mts64.c

Go to the documentation of this file.

/*     
 *   ALSA Driver for Ego Systems Inc. (ESI) Miditerminal 4140
 *   Copyright (c) 2006 by Matthias König <[email protected]>
 *
 *   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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

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

MODULE_AUTHOR("Matthias Koenig <[email protected]>");
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 pardev_claimed;

    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 __devinit 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 __devinit 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 __devinit 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 __devinitdata = {
    .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 __devinitdata = {
    .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 __devinitdata = {
    .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 __devinitdata = {
    .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 __devinitdata = {
    .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 char *texts[5] = { "24",
                  "25",
                  "29.97",
                  "30D",
                  "30"    };

    uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
    uinfo->count = 1;
    uinfo->value.enumerated.items = 5;
    if (uinfo->value.enumerated.item > 4)
        uinfo->value.enumerated.item = 4;
    strcpy(uinfo->value.enumerated.name,
           texts[uinfo->value.enumerated.item]);
    
    return 0;
}

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 __devinitdata = {
    .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 __devinit snd_mts64_ctl_create(struct snd_card *card, 
                      struct mts64 *mts) 
{
    int err, i;
    static struct snd_kcontrol_new *control[] __devinitdata = {
        &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 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 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 __devinit 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 int __devinit snd_mts64_probe_port(struct parport *p)
{
    struct pardevice *pardev;
    int res;

    pardev = parport_register_device(p, DRIVER_NAME,
                     NULL, NULL, NULL,
                     0, NULL);
    if (!pardev)
        return -EIO;
    
    if (parport_claim(pardev)) {
        parport_unregister_device(pardev);
        return -EIO;
    }

    res = mts64_probe(p);

    parport_release(pardev);
    parport_unregister_device(pardev);

    return res;
}

static void __devinit 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 struct parport_driver mts64_parport_driver = {
    .name   = "mts64",
    .attach = snd_mts64_attach,
    .detach = snd_mts64_detach
};

/*********************************************************************
 * 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) {
        if (mts->pardev_claimed)
            parport_release(pardev);
        parport_unregister_device(pardev);
    }

    snd_mts64_free(mts);
}

static int __devinit 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;

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

    if (dev >= SNDRV_CARDS)
        return -ENODEV;
    if (!enable[dev]) 
        return -ENOENT;
    if ((err = snd_mts64_probe_port(p)) < 0)
        return err;

    err = snd_card_create(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);

    pardev = parport_register_device(p,                   /* port */
                     DRIVER_NAME,         /* name */
                     NULL,                /* preempt */
                     NULL,                /* wakeup */
                     snd_mts64_interrupt, /* ISR */
                     PARPORT_DEV_EXCL,    /* flags */
                     (void *)card);       /* private */
    if (pardev == NULL) {
        snd_printd("Cannot register pardevice\n");
        err = -EIO;
        goto __err;
    }

    if ((err = snd_mts64_create(card, pardev, &mts)) < 0) {
        snd_printd("Cannot create main component\n");
        parport_unregister_device(pardev);
        goto __err;
    }
    card->private_data = mts;
    card->private_free = snd_mts64_card_private_free;
    
    if ((err = snd_mts64_rawmidi_create(card)) < 0) {
        snd_printd("Creating Rawmidi component failed\n");
        goto __err;
    }

    /* claim parport */
    if (parport_claim(pardev)) {
        snd_printd("Cannot claim parport 0x%lx\n", pardev->port->base);
        err = -EIO;
        goto __err;
    }
    mts->pardev_claimed = 1;

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

    platform_set_drvdata(pdev, card);

    snd_card_set_dev(card, &pdev->dev);

    /* 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;

__err:
    snd_card_free(card);
    return err;
}

static int __devexit 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 = __devexit_p(snd_mts64_remove),
    .driver = {
        .name = PLATFORM_DRIVER,
        .owner  = THIS_MODULE,
    }
};

/*********************************************************************
 * 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);