/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>,
 *                   Hannu Savolainen 1993-1996,
 *                   Rob Hooft
 *                   
 *  Routines for control of AdLib FM cards (OPL2/OPL3/OPL4 chips)
 *
 *  Most if code is ported from OSS/Lite.
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <sound/opl3.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/minors.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Hannu Savolainen 1993-1996, Rob Hooft");
MODULE_DESCRIPTION("Routines for control of AdLib FM cards (OPL2/OPL3/OPL4 chips)");
MODULE_LICENSE("GPL");

extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];

static void snd_opl2_command(struct snd_opl3 * opl3, unsigned short cmd, unsigned char val)
{
        unsigned long flags;
        unsigned long port;

        /*
         * The original 2-OP synth requires a quite long delay
         * after writing to a register.
         */

        port = (cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port;

        spin_lock_irqsave(&opl3->reg_lock, flags);

        outb((unsigned char) cmd, port);
        udelay(10);

        outb((unsigned char) val, port + 1);
        udelay(30);

        spin_unlock_irqrestore(&opl3->reg_lock, flags);
}

static void snd_opl3_command(struct snd_opl3 * opl3, unsigned short cmd, unsigned char val)
{
        unsigned long flags;
        unsigned long port;

        /*
         * The OPL-3 survives with just two INBs
         * after writing to a register.
         */

        port = (cmd & OPL3_RIGHT) ? opl3->r_port : opl3->l_port;

        spin_lock_irqsave(&opl3->reg_lock, flags);

        outb((unsigned char) cmd, port);
        inb(opl3->l_port);
        inb(opl3->l_port);

        outb((unsigned char) val, port + 1);
        inb(opl3->l_port);
        inb(opl3->l_port);

        spin_unlock_irqrestore(&opl3->reg_lock, flags);
}

static int snd_opl3_detect(struct snd_opl3 * opl3)
{
        /*
         * This function returns 1 if the FM chip is present at the given I/O port
         * The detection algorithm plays with the timer built in the FM chip and
         * looks for a change in the status register.
         *
         * Note! The timers of the FM chip are not connected to AdLib (and compatible)
         * boards.
         *
         * Note2! The chip is initialized if detected.
         */

        unsigned char stat1, stat2, signature;

        /* Reset timers 1 and 2 */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_TIMER1_MASK | OPL3_TIMER2_MASK);
        /* Reset the IRQ of the FM chip */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_IRQ_RESET);
        signature = stat1 = inb(opl3->l_port);  /* Status register */
        if ((stat1 & 0xe0) != 0x00) {   /* Should be 0x00 */
                snd_printd("OPL3: stat1 = 0x%x\n", stat1);
                return -ENODEV;
        }
        /* Set timer1 to 0xff */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER1, 0xff);
        /* Unmask and start timer 1 */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_TIMER2_MASK | OPL3_TIMER1_START);
        /* Now we have to delay at least 80us */
        udelay(200);
        /* Read status after timers have expired */
        stat2 = inb(opl3->l_port);
        /* Stop the timers */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_TIMER1_MASK | OPL3_TIMER2_MASK);
        /* Reset the IRQ of the FM chip */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, OPL3_IRQ_RESET);
        if ((stat2 & 0xe0) != 0xc0) {   /* There is no YM3812 */
                snd_printd("OPL3: stat2 = 0x%x\n", stat2);
                return -ENODEV;
        }

        /* If the toplevel code knows exactly the type of chip, don't try
           to detect it. */
        if (opl3->hardware != OPL3_HW_AUTO)
                return 0;

        /* There is a FM chip on this address. Detect the type (OPL2 to OPL4) */
        if (signature == 0x06) {        /* OPL2 */
                opl3->hardware = OPL3_HW_OPL2;
        } else {
                /*
                 * If we had an OPL4 chip, opl3->hardware would have been set
                 * by the OPL4 driver; so we can assume OPL3 here.
                 */
                if (snd_BUG_ON(!opl3->r_port))
                        return -ENODEV;
                opl3->hardware = OPL3_HW_OPL3;
        }
        return 0;
}

