Merge from vendor branch INTEL_ACPICA:

[dragonfly.git] / sys / dev / acpica5 / acpi.c

/*-
 * Copyright (c) 2000 Takanori Watanabe <takawata@jp.freebsd.org>
 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
 * Copyright (c) 2000, 2001 Michael Smith
 * Copyright (c) 2000 BSDi
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      $FreeBSD: src/sys/dev/acpica/acpi.c,v 1.157 2004/06/05 09:56:04 njl Exp $
 *      $DragonFly: src/sys/dev/acpica5/acpi.c,v 1.27 2007/01/13 21:58:11 tgen Exp $
 */

#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioccom.h>
#include <sys/reboot.h>
#include <sys/sysctl.h>
#include <sys/ctype.h>
#include <sys/linker.h>
#include <sys/power.h>
#include <sys/sbuf.h>
#include <sys/rman.h>

#include <sys/thread2.h>

#include <machine/clock.h>
#include <machine/globaldata.h>
#include <bus/isa/isavar.h>

#include "acpi.h"
#include <dev/acpica5/acpivar.h>
#include <dev/acpica5/acpiio.h>
#include <acnamesp.h>

MALLOC_DEFINE(M_ACPIDEV, "acpidev", "ACPI devices");

/* Hooks for the ACPI CA debugging infrastructure */
#define _COMPONENT      ACPI_BUS
ACPI_MODULE_NAME("ACPI")

static d_open_t         acpiopen;
static d_close_t        acpiclose;
static d_ioctl_t        acpiioctl;

#define CDEV_MAJOR 152
static struct dev_ops acpi_ops = {
        { "acpi", CDEV_MAJOR, 0 },
        .d_open = acpiopen,
        .d_close = acpiclose,
        .d_ioctl = acpiioctl
};

#if __FreeBSD_version >= 500000
struct mtx      acpi_mutex;
#endif

struct acpi_quirks {
    char        *OemId;
    uint32_t    OemRevision;
    char        *value;
};

#define ACPI_OEM_REV_ANY        0

static struct acpi_quirks acpi_quirks_table[] = {
#ifdef notyet
    /* Bad PCI routing table.  Used on some SuperMicro boards. */
    { "PTLTD ", 0x06040000, "pci_link" },
#endif
#ifdef ACPI_QUIRK_VMWARE
    /*
     * VMware's ACPI-fast24 timer runs roughly 65 times too fast, and not
     * predictably/monotonic either. This is observed at least under SMP
     * conditions.
     *
     * NOTE: this combination of OemId and OemRevision is NOT unique; it is
     * known or suspected that at least some SuperMicro boards (see above) and
     * the Compaq Presario 1952 use this combination. That's why this quirks
     * entry is guarded by an #ifdef, and associated config option.
     */
    { "PTLTD ", 0x06040000, "timer" },
#endif /* ACPI_QUIRK_VMWARE */
    { NULL, 0, NULL }
};

static int      acpi_modevent(struct module *mod, int event, void *junk);
static int      acpi_identify(driver_t *driver, device_t parent);
static int      acpi_probe(device_t dev);
static int      acpi_attach(device_t dev);
static int      acpi_shutdown(device_t dev);
static void     acpi_quirks_set(void);
static device_t acpi_add_child(device_t bus, device_t parent, int order,
                        const char *name, int unit);
static int      acpi_print_child(device_t bus, device_t child);
static int      acpi_read_ivar(device_t dev, device_t child, int index,
                        uintptr_t *result);
static int      acpi_write_ivar(device_t dev, device_t child, int index,
                        uintptr_t value);
static int      acpi_set_resource(device_t dev, device_t child, int type,
                        int rid, u_long start, u_long count);
static int      acpi_get_resource(device_t dev, device_t child, int type,
                        int rid, u_long *startp, u_long *countp);
static struct resource *acpi_alloc_resource(device_t bus, device_t child,
                        int type, int *rid, u_long start, u_long end,
                        u_long count, u_int flags);
static int      acpi_release_resource(device_t bus, device_t child, int type,
                        int rid, struct resource *r);
static uint32_t acpi_isa_get_logicalid(device_t dev);
static int      acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count);
static int      acpi_isa_pnp_probe(device_t bus, device_t child,
                        struct isa_pnp_id *ids);
static void     acpi_probe_children(device_t bus);
static ACPI_STATUS acpi_probe_child(ACPI_HANDLE handle, UINT32 level,
                        void *context, void **status);
static void     acpi_shutdown_pre_sync(void *arg, int howto);
static void     acpi_shutdown_final(void *arg, int howto);
static void     acpi_shutdown_poweroff(void *arg);
static void     acpi_enable_fixed_events(struct acpi_softc *sc);
static int      acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw);
static ACPI_STATUS acpi_wake_limit(ACPI_HANDLE h, UINT32 level, void *context,
                    void **status);
static int      acpi_wake_limit_walk(int sstate);
static int      acpi_wake_sysctl_walk(device_t dev);
#ifdef dfly_notyet
static int      acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS);
#endif
static void     acpi_system_eventhandler_sleep(void *arg, int state);
static void     acpi_system_eventhandler_wakeup(void *arg, int state);
static int      acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
static int      acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS);
static int      acpi_pm_func(u_long cmd, void *arg, ...);
static int      acpi_child_location_str_method(device_t acdev, device_t child,
                                               char *buf, size_t buflen);
static int      acpi_child_pnpinfo_str_method(device_t acdev, device_t child,
                                              char *buf, size_t buflen);

static device_method_t acpi_methods[] = {
    /* Device interface */
    DEVMETHOD(device_identify,          acpi_identify),
    DEVMETHOD(device_probe,             acpi_probe),
    DEVMETHOD(device_attach,            acpi_attach),
    DEVMETHOD(device_shutdown,          acpi_shutdown),
    DEVMETHOD(device_detach,            bus_generic_detach),
    DEVMETHOD(device_suspend,           bus_generic_suspend),
    DEVMETHOD(device_resume,            bus_generic_resume),

    /* Bus interface */
    DEVMETHOD(bus_add_child,            acpi_add_child),
    DEVMETHOD(bus_print_child,          acpi_print_child),
    DEVMETHOD(bus_read_ivar,            acpi_read_ivar),
    DEVMETHOD(bus_write_ivar,           acpi_write_ivar),
    DEVMETHOD(bus_set_resource,         acpi_set_resource),
    DEVMETHOD(bus_get_resource,         acpi_get_resource),
    DEVMETHOD(bus_alloc_resource,       acpi_alloc_resource),
    DEVMETHOD(bus_release_resource,     acpi_release_resource),
    DEVMETHOD(bus_child_pnpinfo_str,    acpi_child_pnpinfo_str_method),
    DEVMETHOD(bus_child_location_str,   acpi_child_location_str_method),
    DEVMETHOD(bus_driver_added,         bus_generic_driver_added),
    DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
    DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
    DEVMETHOD(bus_setup_intr,           bus_generic_setup_intr),
    DEVMETHOD(bus_teardown_intr,        bus_generic_teardown_intr),

    /* ISA emulation */
    DEVMETHOD(isa_pnp_probe,            acpi_isa_pnp_probe),

    {0, 0}
};

static driver_t acpi_driver = {
    "acpi",
    acpi_methods,
    sizeof(struct acpi_softc),
};

static devclass_t acpi_devclass;
DRIVER_MODULE(acpi, nexus, acpi_driver, acpi_devclass, acpi_modevent, 0);
MODULE_VERSION(acpi, 1);

static const char* sleep_state_names[] = {
    "S0", "S1", "S2", "S3", "S4", "S5", "NONE"};

SYSCTL_NODE(_debug, OID_AUTO, acpi, CTLFLAG_RW, NULL, "ACPI debugging");
static char acpi_ca_version[12];
SYSCTL_STRING(_debug_acpi, OID_AUTO, acpi_ca_version, CTLFLAG_RD,
              acpi_ca_version, 0, "Version of Intel ACPI-CA");

/*
 * Allow override of whether methods execute in parallel or not.
 * Enable this for serial behavior, which fixes "AE_ALREADY_EXISTS"
 * errors for AML that really can't handle parallel method execution.
 * It is off by default since this breaks recursive methods and
 * some IBMs use such code.
 */
static int acpi_serialize_methods;
TUNABLE_INT("hw.acpi.serialize_methods", &acpi_serialize_methods);

/*
 * ACPI can only be loaded as a module by the loader; activating it after
 * system bootstrap time is not useful, and can be fatal to the system.
 * It also cannot be unloaded, since the entire system bus heirarchy hangs
 * off it.
 */
static int
acpi_modevent(struct module *mod, int event, void *junk)
{
    switch(event) {
    case MOD_LOAD:
        if (!cold) {
            kprintf("The ACPI driver cannot be loaded after boot.\n");
            return (EPERM);
        }
        break;
    case MOD_UNLOAD:
        if (!cold && power_pm_get_type() == POWER_PM_TYPE_ACPI)
            return (EBUSY);
        break;
    default:
        break;
    }
    return (0);
}

/*
 * Perform early initialization.
 */
ACPI_STATUS
acpi_Startup(void)
{
#ifdef ACPI_DEBUGGER
    char *debugpoint;
#endif
    static int error, started = 0;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    if (started)
        return_VALUE (error);
    started = 1;

#if __FreeBSD_version >= 500000
    /* Initialise the ACPI mutex */
    mtx_init(&acpi_mutex, "ACPI global lock", NULL, MTX_DEF);
#endif

    /*
     * Set the globals from our tunables.  This is needed because ACPI-CA
     * uses UINT8 for some values and we have no tunable_byte.
     */
    AcpiGbl_AllMethodsSerialized = (UINT8)acpi_serialize_methods;

    /* Start up the ACPI CA subsystem. */
#ifdef ACPI_DEBUGGER
    debugpoint = kgetenv("debug.acpi.debugger");
    if (debugpoint) {
        if (!strcmp(debugpoint, "init"))
            acpi_EnterDebugger();
        freeenv(debugpoint);
    }
#endif
    if (ACPI_FAILURE(error = AcpiInitializeSubsystem())) {
        kprintf("ACPI: initialisation failed: %s\n", AcpiFormatException(error));
        return_VALUE (error);
    }
#ifdef ACPI_DEBUGGER
    debugpoint = kgetenv("debug.acpi.debugger");
    if (debugpoint) {
        if (!strcmp(debugpoint, "tables"))
            acpi_EnterDebugger();
        freeenv(debugpoint);
    }
#endif

    if (ACPI_FAILURE(error = AcpiLoadTables())) {
        kprintf("ACPI: table load failed: %s\n", AcpiFormatException(error));
        return_VALUE(error);
    }

    /* Set up any quirks we have for this XSDT. */
    acpi_quirks_set();
    if (acpi_disabled("acpi"))
        return_VALUE (AE_ERROR);

    return_VALUE (AE_OK);
}

/*
 * Detect ACPI, perform early initialisation
 */
static int
acpi_identify(driver_t *driver, device_t parent)
{
    device_t    child;

    /*
     * No sense rescanning an ACPI 'bus'.
     */
    if (device_get_state(parent) == DS_ATTACHED)
        return(0);

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    if (!cold)
        return (ENXIO);

    /* Check that we haven't been disabled with a hint. */
    if (resource_disabled("acpi", 0))
        return (ENXIO);

    /* Make sure we're not being doubly invoked. */
    if (device_find_child(parent, "acpi", 0) != NULL)
        return (ENXIO);

    /* Initialize ACPI-CA. */
    if (ACPI_FAILURE(acpi_Startup()))
        return (ENXIO);

    ksnprintf(acpi_ca_version, sizeof(acpi_ca_version), "%#x", ACPI_CA_VERSION);

