consumer */
274 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
)
275 return_ACPI_STATUS (AE_BAD_PARAMETER
);
277 /* Make sure the consumer's not referencing anything right now */
278 if (TAILQ_FIRST(&pc
->ac_references
) != NULL
)
279 return_ACPI_STATUS (AE_BAD_PARAMETER
);
281 /* Pull the consumer off the list and free it */
282 TAILQ_REMOVE(&acpi_powerconsumers
, pc
, ac_link
);
284 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "deregistered power consumer %s\n",
285 acpi_name(consumer
)));
287 return_ACPI_STATUS (AE_OK
);
292 * Set a power consumer to a particular power state.
295 acpi_pwr_switch_consumer(ACPI_HANDLE consumer
, int state
)
297 struct acpi_powerconsumer
*pc
;
298 struct acpi_powerreference
*pr
;
299 ACPI_HANDLE method_handle
, reslist_handle
, pr0_handle
;
300 ACPI_BUFFER reslist_buffer
;
301 ACPI_OBJECT
*reslist_object
;
303 char *method_name
, *reslist_name
;
306 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
308 /* It's never ok to switch a non-existent consumer. */
309 if (consumer
== NULL
)
310 return_ACPI_STATUS (AE_NOT_FOUND
);
312 /* Find the consumer */
313 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
) {
314 if (ACPI_FAILURE(status
= acpi_pwr_register_consumer(consumer
)))
315 return_ACPI_STATUS (status
);
316 if ((pc
= acpi_pwr_find_consumer(consumer
)) == NULL
) {
317 return_ACPI_STATUS (AE_ERROR
); /* something very wrong */
321 /* Check for valid transitions */
322 if (pc
->ac_state
== ACPI_STATE_D3
&& state
!= ACPI_STATE_D0
)
323 return_ACPI_STATUS (AE_BAD_PARAMETER
); /* can only go to D0 from D3 */
325 /* Find transition mechanism(s) */
328 method_name
= "_PS0";
329 reslist_name
= "_PR0";
332 method_name
= "_PS1";
333 reslist_name
= "_PR1";
336 method_name
= "_PS2";
337 reslist_name
= "_PR2";
340 method_name
= "_PS3";
341 reslist_name
= "_PR3";
344 return_ACPI_STATUS (AE_BAD_PARAMETER
);
346 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "setup to switch %s D%d -> D%d\n",
347 acpi_name(consumer
), pc
->ac_state
, state
));
350 * Verify that this state is supported, ie. one of method or
351 * reslist must be present. We need to do this before we go
352 * dereferencing resources (since we might be trying to go to
353 * a state we don't support).
355 * Note that if any states are supported, the device has to
356 * support D0 and D3. It's never an error to try to go to
359 reslist_buffer
.Pointer
= NULL
;
360 reslist_object
= NULL
;
361 if (ACPI_FAILURE(AcpiGetHandle(consumer
, method_name
, &method_handle
)))
362 method_handle
= NULL
;
363 if (ACPI_FAILURE(AcpiGetHandle(consumer
, reslist_name
, &reslist_handle
)))
364 reslist_handle
= NULL
;
365 if (reslist_handle
== NULL
&& method_handle
== NULL
) {
366 if (state
== ACPI_STATE_D0
) {
367 pc
->ac_state
= ACPI_STATE_D0
;
368 return_ACPI_STATUS (AE_OK
);
370 if (state
!= ACPI_STATE_D3
)
373 /* Turn off the resources listed in _PR0 to go to D3. */
374 if (ACPI_FAILURE(AcpiGetHandle(consumer
, "_PR0", &pr0_handle
)))
376 reslist_buffer
.Length
= ACPI_ALLOCATE_BUFFER
;
377 status
= AcpiEvaluateObject(pr0_handle
, NULL
, NULL
, &reslist_buffer
);
378 if (ACPI_FAILURE(status
))
380 reslist_object
= (ACPI_OBJECT
*)reslist_buffer
.Pointer
;
381 if (reslist_object
->Type
!= ACPI_TYPE_PACKAGE
||
382 reslist_object
->Package
.Count
== 0) {
386 AcpiOsFree(reslist_buffer
.Pointer
);
387 reslist_buffer
.Pointer
= NULL
;
388 reslist_object
= NULL
;
392 * Check that we can actually fetch the list of power resources
394 if (reslist_handle
!= NULL
) {
395 reslist_buffer
.Length
= ACPI_ALLOCATE_BUFFER
;
396 status
= AcpiEvaluateObject(reslist_handle
, NULL
, NULL
,
398 if (ACPI_FAILURE(status
)) {
399 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
400 "can't evaluate resource list %s\n",
401 acpi_name(reslist_handle
)));
404 reslist_object
= (ACPI_OBJECT
*)reslist_buffer
.Pointer
;
405 if (reslist_object
->Type
!= ACPI_TYPE_PACKAGE
) {
406 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
407 "resource list is not ACPI_TYPE_PACKAGE (%d)\n",
408 reslist_object
->Type
));
415 * Now we are ready to switch, so kill off any current power
416 * resource references.
