system/dev/bus/acpi/power.c

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "power.h"

#include <acpica/acpi.h>
#include <ddk/debug.h>
#include <zircon/syscalls/system.h>

void poweroff(void) {
    ACPI_STATUS status = AcpiEnterSleepStatePrep(5);
    if (status == AE_OK) {
        AcpiEnterSleepState(5);
    }
}

void reboot(void) {
    AcpiReset();
}

zx_status_t suspend_to_ram(void) {
    zx_status_t status = ZX_OK;

    acpica_enable_noncontested_mode();

    status = zx_system_powerctl(get_root_resource(),
                                ZX_SYSTEM_POWERCTL_DISABLE_ALL_CPUS_BUT_PRIMARY, NULL);
    if (status != ZX_OK) {
        zxlogf(ERROR, "acpi: Failed to shutdown CPUs: %d\n", status);
        goto cleanup;
    }

    ACPI_STATUS acpi_status = AcpiEnterSleepStatePrep(3);
    if (acpi_status != AE_OK) {
        zxlogf(ERROR, "acpi: Failed to prep enter sleep state: %x\n", acpi_status);
        // TODO: I think we need to do LeaveSleepState{Prep,} on failure
        status = ZX_ERR_INTERNAL;
        goto cleanup;
    }

    acpi_status = AcpiEnterSleepState(3);
    if (acpi_status != AE_OK) {
        status = ZX_ERR_INTERNAL;
        zxlogf(ERROR, "acpi: Failed to enter sleep state: %x\n", acpi_status);
        // Continue executing to try to get the system back to where it was
    }
    zxlogf(TRACE, "acpi: Woke up from sleep\n");

    acpi_status = AcpiLeaveSleepStatePrep(3);
    if (acpi_status != AE_OK) {
        status = ZX_ERR_INTERNAL;
        zxlogf(ERROR, "acpi: Failed to prep leave sleep state: %x\n", acpi_status);
    }

    acpi_status = AcpiLeaveSleepState(3);
    if (acpi_status != AE_OK) {
        status = ZX_ERR_INTERNAL;
        zxlogf(ERROR, "acpi: Failed to leave sleep state: %x\n", acpi_status);
    }

    zx_status_t status2;
cleanup:
    status2 = zx_system_powerctl(get_root_resource(), ZX_SYSTEM_POWERCTL_ENABLE_ALL_CPUS, NULL);
    if (status2 != ZX_OK) {
        zxlogf(ERROR, "acpi: Re-enabling all cpus failed: %d\n", status2);
    }

    acpica_disable_noncontested_mode();

    zxlogf(INFO, "acpi: Finished processing suspend: %d\n", status);
    return status;
}