/*      $OpenBSD: apm.c,v 1.45 2026/04/06 19:34:08 mlarkin Exp $        */

/*-
 * Copyright (c) 2001 Alexander Guy.  All rights reserved.
 * Copyright (c) 1998-2001 Michael Shalayeff. All rights reserved.
 * Copyright (c) 1995 John T. Kohl.  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.
 * 3. Neither the names of the authors nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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 MIND, 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.
 *
 */

#include "apm.h"
#include "wsdisplay.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/clockintr.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/buf.h>
#include <sys/event.h>
#include <sys/reboot.h>

#include <machine/autoconf.h>
#include <machine/conf.h>
#include <machine/cpu.h>
#include <machine/apmvar.h>

#include <dev/pci/pcivar.h>    /* pci_dopm */

#include <dev/wscons/wsdisplayvar.h>

#include <loongson/dev/kb3310var.h>

#if defined(APMDEBUG)
#define DPRINTF(x)      printf x
#else
#define DPRINTF(x)      /**/
#endif

struct apm_softc {
        struct device sc_dev;
        struct klist sc_note;
        int    sc_flags;
};

int apmmatch(struct device *, void *, void *);
void apmattach(struct device *, struct device *, void *);

const struct cfattach apm_ca = {
        sizeof(struct apm_softc), apmmatch, apmattach
};

struct cfdriver apm_cd = {
        NULL, "apm", DV_DULL
};

#define APMUNIT(dev)    (minor(dev)&0xf0)
#define APMDEV(dev)     (minor(dev)&0x0f)
#define APMDEV_NORMAL   0
#define APMDEV_CTL      8

void filt_apmrdetach(struct knote *kn);
int filt_apmread(struct knote *kn, long hint);
int apmkqfilter(dev_t dev, struct knote *kn);
int apm_getdefaultinfo(struct apm_power_info *);

int apm_suspend(int state);

const struct filterops apmread_filtops = {
        .f_flags        = FILTEROP_ISFD,
        .f_attach       = NULL,
        .f_detach       = filt_apmrdetach,
        .f_event        = filt_apmread,
};

int (*get_apminfo)(struct apm_power_info *) = apm_getdefaultinfo;

/*
 * Flags to control kernel display
 *      SCFLAG_NOPRINT:         do not output APM power messages due to
 *                              a power change event.
 *
 *      SCFLAG_PCTPRINT:        do not output APM power messages due to
 *                              to a power change event unless the battery
 *                              percentage changes.
 */

#define SCFLAG_NOPRINT  0x0008000
#define SCFLAG_PCTPRINT 0x0004000
#define SCFLAG_PRINT    (SCFLAG_NOPRINT|SCFLAG_PCTPRINT)

#define SCFLAG_OREAD    (1 << 0)
#define SCFLAG_OWRITE   (1 << 1)
#define SCFLAG_OPEN     (SCFLAG_OREAD|SCFLAG_OWRITE)


int
apmmatch(struct device *parent, void *match, void *aux)
{
        struct mainbus_attach_args *maa = aux;

        /*
         * It only makes sense to attach on a 2F system, since 2E do not
         * feature speed throttling, and we do not support 2E-based
         * notebooks yet (assuming there are any).
         */
        if (strcmp(maa->maa_name, apm_cd.cd_name) == 0 && loongson_ver == 0x2f)
                return (1);
        return (0);
}

void
apmattach(struct device *parent, struct device *self, void *aux)
{
        /* Enable PCI Power Management. */
        pci_dopm = 1;

        printf("\n");
}

int
apmopen(dev_t dev, int flag, int mode, struct proc *p)
{
        struct apm_softc *sc;
        int error = 0;

        /* apm0 only */
        if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
            !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
                return ENXIO;

        DPRINTF(("apmopen: dev %d pid %d flag %x mode %x\n",
            APMDEV(dev), p->p_p->ps_pid, flag, mode));

        switch (APMDEV(dev)) {
        case APMDEV_CTL:
                if (!(flag & FWRITE)) {
                        error = EINVAL;
                        break;
                }
                if (sc->sc_flags & SCFLAG_OWRITE) {
                        error = EBUSY;
                        break;
                }
                sc->sc_flags |= SCFLAG_OWRITE;
                break;
        case APMDEV_NORMAL:
                if (!(flag & FREAD) || (flag & FWRITE)) {
                        error = EINVAL;
                        break;
                }
                sc->sc_flags |= SCFLAG_OREAD;
                break;
        default:
                error = ENXIO;
                break;
        }
        return error;
}

int
apmclose(dev_t dev, int flag, int mode, struct proc *p)
{
        struct apm_softc *sc;

        /* apm0 only */
        if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
            !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
                return ENXIO;

        DPRINTF(("apmclose: pid %d flag %x mode %x\n",
            p->p_p->ps_pid, flag, mode));

        switch (APMDEV(dev)) {
        case APMDEV_CTL:
                sc->sc_flags &= ~SCFLAG_OWRITE;
                break;
        case APMDEV_NORMAL:
                sc->sc_flags &= ~SCFLAG_OREAD;
                break;
        }
        return 0;
}

int
apmioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
{
        struct apm_softc *sc;
        struct apm_power_info *power;
        int error = 0;