    /* Attach the actual ACPI device. */
    if ((child = BUS_ADD_CHILD(parent, parent, 0, "acpi", 0)) == NULL) {
        device_printf(parent, "ACPI: could not attach\n");
        return (ENXIO);
    }
    return (0);
}

/*
 * Fetch some descriptive data from ACPI to put in our attach message
 */
static int
acpi_probe(device_t dev)
{
    ACPI_TABLE_HEADER   th;
    char                buf[20];
    int                 error;
    struct sbuf         sb;
    ACPI_STATUS         status;
    ACPI_LOCK_DECL;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    if (power_pm_get_type() != POWER_PM_TYPE_NONE &&
        power_pm_get_type() != POWER_PM_TYPE_ACPI) {

        device_printf(dev, "Other PM system enabled.\n");
        return_VALUE(ENXIO);
    }

    ACPI_LOCK;

    if (ACPI_FAILURE(status = AcpiGetTableHeader(ACPI_TABLE_XSDT, 1, &th))) {
        device_printf(dev, "couldn't get XSDT header: %s\n",
                      AcpiFormatException(status));
        error = ENXIO;
    } else {
        sbuf_new(&sb, buf, sizeof(buf), SBUF_FIXEDLEN);
        sbuf_bcat(&sb, th.OemId, 6);
        sbuf_trim(&sb);
        sbuf_putc(&sb, ' ');
        sbuf_bcat(&sb, th.OemTableId, 8);
        sbuf_trim(&sb);
        sbuf_finish(&sb);
        device_set_desc_copy(dev, sbuf_data(&sb));
        sbuf_delete(&sb);
        error = 0;
    }
    ACPI_UNLOCK;
    return_VALUE(error);
}

static int
acpi_attach(device_t dev)
{
    struct acpi_softc   *sc;
    ACPI_STATUS         status;
    int                 error, state;
    UINT32              flags;
    UINT8               TypeA, TypeB;
    char                *env;
#ifdef ACPI_DEBUGGER
    char                *debugpoint;
#endif
    ACPI_LOCK_DECL;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
    ACPI_LOCK;
    sc = device_get_softc(dev);
    bzero(sc, sizeof(*sc));
    sc->acpi_dev = dev;
    callout_init(&sc->acpi_sleep_timer);

#ifdef ACPI_DEBUGGER
    debugpoint = kgetenv("debug.acpi.debugger");
    if (debugpoint) {
        if (!strcmp(debugpoint, "spaces"))
            acpi_EnterDebugger();
        freeenv(debugpoint);
    }
#endif

    /* Install the default address space handlers. */
    error = ENXIO;
    status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
                ACPI_ADR_SPACE_SYSTEM_MEMORY, ACPI_DEFAULT_HANDLER, NULL, NULL);
    if (ACPI_FAILURE(status)) {
        device_printf(dev, "Could not initialise SystemMemory handler: %s\n",
                      AcpiFormatException(status));
        goto out;
    }
    status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
                ACPI_ADR_SPACE_SYSTEM_IO, ACPI_DEFAULT_HANDLER, NULL, NULL);
    if (ACPI_FAILURE(status)) {
        device_printf(dev, "Could not initialise SystemIO handler: %s\n",
                      AcpiFormatException(status));
        goto out;
    }
    status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
                ACPI_ADR_SPACE_PCI_CONFIG, ACPI_DEFAULT_HANDLER, NULL, NULL);
    if (ACPI_FAILURE(status)) {
        device_printf(dev, "could not initialise PciConfig handler: %s\n",
                      AcpiFormatException(status));
        goto out;
    }

    /*
     * Bring ACPI fully online.
     *
     * Note that some systems (specifically, those with namespace evaluation
     * issues that require the avoidance of parts of the namespace) must
     * avoid running _INI and _STA on everything, as well as dodging the final
     * object init pass.
     *
     * For these devices, we set ACPI_NO_DEVICE_INIT and ACPI_NO_OBJECT_INIT).
     * For avoiding portions of the namespace without totally disabling _INI
     * and _STA, use "debug.acpi.avoid.paths".
     *
     * XXX We should arrange for the object init pass after we have attached
     *     all our child devices, but on many systems it works here.
     */
#ifdef ACPI_DEBUGGER
    debugpoint = kgetenv("debug.acpi.debugger");
    if (debugpoint) {
        if (!strcmp(debugpoint, "enable"))
            acpi_EnterDebugger();
        freeenv(debugpoint);
    }
#endif
    flags = 0;
    if (testenv("debug.acpi.avoid"))
        flags = ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
    if (ACPI_FAILURE(status = AcpiEnableSubsystem(flags))) {
        device_printf(dev, "Could not enable ACPI: %s\n",
                      AcpiFormatException(status));
        goto out;
    }

    /*
     * Call the ECDT probe function to provide EC functionality before
     * the namespace has been evaluated.
     */
    acpi_ec_ecdt_probe(dev);

    if (ACPI_FAILURE(status = AcpiInitializeObjects(flags))) {
        device_printf(dev, "Could not initialize ACPI objects: %s\n",
                      AcpiFormatException(status));
        goto out;
    }

    /*
     * Setup our sysctl tree.
     *
     * XXX: This doesn't check to make sure that none of these fail.
     */
    sysctl_ctx_init(&sc->acpi_sysctl_ctx);
    sc->acpi_sysctl_tree = SYSCTL_ADD_NODE(&sc->acpi_sysctl_ctx,
                               SYSCTL_STATIC_CHILDREN(_hw), OID_AUTO,
                               device_get_name(dev), CTLFLAG_RD, 0, "");
    SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "supported_sleep_state", CTLTYPE_STRING | CTLFLAG_RD,
        0, 0, acpi_supported_sleep_state_sysctl, "A", "");
    SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "power_button_state", CTLTYPE_STRING | CTLFLAG_RW,
        &sc->acpi_power_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
    SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "sleep_button_state", CTLTYPE_STRING | CTLFLAG_RW,
        &sc->acpi_sleep_button_sx, 0, acpi_sleep_state_sysctl, "A", "");
    SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "lid_switch_state", CTLTYPE_STRING | CTLFLAG_RW,
        &sc->acpi_lid_switch_sx, 0, acpi_sleep_state_sysctl, "A", "");
    SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "standby_state", CTLTYPE_STRING | CTLFLAG_RW,
        &sc->acpi_standby_sx, 0, acpi_sleep_state_sysctl, "A", "");
    SYSCTL_ADD_PROC(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "suspend_state", CTLTYPE_STRING | CTLFLAG_RW,
        &sc->acpi_suspend_sx, 0, acpi_sleep_state_sysctl, "A", "");
    SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "sleep_delay", CTLFLAG_RD | CTLFLAG_RW,
        &sc->acpi_sleep_delay, 0, "sleep delay");
    SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "s4bios", CTLFLAG_RD | CTLFLAG_RW,
        &sc->acpi_s4bios, 0, "S4BIOS mode");
    SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "verbose", CTLFLAG_RD | CTLFLAG_RW,
        &sc->acpi_verbose, 0, "verbose mode");
    SYSCTL_ADD_INT(&sc->acpi_sysctl_ctx, SYSCTL_CHILDREN(sc->acpi_sysctl_tree),
        OID_AUTO, "disable_on_poweroff", CTLFLAG_RD | CTLFLAG_RW,
        &sc->acpi_disable_on_poweroff, 0, "ACPI subsystem disable on poweroff");

    /*
     * Default to 1 second before sleeping to give some machines time to
     * stabilize.
     */
    sc->acpi_sleep_delay = 1;
    sc->acpi_disable_on_poweroff = 0;
    if (bootverbose)
        sc->acpi_verbose = 1;
    if ((env = kgetenv("hw.acpi.verbose")) && strcmp(env, "0")) {
        sc->acpi_verbose = 1;
        freeenv(env);
    }

    /* Only enable S4BIOS by default if the FACS says it is available. */
    if (AcpiGbl_FACS->S4Bios_f != 0)
            sc->acpi_s4bios = 1;

    /*
     * Dispatch the default sleep state to devices.  The lid switch is set
     * to NONE by default to avoid surprising users.
     */
    sc->acpi_power_button_sx = ACPI_STATE_S5;
    sc->acpi_lid_switch_sx = ACPI_S_STATES_MAX + 1;
    sc->acpi_standby_sx = ACPI_STATE_S1;
    sc->acpi_suspend_sx = ACPI_STATE_S3;

    /* Pick the first valid sleep state for the sleep button default. */
    sc->acpi_sleep_button_sx = ACPI_S_STATES_MAX + 1;
    for (state = ACPI_STATE_S1; state < ACPI_STATE_S5; state++)
        if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB))) {
            sc->acpi_sleep_button_sx = state;
            break;
        }

    acpi_enable_fixed_events(sc);

    /*
     * Scan the namespace and attach/initialise children.
     */
#ifdef ACPI_DEBUGGER
    debugpoint = kgetenv("debug.acpi.debugger");
    if (debugpoint) {
        if (!strcmp(debugpoint, "probe"))
            acpi_EnterDebugger();
        freeenv(debugpoint);
    }
#endif

    /* Register our shutdown handlers */
    EVENTHANDLER_REGISTER(shutdown_pre_sync, acpi_shutdown_pre_sync, sc,
        SHUTDOWN_PRI_LAST);
    EVENTHANDLER_REGISTER(shutdown_final, acpi_shutdown_final, sc,
        SHUTDOWN_PRI_LAST);

    /*
     * Register our acpi event handlers.
     * XXX should be configurable eg. via userland policy manager.
     */
    EVENTHANDLER_REGISTER(acpi_sleep_event, acpi_system_eventhandler_sleep,
        sc, ACPI_EVENT_PRI_LAST);
    EVENTHANDLER_REGISTER(acpi_wakeup_event, acpi_system_eventhandler_wakeup,
        sc, ACPI_EVENT_PRI_LAST);

    /* Flag our initial states. */
    sc->acpi_enabled = 1;
    sc->acpi_sstate = ACPI_STATE_S0;
    sc->acpi_sleep_disabled = 0;

    /* Create the control device */
    dev_ops_add(&acpi_ops, 0, 0);
    sc->acpi_dev_t = make_dev(&acpi_ops, 0, UID_ROOT, GID_WHEEL, 0644,
                              "acpi");
    sc->acpi_dev_t->si_drv1 = sc;

#ifdef ACPI_DEBUGGER
    debugpoint = kgetenv("debug.acpi.debugger");
    if (debugpoint) {
        if (strcmp(debugpoint, "running") == 0)
            acpi_EnterDebugger();
        freeenv(debugpoint);
    }
#endif

    if ((error = acpi_task_thread_init()))
        goto out;

    if ((error = acpi_machdep_init(dev)))
        goto out;

    /* Register ACPI again to pass the correct argument of pm_func. */
    power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, sc);

    if (!acpi_disabled("bus"))
        acpi_probe_children(dev);

    error = 0;

 out:
    ACPI_UNLOCK;
    return_VALUE (error);
}

static int
acpi_shutdown(device_t dev)
{
    /* Allow children to shutdown first. */
    bus_generic_shutdown(dev);

    /* Disable all wake GPEs not appropriate for reboot/poweroff. */
    acpi_wake_limit_walk(ACPI_STATE_S5);
    return (0);
}

static void
acpi_quirks_set(void)
{
    XSDT_DESCRIPTOR *xsdt;
    struct acpi_quirks *quirk;
    char *env, *tmp;
    int len;

    /*
     * If the user loaded a custom table or disabled "quirks", leave
     * the settings alone.
     */
    len = 0;
    if ((env = kgetenv("acpi_dsdt_load")) != NULL) {
        /* XXX No strcasecmp but this is good enough. */
        if (*env == 'Y' || *env == 'y')
            goto out;
        kfreeenv(env);
    }
    if ((env = kgetenv("debug.acpi.disabled")) != NULL) {
        if (strstr("quirks", env) != NULL)
            goto out;
        len = strlen(env);
    }

