/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1999 Seigo Tanimura
 * Copyright (c) 2003 Mathew Kanner
 * Copyright (c) 2003-2006 Yuriy Tsibizov <yuriy.tsibizov@gfk.ru>
 * 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.
 */

#include <sys/param.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/systm.h>
#include <sys/sbuf.h>
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/mutex.h>

#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif

#include <dev/sound/pcm/sound.h>

#include <dev/sound/midi/midi.h>
#include <dev/sound/midi/mpu401.h>
#include "mpufoi_if.h"

#include <dev/sound/pci/emuxkireg.h>
#include <dev/sound/pci/emu10kx.h>

struct emu_midi_softc {
        struct mtx      mtx;
        device_t        dev;
        struct mpu401   *mpu;
        mpu401_intr_t   *mpu_intr;
        struct emu_sc_info *card;
        int             port;                   /* I/O port or I/O ptr reg */
        int             is_emu10k1;
        int             fflags;                 /* File flags */
        int             ihandle;                /* interrupt manager handle */
};

static uint32_t emu_midi_card_intr(void *p, uint32_t arg);

static unsigned char
emu_mread(struct mpu401 *arg __unused, void *cookie, int reg)
{
        struct emu_midi_softc *sc = cookie;
        unsigned int d;

        d = 0;
        if (sc->is_emu10k1)
                d = emu_rd(sc->card, 0x18 + reg, 1);
        else
                d = emu_rdptr(sc->card, 0, sc->port + reg);

        return (d);
}

static void
emu_mwrite(struct mpu401 *arg __unused, void *cookie, int reg, unsigned char b)
{
        struct emu_midi_softc *sc = cookie;

        if (sc->is_emu10k1)
                emu_wr(sc->card, 0x18 + reg, b, 1);
        else
                emu_wrptr(sc->card, 0, sc->port + reg, b);
}

static int
emu_muninit(struct mpu401 *arg __unused, void *cookie)
{
        struct emu_midi_softc *sc = cookie;

        mtx_lock(&sc->mtx);
        sc->mpu_intr = NULL;
        mtx_unlock(&sc->mtx);

        return (0);
}

static kobj_method_t emu_mpu_methods[] = {
        KOBJMETHOD(mpufoi_read, emu_mread),
        KOBJMETHOD(mpufoi_write, emu_mwrite),
        KOBJMETHOD(mpufoi_uninit, emu_muninit),
        KOBJMETHOD_END
};
static DEFINE_CLASS(emu_mpu, emu_mpu_methods, 0);

static uint32_t
emu_midi_card_intr(void *p, uint32_t intr_status)
{
        struct emu_midi_softc *sc = (struct emu_midi_softc *)p;
        if (sc->mpu_intr)
                (sc->mpu_intr) (sc->mpu);
        if (sc->mpu_intr == NULL) {
                /* We should read MIDI event to unlock card after
                 * interrupt. XXX - check, why this happens.  */
                if (bootverbose)
                        device_printf(sc->dev, "midi interrupt %08x without interrupt handler, force mread!\n", intr_status);
                (void)emu_mread((void *)(NULL), sc, 0);
        }
        return (intr_status); /* Acknowledge everything */
}

static void
emu_midi_intr(void *p)
{
        (void)emu_midi_card_intr(p, 0);
}

static int
emu_midi_probe(device_t dev)
{
        struct emu_midi_softc *scp;
        uintptr_t func, is_emu10k1;

