1 /*-
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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
48  * ugly case where we may turn off power to a device which is in use because
49  * we don't know that it depends on a given resource.  We should perhaps
53  * on, turned off, etc.
56 static MALLOC_DEFINE(M_ACPIPWR, "acpipwr", "ACPI power resources");
62 /* Return values from _STA on a power resource */
66 /* A relationship between a power resource and a consumer. */
70     TAILQ_ENTRY(acpi_powerreference)	ar_rlink; /* link on resource list */
71     TAILQ_ENTRY(acpi_powerreference)	ar_clink; /* link on consumer */
74 /* A power-managed device. */
83 /* A power resource. */
96 ACPI_SERIAL_DECL(powerres, "ACPI power resources");
117  * Register a power resource.
144     TAILQ_INIT(&rp->ap_references);  in acpi_pwr_register_resource()
145     rp->ap_resource = res;  in acpi_pwr_register_resource()
147     /* Get the Power Resource object */  in acpi_pwr_register_resource()
150 	ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "no power resource object\n"));  in acpi_pwr_register_resource()
154     if (obj->Type != ACPI_TYPE_POWER) {  in acpi_pwr_register_resource()
156 			 "questionable power resource object %s\n",  in acpi_pwr_register_resource()
161     rp->ap_systemlevel = obj->PowerResource.SystemLevel;  in acpi_pwr_register_resource()
162     rp->ap_order = obj->PowerResource.ResourceOrder;  in acpi_pwr_register_resource()
167     if (srp == NULL || rp->ap_order < srp->ap_order) {  in acpi_pwr_register_resource()
172 	if (rp->ap_order < srp->ap_order) {  in acpi_pwr_register_resource()
181 		     "registered power resource %s\n", acpi_name(res)));  in acpi_pwr_register_resource()
193  * Deregister a power resource.
210     if (TAILQ_FIRST(&rp->ap_references) != NULL)  in acpi_pwr_deregister_resource()
217     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power resource %s\n",  in acpi_pwr_deregister_resource()
225  * Register a power consumer.  
241     /* Allocate a new power consumer */  in acpi_pwr_register_consumer()
245     TAILQ_INIT(&pc->ac_references);  in acpi_pwr_register_consumer()
246     pc->ac_consumer = consumer;  in acpi_pwr_register_consumer()
249     pc->ac_state = ACPI_STATE_UNKNOWN;  in acpi_pwr_register_consumer()
251     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "registered power consumer %s\n",  in acpi_pwr_register_consumer()
259  * Deregister a power consumer.
277     if (TAILQ_FIRST(&pc->ac_references) != NULL)  in acpi_pwr_deregister_consumer()
284     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "deregistered power consumer %s\n",  in acpi_pwr_deregister_consumer()
292  * Set a power consumer to a particular power state.
306     /* It's never ok to switch a non-existent consumer. */  in acpi_pwr_switch_consumer()
318 	    panic("acpi added power consumer but can't find it");  in acpi_pwr_switch_consumer()
323     if (pc->ac_state == ACPI_STATE_D3 && state != ACPI_STATE_D0)  in acpi_pwr_switch_consumer()
347     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "setup to switch %s D%d -> D%d\n",  in acpi_pwr_switch_consumer()
348 		     acpi_name(consumer), pc->ac_state, state));  in acpi_pwr_switch_consumer()
366 	    pc->ac_state = ACPI_STATE_D0;  in acpi_pwr_switch_consumer()
378 	 * no _PR0 method, this object doesn't support ACPI power states.  in acpi_pwr_switch_consumer()
407      * Check that we can actually fetch the list of power resources  in acpi_pwr_switch_consumer()
420 	if (reslist_object->Type != ACPI_TYPE_PACKAGE) {  in acpi_pwr_switch_consumer()
423 			     reslist_object->Type));  in acpi_pwr_switch_consumer()
430      * Now we are ready to switch, so kill off any current power  in acpi_pwr_switch_consumer()
436      * Add new power resource references, if we have any.  Traverse the  in acpi_pwr_switch_consumer()
442 			  reslist_object->Package.Count));  in acpi_pwr_switch_consumer()
460     /* Invoke power state switch method (if present) */  in acpi_pwr_switch_consumer()
467 		ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "failed to set state - %s\n",  in acpi_pwr_switch_consumer()