    /*
     * Search through our quirk table and concatenate the disabled
     * values with whatever we find.
     */
    xsdt = AcpiGbl_XSDT;
    for (quirk = acpi_quirks_table; quirk->OemId; quirk++) {
        if (!strncmp(xsdt->OemId, quirk->OemId, strlen(quirk->OemId)) &&
            (xsdt->OemRevision == quirk->OemRevision ||
            quirk->OemRevision == ACPI_OEM_REV_ANY)) {
                len += strlen(quirk->value) + 2;
                if ((tmp = kmalloc(len, M_TEMP, M_NOWAIT)) == NULL)
                    goto out;
                ksprintf(tmp, "%s %s", env ? env : "", quirk->value);
                ksetenv("debug.acpi.disabled", tmp);
                kfree(tmp, M_TEMP);
                break;
        }
    }

out:
    if (env)
        kfreeenv(env);
}

/*
 * Handle a new device being added
 */
static device_t
acpi_add_child(device_t bus, device_t parent, int order,
                const char *name, int unit)
{
    struct acpi_device  *ad;
    device_t            child;

    ad = kmalloc(sizeof(*ad), M_ACPIDEV, M_INTWAIT | M_ZERO);

    resource_list_init(&ad->ad_rl);

    child = device_add_child_ordered(parent, order, name, unit);
    if (child != NULL)
        device_set_ivars(child, ad);
    return (child);
}

static int
acpi_print_child(device_t bus, device_t child)
{
    struct acpi_device   *adev = device_get_ivars(child);
    struct resource_list *rl = &adev->ad_rl;
    int retval = 0;

    retval += bus_print_child_header(bus, child);
    retval += resource_list_print_type(rl, "port",  SYS_RES_IOPORT, "%#lx");
    retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
    retval += resource_list_print_type(rl, "irq",   SYS_RES_IRQ,    "%ld");
    retval += resource_list_print_type(rl, "drq",   SYS_RES_DRQ,    "%ld");
    retval += bus_print_child_footer(bus, child);

    return (retval);
}

/* Location hint for devctl(8) */
static int
acpi_child_location_str_method(device_t cbdev, device_t child, char *buf,
    size_t buflen)
{
    struct acpi_device *dinfo = device_get_ivars(child);

    if (dinfo->ad_handle)
        ksnprintf(buf, buflen, "path=%s", acpi_name(dinfo->ad_handle));
    else
        ksnprintf(buf, buflen, "magic=unknown");
    return (0);
}

/* PnP information for devctl(8) */
static int
acpi_child_pnpinfo_str_method(device_t cbdev, device_t child, char *buf,
    size_t buflen)
{
    ACPI_BUFFER adbuf = {ACPI_ALLOCATE_BUFFER, NULL};
    ACPI_DEVICE_INFO *adinfo;
    struct acpi_device *dinfo = device_get_ivars(child);
    char *end;
    int error;

    error = AcpiGetObjectInfo(dinfo->ad_handle, &adbuf);
    adinfo = (ACPI_DEVICE_INFO *) adbuf.Pointer;

    if (error)
        ksnprintf(buf, buflen, "Unknown");
    else
        ksnprintf(buf, buflen, "_HID=%s _UID=%lu",
                (adinfo->Valid & ACPI_VALID_HID) ?
                adinfo->HardwareId.Value : "UNKNOWN",
                (adinfo->Valid & ACPI_VALID_UID) ?
                strtoul(adinfo->UniqueId.Value, &end, 10) : 0);

    if (adinfo)
        AcpiOsFree(adinfo);

    return (0);
}

/*
 * Handle per-device ivars
 */
static int
acpi_read_ivar(device_t dev, device_t child, int index, uintptr_t *result)
{
    struct acpi_device  *ad;

    if ((ad = device_get_ivars(child)) == NULL) {
        kprintf("device has no ivars\n");
        return (ENOENT);
    }

    /* ACPI and ISA compatibility ivars */
    switch(index) {
    case ACPI_IVAR_HANDLE:
        *(ACPI_HANDLE *)result = ad->ad_handle;
        break;
    case ACPI_IVAR_MAGIC:
        *(int *)result = ad->ad_magic;
        break;
    case ACPI_IVAR_PRIVATE:
        *(void **)result = ad->ad_private;
        break;
    case ISA_IVAR_VENDORID:
    case ISA_IVAR_SERIAL:
    case ISA_IVAR_COMPATID:
        *(int *)result = -1;
        break;
    case ISA_IVAR_LOGICALID:
        *(int *)result = acpi_isa_get_logicalid(child);
        break;
    default:
        return (ENOENT);
    }

    return (0);
}

static int
acpi_write_ivar(device_t dev, device_t child, int index, uintptr_t value)
{
    struct acpi_device  *ad;

    if ((ad = device_get_ivars(child)) == NULL) {
        kprintf("device has no ivars\n");
        return (ENOENT);
    }

    switch(index) {
    case ACPI_IVAR_HANDLE:
        ad->ad_handle = (ACPI_HANDLE)value;
        break;
    case ACPI_IVAR_MAGIC:
        ad->ad_magic = (int)value;
        break;
    case ACPI_IVAR_PRIVATE:
        ad->ad_private = (void *)value;
        break;
    default:
        panic("bad ivar write request (%d)", index);
        return (ENOENT);
    }

    return (0);
}

/*
 * Handle child resource allocation/removal
 */
static int
acpi_set_resource(device_t dev, device_t child, int type, int rid,
                  u_long start, u_long count)
{
    struct acpi_device          *ad = device_get_ivars(child);
    struct resource_list        *rl = &ad->ad_rl;

    resource_list_add(rl, type, rid, start, start + count -1, count);

    return(0);
}

static int
acpi_get_resource(device_t dev, device_t child, int type, int rid,
                  u_long *startp, u_long *countp)
{
    struct acpi_device          *ad = device_get_ivars(child);
    struct resource_list        *rl = &ad->ad_rl;
    struct resource_list_entry  *rle;

    rle = resource_list_find(rl, type, rid);
    if (!rle)
        return(ENOENT);
        
    if (startp)
        *startp = rle->start;
    if (countp)
        *countp = rle->count;

    return (0);
}

static struct resource *
acpi_alloc_resource(device_t bus, device_t child, int type, int *rid,
                    u_long start, u_long end, u_long count, u_int flags)
{
    struct acpi_device *ad = device_get_ivars(child);
    struct resource_list *rl = &ad->ad_rl;

    return (resource_list_alloc(rl, bus, child, type, rid, start, end, count,
            flags));
}

static int
acpi_release_resource(device_t bus, device_t child, int type, int rid, struct resource *r)
{
    struct acpi_device *ad = device_get_ivars(child);
    struct resource_list *rl = &ad->ad_rl;

    return (resource_list_release(rl, bus, child, type, rid, r));
}

/* Allocate an IO port or memory resource, given its GAS. */
struct resource *
acpi_bus_alloc_gas(device_t dev, int *rid, ACPI_GENERIC_ADDRESS *gas)
{
    int type;

    if (gas == NULL || !ACPI_VALID_ADDRESS(gas->Address) ||
        gas->RegisterBitWidth < 8)
        return (NULL);

    switch (gas->AddressSpaceId) {
    case ACPI_ADR_SPACE_SYSTEM_MEMORY:
        type = SYS_RES_MEMORY;
        break;
    case ACPI_ADR_SPACE_SYSTEM_IO:
        type = SYS_RES_IOPORT;
        break;
    default:
        return (NULL);
    }

    bus_set_resource(dev, type, *rid, gas->Address, gas->RegisterBitWidth / 8);
    return (bus_alloc_resource_any(dev, type, rid, RF_ACTIVE));
}

/*
 * Handle ISA-like devices probing for a PnP ID to match.
 */
#define PNP_EISAID(s)                           \
        ((((s[0] - '@') & 0x1f) << 2)           \
         | (((s[1] - '@') & 0x18) >> 3)         \
         | (((s[1] - '@') & 0x07) << 13)        \
         | (((s[2] - '@') & 0x1f) << 8)         \
         | (PNP_HEXTONUM(s[4]) << 16)           \
         | (PNP_HEXTONUM(s[3]) << 20)           \
         | (PNP_HEXTONUM(s[6]) << 24)           \
         | (PNP_HEXTONUM(s[5]) << 28))

static uint32_t
acpi_isa_get_logicalid(device_t dev)
{
    ACPI_DEVICE_INFO    *devinfo;
    ACPI_BUFFER         buf;
    ACPI_HANDLE         h;
    ACPI_STATUS         error;
    u_int32_t           pnpid;
    ACPI_LOCK_DECL;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    pnpid = 0;
    buf.Pointer = NULL;
    buf.Length = ACPI_ALLOCATE_BUFFER;

    ACPI_LOCK;
    
    /* Fetch and validate the HID. */
    if ((h = acpi_get_handle(dev)) == NULL)
        goto out;
    error = AcpiGetObjectInfo(h, &buf);
    if (ACPI_FAILURE(error))
        goto out;
    devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;

    if ((devinfo->Valid & ACPI_VALID_HID) != 0)
        pnpid = PNP_EISAID(devinfo->HardwareId.Value);

out:
    if (buf.Pointer != NULL)
        AcpiOsFree(buf.Pointer);
    ACPI_UNLOCK;
    return_VALUE (pnpid);
}

static int
acpi_isa_get_compatid(device_t dev, uint32_t *cids, int count)
{
    ACPI_DEVICE_INFO    *devinfo;
    ACPI_BUFFER         buf;
    ACPI_HANDLE         h;
    ACPI_STATUS         error;
    uint32_t            *pnpid;
    int                 valid, i;
    ACPI_LOCK_DECL;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    pnpid = cids;
    valid = 0;
    buf.Pointer = NULL;
    buf.Length = ACPI_ALLOCATE_BUFFER;

    ACPI_LOCK;
    
    /* Fetch and validate the CID */
    if ((h = acpi_get_handle(dev)) == NULL)
        goto out;
    error = AcpiGetObjectInfo(h, &buf);
    if (ACPI_FAILURE(error))
        goto out;
    devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;
    if ((devinfo->Valid & ACPI_VALID_CID) == 0)
        goto out;

    if (devinfo->CompatibilityId.Count < count)
        count = devinfo->CompatibilityId.Count;
    for (i = 0; i < count; i++) {
        if (strncmp(devinfo->CompatibilityId.Id[i].Value, "PNP", 3) != 0)
            continue;
        *pnpid++ = PNP_EISAID(devinfo->CompatibilityId.Id[i].Value);
        valid++;
    }

out:
    if (buf.Pointer != NULL)
        AcpiOsFree(buf.Pointer);
    ACPI_UNLOCK;
    return_VALUE (valid);
}

static int
acpi_isa_pnp_probe(device_t bus, device_t child, struct isa_pnp_id *ids)
{
    int                 result, cid_count, i;
    uint32_t            lid, cids[8];

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    /*
     * ISA-style drivers attached to ACPI may persist and
     * probe manually if we return ENOENT.  We never want
     * that to happen, so don't ever return it.
     */
    result = ENXIO;

