// SPDX-License-Identifier: GPL-2.0-or-later
/*     
 *   ALSA Driver for Ego Systems Inc. (ESI) Miditerminal 4140
 *   Copyright (c) 2006 by Matthias König <mk@phasorlab.de>
 */

#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/parport.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include <sound/control.h>

#define CARD_NAME "Miditerminal 4140"
#define DRIVER_NAME "MTS64"
#define PLATFORM_DRIVER "snd_mts64"

static int index[SNDRV_CARDS]  = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS]   = SNDRV_DEFAULT_STR;
static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

static struct platform_device *platform_devices[SNDRV_CARDS]; 
static int device_count;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");

MODULE_AUTHOR("Matthias Koenig <mk@phasorlab.de>");
MODULE_DESCRIPTION("ESI Miditerminal 4140");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ESI,Miditerminal 4140}}");

/*********************************************************************
 * Chip specific
 *********************************************************************/
#define MTS64_NUM_INPUT_PORTS 5
#define MTS64_NUM_OUTPUT_PORTS 4
#define MTS64_SMPTE_SUBSTREAM 4

struct mts64 {
        spinlock_t lock;
        struct snd_card *card;
        struct snd_rawmidi *rmidi;
        struct pardevice *pardev;
        int open_count;
        int current_midi_output_port;
        int current_midi_input_port;
        u8 mode[MTS64_NUM_INPUT_PORTS];
        struct snd_rawmidi_substream *midi_input_substream[MTS64_NUM_INPUT_PORTS];
        int smpte_switch;
        u8 time[4]; /* [0]=hh, [1]=mm, [2]=ss, [3]=ff */
        u8 fps;
};

static int snd_mts64_free(struct mts64 *mts)
{
        kfree(mts);
        return 0;
}

static int snd_mts64_create(struct snd_card *card,
                            struct pardevice *pardev,
                            struct mts64 **rchip)
{
        struct mts64 *mts;

        *rchip = NULL;

        mts = kzalloc(sizeof(struct mts64), GFP_KERNEL);
        if (mts == NULL) 
                return -ENOMEM;

        /* Init chip specific data */
        spin_lock_init(&mts->lock);
        mts->card = card;
        mts->pardev = pardev;
        mts->current_midi_output_port = -1;
        mts->current_midi_input_port = -1;

        *rchip = mts;

        return 0;
}

/*********************************************************************
 * HW register related constants
 *********************************************************************/

/* Status Bits */
#define MTS64_STAT_BSY             0x80
#define MTS64_STAT_BIT_SET         0x20  /* readout process, bit is set */
#define MTS64_STAT_PORT            0x10  /* read byte is a port number */

/* Control Bits */
#define MTS64_CTL_READOUT          0x08  /* enable readout */
#define MTS64_CTL_WRITE_CMD        0x06  
#define MTS64_CTL_WRITE_DATA       0x02  
#define MTS64_CTL_STROBE           0x01  

/* Command */
#define MTS64_CMD_RESET            0xfe
#define MTS64_CMD_PROBE            0x8f  /* Used in probing procedure */
#define MTS64_CMD_SMPTE_SET_TIME   0xe8
#define MTS64_CMD_SMPTE_SET_FPS    0xee
#define MTS64_CMD_SMPTE_STOP       0xef
#define MTS64_CMD_SMPTE_FPS_24     0xe3
#define MTS64_CMD_SMPTE_FPS_25     0xe2
#define MTS64_CMD_SMPTE_FPS_2997   0xe4 
#define MTS64_CMD_SMPTE_FPS_30D    0xe1
#define MTS64_CMD_SMPTE_FPS_30     0xe0
#define MTS64_CMD_COM_OPEN         0xf8  /* setting the communication mode */
#define MTS64_CMD_COM_CLOSE1       0xff  /* clearing communication mode */
#define MTS64_CMD_COM_CLOSE2       0xf5

