/*      $NetBSD: btn_obio.c,v 1.8 2023/12/20 15:00:08 thorpej Exp $     */

/*-
 * Copyright (C) 2005 NONAKA Kimihiro <nonaka@netbsd.org>
 * 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 ``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 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.
 */

#include "pwrsw_obio.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: btn_obio.c,v 1.8 2023/12/20 15:00:08 thorpej Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/ioctl.h>
#include <sys/callout.h>

#include <dev/sysmon/sysmonvar.h>
#include <dev/sysmon/sysmon_taskq.h>

#include <sh3/devreg.h>

#include <machine/button.h>

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

#define BTN_SELECT      0
#define BTN_COPY        1
#define BTN_REMOVE      2
#define NBUTTON         3

struct btn_obio_softc {
        device_t                sc_dev;
        void                    *sc_ih;

        struct callout          sc_guard_ch;
        struct sysmon_pswitch   sc_smpsw;       /* reset */
        struct btn_event        sc_bev[NBUTTON];

        int                     sc_mask;
};

#ifndef BTN_TIMEOUT
#define BTN_TIMEOUT     (hz / 10)       /* 100ms */
#endif

static int btn_obio_probe(device_t, cfdata_t, void *);
static void btn_obio_attach(device_t, device_t, void *);

static int btn_intr(void *aux);
static void btn_sysmon_pressed_event(void *arg);
static void btn_pressed_event(void *arg);
static void btn_guard_timeout(void *arg);

static struct btn_obio_softc *btn_softc;

static const struct {
        int idx;
        int mask;
        const char *name;
} btnlist[NBUTTON] = {
        { BTN_SELECT,   BTN_SELECT_BIT, "select" },
        { BTN_COPY,     BTN_COPY_BIT,   "copy"   },
        { BTN_REMOVE,   BTN_REMOVE_BIT, "remove" },
};

CFATTACH_DECL_NEW(btn_obio, sizeof(struct btn_obio_softc),
    btn_obio_probe, btn_obio_attach, NULL, NULL);

static int
btn_obio_probe(device_t parent, cfdata_t cfp, void *aux)
{
        struct obio_attach_args *oa = aux;

        if (btn_softc)
                return (0);

        oa->oa_nio = 0;
        oa->oa_niomem = 0;
        oa->oa_nirq = 1;
        oa->oa_irq[0].or_irq = LANDISK_INTR_BTN;

        return (1);
}

static void
btn_obio_attach(device_t parent, device_t self, void *aux)
{
        struct btn_obio_softc *sc;
        int i;

        aprint_naive("\n");
        aprint_normal(": USL-5P buttons\n");

        sc = device_private(self);
        sc->sc_dev = self;

        btn_softc = sc;

        callout_init(&sc->sc_guard_ch, 0);
        callout_setfunc(&sc->sc_guard_ch, btn_guard_timeout, sc);

        sc->sc_ih = extintr_establish(LANDISK_INTR_BTN, IPL_TTY, btn_intr, sc);
        if (sc->sc_ih == NULL) {
                aprint_error_dev(self, "unable to establish interrupt");
                panic("extintr_establish");
        }

        sc->sc_smpsw.smpsw_name = device_xname(self);
        sc->sc_smpsw.smpsw_type = PSWITCH_TYPE_RESET;
        if (sysmon_pswitch_register(&sc->sc_smpsw) != 0) {
                aprint_error_dev(self, "unable to register with sysmon\n");
                return;
        }
        sc->sc_mask |= BTN_RESET_BIT;

        btn_init();
        for (i = 0; i < NBUTTON; i++) {
                int idx = btnlist[i].idx;
                sc->sc_bev[idx].bev_name = btnlist[i].name;
                if (btn_event_register(&sc->sc_bev[idx]) != 0) {
                        aprint_error_dev(self,
                                         "unable to register '%s' button\n",
                                         btnlist[i].name);
                } else {
                        sc->sc_mask |= btnlist[i].mask;
                }
        }
}

static int
btn_intr(void *arg)
{
        struct btn_obio_softc *sc = (void *)arg;
        device_t self = sc->sc_dev;
        int status;
        int i;

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

        status = ~status;
        if (status & BTN_ALL_BIT) {
                if (status & BTN_RESET_BIT) {
                        if (sc->sc_mask & BTN_RESET_BIT) {
                                extintr_disable(sc->sc_ih);
#if NPWRSW_OBIO > 0
                                extintr_disable_by_num(LANDISK_INTR_PWRSW);
#endif
                                sysmon_task_queue_sched(0,
                                    btn_sysmon_pressed_event, sc);
                                return (1);
                        } else {
                                aprint_normal_dev(self,
                                        "reset button pressed\n");
                        }
                }

                for (i = 0; i < NBUTTON; i++) {
                        uint8_t mask = btnlist[i].mask;
                        int rv = 0;
                        if (status & mask) {
                                if (sc->sc_mask & mask) {
                                        sysmon_task_queue_sched(1,
                                            btn_pressed_event,
                                            &sc->sc_bev[btnlist[i].idx]);
                                } else {
                                        aprint_normal_dev(self,
                                                "%s button pressed\n",
                                                btnlist[i].name);
                                }
                                rv = 1;
                        }
                        if (rv != 0) {
                                extintr_disable(sc->sc_ih);
                                callout_schedule(&sc->sc_guard_ch, BTN_TIMEOUT);
                        }
                }
                return (1);
        }
        return (0);
}

static void
btn_sysmon_pressed_event(void *arg)
{
        struct btn_obio_softc *sc = (void *)arg;

        sysmon_pswitch_event(&sc->sc_smpsw, PSWITCH_EVENT_PRESSED);
}

static void
btn_pressed_event(void *arg)
{
        struct btn_event *bev = (void *)arg;

        btn_event_send(bev, BUTTON_EVENT_PRESSED);
}

static void
btn_guard_timeout(void *arg)
{
        struct btn_obio_softc *sc = arg;

        callout_stop(&sc->sc_guard_ch);
        extintr_enable(sc->sc_ih);
}