    /* Scan the supplied IDs for a match */
    lid = acpi_isa_get_logicalid(child);
    cid_count = acpi_isa_get_compatid(child, cids, 8);
    while (ids && ids->ip_id) {
        if (lid == ids->ip_id) {
            result = 0;
            goto out;
        }
        for (i = 0; i < cid_count; i++) {
            if (cids[i] == ids->ip_id) {
                result = 0;
                goto out;
            }
        }
        ids++;
    }

 out:
    return_VALUE (result);
}

/*
 * Scan relevant portions of the ACPI namespace and attach child devices.
 *
 * Note that we only expect to find devices in the \_PR_, \_TZ_, \_SI_ and
 * \_SB_ scopes, and \_PR_ and \_TZ_ become obsolete in the ACPI 2.0 spec.
 */
static void
acpi_probe_children(device_t bus)
{
    ACPI_HANDLE parent;
    ACPI_STATUS status;
    static char *scopes[] = {"\\_PR_", "\\_TZ_", "\\_SI", "\\_SB_", NULL};
    int         i;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
    ACPI_ASSERTLOCK;

    /* Create any static children by calling device identify methods. */
    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "device identify routines\n"));
    bus_generic_probe(bus);

    /*
     * Scan the namespace and insert placeholders for all the devices that
     * we find.
     *
     * Note that we use AcpiWalkNamespace rather than AcpiGetDevices because
     * we want to create nodes for all devices, not just those that are
     * currently present. (This assumes that we don't want to create/remove
     * devices as they appear, which might be smarter.)
     */
    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "namespace scan\n"));
    for (i = 0; scopes[i] != NULL; i++) {
        status = AcpiGetHandle(ACPI_ROOT_OBJECT, scopes[i], &parent);
        if (ACPI_SUCCESS(status)) {
            AcpiWalkNamespace(ACPI_TYPE_ANY, parent, 100, acpi_probe_child,
                              bus, NULL);
        }
    }

    /*
     * Scan all of the child devices we have created and let them probe/attach.
     */
    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "first bus_generic_attach\n"));
    bus_generic_attach(bus);

    /*
     * Some of these children may have attached others as part of their attach
     * process (eg. the root PCI bus driver), so rescan.
     */
    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "second bus_generic_attach\n"));
    bus_generic_attach(bus);

    /* Attach wake sysctls. */
    acpi_wake_sysctl_walk(bus);

    ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "done attaching children\n"));
    return_VOID;
}

/*
 * Evaluate a child device and determine whether we might attach a device to
 * it.
 */
static ACPI_STATUS
acpi_probe_child(ACPI_HANDLE handle, UINT32 level, void *context, void **status)
{
    ACPI_OBJECT_TYPE    type;
    device_t            child, bus = (device_t)context;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    /* Skip this device if we think we'll have trouble with it. */
    if (acpi_avoid(handle)) {
        ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "not scanning '%s'\n",
                         acpi_name(handle)));
        return_ACPI_STATUS (AE_OK);
    }

    if (ACPI_SUCCESS(AcpiGetType(handle, &type))) {
        switch(type) {
        case ACPI_TYPE_DEVICE:
        case ACPI_TYPE_PROCESSOR:
        case ACPI_TYPE_THERMAL:
        case ACPI_TYPE_POWER:
            if (acpi_disabled("children"))
                break;

            /* 
             * Create a placeholder device for this node.  Sort the placeholder
             * so that the probe/attach passes will run breadth-first.
             */
            ACPI_DEBUG_PRINT((ACPI_DB_OBJECTS, "scanning '%s'\n",
                             acpi_name(handle)));
            child = BUS_ADD_CHILD(bus, bus, level * 10, NULL, -1);
            if (child == NULL)
                break;
            acpi_set_handle(child, handle);

            /* Check if the device can generate wake events. */
            if (ACPI_SUCCESS(AcpiEvaluateObject(handle, "_PRW", NULL, NULL)))
                device_set_flags(child, ACPI_FLAG_WAKE_CAPABLE);

            /*
             * Check that the device is present.  If it's not present,
             * leave it disabled (so that we have a device_t attached to
             * the handle, but we don't probe it).
             */
            if (type == ACPI_TYPE_DEVICE && !acpi_DeviceIsPresent(child)) {
                device_disable(child);
                break;
            }

            /*
             * Get the device's resource settings and attach them.
             * Note that if the device has _PRS but no _CRS, we need
             * to decide when it's appropriate to try to configure the
             * device.  Ignore the return value here; it's OK for the
             * device not to have any resources.
             */
            acpi_parse_resources(child, handle, &acpi_res_parse_set, NULL);

            /* If we're debugging, probe/attach now rather than later */
            ACPI_DEBUG_EXEC(device_probe_and_attach(child));
            break;
        }
    }

    return_ACPI_STATUS (AE_OK);
}

static void
acpi_shutdown_pre_sync(void *arg, int howto)
{
    struct acpi_softc *sc = arg;

    ACPI_ASSERTLOCK;

    /*
     * Disable all ACPI events before soft off, otherwise the system
     * will be turned on again on some laptops.
     *
     * XXX this should probably be restricted to masking some events just
     *     before powering down, since we may still need ACPI during the
     *     shutdown process.
     */
    if (sc->acpi_disable_on_poweroff)
        acpi_Disable(sc);
}

static void
acpi_shutdown_final(void *arg, int howto)
{
    ACPI_STATUS status;
    ACPI_ASSERTLOCK;

    /*
     * If powering off, run the actual shutdown code on each processor.
     * It will only perform the shutdown on the BSP.  Some chipsets do
     * not power off the system correctly if called from an AP.
     */
    if ((howto & RB_POWEROFF) != 0) {
        status = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
        if (ACPI_FAILURE(status)) {
            kprintf("AcpiEnterSleepStatePrep failed - %s\n",
                   AcpiFormatException(status));
            return;
        }
        kprintf("Powering system off using ACPI\n");
        acpi_shutdown_poweroff(NULL);
    } else {
        kprintf("Shutting down ACPI\n");
        AcpiTerminate();
    }
}

/*
 * Since this function may be called with locks held or in an unknown
 * context, it cannot allocate memory, acquire locks, sleep, etc.
 */
static void
acpi_shutdown_poweroff(void *arg)
{
    ACPI_STATUS status;

    ACPI_ASSERTLOCK;

    /* Only attempt to power off if this is the BSP (cpuid 0). */
    if (mdcpu->mi.gd_cpuid != 0)
        return;

    ACPI_DISABLE_IRQS();
    status = AcpiEnterSleepState(ACPI_STATE_S5);
    if (ACPI_FAILURE(status)) {
        kprintf("ACPI power-off failed - %s\n", AcpiFormatException(status));
    } else {
        DELAY(1000000);
        kprintf("ACPI power-off failed - timeout\n");
    }
}

static void
acpi_enable_fixed_events(struct acpi_softc *sc)
{
    static int  first_time = 1;

    ACPI_ASSERTLOCK;

    /* Enable and clear fixed events and install handlers. */
    if (AcpiGbl_FADT != NULL && AcpiGbl_FADT->PwrButton == 0) {
        AcpiClearEvent(ACPI_EVENT_POWER_BUTTON);
        AcpiInstallFixedEventHandler(ACPI_EVENT_POWER_BUTTON,
                                     acpi_event_power_button_sleep, sc);
        if (first_time)
            device_printf(sc->acpi_dev, "Power Button (fixed)\n");
    }
    if (AcpiGbl_FADT != NULL && AcpiGbl_FADT->SleepButton == 0) {
        AcpiClearEvent(ACPI_EVENT_SLEEP_BUTTON);
        AcpiInstallFixedEventHandler(ACPI_EVENT_SLEEP_BUTTON,
                                     acpi_event_sleep_button_sleep, sc);
        if (first_time)
            device_printf(sc->acpi_dev, "Sleep Button (fixed)\n");
    }

    first_time = 0;
}

/*
 * Returns true if the device is actually present and should
 * be attached to.  This requires the present, enabled, UI-visible 
 * and diagnostics-passed bits to be set.
 */
BOOLEAN
acpi_DeviceIsPresent(device_t dev)
{
    ACPI_DEVICE_INFO    *devinfo;
    ACPI_HANDLE         h;
    ACPI_BUFFER         buf;
    ACPI_STATUS         error;
    int                 ret;

    ACPI_ASSERTLOCK;
    
    ret = FALSE;
    if ((h = acpi_get_handle(dev)) == NULL)
        return (FALSE);
    buf.Pointer = NULL;
    buf.Length = ACPI_ALLOCATE_BUFFER;
    error = AcpiGetObjectInfo(h, &buf);
    if (ACPI_FAILURE(error))
        return (FALSE);
    devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;

    /* If no _STA method, must be present */
    if ((devinfo->Valid & ACPI_VALID_STA) == 0)
        ret = TRUE;

    /* Return true for 'present' and 'functioning' */
    if ((devinfo->CurrentStatus & 0x9) == 0x9)
        ret = TRUE;

    AcpiOsFree(buf.Pointer);
    return (ret);
}

/*
 * Returns true if the battery is actually present and inserted.
 */
BOOLEAN
acpi_BatteryIsPresent(device_t dev)
{
    ACPI_DEVICE_INFO    *devinfo;
    ACPI_HANDLE         h;
    ACPI_BUFFER         buf;
    ACPI_STATUS         error;
    int                 ret;

    ACPI_ASSERTLOCK;
    
    ret = FALSE;
    if ((h = acpi_get_handle(dev)) == NULL)
        return (FALSE);
    buf.Pointer = NULL;
    buf.Length = ACPI_ALLOCATE_BUFFER;
    error = AcpiGetObjectInfo(h, &buf);
    if (ACPI_FAILURE(error))
        return (FALSE);
    devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;

    /* If no _STA method, must be present */
    if ((devinfo->Valid & ACPI_VALID_STA) == 0)
        ret = TRUE;

    /* Return true for 'present' and 'functioning' */
    if ((devinfo->CurrentStatus & 0x19) == 0x19)
        ret = TRUE;

    AcpiOsFree(buf.Pointer);
    return (ret);
}

/*
 * Match a HID string against a device
 */
BOOLEAN
acpi_MatchHid(device_t dev, char *hid) 
{
    ACPI_DEVICE_INFO    *devinfo;
    ACPI_HANDLE         h;
    ACPI_BUFFER         buf;
    ACPI_STATUS         error;
    int                 ret, i;

    ACPI_ASSERTLOCK;

    ret = FALSE;
    if (hid == NULL)
        return (FALSE);
    if ((h = acpi_get_handle(dev)) == NULL)
        return (FALSE);
    buf.Pointer = NULL;
    buf.Length = ACPI_ALLOCATE_BUFFER;
    error = AcpiGetObjectInfo(h, &buf);
    if (ACPI_FAILURE(error))
        return (FALSE);
    devinfo = (ACPI_DEVICE_INFO *)buf.Pointer;

    if ((devinfo->Valid & ACPI_VALID_HID) != 0 &&
        strcmp(hid, devinfo->HardwareId.Value) == 0)
            ret = TRUE;
    else if ((devinfo->Valid & ACPI_VALID_CID) != 0) {
        for (i = 0; i < devinfo->CompatibilityId.Count; i++) {
            if (strcmp(hid, devinfo->CompatibilityId.Id[i].Value) == 0) {
                ret = TRUE;
                break;
            }
        }
    }

    AcpiOsFree(buf.Pointer);
    return (ret);
}

/*
 * Return the handle of a named object within our scope, ie. that of (parent)
 * or one if its parents.
 */
ACPI_STATUS
acpi_GetHandleInScope(ACPI_HANDLE parent, char *path, ACPI_HANDLE *result)
{
    ACPI_HANDLE         r;
    ACPI_STATUS         status;

    ACPI_ASSERTLOCK;

    /* Walk back up the tree to the root */
    for (;;) {
        status = AcpiGetHandle(parent, path, &r);
        if (ACPI_SUCCESS(status)) {
            *result = r;
            return (AE_OK);
        }
        if (status != AE_NOT_FOUND)
            return (AE_OK);
        if (ACPI_FAILURE(AcpiGetParent(parent, &r)))
            return (AE_NOT_FOUND);
        parent = r;
    }
}