/*
 *  AdLib timers
 */

/*
 *  Timer 1 - 80us
 */

static int snd_opl3_timer1_start(struct snd_timer * timer)
{
        unsigned long flags;
        unsigned char tmp;
        unsigned int ticks;
        struct snd_opl3 *opl3;

        opl3 = snd_timer_chip(timer);
        spin_lock_irqsave(&opl3->timer_lock, flags);
        ticks = timer->sticks;
        tmp = (opl3->timer_enable | OPL3_TIMER1_START) & ~OPL3_TIMER1_MASK;
        opl3->timer_enable = tmp;
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER1, 256 - ticks);  /* timer 1 count */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);   /* enable timer 1 IRQ */
        spin_unlock_irqrestore(&opl3->timer_lock, flags);
        return 0;
}

static int snd_opl3_timer1_stop(struct snd_timer * timer)
{
        unsigned long flags;
        unsigned char tmp;
        struct snd_opl3 *opl3;

        opl3 = snd_timer_chip(timer);
        spin_lock_irqsave(&opl3->timer_lock, flags);
        tmp = (opl3->timer_enable | OPL3_TIMER1_MASK) & ~OPL3_TIMER1_START;
        opl3->timer_enable = tmp;
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);   /* disable timer #1 */
        spin_unlock_irqrestore(&opl3->timer_lock, flags);
        return 0;
}

/*
 *  Timer 2 - 320us
 */

static int snd_opl3_timer2_start(struct snd_timer * timer)
{
        unsigned long flags;
        unsigned char tmp;
        unsigned int ticks;
        struct snd_opl3 *opl3;

        opl3 = snd_timer_chip(timer);
        spin_lock_irqsave(&opl3->timer_lock, flags);
        ticks = timer->sticks;
        tmp = (opl3->timer_enable | OPL3_TIMER2_START) & ~OPL3_TIMER2_MASK;
        opl3->timer_enable = tmp;
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER2, 256 - ticks);  /* timer 1 count */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);   /* enable timer 1 IRQ */
        spin_unlock_irqrestore(&opl3->timer_lock, flags);
        return 0;
}

static int snd_opl3_timer2_stop(struct snd_timer * timer)
{
        unsigned long flags;
        unsigned char tmp;
        struct snd_opl3 *opl3;

        opl3 = snd_timer_chip(timer);
        spin_lock_irqsave(&opl3->timer_lock, flags);
        tmp = (opl3->timer_enable | OPL3_TIMER2_MASK) & ~OPL3_TIMER2_START;
        opl3->timer_enable = tmp;
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TIMER_CONTROL, tmp);   /* disable timer #1 */
        spin_unlock_irqrestore(&opl3->timer_lock, flags);
        return 0;
}

/*

 */

static struct snd_timer_hardware snd_opl3_timer1 =
{
        .flags =        SNDRV_TIMER_HW_STOP,
        .resolution =   80000,
        .ticks =        256,
        .start =        snd_opl3_timer1_start,
        .stop =         snd_opl3_timer1_stop,
};

static struct snd_timer_hardware snd_opl3_timer2 =
{
        .flags =        SNDRV_TIMER_HW_STOP,
        .resolution =   320000,
        .ticks =        256,
        .start =        snd_opl3_timer2_start,
        .stop =         snd_opl3_timer2_stop,
};

static int snd_opl3_timer1_init(struct snd_opl3 * opl3, int timer_no)
{
        struct snd_timer *timer = NULL;
        struct snd_timer_id tid;
        int err;

        tid.dev_class = SNDRV_TIMER_CLASS_CARD;
        tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
        tid.card = opl3->card->number;
        tid.device = timer_no;
        tid.subdevice = 0;
        if ((err = snd_timer_new(opl3->card, "AdLib timer #1", &tid, &timer)) >= 0) {
                strcpy(timer->name, "AdLib timer #1");
                timer->private_data = opl3;
                timer->hw = snd_opl3_timer1;
        }
        opl3->timer1 = timer;
        return err;
}

static int snd_opl3_timer2_init(struct snd_opl3 * opl3, int timer_no)
{
        struct snd_timer *timer = NULL;
        struct snd_timer_id tid;
        int err;

        tid.dev_class = SNDRV_TIMER_CLASS_CARD;
        tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
        tid.card = opl3->card->number;
        tid.device = timer_no;
        tid.subdevice = 0;
        if ((err = snd_timer_new(opl3->card, "AdLib timer #2", &tid, &timer)) >= 0) {
                strcpy(timer->name, "AdLib timer #2");
                timer->private_data = opl3;
                timer->hw = snd_opl3_timer2;
        }
        opl3->timer2 = timer;
        return err;
}