/*********************************************************************
 * Hardware specific functions
 *********************************************************************/
static void mts64_enable_readout(struct parport *p);
static void mts64_disable_readout(struct parport *p);
static int mts64_device_ready(struct parport *p);
static int mts64_device_init(struct parport *p);
static int mts64_device_open(struct mts64 *mts);
static int mts64_device_close(struct mts64 *mts);
static u8 mts64_map_midi_input(u8 c);
static int mts64_probe(struct parport *p);
static u16 mts64_read(struct parport *p);
static u8 mts64_read_char(struct parport *p);
static void mts64_smpte_start(struct parport *p,
                              u8 hours, u8 minutes,
                              u8 seconds, u8 frames,
                              u8 idx);
static void mts64_smpte_stop(struct parport *p);
static void mts64_write_command(struct parport *p, u8 c);
static void mts64_write_data(struct parport *p, u8 c);
static void mts64_write_midi(struct mts64 *mts, u8 c, int midiport);


/*  Enables the readout procedure
 *
 *  Before we can read a midi byte from the device, we have to set
 *  bit 3 of control port.
 */
static void mts64_enable_readout(struct parport *p)
{
        u8 c;

        c = parport_read_control(p);
        c |= MTS64_CTL_READOUT;
        parport_write_control(p, c); 
}

/*  Disables readout 
 *
 *  Readout is disabled by clearing bit 3 of control
 */
static void mts64_disable_readout(struct parport *p)
{
        u8 c;

        c = parport_read_control(p);
        c &= ~MTS64_CTL_READOUT;
        parport_write_control(p, c);
}

/*  waits for device ready
 *
 *  Checks if BUSY (Bit 7 of status) is clear
 *  1 device ready
 *  0 failure
 */
static int mts64_device_ready(struct parport *p)
{
        int i;
        u8 c;

        for (i = 0; i < 0xffff; ++i) {
                c = parport_read_status(p);
                c &= MTS64_STAT_BSY;
                if (c != 0) 
                        return 1;
        } 

        return 0;
}

/*  Init device (LED blinking startup magic)
 *
 *  Returns:
 *  0 init ok
 *  -EIO failure
 */
static int mts64_device_init(struct parport *p)
{
        int i;

        mts64_write_command(p, MTS64_CMD_RESET);

        for (i = 0; i < 64; ++i) {
                msleep(100);

                if (mts64_probe(p) == 0) {
                        /* success */
                        mts64_disable_readout(p);
                        return 0;
                }
        }
        mts64_disable_readout(p);

        return -EIO;
}

/* 
 *  Opens the device (set communication mode)
 */
static int mts64_device_open(struct mts64 *mts)
{
        int i;
        struct parport *p = mts->pardev->port;

        for (i = 0; i < 5; ++i)
                mts64_write_command(p, MTS64_CMD_COM_OPEN);

        return 0;
}

/*  
 *  Close device (clear communication mode)
 */
static int mts64_device_close(struct mts64 *mts)
{
        int i;
        struct parport *p = mts->pardev->port;

        for (i = 0; i < 5; ++i) {
                mts64_write_command(p, MTS64_CMD_COM_CLOSE1);
                mts64_write_command(p, MTS64_CMD_COM_CLOSE2);
        }

        return 0;
}

/*  map hardware port to substream number
 * 
 *  When reading a byte from the device, the device tells us
 *  on what port the byte is. This HW port has to be mapped to
 *  the midiport (substream number).
 *  substream 0-3 are Midiports 1-4
 *  substream 4 is SMPTE Timecode
 *  The mapping is done by the table:
 *  HW | 0 | 1 | 2 | 3 | 4 
 *  SW | 0 | 1 | 4 | 2 | 3
 */
static u8 mts64_map_midi_input(u8 c)
{
        static u8 map[] = { 0, 1, 4, 2, 3 };

        return map[c];
}


/*  Probe parport for device
 *
 *  Do we have a Miditerminal 4140 on parport? 
 *  Returns:
 *  0       device found
 *  -ENODEV no device
 */
static int mts64_probe(struct parport *p)
{
        u8 c;

        mts64_smpte_stop(p);
        mts64_write_command(p, MTS64_CMD_PROBE);

        msleep(50);
        
        c = mts64_read(p);

        c &= 0x00ff;
        if (c != MTS64_CMD_PROBE) 
                return -ENODEV;
        else 
                return 0;