/* Find the difference between two PM tick counts. */
uint32_t
acpi_TimerDelta(uint32_t end, uint32_t start)
{
    uint32_t delta;

    if (end >= start)
        delta = end - start;
    else if (AcpiGbl_FADT->TmrValExt == 0)
        delta = ((0x00FFFFFF - start) + end + 1) & 0x00FFFFFF;
    else
        delta = ((0xFFFFFFFF - start) + end + 1);
    return (delta);
}

/*
 * Allocate a buffer with a preset data size.
 */
ACPI_BUFFER *
acpi_AllocBuffer(int size)
{
    ACPI_BUFFER *buf;

    buf = kmalloc(size + sizeof(*buf), M_ACPIDEV, M_INTWAIT);
    buf->Length = size;
    buf->Pointer = (void *)(buf + 1);
    return (buf);
}

ACPI_STATUS
acpi_SetInteger(ACPI_HANDLE handle, char *path, UINT32 number)
{
    ACPI_OBJECT arg1;
    ACPI_OBJECT_LIST args;

    ACPI_ASSERTLOCK;

    arg1.Type = ACPI_TYPE_INTEGER;
    arg1.Integer.Value = number;
    args.Count = 1;
    args.Pointer = &arg1;

    return (AcpiEvaluateObject(handle, path, &args, NULL));
}

/*
 * Evaluate a path that should return an integer.
 */
ACPI_STATUS
acpi_GetInteger(ACPI_HANDLE handle, char *path, UINT32 *number)
{
    ACPI_STATUS status;
    ACPI_BUFFER buf;
    ACPI_OBJECT param;

    ACPI_ASSERTLOCK;

    if (handle == NULL)
        handle = ACPI_ROOT_OBJECT;

    /*
     * Assume that what we've been pointed at is an Integer object, or
     * a method that will return an Integer.
     */
    buf.Pointer = &param;
    buf.Length = sizeof(param);
    status = AcpiEvaluateObject(handle, path, NULL, &buf);
    if (ACPI_SUCCESS(status)) {
        if (param.Type == ACPI_TYPE_INTEGER)
            *number = param.Integer.Value;
        else
            status = AE_TYPE;
    }

    /* 
     * In some applications, a method that's expected to return an Integer
     * may instead return a Buffer (probably to simplify some internal
     * arithmetic).  We'll try to fetch whatever it is, and if it's a Buffer,
     * convert it into an Integer as best we can.
     *
     * This is a hack.
     */
    if (status == AE_BUFFER_OVERFLOW) {
        if ((buf.Pointer = AcpiOsAllocate(buf.Length)) == NULL) {
            status = AE_NO_MEMORY;
        } else {
            status = AcpiEvaluateObject(handle, path, NULL, &buf);
            if (ACPI_SUCCESS(status))
                status = acpi_ConvertBufferToInteger(&buf, number);
            AcpiOsFree(buf.Pointer);
        }
    }
    return (status);
}

ACPI_STATUS
acpi_ConvertBufferToInteger(ACPI_BUFFER *bufp, UINT32 *number)
{
    ACPI_OBJECT *p;
    UINT8       *val;
    int         i;

    p = (ACPI_OBJECT *)bufp->Pointer;
    if (p->Type == ACPI_TYPE_INTEGER) {
        *number = p->Integer.Value;
        return (AE_OK);
    }
    if (p->Type != ACPI_TYPE_BUFFER)
        return (AE_TYPE);
    if (p->Buffer.Length > sizeof(int))
        return (AE_BAD_DATA);

    *number = 0;
    val = p->Buffer.Pointer;
    for (i = 0; i < p->Buffer.Length; i++)
        *number += val[i] << (i * 8);
    return (AE_OK);
}

/*
 * Iterate over the elements of an a package object, calling the supplied
 * function for each element.
 *
 * XXX possible enhancement might be to abort traversal on error.
 */
ACPI_STATUS
acpi_ForeachPackageObject(ACPI_OBJECT *pkg,
        void (*func)(ACPI_OBJECT *comp, void *arg), void *arg)
{
    ACPI_OBJECT *comp;
    int         i;
    
    if (pkg == NULL || pkg->Type != ACPI_TYPE_PACKAGE)
        return (AE_BAD_PARAMETER);

    /* Iterate over components */
    i = 0;
    comp = pkg->Package.Elements;
    for (; i < pkg->Package.Count; i++, comp++)
        func(comp, arg);

    return (AE_OK);
}

/*
 * Find the (index)th resource object in a set.
 */
ACPI_STATUS
acpi_FindIndexedResource(ACPI_BUFFER *buf, int index, ACPI_RESOURCE **resp)
{
    ACPI_RESOURCE       *rp;
    int                 i;

    rp = (ACPI_RESOURCE *)buf->Pointer;
    i = index;
    while (i-- > 0) {
        /* Range check */       
        if (rp > (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
            return (AE_BAD_PARAMETER);

        /* Check for terminator */
        if (rp->Id == ACPI_RSTYPE_END_TAG || rp->Length == 0)
            return (AE_NOT_FOUND);
        rp = ACPI_NEXT_RESOURCE(rp);
    }
    if (resp != NULL)
        *resp = rp;

    return (AE_OK);
}

/*
 * Append an ACPI_RESOURCE to an ACPI_BUFFER.
 *
 * Given a pointer to an ACPI_RESOURCE structure, expand the ACPI_BUFFER
 * provided to contain it.  If the ACPI_BUFFER is empty, allocate a sensible
 * backing block.  If the ACPI_RESOURCE is NULL, return an empty set of
 * resources.
 */
#define ACPI_INITIAL_RESOURCE_BUFFER_SIZE       512

ACPI_STATUS
acpi_AppendBufferResource(ACPI_BUFFER *buf, ACPI_RESOURCE *res)
{
    ACPI_RESOURCE       *rp;
    void                *newp;
    
    /* Initialise the buffer if necessary. */
    if (buf->Pointer == NULL) {
        buf->Length = ACPI_INITIAL_RESOURCE_BUFFER_SIZE;
        if ((buf->Pointer = AcpiOsAllocate(buf->Length)) == NULL)
            return (AE_NO_MEMORY);
        rp = (ACPI_RESOURCE *)buf->Pointer;
        rp->Id = ACPI_RSTYPE_END_TAG;
        rp->Length = 0;
    }
    if (res == NULL)
        return (AE_OK);
    
    /*
     * Scan the current buffer looking for the terminator.
     * This will either find the terminator or hit the end
     * of the buffer and return an error.
     */
    rp = (ACPI_RESOURCE *)buf->Pointer;
    for (;;) {
        /* Range check, don't go outside the buffer */
        if (rp >= (ACPI_RESOURCE *)((u_int8_t *)buf->Pointer + buf->Length))
            return (AE_BAD_PARAMETER);
        if (rp->Id == ACPI_RSTYPE_END_TAG || rp->Length == 0)
            break;
        rp = ACPI_NEXT_RESOURCE(rp);
    }

    /*
     * Check the size of the buffer and expand if required.
     *
     * Required size is:
     *  size of existing resources before terminator + 
     *  size of new resource and header +
     *  size of terminator.
     *
     * Note that this loop should really only run once, unless
     * for some reason we are stuffing a *really* huge resource.
     */
    while ((((u_int8_t *)rp - (u_int8_t *)buf->Pointer) + 
            res->Length + ACPI_RESOURCE_LENGTH_NO_DATA +
            ACPI_RESOURCE_LENGTH) >= buf->Length) {
        if ((newp = AcpiOsAllocate(buf->Length * 2)) == NULL)
            return (AE_NO_MEMORY);
        bcopy(buf->Pointer, newp, buf->Length);
        rp = (ACPI_RESOURCE *)((u_int8_t *)newp +
                               ((u_int8_t *)rp - (u_int8_t *)buf->Pointer));
        AcpiOsFree(buf->Pointer);
        buf->Pointer = newp;
        buf->Length += buf->Length;
    }
    
    /* Insert the new resource. */
    bcopy(res, rp, res->Length + ACPI_RESOURCE_LENGTH_NO_DATA);
    
    /* And add the terminator. */
    rp = ACPI_NEXT_RESOURCE(rp);
    rp->Id = ACPI_RSTYPE_END_TAG;
    rp->Length = 0;

    return (AE_OK);
}

/*
 * Set interrupt model.
 */
ACPI_STATUS
acpi_SetIntrModel(int model)
{
    return (acpi_SetInteger(ACPI_ROOT_OBJECT, "_PIC", model));
}

#define ACPI_MINIMUM_AWAKETIME  5

static void
acpi_sleep_enable(void *arg)
{
    ((struct acpi_softc *)arg)->acpi_sleep_disabled = 0;
}

/*
 * Set the system sleep state
 *
 * Currently we support S1-S5 but S4 is only S4BIOS
 */
ACPI_STATUS
acpi_SetSleepState(struct acpi_softc *sc, int state)
{
    ACPI_STATUS status = AE_OK;
    UINT8       TypeA;
    UINT8       TypeB;

    ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);
    ACPI_ASSERTLOCK;

    /* Avoid reentry if already attempting to suspend. */
    if (sc->acpi_sstate != ACPI_STATE_S0)
        return_ACPI_STATUS (AE_BAD_PARAMETER);

    /* We recently woke up so don't suspend again for a while. */
    if (sc->acpi_sleep_disabled)
        return_ACPI_STATUS (AE_OK);

    switch (state) {
    case ACPI_STATE_S1:
    case ACPI_STATE_S2:
    case ACPI_STATE_S3:
    case ACPI_STATE_S4:
        status = AcpiGetSleepTypeData((UINT8)state, &TypeA, &TypeB);
        if (status == AE_NOT_FOUND) {
            device_printf(sc->acpi_dev,
                          "Sleep state S%d not supported by BIOS\n", state);
            break;
        } else if (ACPI_FAILURE(status)) {
            device_printf(sc->acpi_dev, "AcpiGetSleepTypeData failed - %s\n",
                          AcpiFormatException(status));
            break;
        }

        sc->acpi_sstate = state;
        sc->acpi_sleep_disabled = 1;

        /* Disable all wake GPEs not appropriate for this state. */
        acpi_wake_limit_walk(state);

        /* Inform all devices that we are going to sleep. */
        if (DEVICE_SUSPEND(root_bus) != 0) {
            /*
             * Re-wake the system.
             *
             * XXX note that a better two-pass approach with a 'veto' pass
             *     followed by a "real thing" pass would be better, but the
             *     current bus interface does not provide for this.
             */
            DEVICE_RESUME(root_bus);
            return_ACPI_STATUS (AE_ERROR);
        }

        status = AcpiEnterSleepStatePrep(state);
        if (ACPI_FAILURE(status)) {
            device_printf(sc->acpi_dev, "AcpiEnterSleepStatePrep failed - %s\n",
                          AcpiFormatException(status));
            break;
        }

        if (sc->acpi_sleep_delay > 0)
            DELAY(sc->acpi_sleep_delay * 1000000);

        if (state != ACPI_STATE_S1) {
            acpi_sleep_machdep(sc, state);

            /* AcpiEnterSleepState() may be incomplete, unlock if locked. */
            if (AcpiGbl_MutexInfo[ACPI_MTX_HARDWARE].OwnerId !=
                ACPI_MUTEX_NOT_ACQUIRED) {