/*

 */

void snd_opl3_interrupt(struct snd_hwdep * hw)
{
        unsigned char status;
        struct snd_opl3 *opl3;
        struct snd_timer *timer;

        if (hw == NULL)
                return;

        opl3 = hw->private_data;
        status = inb(opl3->l_port);
#if 0
        snd_printk(KERN_DEBUG "AdLib IRQ status = 0x%x\n", status);
#endif
        if (!(status & 0x80))
                return;

        if (status & 0x40) {
                timer = opl3->timer1;
                snd_timer_interrupt(timer, timer->sticks);
        }
        if (status & 0x20) {
                timer = opl3->timer2;
                snd_timer_interrupt(timer, timer->sticks);
        }
}

EXPORT_SYMBOL(snd_opl3_interrupt);

/*

 */

static int snd_opl3_free(struct snd_opl3 *opl3)
{
        if (snd_BUG_ON(!opl3))
                return -ENXIO;
        if (opl3->private_free)
                opl3->private_free(opl3);
        snd_opl3_clear_patches(opl3);
        release_and_free_resource(opl3->res_l_port);
        release_and_free_resource(opl3->res_r_port);
        kfree(opl3);
        return 0;
}

static int snd_opl3_dev_free(struct snd_device *device)
{
        struct snd_opl3 *opl3 = device->device_data;
        return snd_opl3_free(opl3);
}

int snd_opl3_new(struct snd_card *card,
                 unsigned short hardware,
                 struct snd_opl3 **ropl3)
{
        static struct snd_device_ops ops = {
                .dev_free = snd_opl3_dev_free,
        };
        struct snd_opl3 *opl3;
        int err;

        *ropl3 = NULL;
        opl3 = kzalloc(sizeof(*opl3), GFP_KERNEL);
        if (!opl3)
                return -ENOMEM;

        opl3->card = card;
        opl3->hardware = hardware;
        spin_lock_init(&opl3->reg_lock);
        spin_lock_init(&opl3->timer_lock);

        if ((err = snd_device_new(card, SNDRV_DEV_CODEC, opl3, &ops)) < 0) {
                snd_opl3_free(opl3);
                return err;
        }

        *ropl3 = opl3;
        return 0;
}

EXPORT_SYMBOL(snd_opl3_new);

int snd_opl3_init(struct snd_opl3 *opl3)
{
        if (! opl3->command) {
                printk(KERN_ERR "snd_opl3_init: command not defined!\n");
                return -EINVAL;
        }

        opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
        /* Melodic mode */
        opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);

        switch (opl3->hardware & OPL3_HW_MASK) {
        case OPL3_HW_OPL2:
                opl3->max_voices = MAX_OPL2_VOICES;
                break;
        case OPL3_HW_OPL3:
        case OPL3_HW_OPL4:
                opl3->max_voices = MAX_OPL3_VOICES;
                /* Enter OPL3 mode */
                opl3->command(opl3, OPL3_RIGHT | OPL3_REG_MODE, OPL3_OPL3_ENABLE);
        }
        return 0;
}

EXPORT_SYMBOL(snd_opl3_init);

int snd_opl3_create(struct snd_card *card,
                    unsigned long l_port,
                    unsigned long r_port,
                    unsigned short hardware,
                    int integrated,
                    struct snd_opl3 ** ropl3)
{
        struct snd_opl3 *opl3;
        int err;

        *ropl3 = NULL;
        if ((err = snd_opl3_new(card, hardware, &opl3)) < 0)
                return err;
        if (! integrated) {
                if ((opl3->res_l_port = request_region(l_port, 2, "OPL2/3 (left)")) == NULL) {
                        snd_printk(KERN_ERR "opl3: can't grab left port 0x%lx\n", l_port);
                        snd_device_free(card, opl3);
                        return -EBUSY;
                }
                if (r_port != 0 &&
                    (opl3->res_r_port = request_region(r_port, 2, "OPL2/3 (right)")) == NULL) {
                        snd_printk(KERN_ERR "opl3: can't grab right port 0x%lx\n", r_port);
                        snd_device_free(card, opl3);
                        return -EBUSY;
                }
        }
        opl3->l_port = l_port;
        opl3->r_port = r_port;