}

/*  Read byte incl. status from device
 *
 *  Returns:
 *  data in lower 8 bits and status in upper 8 bits
 */
static u16 mts64_read(struct parport *p)
{
        u8 data, status;

        mts64_device_ready(p);
        mts64_enable_readout(p);
        status = parport_read_status(p);
        data = mts64_read_char(p);
        mts64_disable_readout(p);

        return (status << 8) | data;
}

/*  Read a byte from device
 *
 *  Note, that readout mode has to be enabled.
 *  readout procedure is as follows: 
 *  - Write number of the Bit to read to DATA
 *  - Read STATUS
 *  - Bit 5 of STATUS indicates if Bit is set
 *
 *  Returns:
 *  Byte read from device
 */
static u8 mts64_read_char(struct parport *p)
{
        u8 c = 0;
        u8 status;
        u8 i;

        for (i = 0; i < 8; ++i) {
                parport_write_data(p, i);
                c >>= 1;
                status = parport_read_status(p);
                if (status & MTS64_STAT_BIT_SET) 
                        c |= 0x80;
        }
        
        return c;
}

/*  Starts SMPTE Timecode generation
 *
 *  The device creates SMPTE Timecode by hardware.
 *  0 24 fps
 *  1 25 fps
 *  2 29.97 fps
 *  3 30 fps (Drop-frame)
 *  4 30 fps
 */
static void mts64_smpte_start(struct parport *p,
                              u8 hours, u8 minutes,
                              u8 seconds, u8 frames,
                              u8 idx)
{
        static u8 fps[5] = { MTS64_CMD_SMPTE_FPS_24, 
                             MTS64_CMD_SMPTE_FPS_25,
                             MTS64_CMD_SMPTE_FPS_2997, 
                             MTS64_CMD_SMPTE_FPS_30D,
                             MTS64_CMD_SMPTE_FPS_30    };

        mts64_write_command(p, MTS64_CMD_SMPTE_SET_TIME);
        mts64_write_command(p, frames);
        mts64_write_command(p, seconds);
        mts64_write_command(p, minutes);
        mts64_write_command(p, hours);

        mts64_write_command(p, MTS64_CMD_SMPTE_SET_FPS);
        mts64_write_command(p, fps[idx]);
}

/*  Stops SMPTE Timecode generation
 */
static void mts64_smpte_stop(struct parport *p)
{
        mts64_write_command(p, MTS64_CMD_SMPTE_STOP);
}

/*  Write a command byte to device
 */
static void mts64_write_command(struct parport *p, u8 c)
{
        mts64_device_ready(p);

        parport_write_data(p, c);

        parport_write_control(p, MTS64_CTL_WRITE_CMD);
        parport_write_control(p, MTS64_CTL_WRITE_CMD | MTS64_CTL_STROBE);
        parport_write_control(p, MTS64_CTL_WRITE_CMD);
}

/*  Write a data byte to device 
 */
static void mts64_write_data(struct parport *p, u8 c)
{
        mts64_device_ready(p);

        parport_write_data(p, c);

        parport_write_control(p, MTS64_CTL_WRITE_DATA);
        parport_write_control(p, MTS64_CTL_WRITE_DATA | MTS64_CTL_STROBE);
        parport_write_control(p, MTS64_CTL_WRITE_DATA);
}

/*  Write a MIDI byte to midiport
 *
 *  midiport ranges from 0-3 and maps to Ports 1-4
 *  assumptions: communication mode is on
 */
static void mts64_write_midi(struct mts64 *mts, u8 c,
                             int midiport)
{
        struct parport *p = mts->pardev->port;

        /* check current midiport */
        if (mts->current_midi_output_port != midiport)
                mts64_write_command(p, midiport);

        /* write midi byte */
        mts64_write_data(p, c);
}

/*********************************************************************
 * Control elements
 *********************************************************************/

/* SMPTE Switch */
#define snd_mts64_ctl_smpte_switch_info         snd_ctl_boolean_mono_info

static int snd_mts64_ctl_smpte_switch_get(struct snd_kcontrol* kctl,
                                          struct snd_ctl_elem_value *uctl)
{
        struct mts64 *mts = snd_kcontrol_chip(kctl);

        spin_lock_irq(&mts->lock);
        uctl->value.integer.value[0] = mts->smpte_switch;
        spin_unlock_irq(&mts->lock);

        return 0;
}

/* smpte_switch is not accessed from IRQ handler, so we just need
   to protect the HW access */
static int snd_mts64_ctl_smpte_switch_put(struct snd_kcontrol* kctl,
                                          struct snd_ctl_elem_value *uctl)
{
        struct mts64 *mts = snd_kcontrol_chip(kctl);
        int changed = 0;
        int val = !!uctl->value.integer.value[0];