                AcpiUtReleaseMutex(ACPI_MTX_HARDWARE);
            }

            /* Re-enable ACPI hardware on wakeup from sleep state 4. */
            if (state == ACPI_STATE_S4)
                AcpiEnable();
        } else {
            status = AcpiEnterSleepState((UINT8)state);
            if (ACPI_FAILURE(status)) {
                device_printf(sc->acpi_dev, "AcpiEnterSleepState failed - %s\n",
                              AcpiFormatException(status));
                break;
            }
        }
        AcpiLeaveSleepState((UINT8)state);
        DEVICE_RESUME(root_bus);
        sc->acpi_sstate = ACPI_STATE_S0;
        acpi_enable_fixed_events(sc);
        break;
    case ACPI_STATE_S5:
        /*
         * Shut down cleanly and power off.  This will call us back through the
         * shutdown handlers.
         */
        shutdown_nice(RB_POWEROFF);
        break;
    case ACPI_STATE_S0:
    default:
        status = AE_BAD_PARAMETER;
        break;
    }

    /* Disable a second sleep request for a short period */
    if (sc->acpi_sleep_disabled)
        callout_reset(&sc->acpi_sleep_timer, hz * ACPI_MINIMUM_AWAKETIME,
                      acpi_sleep_enable, sc);

    return_ACPI_STATUS (status);
}

/* Initialize a device's wake GPE. */
int
acpi_wake_init(device_t dev, int type)
{
    struct acpi_prw_data prw;

    /* Check that the device can wake the system. */
    if ((device_get_flags(dev) & ACPI_FLAG_WAKE_CAPABLE) == 0)
        return (ENXIO);

    /* Evaluate _PRW to find the GPE. */
    if (acpi_parse_prw(acpi_get_handle(dev), &prw) != 0)
        return (ENXIO);

    /* Set the requested type for the GPE (runtime, wake, or both). */
    if (ACPI_FAILURE(AcpiSetGpeType(prw.gpe_handle, prw.gpe_bit, type))) {
        device_printf(dev, "set GPE type failed\n");
        return (ENXIO);
    }

    return (0);
}

/* Enable or disable the device's wake GPE. */
int
acpi_wake_set_enable(device_t dev, int enable)
{
    struct acpi_prw_data prw;
    ACPI_HANDLE handle;
    ACPI_STATUS status;
    int flags;

    /* Make sure the device supports waking the system. */
    flags = device_get_flags(dev);
    handle = acpi_get_handle(dev);
    if ((flags & ACPI_FLAG_WAKE_CAPABLE) == 0 || handle == NULL)
        return (ENXIO);

    /* Evaluate _PRW to find the GPE. */
    if (acpi_parse_prw(handle, &prw) != 0)
        return (ENXIO);

    if (enable) {
        status = AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
        if (ACPI_FAILURE(status)) {
            device_printf(dev, "enable wake failed\n");
            return (ENXIO);
        }
        device_set_flags(dev, flags | ACPI_FLAG_WAKE_ENABLED);
    } else {
        status = AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
        if (ACPI_FAILURE(status)) {
            device_printf(dev, "disable wake failed\n");
            return (ENXIO);
        }
        device_set_flags(dev, flags & ~ACPI_FLAG_WAKE_ENABLED);
    }

    return (0);
}

/* Configure a device's GPE appropriately for the new sleep state. */
int
acpi_wake_sleep_prep(device_t dev, int sstate)
{
    struct acpi_prw_data prw;
    ACPI_HANDLE handle;
    int flags;

    /* Check that this is an ACPI device and get its GPE. */
    flags = device_get_flags(dev);
    handle = acpi_get_handle(dev);
    if ((flags & ACPI_FLAG_WAKE_CAPABLE) == 0 || handle == NULL)
        return (ENXIO);

    /* Evaluate _PRW to find the GPE. */
    if (acpi_parse_prw(handle, &prw) != 0)
        return (ENXIO);

    /*
     * TBD: All Power Resources referenced by elements 2 through N
     *      of the _PRW object are put into the ON state.
     */

    /*
     * If the user requested that this device wake the system and the next
     * sleep state is valid for this GPE, enable it and the device's wake
     * capability.  The sleep state must be less than (i.e., higher power)
     * or equal to the value specified by _PRW.  Return early, leaving
     * the appropriate power resources enabled.
     */
    if ((flags & ACPI_FLAG_WAKE_ENABLED) != 0 &&
        sstate <= prw.lowest_wake) {
        if (bootverbose)
            device_printf(dev, "wake_prep enabled gpe %#x for state %d\n",
                prw.gpe_bit, sstate);
        AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
        acpi_SetInteger(handle, "_PSW", 1);
        return (0);
    }

    /*
     * If the device wake was disabled or this sleep state is too low for
     * this device, disable its wake capability and GPE.
     */
    AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
    acpi_SetInteger(handle, "_PSW", 0);
    if (bootverbose)
        device_printf(dev, "wake_prep disabled gpe %#x for state %d\n",
            prw.gpe_bit, sstate);

    /*
     * TBD: All Power Resources referenced by elements 2 through N
     *      of the _PRW object are put into the OFF state.
     */

    return (0);
}

/* Re-enable GPEs after wake. */
int
acpi_wake_run_prep(device_t dev)
{
    struct acpi_prw_data prw;
    ACPI_HANDLE handle;
    int flags;

    /* Check that this is an ACPI device and get its GPE. */
    flags = device_get_flags(dev);
    handle = acpi_get_handle(dev);
    if ((flags & ACPI_FLAG_WAKE_CAPABLE) == 0 || handle == NULL)
        return (ENXIO);

    /* Evaluate _PRW to find the GPE. */
    if (acpi_parse_prw(handle, &prw) != 0)
        return (ENXIO);

    /*
     * TBD: Be sure all Power Resources referenced by elements 2 through N
     *      of the _PRW object are in the ON state.
     */

    /* Disable wake capability and if the user requested, enable the GPE. */
    acpi_SetInteger(handle, "_PSW", 0);
    if ((flags & ACPI_FLAG_WAKE_ENABLED) != 0)
        AcpiEnableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);
    return (0);
}

static ACPI_STATUS
acpi_wake_limit(ACPI_HANDLE h, UINT32 level, void *context, void **status)
{
    struct acpi_prw_data prw;
    int *sstate;

    /* It's ok not to have _PRW if the device can't wake the system. */
    if (acpi_parse_prw(h, &prw) != 0)
        return (AE_OK);

    sstate = (int *)context;
    if (*sstate > prw.lowest_wake)
        AcpiDisableGpe(prw.gpe_handle, prw.gpe_bit, ACPI_NOT_ISR);

    return (AE_OK);
}

/* Walk all system devices, disabling them if necessary for sstate. */
static int
acpi_wake_limit_walk(int sstate)
{
    ACPI_HANDLE sb_handle;

    if (ACPI_SUCCESS(AcpiGetHandle(ACPI_ROOT_OBJECT, "\\_SB_", &sb_handle)))
        AcpiWalkNamespace(ACPI_TYPE_ANY, sb_handle, 100,
            acpi_wake_limit, &sstate, NULL);
    return (0);
}

/* Walk the tree rooted at acpi0 to attach per-device wake sysctls. */
static int
acpi_wake_sysctl_walk(device_t dev)
{
    int error, i, numdevs;
    device_t *devlist;
    device_t child;

    error = device_get_children(dev, &devlist, &numdevs);
    if (error != 0 || numdevs == 0)
        return (error);
    for (i = 0; i < numdevs; i++) {
        child = devlist[i];
        if (!device_is_attached(child))
            continue;
        if (device_get_flags(child) & ACPI_FLAG_WAKE_CAPABLE) {
#ifdef dfly_notyet
            SYSCTL_ADD_PROC(device_get_sysctl_ctx(child),
                SYSCTL_CHILDREN(device_get_sysctl_tree(child)), OID_AUTO,
                "wake", CTLTYPE_INT | CTLFLAG_RW, child, 0,
                acpi_wake_set_sysctl, "I", "Device set to wake the system");
#endif /* dfly_notyet */
        }
        acpi_wake_sysctl_walk(child);
    }
    kfree(devlist, M_TEMP);

    return (0);
}

#ifdef dfly_notyet
/* Enable or disable wake from userland. */
static int
acpi_wake_set_sysctl(SYSCTL_HANDLER_ARGS)
{
    int enable, error;
    device_t dev;

    dev = (device_t)arg1;
    enable = (device_get_flags(dev) & ACPI_FLAG_WAKE_ENABLED) ? 1 : 0;

    error = sysctl_handle_int(oidp, &enable, 0, req);
    if (error != 0 || req->newptr == NULL)
        return (error);
    if (enable != 0 && enable != 1)
        return (EINVAL);

    return (acpi_wake_set_enable(dev, enable));
}
#endif /* dfly_notyet */

/* Parse a device's _PRW into a structure. */
static int
acpi_parse_prw(ACPI_HANDLE h, struct acpi_prw_data *prw)
{
    ACPI_STATUS                 status;
    ACPI_BUFFER                 prw_buffer;
    ACPI_OBJECT                 *res, *res2;
    int error;

    if (h == NULL || prw == NULL)
        return (EINVAL);

    /*
     * The _PRW object (7.2.9) is only required for devices that have the
     * ability to wake the system from a sleeping state.
     */
    error = EINVAL;
    prw_buffer.Pointer = NULL;
    prw_buffer.Length = ACPI_ALLOCATE_BUFFER;
    status = AcpiEvaluateObject(h, "_PRW", NULL, &prw_buffer);
    if (ACPI_FAILURE(status))
        return (ENOENT);
    res = (ACPI_OBJECT *)prw_buffer.Pointer;
    if (res == NULL)
        return (ENOENT);
    if (!ACPI_PKG_VALID(res, 2))
        goto out;

    /*
     * Element 1 of the _PRW object:
     * The lowest power system sleeping state that can be entered while still
     * providing wake functionality.  The sleeping state being entered must
     * be less than (i.e., higher power) or equal to this value.
     */
    if (acpi_PkgInt32(res, 1, &prw->lowest_wake) != 0)
        goto out;

    /*
     * Element 0 of the _PRW object:
     */
    switch (res->Package.Elements[0].Type) {
    case ACPI_TYPE_INTEGER:
        /*
         * If the data type of this package element is numeric, then this
         * _PRW package element is the bit index in the GPEx_EN, in the
         * GPE blocks described in the FADT, of the enable bit that is
         * enabled for the wake event.
         */
        prw->gpe_handle = NULL;
        prw->gpe_bit = res->Package.Elements[0].Integer.Value;
        error = 0;
        break;
    case ACPI_TYPE_PACKAGE:
        /*
         * If the data type of this package element is a package, then this
         * _PRW package element is itself a package containing two
         * elements.  The first is an object reference to the GPE Block
         * device that contains the GPE that will be triggered by the wake
         * event.  The second element is numeric and it contains the bit
         * index in the GPEx_EN, in the GPE Block referenced by the
         * first element in the package, of the enable bit that is enabled for
         * the wake event.
         *
         * For example, if this field is a package then it is of the form:
         * Package() {\_SB.PCI0.ISA.GPE, 2}
         */
        res2 = &res->Package.Elements[0];
        if (!ACPI_PKG_VALID(res2, 2))
            goto out;
        prw->gpe_handle = acpi_GetReference(NULL, &res2->Package.Elements[0]);
        if (prw->gpe_handle == NULL)
            goto out;
        if (acpi_PkgInt32(res2, 1, &prw->gpe_bit) != 0)
            goto out;
        error = 0;
        break;
    default:
        goto out;
    }

    /* XXX No power resource handling yet. */
    prw->power_res = NULL;

out:
    if (prw_buffer.Pointer != NULL)
        AcpiOsFree(prw_buffer.Pointer);
    return (error);
}

