/*      $OpenBSD: power.c,v 1.9 2022/04/06 18:59:26 naddy Exp $ */

/*
 * Copyright (c) 2007 Martin Reindl.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/proc.h>
#include <sys/signalvar.h>

#include <machine/bus.h>
#include <machine/autoconf.h>

#include <sh/include/devreg.h>

#include <landisk/landisk/landiskreg.h>
#include <landisk/dev/obiovar.h>

struct power_softc {
        struct device           sc_dev;
        void                    *sc_ih;
};

int     power_match(struct device *, void *, void *);
void    power_attach(struct device *, struct device *, void *);
int     power_intr(void *aux);

const struct cfattach power_ca = {
        sizeof(struct power_softc),
        power_match,
        power_attach
};

struct cfdriver power_cd = {
        NULL, "power", DV_DULL
};

struct power_softc *power_softc;

int
power_match(struct device *parent, void *match, void *aux)
{
        struct obio_attach_args *oa = aux;
        static struct obio_irq power_match_irq;

        oa->oa_nio = 0;
        oa->oa_niomem = 0;
        if (oa->oa_nirq == 0)
                oa->oa_irq = &power_match_irq;
        oa->oa_nirq = 1;
        oa->oa_irq[0].or_irq = LANDISK_INTR_PWRSW;

        return (1);
}

void
power_attach(struct device *parent, struct device *self, void *aux)
{
        struct power_softc *sc = (void *)self;

        power_softc = sc;

        sc->sc_ih = extintr_establish(LANDISK_INTR_PWRSW, IPL_TTY,
            power_intr, sc, sc->sc_dev.dv_xname);
        if (sc->sc_ih == NULL) {
                printf(": couldn't map interrupt\n");
                return;
        }

        printf("\n");
}

int
power_intr(void *arg)
{
        extern int allowpowerdown;
        int status;

        status = (int8_t)_reg_read_1(LANDISK_BTNSTAT);
        if (status == -1) {
                return (0);
        }

        status = ~status;
        if (status & BTN_POWER_BIT) {
#ifdef DEBUG
                printf("%s switched\n", sc->sc_dev.dv_xname);
                db_enter();
#endif
                _reg_write_1(LANDISK_PWRSW_INTCLR, 1);
                if (allowpowerdown == 1) {
                        allowpowerdown = 0;
                        prsignal(initprocess, SIGUSR1);
                }
                return (1);
        }
        return (0);
}