        spin_lock_irq(&mts->lock);
        if (mts->smpte_switch == val)
                goto __out;

        changed = 1;
        mts->smpte_switch = val;
        if (mts->smpte_switch) {
                mts64_smpte_start(mts->pardev->port,
                                  mts->time[0], mts->time[1],
                                  mts->time[2], mts->time[3],
                                  mts->fps);
        } else {
                mts64_smpte_stop(mts->pardev->port);
        }
__out:
        spin_unlock_irq(&mts->lock);
        return changed;
}

static struct snd_kcontrol_new mts64_ctl_smpte_switch = {
        .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
        .name  = "SMPTE Playback Switch",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .private_value = 0,
        .info = snd_mts64_ctl_smpte_switch_info,
        .get  = snd_mts64_ctl_smpte_switch_get,
        .put  = snd_mts64_ctl_smpte_switch_put
};

/* Time */
static int snd_mts64_ctl_smpte_time_h_info(struct snd_kcontrol *kctl,
                                           struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 23;
        return 0;
}

static int snd_mts64_ctl_smpte_time_f_info(struct snd_kcontrol *kctl,
                                           struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 99;
        return 0;
}

static int snd_mts64_ctl_smpte_time_info(struct snd_kcontrol *kctl,
                                         struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 1;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 59;
        return 0;
}

static int snd_mts64_ctl_smpte_time_get(struct snd_kcontrol *kctl,
                                        struct snd_ctl_elem_value *uctl)
{
        struct mts64 *mts = snd_kcontrol_chip(kctl);
        int idx = kctl->private_value;

        spin_lock_irq(&mts->lock);
        uctl->value.integer.value[0] = mts->time[idx];
        spin_unlock_irq(&mts->lock);

        return 0;
}

static int snd_mts64_ctl_smpte_time_put(struct snd_kcontrol *kctl,
                                        struct snd_ctl_elem_value *uctl)
{
        struct mts64 *mts = snd_kcontrol_chip(kctl);
        int idx = kctl->private_value;
        unsigned int time = uctl->value.integer.value[0] % 60;
        int changed = 0;

        spin_lock_irq(&mts->lock);
        if (mts->time[idx] != time) {
                changed = 1;
                mts->time[idx] = time;
        }
        spin_unlock_irq(&mts->lock);

        return changed;
}

static struct snd_kcontrol_new mts64_ctl_smpte_time_hours = {
        .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
        .name  = "SMPTE Time Hours",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .private_value = 0,
        .info = snd_mts64_ctl_smpte_time_h_info,
        .get  = snd_mts64_ctl_smpte_time_get,
        .put  = snd_mts64_ctl_smpte_time_put
};

static struct snd_kcontrol_new mts64_ctl_smpte_time_minutes = {
        .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
        .name  = "SMPTE Time Minutes",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .private_value = 1,
        .info = snd_mts64_ctl_smpte_time_info,
        .get  = snd_mts64_ctl_smpte_time_get,
        .put  = snd_mts64_ctl_smpte_time_put
};

static struct snd_kcontrol_new mts64_ctl_smpte_time_seconds = {
        .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
        .name  = "SMPTE Time Seconds",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .private_value = 2,
        .info = snd_mts64_ctl_smpte_time_info,
        .get  = snd_mts64_ctl_smpte_time_get,
        .put  = snd_mts64_ctl_smpte_time_put
};

static struct snd_kcontrol_new mts64_ctl_smpte_time_frames = {
        .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
        .name  = "SMPTE Time Frames",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .private_value = 3,
        .info = snd_mts64_ctl_smpte_time_f_info,
        .get  = snd_mts64_ctl_smpte_time_get,
        .put  = snd_mts64_ctl_smpte_time_put
};