/*
 * Enable/Disable ACPI
 */
ACPI_STATUS
acpi_Enable(struct acpi_softc *sc)
{
    ACPI_STATUS status;
    u_int32_t   flags;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
    ACPI_ASSERTLOCK;

    flags = ACPI_NO_ADDRESS_SPACE_INIT | ACPI_NO_HARDWARE_INIT |
            ACPI_NO_DEVICE_INIT | ACPI_NO_OBJECT_INIT;
    if (!sc->acpi_enabled)
        status = AcpiEnableSubsystem(flags);
    else
        status = AE_OK;

    if (status == AE_OK)
        sc->acpi_enabled = 1;

    return_ACPI_STATUS (status);
}

ACPI_STATUS
acpi_Disable(struct acpi_softc *sc)
{
    ACPI_STATUS status;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
    ACPI_ASSERTLOCK;

    if (sc->acpi_enabled)
        status = AcpiDisable();
    else
        status = AE_OK;

    if (status == AE_OK)
        sc->acpi_enabled = 0;

    return_ACPI_STATUS (status);
}

/*
 * ACPI Event Handlers
 */

/* System Event Handlers (registered by EVENTHANDLER_REGISTER) */

static void
acpi_system_eventhandler_sleep(void *arg, int state)
{
    ACPI_LOCK_DECL;
    ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);

    ACPI_LOCK;
    if (state >= ACPI_STATE_S0 && state <= ACPI_S_STATES_MAX)
        acpi_SetSleepState((struct acpi_softc *)arg, state);
    ACPI_UNLOCK;
    return_VOID;
}

static void
acpi_system_eventhandler_wakeup(void *arg, int state)
{
    ACPI_LOCK_DECL;
    ACPI_FUNCTION_TRACE_U32((char *)(uintptr_t)__func__, state);

    /* Well, what to do? :-) */

    ACPI_LOCK;
    ACPI_UNLOCK;

    return_VOID;
}

/* 
 * ACPICA Event Handlers (FixedEvent, also called from button notify handler)
 */
UINT32
acpi_event_power_button_sleep(void *context)
{
    struct acpi_softc   *sc = (struct acpi_softc *)context;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_power_button_sx);

    return_VALUE (ACPI_INTERRUPT_HANDLED);
}

UINT32
acpi_event_power_button_wake(void *context)
{
    struct acpi_softc   *sc = (struct acpi_softc *)context;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_power_button_sx);

    return_VALUE (ACPI_INTERRUPT_HANDLED);
}

UINT32
acpi_event_sleep_button_sleep(void *context)
{
    struct acpi_softc   *sc = (struct acpi_softc *)context;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    EVENTHANDLER_INVOKE(acpi_sleep_event, sc->acpi_sleep_button_sx);

    return_VALUE (ACPI_INTERRUPT_HANDLED);
}

UINT32
acpi_event_sleep_button_wake(void *context)
{
    struct acpi_softc   *sc = (struct acpi_softc *)context;

    ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

    EVENTHANDLER_INVOKE(acpi_wakeup_event, sc->acpi_sleep_button_sx);

    return_VALUE (ACPI_INTERRUPT_HANDLED);
}

/*
 * XXX This is kinda ugly, and should not be here.
 */
struct acpi_staticbuf {
    ACPI_BUFFER buffer;
    char        data[512];
};

char *
acpi_name(ACPI_HANDLE handle)
{
    static struct acpi_staticbuf        buf;

    ACPI_ASSERTLOCK;

    buf.buffer.Length = 512;
    buf.buffer.Pointer = &buf.data[0];

    if (ACPI_SUCCESS(AcpiGetName(handle, ACPI_FULL_PATHNAME, &buf.buffer)))
        return (buf.buffer.Pointer);

    return ("(unknown path)");
}

/*
 * Debugging/bug-avoidance.  Avoid trying to fetch info on various
 * parts of the namespace.
 */
int
acpi_avoid(ACPI_HANDLE handle)
{
    char        *cp, *env, *np;
    int         len;

    np = acpi_name(handle);
    if (*np == '\\')
        np++;
    if ((env = kgetenv("debug.acpi.avoid.paths")) == NULL &&
        (env = kgetenv("debug.acpi.avoid")) == NULL)
        return (0);

    /* Scan the avoid list checking for a match */
    cp = env;
    for (;;) {
        while ((*cp != 0) && isspace(*cp))
            cp++;
        if (*cp == 0)
            break;
        len = 0;
        while ((cp[len] != 0) && !isspace(cp[len]))
            len++;
        if (!strncmp(cp, np, len)) {
            freeenv(env);
            return(1);
        }
        cp += len;
    }
    freeenv(env);

    return (0);
}

/*
 * Debugging/bug-avoidance.  Disable ACPI subsystem components.   Note that
 * some components may be disabled by default and can only be enabled
 * via acpi_enabled() (debug.acpi.enabled).
 */
int
acpi_disabled(char *subsys)
{
    char        *cp, *env;
    int         len;

    if ((env = kgetenv("debug.acpi.disabled")) == NULL)
        return (0);
    if (strcmp(env, "all") == 0) {
        freeenv(env);
        return (1);
    }

    /* Scan the disable list, checking for a match. */
    cp = env;
    for (;;) {
        while (*cp != '\0' && isspace(*cp))
            cp++;
        if (*cp == '\0')
            break;
        len = 0;
        while (cp[len] != '\0' && !isspace(cp[len]))
            len++;
        if (strncmp(cp, subsys, len) == 0) {
            freeenv(env);
            return (1);
        }
        cp += len;
    }
    freeenv(env);

    return (0);
}

/*
 * Debugging/bug-avoidance.  Enable ACPI subsystem components.  Most 
 * components are enabled by default.  The ones that are not have to be 
 * enabled via debug.acpi.enabled.
 */
int
acpi_enabled(char *subsys)
{
    char        *cp, *env;
    int         len;

    if ((env = kgetenv("debug.acpi.enabled")) == NULL)
        return (0);
    if (strcmp(env, "all") == 0) {
        freeenv(env);
        return (1);
    }

    /* Scan the enable list, checking for a match. */
    cp = env;
    for (;;) {
        while (*cp != '\0' && isspace(*cp))
            cp++;
        if (*cp == '\0')
            break;
        len = 0;
        while (cp[len] != '\0' && !isspace(cp[len]))
            len++;
        if (strncmp(cp, subsys, len) == 0) {
            freeenv(env);
            return (1);
        }
        cp += len;
    }
    freeenv(env);

    return (0);
}

/*
 * Control interface.
 *
 * We multiplex ioctls for all participating ACPI devices here.  Individual 
 * drivers wanting to be accessible via /dev/acpi should use the
 * register/deregister interface to make their handlers visible.
 */
struct acpi_ioctl_hook
{
    TAILQ_ENTRY(acpi_ioctl_hook) link;
    u_long                       cmd;
    acpi_ioctl_fn                fn;
    void                         *arg;
};

static TAILQ_HEAD(,acpi_ioctl_hook)     acpi_ioctl_hooks;
static int                              acpi_ioctl_hooks_initted;

/*
 * Register an ioctl handler.
 */
int
acpi_register_ioctl(u_long cmd, acpi_ioctl_fn fn, void *arg)
{
    struct acpi_ioctl_hook      *hp;

    hp = kmalloc(sizeof(*hp), M_ACPIDEV, M_INTWAIT);
    hp->cmd = cmd;
    hp->fn = fn;
    hp->arg = arg;
    if (acpi_ioctl_hooks_initted == 0) {
        TAILQ_INIT(&acpi_ioctl_hooks);
        acpi_ioctl_hooks_initted = 1;
    }
    TAILQ_INSERT_TAIL(&acpi_ioctl_hooks, hp, link);
    return (0);
}

/*
 * Deregister an ioctl handler.
 */
void    
acpi_deregister_ioctl(u_long cmd, acpi_ioctl_fn fn)
{
    struct acpi_ioctl_hook      *hp;

    TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link)
        if ((hp->cmd == cmd) && (hp->fn == fn))
            break;

    if (hp != NULL) {
        TAILQ_REMOVE(&acpi_ioctl_hooks, hp, link);
        kfree(hp, M_ACPIDEV);
    }
}

static int
acpiopen(struct dev_open_args *ap)
{
    return (0);
}

static int
acpiclose(struct dev_close_args *ap)
{
    return (0);
}

static int
acpiioctl(struct dev_ioctl_args *ap)
{
    struct acpi_softc           *sc;
    struct acpi_ioctl_hook      *hp;
    int                         error, xerror, state;
    ACPI_LOCK_DECL;

    ACPI_LOCK;

    error = state = 0;
    sc = ap->a_head.a_dev->si_drv1;

    /*
     * Scan the list of registered ioctls, looking for handlers.
     */
    if (acpi_ioctl_hooks_initted) {
        TAILQ_FOREACH(hp, &acpi_ioctl_hooks, link) {
            if (hp->cmd == ap->a_cmd) {
                xerror = hp->fn(ap->a_cmd, ap->a_data, hp->arg);
                if (xerror != 0)
                    error = xerror;
                goto out;
            }
        }
    }

    /*
     * Core ioctls are not permitted for non-writable user.
     * Currently, other ioctls just fetch information.
     * Not changing system behavior.
     */
    if((ap->a_fflag & FWRITE) == 0) {
        error = EPERM;
        goto out;
    }

    /* Core system ioctls. */
    switch (ap->a_cmd) {
    case ACPIIO_ENABLE:
        if (ACPI_FAILURE(acpi_Enable(sc)))
            error = ENXIO;
        break;
    case ACPIIO_DISABLE:
        if (ACPI_FAILURE(acpi_Disable(sc)))
            error = ENXIO;
        break;
    case ACPIIO_SETSLPSTATE:
        if (!sc->acpi_enabled) {
            error = ENXIO;
            break;
        }
        state = *(int *)ap->a_data;
        if (state >= ACPI_STATE_S0  && state <= ACPI_S_STATES_MAX) {
            if (ACPI_FAILURE(acpi_SetSleepState(sc, state)))
                error = EINVAL;
        } else {
            error = EINVAL;
        }
        break;
    default:
        if (error == 0)
            error = EINVAL;
        break;
    }

out:
    ACPI_UNLOCK;
    return (error);
}

static int
acpi_supported_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
{
    char sleep_state[4];
    char buf[16];
    int error;
    UINT8 state, TypeA, TypeB;

    buf[0] = '\0';
    for (state = ACPI_STATE_S1; state < ACPI_S_STATES_MAX + 1; state++) {
        if (ACPI_SUCCESS(AcpiGetSleepTypeData(state, &TypeA, &TypeB))) {
            ksprintf(sleep_state, "S%d ", state);
            strcat(buf, sleep_state);
        }
    }
    error = sysctl_handle_string(oidp, buf, sizeof(buf), req);
    return (error);
}

static int
acpi_sleep_state_sysctl(SYSCTL_HANDLER_ARGS)
{
    char sleep_state[10];
    int error;
    u_int new_state, old_state;

    old_state = *(u_int *)oidp->oid_arg1;
    if (old_state > ACPI_S_STATES_MAX + 1) {
        strcpy(sleep_state, "unknown");
    } else {
        bzero(sleep_state, sizeof(sleep_state));
        strncpy(sleep_state, sleep_state_names[old_state],
                sizeof(sleep_state_names[old_state]));
    }
    error = sysctl_handle_string(oidp, sleep_state, sizeof(sleep_state), req);
    if (error == 0 && req->newptr != NULL) {
        new_state = ACPI_STATE_S0;
        for (; new_state <= ACPI_S_STATES_MAX + 1; new_state++) {
            if (strncmp(sleep_state, sleep_state_names[new_state],
                        sizeof(sleep_state)) == 0)
                break;
        }
        if (new_state <= ACPI_S_STATES_MAX + 1) {
            if (new_state != old_state)
                *(u_int *)oidp->oid_arg1 = new_state;
        } else {
            error = EINVAL;
        }
    }

    return (error);
}

/* Inform devctl(4) when we receive a Notify. */
void
acpi_UserNotify(const char *subsystem, ACPI_HANDLE h, uint8_t notify)
{
    char                notify_buf[16];
    ACPI_BUFFER         handle_buf;
    ACPI_STATUS         status;

    if (subsystem == NULL)
        return;

    handle_buf.Pointer = NULL;
    handle_buf.Length = ACPI_ALLOCATE_BUFFER;
    status = AcpiNsHandleToPathname(h, &handle_buf);
    if (ACPI_FAILURE(status))
        return;
    ksnprintf(notify_buf, sizeof(notify_buf), "notify=0x%02x", notify);
#if 0
    devctl_notify("ACPI", subsystem, handle_buf.Pointer, notify_buf);
#endif
    AcpiOsFree(handle_buf.Pointer);
}