419 while((pr
= TAILQ_FIRST(&pc
->ac_references
)) != NULL
) {
421 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "removing reference to %s\n",
422 acpi_name(pr
->ar_resource
->ap_resource
)));
423 TAILQ_REMOVE(&pr
->ar_resource
->ap_references
, pr
, ar_rlink
);
424 TAILQ_REMOVE(&pc
->ac_references
, pr
, ar_clink
);
425 kfree(pr
, M_ACPIPWR
);
429 * Add new power resource references, if we have any. Traverse the
430 * package that we got from evaluating reslist_handle, and look up each
431 * of the resources that are referenced.
433 if (reslist_object
!= NULL
) {
434 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "referencing %d new resources\n",
435 reslist_object
->Package
.Count
));
436 acpi_ForeachPackageObject(reslist_object
, acpi_pwr_reference_resource
,
442 * If we changed anything in the resource list, we need to run a switch
445 if (ACPI_FAILURE(status
= acpi_pwr_switch_power())) {
446 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
447 "failed to switch resources from %s to D%d\n",
448 acpi_name(consumer
), state
));
450 /* XXX is this appropriate? Should we return to previous state? */
454 /* Invoke power state switch method (if present) */
455 if (method_handle
!= NULL
) {
456 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
457 "invoking state transition method %s\n",
458 acpi_name(method_handle
)));
459 status
= AcpiEvaluateObject(method_handle
, NULL
, NULL
, NULL
);
460 if (ACPI_FAILURE(status
)) {
461 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "failed to set state - %s\n",
462 AcpiFormatException(status
)));
463 pc
->ac_state
= ACPI_STATE_UNKNOWN
;
465 /* XXX Should we return to previous state? */
470 /* Transition was successful */
471 pc
->ac_state
= state
;
472 return_ACPI_STATUS (AE_OK
);
475 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
476 "attempt to set unsupported state D%d\n", state
));
477 status
= AE_BAD_PARAMETER
;
480 if (reslist_buffer
.Pointer
!= NULL
)
481 AcpiOsFree(reslist_buffer
.Pointer
);
482 return_ACPI_STATUS (status
);
486 * Called to create a reference between a power consumer and a power resource
487 * identified in the object.
490 acpi_pwr_reference_resource(ACPI_OBJECT
*obj
, void *arg
)
492 struct acpi_powerconsumer
*pc
= (struct acpi_powerconsumer
*)arg
;
493 struct acpi_powerreference
*pr
;
494 struct acpi_powerresource
*rp
;
498 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
500 res
= acpi_GetReference(NULL
, obj
);
502 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
503 "can't create a power reference for object type %d\n",
508 /* Create/look up the resource */
509 if (ACPI_FAILURE(status
= acpi_pwr_register_resource(res
))) {
510 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
511 "couldn't register power resource %s - %s\n",
512 obj
->String
.Pointer
, AcpiFormatException(status
)));
515 if ((rp
= acpi_pwr_find_resource(res
)) == NULL
) {
516 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "power resource list corrupted\n"));
519 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "found power resource %s\n",
520 acpi_name(rp
->ap_resource
)));
522 /* Create a reference between the consumer and resource */
523 pr
= kmalloc(sizeof(*pr
), M_ACPIPWR
, M_INTWAIT
| M_ZERO
);
524 pr
->ar_consumer
= pc
;
525 pr
->ar_resource
= rp
;
526 TAILQ_INSERT_TAIL(&pc
->ac_references
, pr
, ar_clink
);
527 TAILQ_INSERT_TAIL(&rp
->ap_references
, pr
, ar_rlink
);
534 * Switch power resources to conform to the desired state.
