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

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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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/dev/acpica/acpi_powerres.c 267647 2014-06-19 18:35:14Z jhb $");
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 <contrib/dev/acpica/include/acpi.h>

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59
60/* Hooks for the ACPI CA debugging infrastructure */
61#define _COMPONENT ACPI_POWERRES
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};

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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 UINT64 ap_systemlevel;
91 UINT64 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;
98ACPI_SERIAL_DECL(powerres, "ACPI power resources");
99

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166 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
167 "questionable power resource object %s\n",
168 acpi_name(res)));
169 status = AE_TYPE;
170 goto out;
171 }
172 rp->ap_systemlevel = obj->PowerResource.SystemLevel;
173 rp->ap_order = obj->PowerResource.ResourceOrder;
174
175 /* Sort the resource into the list */
176 status = AE_OK;
177 srp = TAILQ_FIRST(&acpi_powerresources);
178 if (srp == NULL || rp->ap_order < srp->ap_order) {
179 TAILQ_INSERT_HEAD(&acpi_powerresources, rp, ap_link);
180 goto done;
181 }

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630 TAILQ_FOREACH(rp, &acpi_powerresources, ap_link) {
631 if (TAILQ_FIRST(&rp->ap_references) == NULL) {
632 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
633 "%s has no references, not turning on\n",
634 acpi_name(rp->ap_resource)));
635 continue;
636 }
637
638 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur);
639 if (ACPI_FAILURE(status)) {
640 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
641 acpi_name(rp->ap_resource), status));
642 /* XXX is this correct? Always switch if in doubt? */
643 continue;
644 }
645
646 /*
647 * Switch if required. Note that we ignore the result of the switch
648 * effort; we don't know what to do if it fails, so checking wouldn't
649 * help much.
650 */
651 if (cur != ACPI_PWR_ON) {
652 status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL);
653 if (ACPI_FAILURE(status)) {
654 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
655 "failed to switch %s on - %s\n",
656 acpi_name(rp->ap_resource),
657 AcpiFormatException(status)));
658 } else {
659 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s on\n",
660 acpi_name(rp->ap_resource)));
661 }
662 } else {
663 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already on\n",
664 acpi_name(rp->ap_resource)));
665 }
666 }

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671
672 if (TAILQ_FIRST(&rp->ap_references) != NULL) {
673 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
674 "%s has references, not turning off\n",
675 acpi_name(rp->ap_resource)));
676 continue;
677 }
678
679 status = acpi_GetInteger(rp->ap_resource, "_STA", &cur);
680 if (ACPI_FAILURE(status)) {
681 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "can't get status of %s - %d\n",
682 acpi_name(rp->ap_resource), status));
683 /* XXX is this correct? Always switch if in doubt? */
684 continue;
685 }
686
687 /*
688 * Switch if required. Note that we ignore the result of the switch
689 * effort; we don't know what to do if it fails, so checking wouldn't
690 * help much.
691 */
692 if (cur != ACPI_PWR_OFF) {
693 status = AcpiEvaluateObject(rp->ap_resource, "_OFF", NULL, NULL);
694 if (ACPI_FAILURE(status)) {
695 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS,
696 "failed to switch %s off - %s\n",
697 acpi_name(rp->ap_resource),
698 AcpiFormatException(status)));
699 } else {
700 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "switched %s off\n",
701 acpi_name(rp->ap_resource)));
702 }
703 } else {
704 ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "%s is already off\n",
705 acpi_name(rp->ap_resource)));
706 }
707 }

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