469 		pc->ac_state = ACPI_STATE_UNKNOWN;  in acpi_pwr_switch_consumer()
477     pc->ac_state = state;  in acpi_pwr_switch_consumer()
487 /* Enable or disable a power resource for wake */
506 	    panic("acpi wake added power consumer but can't find it");  in acpi_pwr_wake_enable()
527  * Called to create a reference between a power consumer and a power resource
545 			 "can't create a power reference for object type %d\n",  in acpi_pwr_reference_resource()
546 			 obj->Type));  in acpi_pwr_reference_resource()
553 			 "couldn't register power resource %s - %s\n",  in acpi_pwr_reference_resource()
554 			 obj->String.Pointer, AcpiFormatException(status)));  in acpi_pwr_reference_resource()
558 	ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "power resource list corrupted\n"));  in acpi_pwr_reference_resource()
561     ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "found power resource %s\n",  in acpi_pwr_reference_resource()
562 		     acpi_name(rp->ap_resource)));  in acpi_pwr_reference_resource()
567 			 "allocation failed for a power consumer reference\n"));  in acpi_pwr_reference_resource()
570     pr->ar_consumer = pc;  in acpi_pwr_reference_resource()
571     pr->ar_resource = rp;  in acpi_pwr_reference_resource()
572     TAILQ_INSERT_TAIL(&pc->ac_references, pr, ar_clink);  in acpi_pwr_reference_resource()
573     TAILQ_INSERT_TAIL(&rp->ap_references, pr, ar_rlink);  in acpi_pwr_reference_resource()
588     while ((pr = TAILQ_FIRST(&pc->ac_references)) != NULL) {  in acpi_pwr_dereference_resource()
590                          acpi_name(pr->ar_resource->ap_resource)));  in acpi_pwr_dereference_resource()
591         TAILQ_REMOVE(&pr->ar_resource->ap_references, pr, ar_rlink);  in acpi_pwr_dereference_resource()
592         TAILQ_REMOVE(&pc->ac_references, pr, ar_clink);  in acpi_pwr_dereference_resource()
601  * Switch power resources to conform to the desired state.
603  * Consumers may have modified the power resource list in an arbitrary
617      * Sweep the list forwards turning things on.  in acpi_pwr_switch_power()
620 	if (TAILQ_FIRST(&rp->ap_references) == NULL) {  in acpi_pwr_switch_power()
622 			     "%s has no references, not turning on\n",  in acpi_pwr_switch_power()
623 			     acpi_name(rp->ap_resource)));  in acpi_pwr_switch_power()
627 	status = acpi_GetInteger(rp->ap_resource, "_STA", &cur);  in acpi_pwr_switch_power()
629 	    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",  in acpi_pwr_switch_power()
630 			      acpi_name(rp->ap_resource), status));  in acpi_pwr_switch_power()
641 	    status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL);  in acpi_pwr_switch_power()
644 				 "failed to switch %s on - %s\n",   in acpi_pwr_switch_power()
645 				 acpi_name(rp->ap_resource),  in acpi_pwr_switch_power()
648 		ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n",  in acpi_pwr_switch_power()
649 				 acpi_name(rp->ap_resource)));  in acpi_pwr_switch_power()
652 	    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n",  in acpi_pwr_switch_power()
653 			     acpi_name(rp->ap_resource)));  in acpi_pwr_switch_power()
660 	if (TAILQ_FIRST(&rp->ap_references) != NULL) {  in acpi_pwr_switch_power()
663 			     acpi_name(rp->ap_resource)));  in acpi_pwr_switch_power()
667 	status = acpi_GetInteger(rp->ap_resource, "_STA", &cur);  in acpi_pwr_switch_power()
669 	    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",  in acpi_pwr_switch_power()
670 			      acpi_name(rp->ap_resource), status));  in acpi_pwr_switch_power()
681 	    status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL);  in acpi_pwr_switch_power()
684 				 "failed to switch %s off - %s\n",   in acpi_pwr_switch_power()
685 				 acpi_name(rp->ap_resource),  in acpi_pwr_switch_power()
689 				 acpi_name(rp->ap_resource)));  in acpi_pwr_switch_power()
693 			     acpi_name(rp->ap_resource)));  in acpi_pwr_switch_power()
701  * Find a power resource's control structure.
712 	if (rp->ap_resource == res)  in acpi_pwr_find_resource()
720  * Find a power consumer's control structure.
731 	if (pc->ac_consumer == consumer)  in acpi_pwr_find_consumer()