        BUS_READ_IVAR(device_get_parent(dev), dev, 0, &func);
        if (func != SCF_MIDI)
                return (ENXIO);

        scp = device_get_softc(dev);
        bzero(scp, sizeof(*scp));
        BUS_READ_IVAR(device_get_parent(dev), dev, EMU_VAR_ISEMU10K1, &is_emu10k1);
        scp->is_emu10k1 = is_emu10k1 ? 1 : 0;

        device_set_desc(dev, "EMU10Kx MIDI Interface");
        return (0);
}

static int
emu_midi_attach(device_t dev)
{
        struct emu_midi_softc * scp;
        struct sndcard_func *func;
        struct emu_midiinfo *midiinfo;
        uint32_t inte_val, ipr_val;

        scp = device_get_softc(dev);
        func = device_get_ivars(dev);

        scp->dev = dev;
        midiinfo = (struct emu_midiinfo *)func->varinfo;
        scp->port = midiinfo->port;
        scp->card = midiinfo->card;

        mtx_init(&scp->mtx, device_get_nameunit(dev), "midi softc", MTX_DEF);

        if (scp->is_emu10k1) {
                /* SB Live! - only one MIDI device here */
                inte_val = 0;
                /* inte_val |= EMU_INTE_MIDITXENABLE;*/
                inte_val |= EMU_INTE_MIDIRXENABLE;
                ipr_val = EMU_IPR_MIDITRANSBUFE;
                ipr_val |= EMU_IPR_MIDIRECVBUFE;
        } else {
                if (scp->port == EMU_A_MUDATA1) {
                        /* EXTERNAL MIDI (AudigyDrive) */
                        inte_val = 0;
                        /* inte_val |= A_EMU_INTE_MIDITXENABLE1;*/
                        inte_val |= EMU_INTE_MIDIRXENABLE;
                        ipr_val = EMU_IPR_MIDITRANSBUFE;
                        ipr_val |= EMU_IPR_MIDIRECVBUFE;
                } else {
                        /* MIDI hw config port 2 */
                        inte_val = 0;
                        /* inte_val |= A_EMU_INTE_MIDITXENABLE2;*/
                        inte_val |= EMU_INTE_A_MIDIRXENABLE2;
                        ipr_val = EMU_IPR_A_MIDITRANSBUFE2;
                        ipr_val |= EMU_IPR_A_MIDIRECBUFE2;
                }
        }

        scp->ihandle = emu_intr_register(scp->card, inte_val, ipr_val, &emu_midi_card_intr, scp);
        /* Init the interface. */
        scp->mpu = mpu401_init(&emu_mpu_class, scp, emu_midi_intr, &scp->mpu_intr);
        if (scp->mpu == NULL) {
                emu_intr_unregister(scp->card, scp->ihandle);
                mtx_destroy(&scp->mtx);
                return (ENOMEM);
        }
        /*
         * XXX I don't know how to check for Live!Drive / AudigyDrive
         * presence. Let's hope that IR enabling code will not harm if
         * it is not present.
         */
        if (scp->is_emu10k1)
                emu_enable_ir(scp->card);
        else {
                if (scp->port == EMU_A_MUDATA1)
                        emu_enable_ir(scp->card);
        }

        return (0);
}

static int
emu_midi_detach(device_t dev)
{
        struct emu_midi_softc *scp;

        scp = device_get_softc(dev);
        mpu401_uninit(scp->mpu);
        emu_intr_unregister(scp->card, scp->ihandle);
        mtx_destroy(&scp->mtx);
        return (0);
}

static device_method_t emu_midi_methods[] = {
        DEVMETHOD(device_probe, emu_midi_probe),
        DEVMETHOD(device_attach, emu_midi_attach),
        DEVMETHOD(device_detach, emu_midi_detach),

        DEVMETHOD_END
};

static driver_t emu_midi_driver = {
        "midi",
        emu_midi_methods,
        sizeof(struct emu_midi_softc),
};
DRIVER_MODULE(snd_emu10kx_midi, emu10kx, emu_midi_driver, 0, 0);
MODULE_DEPEND(snd_emu10kx_midi, snd_emu10kx, SND_EMU10KX_MINVER, SND_EMU10KX_PREFVER, SND_EMU10KX_MAXVER);
MODULE_DEPEND(snd_emu10kx_midi, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
MODULE_VERSION(snd_emu10kx_midi, SND_EMU10KX_PREFVER);