#ifdef ACPI_DEBUG
/*
 * Support for parsing debug options from the kernel environment.
 *
 * Bits may be set in the AcpiDbgLayer and AcpiDbgLevel debug registers
 * by specifying the names of the bits in the debug.acpi.layer and
 * debug.acpi.level environment variables.  Bits may be unset by 
 * prefixing the bit name with !.
 */
struct debugtag
{
    char        *name;
    UINT32      value;
};

static struct debugtag  dbg_layer[] = {
    {"ACPI_UTILITIES",          ACPI_UTILITIES},
    {"ACPI_HARDWARE",           ACPI_HARDWARE},
    {"ACPI_EVENTS",             ACPI_EVENTS},
    {"ACPI_TABLES",             ACPI_TABLES},
    {"ACPI_NAMESPACE",          ACPI_NAMESPACE},
    {"ACPI_PARSER",             ACPI_PARSER},
    {"ACPI_DISPATCHER",         ACPI_DISPATCHER},
    {"ACPI_EXECUTER",           ACPI_EXECUTER},
    {"ACPI_RESOURCES",          ACPI_RESOURCES},
    {"ACPI_CA_DEBUGGER",        ACPI_CA_DEBUGGER},
    {"ACPI_OS_SERVICES",        ACPI_OS_SERVICES},
    {"ACPI_CA_DISASSEMBLER",    ACPI_CA_DISASSEMBLER},
    {"ACPI_ALL_COMPONENTS",     ACPI_ALL_COMPONENTS},

    {"ACPI_AC_ADAPTER",         ACPI_AC_ADAPTER},
    {"ACPI_BATTERY",            ACPI_BATTERY},
    {"ACPI_BUS",                ACPI_BUS},
    {"ACPI_BUTTON",             ACPI_BUTTON},
    {"ACPI_EC",                 ACPI_EC},
    {"ACPI_FAN",                ACPI_FAN},
    {"ACPI_POWERRES",           ACPI_POWERRES},
    {"ACPI_PROCESSOR",          ACPI_PROCESSOR},
    {"ACPI_THERMAL",            ACPI_THERMAL},
    {"ACPI_TIMER",              ACPI_TIMER},
    {"ACPI_ALL_DRIVERS",        ACPI_ALL_DRIVERS},
    {NULL, 0}
};

static struct debugtag dbg_level[] = {
    {"ACPI_LV_ERROR",           ACPI_LV_ERROR},
    {"ACPI_LV_WARN",            ACPI_LV_WARN},
    {"ACPI_LV_INIT",            ACPI_LV_INIT},
    {"ACPI_LV_DEBUG_OBJECT",    ACPI_LV_DEBUG_OBJECT},
    {"ACPI_LV_INFO",            ACPI_LV_INFO},
    {"ACPI_LV_ALL_EXCEPTIONS",  ACPI_LV_ALL_EXCEPTIONS},

    /* Trace verbosity level 1 [Standard Trace Level] */
    {"ACPI_LV_INIT_NAMES",      ACPI_LV_INIT_NAMES},
    {"ACPI_LV_PARSE",           ACPI_LV_PARSE},
    {"ACPI_LV_LOAD",            ACPI_LV_LOAD},
    {"ACPI_LV_DISPATCH",        ACPI_LV_DISPATCH},
    {"ACPI_LV_EXEC",            ACPI_LV_EXEC},
    {"ACPI_LV_NAMES",           ACPI_LV_NAMES},
    {"ACPI_LV_OPREGION",        ACPI_LV_OPREGION},
    {"ACPI_LV_BFIELD",          ACPI_LV_BFIELD},
    {"ACPI_LV_TABLES",          ACPI_LV_TABLES},
    {"ACPI_LV_VALUES",          ACPI_LV_VALUES},
    {"ACPI_LV_OBJECTS",         ACPI_LV_OBJECTS},
    {"ACPI_LV_RESOURCES",       ACPI_LV_RESOURCES},
    {"ACPI_LV_USER_REQUESTS",   ACPI_LV_USER_REQUESTS},
    {"ACPI_LV_PACKAGE",         ACPI_LV_PACKAGE},
    {"ACPI_LV_VERBOSITY1",      ACPI_LV_VERBOSITY1},

    /* Trace verbosity level 2 [Function tracing and memory allocation] */
    {"ACPI_LV_ALLOCATIONS",     ACPI_LV_ALLOCATIONS},
    {"ACPI_LV_FUNCTIONS",       ACPI_LV_FUNCTIONS},
    {"ACPI_LV_OPTIMIZATIONS",   ACPI_LV_OPTIMIZATIONS},
    {"ACPI_LV_VERBOSITY2",      ACPI_LV_VERBOSITY2},
    {"ACPI_LV_ALL",             ACPI_LV_ALL},

    /* Trace verbosity level 3 [Threading, I/O, and Interrupts] */
    {"ACPI_LV_MUTEX",           ACPI_LV_MUTEX},
    {"ACPI_LV_THREADS",         ACPI_LV_THREADS},
    {"ACPI_LV_IO",              ACPI_LV_IO},
    {"ACPI_LV_INTERRUPTS",      ACPI_LV_INTERRUPTS},
    {"ACPI_LV_VERBOSITY3",      ACPI_LV_VERBOSITY3},

    /* Exceptionally verbose output -- also used in the global "DebugLevel"  */
    {"ACPI_LV_AML_DISASSEMBLE", ACPI_LV_AML_DISASSEMBLE},
    {"ACPI_LV_VERBOSE_INFO",    ACPI_LV_VERBOSE_INFO},
    {"ACPI_LV_FULL_TABLES",     ACPI_LV_FULL_TABLES},
    {"ACPI_LV_EVENTS",          ACPI_LV_EVENTS},
    {"ACPI_LV_VERBOSE",         ACPI_LV_VERBOSE},
    {NULL, 0}
};    

static void
acpi_parse_debug(char *cp, struct debugtag *tag, UINT32 *flag)
{
    char        *ep;
    int         i, l;
    int         set;

    while (*cp) {
        if (isspace(*cp)) {
            cp++;
            continue;
        }
        ep = cp;
        while (*ep && !isspace(*ep))
            ep++;
        if (*cp == '!') {
            set = 0;
            cp++;
            if (cp == ep)
                continue;
        } else {
            set = 1;
        }
        l = ep - cp;
        for (i = 0; tag[i].name != NULL; i++) {
            if (!strncmp(cp, tag[i].name, l)) {
                if (set)
                    *flag |= tag[i].value;
                else
                    *flag &= ~tag[i].value;
            }
        }
        cp = ep;
    }
}

static void
acpi_set_debugging(void *junk)
{
    char        *layer, *level;

    if (cold) {
        AcpiDbgLayer = 0;
        AcpiDbgLevel = 0;
    }

    layer = kgetenv("debug.acpi.layer");
    level = kgetenv("debug.acpi.level");
    if (layer == NULL && level == NULL)
        return;

    kprintf("ACPI set debug");
    if (layer != NULL) {
        if (strcmp("NONE", layer) != 0)
            kprintf(" layer '%s'", layer);
        acpi_parse_debug(layer, &dbg_layer[0], &AcpiDbgLayer);
        freeenv(layer);
    }
    if (level != NULL) {
        if (strcmp("NONE", level) != 0)
            kprintf(" level '%s'", level);
        acpi_parse_debug(level, &dbg_level[0], &AcpiDbgLevel);
        freeenv(level);
    }
    kprintf("\n");
}
SYSINIT(acpi_debugging, SI_SUB_TUNABLES, SI_ORDER_ANY, acpi_set_debugging,
        NULL);

static int
acpi_debug_sysctl(SYSCTL_HANDLER_ARGS)
{
    int          error, *dbg;
    struct       debugtag *tag;
    struct       sbuf sb;

    if (sbuf_new(&sb, NULL, 128, SBUF_AUTOEXTEND) == NULL)
        return (ENOMEM);
    if (strcmp(oidp->oid_arg1, "debug.acpi.layer") == 0) {
        tag = &dbg_layer[0];
        dbg = &AcpiDbgLayer;
    } else {
        tag = &dbg_level[0];
        dbg = &AcpiDbgLevel;
    }

    /* Get old values if this is a get request. */
    if (*dbg == 0) {
        sbuf_cpy(&sb, "NONE");
    } else if (req->newptr == NULL) {
        for (; tag->name != NULL; tag++) {
            if ((*dbg & tag->value) == tag->value)
                sbuf_printf(&sb, "%s ", tag->name);
        }
    }
    sbuf_trim(&sb);
    sbuf_finish(&sb);

    /* Copy out the old values to the user. */
    error = SYSCTL_OUT(req, sbuf_data(&sb), sbuf_len(&sb));
    sbuf_delete(&sb);

    /* If the user is setting a string, parse it. */
    if (error == 0 && req->newptr != NULL) {
        *dbg = 0;
        /* XXX setenv((char *)oidp->oid_arg1, (char *)req->newptr); */
        acpi_set_debugging(NULL);
    }

    return (error);
}
SYSCTL_PROC(_debug_acpi, OID_AUTO, layer, CTLFLAG_RW | CTLTYPE_STRING,
            "debug.acpi.layer", 0, acpi_debug_sysctl, "A", "");
SYSCTL_PROC(_debug_acpi, OID_AUTO, level, CTLFLAG_RW | CTLTYPE_STRING,
            "debug.acpi.level", 0, acpi_debug_sysctl, "A", "");
#endif

static int
acpi_pm_func(u_long cmd, void *arg, ...)
{
        int     state, acpi_state;
        int     error;
        struct  acpi_softc *sc;
        va_list ap;

        error = 0;
        switch (cmd) {
        case POWER_CMD_SUSPEND:
                sc = (struct acpi_softc *)arg;
                if (sc == NULL) {
                        error = EINVAL;
                        goto out;
                }

                va_start(ap, arg);
                state = va_arg(ap, int);
                va_end(ap);     

                switch (state) {
                case POWER_SLEEP_STATE_STANDBY:
                        acpi_state = sc->acpi_standby_sx;
                        break;
                case POWER_SLEEP_STATE_SUSPEND:
                        acpi_state = sc->acpi_suspend_sx;
                        break;
                case POWER_SLEEP_STATE_HIBERNATE:
                        acpi_state = ACPI_STATE_S4;
                        break;
                default:
                        error = EINVAL;
                        goto out;
                }

                acpi_SetSleepState(sc, acpi_state);
                break;
        default:
                error = EINVAL;
                goto out;
        }

out:
        return (error);
}

static void
acpi_pm_register(void *arg)
{
    if (!cold || resource_disabled("acpi", 0))
        return;

    power_pm_register(POWER_PM_TYPE_ACPI, acpi_pm_func, NULL);
}

SYSINIT(power, SI_SUB_KLD, SI_ORDER_ANY, acpi_pm_register, 0);