/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2003 Mathew Kanner
 * 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/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/kobj.h>

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

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

#include "mpu_if.h"
#include "mpufoi_if.h"

#define MPU_DATAPORT   0
#define MPU_CMDPORT    1
#define MPU_STATPORT   1
#define MPU_RESET      0xff
#define MPU_UART       0x3f
#define MPU_ACK        0xfe
#define MPU_STATMASK   0xc0
#define MPU_OUTPUTBUSY 0x40
#define MPU_INPUTBUSY  0x80
#define MPU_TRYDATA 50
#define MPU_DELAY   2500

#define CMD(m,d)        MPUFOI_WRITE(m, m->cookie, MPU_CMDPORT,d)
#define STATUS(m)       MPUFOI_READ(m, m->cookie, MPU_STATPORT)
#define READ(m)         MPUFOI_READ(m, m->cookie, MPU_DATAPORT)
#define WRITE(m,d)      MPUFOI_WRITE(m, m->cookie, MPU_DATAPORT,d)

struct mpu401 {
        KOBJ_FIELDS;
        struct snd_midi *mid;
        int     flags;
        driver_intr_t *si;
        void   *cookie;
        struct callout timer;
};

static void mpu401_timeout(void *m);
static mpu401_intr_t mpu401_intr;

static int mpu401_minit(struct snd_midi *, void *);
static int mpu401_muninit(struct snd_midi *, void *);
static int mpu401_minqsize(struct snd_midi *, void *);
static int mpu401_moutqsize(struct snd_midi *, void *);
static void mpu401_mcallback(struct snd_midi *, void *, int);

static kobj_method_t mpu401_methods[] = {
        KOBJMETHOD(mpu_init, mpu401_minit),
        KOBJMETHOD(mpu_uninit, mpu401_muninit),
        KOBJMETHOD(mpu_inqsize, mpu401_minqsize),
        KOBJMETHOD(mpu_outqsize, mpu401_moutqsize),
        KOBJMETHOD(mpu_callback, mpu401_mcallback),
        KOBJMETHOD_END
};

DEFINE_CLASS(mpu401, mpu401_methods, 0);

void
mpu401_timeout(void *a)
{
        struct mpu401 *m = (struct mpu401 *)a;

        if (m->si)
                (m->si)(m->cookie);

}
static int
mpu401_intr(struct mpu401 *m)
{
#define MPU_INTR_BUF    16
        uint8_t b[MPU_INTR_BUF];
        int i;
        int s;

#define RXRDY(m) ( (STATUS(m) & MPU_INPUTBUSY) == 0)
#define TXRDY(m) ( (STATUS(m) & MPU_OUTPUTBUSY) == 0)
        i = 0;
        s = STATUS(m);
        while ((s & MPU_INPUTBUSY) == 0 && i < MPU_INTR_BUF) {
                b[i] = READ(m);
                i++;
                s = STATUS(m);
        }
        if (i)
                midi_in(m->mid, b, i);
        i = 0;
        while (!(s & MPU_OUTPUTBUSY) && i < MPU_INTR_BUF) {
                if (midi_out(m->mid, b, 1)) {

                        WRITE(m, *b);
                } else {
                        return 0;
                }
                i++;
                /* DELAY(100); */
                s = STATUS(m);
        }

        if ((m->flags & M_TXEN) && (m->si)) {
                callout_reset(&m->timer, 1, mpu401_timeout, m);
        }
        return (m->flags & M_TXEN) == M_TXEN;
}

struct mpu401 *
mpu401_init(kobj_class_t cls, void *cookie, driver_intr_t softintr,
    mpu401_intr_t ** cb)
{
        struct mpu401 *m;

        *cb = NULL;
        m = malloc(sizeof(*m), M_MIDI, M_WAITOK | M_ZERO);

        kobj_init((kobj_t)m, cls);

        callout_init(&m->timer, 1);

        m->si = softintr;
        m->cookie = cookie;
        m->flags = 0;

        m->mid = midi_init(&mpu401_class, m);
        if (!m->mid)
                goto err;
        *cb = mpu401_intr;
        return m;
err:
        printf("mpu401_init error\n");
        free(m, M_MIDI);
        return NULL;
}

int
mpu401_uninit(struct mpu401 *m)
{
        int retval;

        CMD(m, MPU_RESET);
        retval = midi_uninit(m->mid);
        if (retval)
                return retval;
        free(m, M_MIDI);
        return 0;
}

static int
mpu401_minit(struct snd_midi *sm, void *arg)
{
        struct mpu401 *m = arg;
        int i;

        CMD(m, MPU_RESET);
        CMD(m, MPU_UART);
        return 0;
        i = 0;
        while (++i < 2000) {
                if (RXRDY(m))
                        if (READ(m) == MPU_ACK)
                                break;
        }

        if (i < 2000) {
                CMD(m, MPU_UART);
                return 0;
        }
        printf("mpu401_minit failed active sensing\n");
        return 1;
}

static int
mpu401_muninit(struct snd_midi *sm, void *arg)
{
        struct mpu401 *m = arg;

        return MPUFOI_UNINIT(m, m->cookie);
}

static int
mpu401_minqsize(struct snd_midi *sm, void *arg)
{
        return 128;
}

static int
mpu401_moutqsize(struct snd_midi *sm, void *arg)
{
        return 128;
}

static void
mpu401_mcallback(struct snd_midi *sm, void *arg, int flags)
{
        struct mpu401 *m = arg;

        if (flags & M_TXEN && m->si) {
                callout_reset(&m->timer, 1, mpu401_timeout, m);
        }
        m->flags = flags;
}