536 * Consumers may have modified the power resource list in an arbitrary
537 * fashion; we sweep it in sequence order.
540 acpi_pwr_switch_power(void)
542 struct acpi_powerresource
*rp
;
546 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
549 * Sweep the list forwards turning things on.
551 TAILQ_FOREACH(rp
, &acpi_powerresources
, ap_link
) {
552 if (TAILQ_FIRST(&rp
->ap_references
) == NULL
) {
553 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
554 "%s has no references, not turning on\n",
555 acpi_name(rp
->ap_resource
)));
559 /* We could cache this if we trusted it not to change under us */
560 status
= acpi_GetInteger(rp
->ap_resource
, "_STA", &cur
);
561 if (ACPI_FAILURE(status
)) {
562 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "can't get status of %s - %d\n",
563 acpi_name(rp
->ap_resource
), status
));
565 /* XXX is this correct? Always switch if in doubt? */
570 * Switch if required. Note that we ignore the result of the switch
571 * effort; we don't know what to do if it fails, so checking wouldn't
574 if (cur
!= ACPI_PWR_ON
) {
575 status
= AcpiEvaluateObject(rp
->ap_resource
, "_ON", NULL
, NULL
);
576 if (ACPI_FAILURE(status
)) {
577 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
578 "failed to switch %s on - %s\n",
579 acpi_name(rp
->ap_resource
),
580 AcpiFormatException(status
)));
582 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "switched %s on\n",
583 acpi_name(rp
->ap_resource
)));
586 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "%s is already on\n",
587 acpi_name(rp
->ap_resource
)));
591 /* Sweep the list backwards turning things off. */
592 TAILQ_FOREACH_REVERSE(rp
, &acpi_powerresources
, acpi_powerresource_list
,
595 if (TAILQ_FIRST(&rp
->ap_references
) != NULL
) {
596 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
597 "%s has references, not turning off\n",
598 acpi_name(rp
->ap_resource
)));
602 /* We could cache this if we trusted it not to change under us */
603 status
= acpi_GetInteger(rp
->ap_resource
, "_STA", &cur
);
604 if (ACPI_FAILURE(status
)) {
605 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "can't get status of %s - %d\n",
606 acpi_name(rp
->ap_resource
), status
));
607 /* XXX is this correct? Always switch if in doubt? */
612 * Switch if required. Note that we ignore the result of the switch
613 * effort; we don't know what to do if it fails, so checking wouldn't
616 if (cur
!= ACPI_PWR_OFF
) {
617 status
= AcpiEvaluateObject(rp
->ap_resource
, "_OFF", NULL
, NULL
);
618 if (ACPI_FAILURE(status
)) {
619 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
,
620 "failed to switch %s off - %s\n",
621 acpi_name(rp
->ap_resource
),
622 AcpiFormatException(status
)));
624 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "switched %s off\n",
625 acpi_name(rp
->ap_resource
)));
628 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS
, "%s is already off\n",
629 acpi_name(rp
->ap_resource
)));
633 return_ACPI_STATUS (AE_OK
);
637 * Find a power resource's control structure.
639 static struct acpi_powerresource
*
640 acpi_pwr_find_resource(ACPI_HANDLE res
)
642 struct acpi_powerresource
*rp
;
644 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
646 TAILQ_FOREACH(rp
, &acpi_powerresources
, ap_link
) {
647 if (rp
->ap_resource
== res
)
655 * Find a power consumer's control structure.
657 static struct acpi_powerconsumer
*
658 acpi_pwr_find_consumer(ACPI_HANDLE consumer
)
660 struct acpi_powerconsumer
*pc
;
662 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__
);
664 TAILQ_FOREACH(pc
, &acpi_powerconsumers
, ac_link
) {
665 if (pc
->ac_consumer
== consumer
)