        switch (opl3->hardware) {
        /* some hardware doesn't support timers */
        case OPL3_HW_OPL3_SV:
        case OPL3_HW_OPL3_CS:
        case OPL3_HW_OPL3_FM801:
                opl3->command = &snd_opl3_command;
                break;
        default:
                opl3->command = &snd_opl2_command;
                if ((err = snd_opl3_detect(opl3)) < 0) {
                        snd_printd("OPL2/3 chip not detected at 0x%lx/0x%lx\n",
                                   opl3->l_port, opl3->r_port);
                        snd_device_free(card, opl3);
                        return err;
                }
                /* detect routine returns correct hardware type */
                switch (opl3->hardware & OPL3_HW_MASK) {
                case OPL3_HW_OPL3:
                case OPL3_HW_OPL4:
                        opl3->command = &snd_opl3_command;
                }
        }

        snd_opl3_init(opl3);

        *ropl3 = opl3;
        return 0;
}

EXPORT_SYMBOL(snd_opl3_create);

int snd_opl3_timer_new(struct snd_opl3 * opl3, int timer1_dev, int timer2_dev)
{
        int err;

        if (timer1_dev >= 0)
                if ((err = snd_opl3_timer1_init(opl3, timer1_dev)) < 0)
                        return err;
        if (timer2_dev >= 0) {
                if ((err = snd_opl3_timer2_init(opl3, timer2_dev)) < 0) {
                        snd_device_free(opl3->card, opl3->timer1);
                        opl3->timer1 = NULL;
                        return err;
                }
        }
        return 0;
}

EXPORT_SYMBOL(snd_opl3_timer_new);

int snd_opl3_hwdep_new(struct snd_opl3 * opl3,
                       int device, int seq_device,
                       struct snd_hwdep ** rhwdep)
{
        struct snd_hwdep *hw;
        struct snd_card *card = opl3->card;
        int err;

        if (rhwdep)
                *rhwdep = NULL;

        /* create hardware dependent device (direct FM) */

        if ((err = snd_hwdep_new(card, "OPL2/OPL3", device, &hw)) < 0) {
                snd_device_free(card, opl3);
                return err;
        }
        hw->private_data = opl3;
        hw->exclusive = 1;
#ifdef CONFIG_SND_OSSEMUL
        if (device == 0)
                hw->oss_type = SNDRV_OSS_DEVICE_TYPE_DMFM;
#endif
        strcpy(hw->name, hw->id);
        switch (opl3->hardware & OPL3_HW_MASK) {
        case OPL3_HW_OPL2:
                strcpy(hw->name, "OPL2 FM");
                hw->iface = SNDRV_HWDEP_IFACE_OPL2;
                break;
        case OPL3_HW_OPL3:
                strcpy(hw->name, "OPL3 FM");
                hw->iface = SNDRV_HWDEP_IFACE_OPL3;
                break;
        case OPL3_HW_OPL4:
                strcpy(hw->name, "OPL4 FM");
                hw->iface = SNDRV_HWDEP_IFACE_OPL4;
                break;
        }

        /* operators - only ioctl */
        hw->ops.open = snd_opl3_open;
        hw->ops.ioctl = snd_opl3_ioctl;
        hw->ops.write = snd_opl3_write;
        hw->ops.release = snd_opl3_release;

        opl3->hwdep = hw;
        opl3->seq_dev_num = seq_device;
#if IS_ENABLED(CONFIG_SND_SEQUENCER)
        if (snd_seq_device_new(card, seq_device, SNDRV_SEQ_DEV_ID_OPL3,
                               sizeof(struct snd_opl3 *), &opl3->seq_dev) >= 0) {
                strcpy(opl3->seq_dev->name, hw->name);
                *(struct snd_opl3 **)SNDRV_SEQ_DEVICE_ARGPTR(opl3->seq_dev) = opl3;
        }
#endif
        if (rhwdep)
                *rhwdep = hw;
        return 0;
}

EXPORT_SYMBOL(snd_opl3_hwdep_new);

/*
 *  INIT part
 */

static int __init alsa_opl3_init(void)
{
        return 0;
}

static void __exit alsa_opl3_exit(void)
{
}

module_init(alsa_opl3_init)
module_exit(alsa_opl3_exit)