/* FPS */
static int snd_mts64_ctl_smpte_fps_info(struct snd_kcontrol *kctl,
                                        struct snd_ctl_elem_info *uinfo)
{
        static const char * const texts[5] = {
                "24", "25", "29.97", "30D", "30"
        };

        return snd_ctl_enum_info(uinfo, 1, 5, texts);
}

static int snd_mts64_ctl_smpte_fps_get(struct snd_kcontrol *kctl,
                                       struct snd_ctl_elem_value *uctl)
{
        struct mts64 *mts = snd_kcontrol_chip(kctl);

        spin_lock_irq(&mts->lock);
        uctl->value.enumerated.item[0] = mts->fps;
        spin_unlock_irq(&mts->lock);

        return 0;
}

static int snd_mts64_ctl_smpte_fps_put(struct snd_kcontrol *kctl,
                                       struct snd_ctl_elem_value *uctl)
{
        struct mts64 *mts = snd_kcontrol_chip(kctl);
        int changed = 0;

        if (uctl->value.enumerated.item[0] >= 5)
                return -EINVAL;
        spin_lock_irq(&mts->lock);
        if (mts->fps != uctl->value.enumerated.item[0]) {
                changed = 1;
                mts->fps = uctl->value.enumerated.item[0];
        }
        spin_unlock_irq(&mts->lock);

        return changed;
}

static struct snd_kcontrol_new mts64_ctl_smpte_fps = {
        .iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
        .name  = "SMPTE Fps",
        .index = 0,
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
        .private_value = 0,
        .info  = snd_mts64_ctl_smpte_fps_info,
        .get   = snd_mts64_ctl_smpte_fps_get,
        .put   = snd_mts64_ctl_smpte_fps_put
};


static int snd_mts64_ctl_create(struct snd_card *card,
                                struct mts64 *mts)
{
        int err, i;
        static struct snd_kcontrol_new *control[] = {
                &mts64_ctl_smpte_switch,
                &mts64_ctl_smpte_time_hours,
                &mts64_ctl_smpte_time_minutes,
                &mts64_ctl_smpte_time_seconds,
                &mts64_ctl_smpte_time_frames,
                &mts64_ctl_smpte_fps,
                NULL  };

        for (i = 0; control[i]; ++i) {
                err = snd_ctl_add(card, snd_ctl_new1(control[i], mts));
                if (err < 0) {
                        snd_printd("Cannot create control: %s\n", 
                                   control[i]->name);
                        return err;
                }
        }

        return 0;
}

/*********************************************************************
 * Rawmidi
 *********************************************************************/
#define MTS64_MODE_INPUT_TRIGGERED 0x01

static int snd_mts64_rawmidi_open(struct snd_rawmidi_substream *substream)
{
        struct mts64 *mts = substream->rmidi->private_data;

        if (mts->open_count == 0) {
                /* We don't need a spinlock here, because this is just called 
                   if the device has not been opened before. 
                   So there aren't any IRQs from the device */
                mts64_device_open(mts);

                msleep(50);
        }
        ++(mts->open_count);

        return 0;
}

static int snd_mts64_rawmidi_close(struct snd_rawmidi_substream *substream)
{
        struct mts64 *mts = substream->rmidi->private_data;
        unsigned long flags;

        --(mts->open_count);
        if (mts->open_count == 0) {
                /* We need the spinlock_irqsave here because we can still
                   have IRQs at this point */
                spin_lock_irqsave(&mts->lock, flags);
                mts64_device_close(mts);
                spin_unlock_irqrestore(&mts->lock, flags);

                msleep(500);

        } else if (mts->open_count < 0)
                mts->open_count = 0;

        return 0;
}

static void snd_mts64_rawmidi_output_trigger(struct snd_rawmidi_substream *substream,
                                             int up)
{
        struct mts64 *mts = substream->rmidi->private_data;
        u8 data;
        unsigned long flags;

        spin_lock_irqsave(&mts->lock, flags);
        while (snd_rawmidi_transmit_peek(substream, &data, 1) == 1) {
                mts64_write_midi(mts, data, substream->number+1);
                snd_rawmidi_transmit_ack(substream, 1);
        }
        spin_unlock_irqrestore(&mts->lock, flags);
}

static void snd_mts64_rawmidi_input_trigger(struct snd_rawmidi_substream *substream,
                                            int up)
{
        struct mts64 *mts = substream->rmidi->private_data;
        unsigned long flags;

        spin_lock_irqsave(&mts->lock, flags);
        if (up)
                mts->mode[substream->number] |= MTS64_MODE_INPUT_TRIGGERED;
        else
                mts->mode[substream->number] &= ~MTS64_MODE_INPUT_TRIGGERED;
        
        spin_unlock_irqrestore(&mts->lock, flags);
}

static const struct snd_rawmidi_ops snd_mts64_rawmidi_output_ops = {
        .open    = snd_mts64_rawmidi_open,
        .close   = snd_mts64_rawmidi_close,
        .trigger = snd_mts64_rawmidi_output_trigger
};

static const struct snd_rawmidi_ops snd_mts64_rawmidi_input_ops = {
        .open    = snd_mts64_rawmidi_open,
        .close   = snd_mts64_rawmidi_close,
        .trigger = snd_mts64_rawmidi_input_trigger
};