        /* apm0 only */
        if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
            !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
                return ENXIO;

        switch (cmd) {
                /* some ioctl names from linux */
        case APM_IOC_STANDBY:
        case APM_IOC_STANDBY_REQ:
        case APM_IOC_SUSPEND:
        case APM_IOC_SUSPEND_REQ:
                if ((flag & FWRITE) == 0)
                        error = EBADF;
                else if (sys_platform->suspend == NULL ||
                    sys_platform->resume == NULL)
                        error = EOPNOTSUPP;
                else
                        error = apm_suspend(APM_IOC_SUSPEND);
                break;
        case APM_IOC_PRN_CTL:
                if ((flag & FWRITE) == 0)
                        error = EBADF;
                else {
                        int flag = *(int *)data;
                        DPRINTF(( "APM_IOC_PRN_CTL: %d\n", flag ));
                        switch (flag) {
                        case APM_PRINT_ON:      /* enable printing */
                                sc->sc_flags &= ~SCFLAG_PRINT;
                                break;
                        case APM_PRINT_OFF: /* disable printing */
                                sc->sc_flags &= ~SCFLAG_PRINT;
                                sc->sc_flags |= SCFLAG_NOPRINT;
                                break;
                        case APM_PRINT_PCT: /* disable some printing */
                                sc->sc_flags &= ~SCFLAG_PRINT;
                                sc->sc_flags |= SCFLAG_PCTPRINT;
                                break;
                        default:
                                error = EINVAL;
                                break;
                        }
                }
                break;
        case APM_IOC_DEV_CTL:
                if ((flag & FWRITE) == 0)
                        error = EBADF;
                else
                        error = EOPNOTSUPP; /* XXX */
                break;
        case APM_IOC_GETPOWER:
                power = (struct apm_power_info *)data;
                error = (*get_apminfo)(power);
                break;
        default:
                error = ENOTTY;
        }

        return error;
}

void
filt_apmrdetach(struct knote *kn)
{
        struct apm_softc *sc = (struct apm_softc *)kn->kn_hook;

        klist_remove_locked(&sc->sc_note, kn);
}

int
filt_apmread(struct knote *kn, long hint)
{
        /* XXX weird kqueue_scan() semantics */
        if (hint && !kn->kn_data)
                kn->kn_data = (int)hint;

        return (1);
}

int
apmkqfilter(dev_t dev, struct knote *kn)
{
        struct apm_softc *sc;

        /* apm0 only */
        if (!apm_cd.cd_ndevs || APMUNIT(dev) != 0 ||
            !(sc = apm_cd.cd_devs[APMUNIT(dev)]))
                return ENXIO;

        switch (kn->kn_filter) {
        case EVFILT_READ:
                kn->kn_fop = &apmread_filtops;
                break;
        default:
                return (EINVAL);
        }

        kn->kn_hook = (caddr_t)sc;
        klist_insert_locked(&sc->sc_note, kn);

        return (0);
}

int
apm_getdefaultinfo(struct apm_power_info *info)
{
        info->battery_state = APM_BATT_UNKNOWN;
        info->ac_state = APM_AC_UNKNOWN;
        info->battery_life = 0;
        info->minutes_left = -1;
        return (0);
}

void
apm_setinfohook(int (*hook)(struct apm_power_info *))
{
        get_apminfo = hook;
}

int
apm_record_event(u_int event, const char *src, const char *msg)
{
        static int apm_evindex;
        struct apm_softc *sc;

        /* apm0 only */
        if (apm_cd.cd_ndevs == 0 || (sc = apm_cd.cd_devs[0]) == NULL)
                return ENXIO;

        if ((sc->sc_flags & SCFLAG_NOPRINT) == 0)
                printf("%s: %s %s\n", sc->sc_dev.dv_xname, src, msg);

        /* skip if no user waiting */
        if ((sc->sc_flags & SCFLAG_OPEN) == 0)
                return (1);

        apm_evindex++;
        knote_locked(&sc->sc_note, APM_EVENT_COMPOSE(event, apm_evindex));

        return (0);
}

int
apm_suspend(int state)
{
        int rv;
        int s;

#if NWSDISPLAY > 0
        wsdisplay_suspend();
#endif

        stop_periodic_resettodr();
        resettodr();

        config_suspend_all(DVACT_QUIESCE);
        bufq_quiesce();

        s = splhigh();
        (void)disableintr();
        cold = 2;

        rv = config_suspend_all(DVACT_SUSPEND);

        suspend_randomness();

        /* XXX
         * Flag to disk drivers that they should "power down" the disk
         * when we get to DVACT_POWERDOWN.
         */
        boothowto |= RB_POWERDOWN;
        config_suspend_all(DVACT_POWERDOWN);
        boothowto &= ~RB_POWERDOWN;

        if (rv == 0) {
                rv = sys_platform->suspend();
                if (rv == 0)
                        rv = sys_platform->resume();
        }

        inittodr(gettime());    /* Move the clock forward */
        clockintr_cpu_init(NULL);
        clockintr_trigger();

        config_suspend_all(DVACT_RESUME);

        cold = 0;
        (void)enableintr();
        splx(s);

        resume_randomness(NULL, 0);     /* force RNG upper level reseed */
        bufq_restart();

        config_suspend_all(DVACT_WAKEUP);

        start_periodic_resettodr();

#if NWSDISPLAY > 0
        wsdisplay_resume();
#endif

        apm_record_event(APM_NORMAL_RESUME, "System", "resumed from sleep");

        return rv;
}