/* Create and initialize the rawmidi component */
static int snd_mts64_rawmidi_create(struct snd_card *card)
{
        struct mts64 *mts = card->private_data;
        struct snd_rawmidi *rmidi;
        struct snd_rawmidi_substream *substream;
        struct list_head *list;
        int err;
        
        err = snd_rawmidi_new(card, CARD_NAME, 0, 
                              MTS64_NUM_OUTPUT_PORTS, 
                              MTS64_NUM_INPUT_PORTS, 
                              &rmidi);
        if (err < 0) 
                return err;

        rmidi->private_data = mts;
        strcpy(rmidi->name, CARD_NAME);
        rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
                            SNDRV_RAWMIDI_INFO_INPUT |
                            SNDRV_RAWMIDI_INFO_DUPLEX;

        mts->rmidi = rmidi;

        /* register rawmidi ops */
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 
                            &snd_mts64_rawmidi_output_ops);
        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 
                            &snd_mts64_rawmidi_input_ops);

        /* name substreams */
        /* output */
        list_for_each(list, 
                      &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams) {
                substream = list_entry(list, struct snd_rawmidi_substream, list);
                sprintf(substream->name,
                        "Miditerminal %d", substream->number+1);
        }
        /* input */
        list_for_each(list, 
                      &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams) {
                substream = list_entry(list, struct snd_rawmidi_substream, list);
                mts->midi_input_substream[substream->number] = substream;
                switch(substream->number) {
                case MTS64_SMPTE_SUBSTREAM:
                        strcpy(substream->name, "Miditerminal SMPTE");
                        break;
                default:
                        sprintf(substream->name,
                                "Miditerminal %d", substream->number+1);
                }
        }

        /* controls */
        err = snd_mts64_ctl_create(card, mts);

        return err;
}

/*********************************************************************
 * parport stuff
 *********************************************************************/
static void snd_mts64_interrupt(void *private)
{
        struct mts64 *mts = ((struct snd_card*)private)->private_data;
        u16 ret;
        u8 status, data;
        struct snd_rawmidi_substream *substream;

        spin_lock(&mts->lock);
        ret = mts64_read(mts->pardev->port);
        data = ret & 0x00ff;
        status = ret >> 8;

        if (status & MTS64_STAT_PORT) {
                mts->current_midi_input_port = mts64_map_midi_input(data);
        } else {
                if (mts->current_midi_input_port == -1) 
                        goto __out;
                substream = mts->midi_input_substream[mts->current_midi_input_port];
                if (mts->mode[substream->number] & MTS64_MODE_INPUT_TRIGGERED)
                        snd_rawmidi_receive(substream, &data, 1);
        }
__out:
        spin_unlock(&mts->lock);
}

static void snd_mts64_attach(struct parport *p)
{
        struct platform_device *device;

        device = platform_device_alloc(PLATFORM_DRIVER, device_count);
        if (!device)
                return;

        /* Temporary assignment to forward the parport */
        platform_set_drvdata(device, p);

        if (platform_device_add(device) < 0) {
                platform_device_put(device);
                return;
        }

        /* Since we dont get the return value of probe
         * We need to check if device probing succeeded or not */
        if (!platform_get_drvdata(device)) {
                platform_device_unregister(device);
                return;
        }

        /* register device in global table */
        platform_devices[device_count] = device;
        device_count++;
}

static void snd_mts64_detach(struct parport *p)
{
        /* nothing to do here */
}

static int snd_mts64_dev_probe(struct pardevice *pardev)
{
        if (strcmp(pardev->name, DRIVER_NAME))
                return -ENODEV;

        return 0;
}

static struct parport_driver mts64_parport_driver = {
        .name           = "mts64",
        .probe          = snd_mts64_dev_probe,
        .match_port     = snd_mts64_attach,
        .detach         = snd_mts64_detach,
        .devmodel       = true,
};

/*********************************************************************
 * platform stuff
 *********************************************************************/
static void snd_mts64_card_private_free(struct snd_card *card)
{
        struct mts64 *mts = card->private_data;
        struct pardevice *pardev = mts->pardev;

        if (pardev) {
                parport_release(pardev);
                parport_unregister_device(pardev);
        }

        snd_mts64_free(mts);
}

static int snd_mts64_probe(struct platform_device *pdev)
{
        struct pardevice *pardev;
        struct parport *p;
        int dev = pdev->id;
        struct snd_card *card = NULL;
        struct mts64 *mts = NULL;
        int err;
        struct pardev_cb mts64_cb = {
                .preempt = NULL,
                .wakeup = NULL,
                .irq_func = snd_mts64_interrupt,        /* ISR */
                .flags = PARPORT_DEV_EXCL,              /* flags */
        };

        p = platform_get_drvdata(pdev);
        platform_set_drvdata(pdev, NULL);

        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (!enable[dev]) 
                return -ENOENT;

        err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE,
                           0, &card);
        if (err < 0) {
                snd_printd("Cannot create card\n");
                return err;
        }
        strcpy(card->driver, DRIVER_NAME);
        strcpy(card->shortname, "ESI " CARD_NAME);
        sprintf(card->longname,  "%s at 0x%lx, irq %i", 
                card->shortname, p->base, p->irq);

        mts64_cb.private = card;                         /* private */
        pardev = parport_register_dev_model(p,           /* port */
                                            DRIVER_NAME, /* name */
                                            &mts64_cb,   /* callbacks */
                                            pdev->id);   /* device number */
        if (!pardev) {
                snd_printd("Cannot register pardevice\n");
                err = -EIO;
                goto __err;
        }

        /* claim parport */
        if (parport_claim(pardev)) {
                snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
                err = -EIO;
                goto free_pardev;
        }

        if ((err = snd_mts64_create(card, pardev, &mts)) < 0) {
                snd_printd("Cannot create main component\n");
                goto release_pardev;
        }
        card->private_data = mts;
        card->private_free = snd_mts64_card_private_free;

        err = mts64_probe(p);
        if (err) {
                err = -EIO;
                goto __err;
        }
        
        if ((err = snd_mts64_rawmidi_create(card)) < 0) {
                snd_printd("Creating Rawmidi component failed\n");
                goto __err;
        }

        /* init device */
        if ((err = mts64_device_init(p)) < 0)
                goto __err;

        platform_set_drvdata(pdev, card);

        /* At this point card will be usable */
        if ((err = snd_card_register(card)) < 0) {
                snd_printd("Cannot register card\n");
                goto __err;
        }

        snd_printk(KERN_INFO "ESI Miditerminal 4140 on 0x%lx\n", p->base);
        return 0;

release_pardev:
        parport_release(pardev);
free_pardev:
        parport_unregister_device(pardev);
__err:
        snd_card_free(card);
        return err;
}

static int snd_mts64_remove(struct platform_device *pdev)
{
        struct snd_card *card = platform_get_drvdata(pdev);

        if (card)

                snd_card_free(card);

        return 0;
}

static struct platform_driver snd_mts64_driver = {
        .probe  = snd_mts64_probe,
        .remove = snd_mts64_remove,
        .driver = {
                .name = PLATFORM_DRIVER,
        }
};

/*********************************************************************
 * module init stuff
 *********************************************************************/
static void snd_mts64_unregister_all(void)
{
        int i;

        for (i = 0; i < SNDRV_CARDS; ++i) {
                if (platform_devices[i]) {
                        platform_device_unregister(platform_devices[i]);
                        platform_devices[i] = NULL;
                }
        }               
        platform_driver_unregister(&snd_mts64_driver);
        parport_unregister_driver(&mts64_parport_driver);
}

static int __init snd_mts64_module_init(void)
{
        int err;

        if ((err = platform_driver_register(&snd_mts64_driver)) < 0)
                return err;

        if (parport_register_driver(&mts64_parport_driver) != 0) {
                platform_driver_unregister(&snd_mts64_driver);
                return -EIO;
        }

        if (device_count == 0) {
                snd_mts64_unregister_all();
                return -ENODEV;
        }

        return 0;
}

static void __exit snd_mts64_module_exit(void)
{
        snd_mts64_unregister_all();
}

module_init(snd_mts64_module_init);
module_exit(snd_mts64_module_exit);