[ALSA] Add snd-portman2x4 driver for Midiman Portman 2x4 MIDI device

snd-portman2x4 driver supports Midiman Portman 2x4 parallel port
MIDI device.

Signed-off-by: Matthias Koenig <mkoenig@suse.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 876 insertions, 0 deletions

diff --git a/sound/drivers/portman2x4.c b/sound/drivers/portman2x4.c
new file mode 100644
index 000000000000..6c48772aaefd
--- /dev/null
+++ b/sound/drivers/portman2x4.c
@@ -0,0 +1,876 @@
+/*
+ *   Driver for Midiman Portman2x4 parallel port midi interface
+ *
+ *   Copyright (c) by Levent Guendogdu <levon@feature-it.com>
+ *
+ *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * ChangeLog
+ * Jan 24 2007 Matthias Koenig <mkoenig@suse.de>
+ *      - cleanup and rewrite
+ * Sep 30 2004 Tobias Gehrig <tobias@gehrig.tk>
+ *      - source code cleanup
+ * Sep 03 2004 Tobias Gehrig <tobias@gehrig.tk>
+ *      - fixed compilation problem with alsa 1.0.6a (removed MODULE_CLASSES,
+ *        MODULE_PARM_SYNTAX and changed MODULE_DEVICES to
+ *        MODULE_SUPPORTED_DEVICE)
+ * Mar 24 2004 Tobias Gehrig <tobias@gehrig.tk>
+ *      - added 2.6 kernel support
+ * Mar 18 2004 Tobias Gehrig <tobias@gehrig.tk>
+ *      - added parport_unregister_driver to the startup routine if the driver fails to detect a portman
+ *      - added support for all 4 output ports in portman_putmidi
+ * Mar 17 2004 Tobias Gehrig <tobias@gehrig.tk>
+ *      - added checks for opened input device in interrupt handler
+ * Feb 20 2004 Tobias Gehrig <tobias@gehrig.tk>
+ *      - ported from alsa 0.5 to 1.0
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/parport.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <sound/core.h>
+#include <sound/initval.h>
+#include <sound/rawmidi.h>
+#include <sound/control.h>
+
+#define CARD_NAME "Portman 2x4"
+#define DRIVER_NAME "portman"
+#define PLATFORM_DRIVER "snd_portman2x4"
+
+static int index[SNDRV_CARDS]  = SNDRV_DEFAULT_IDX;
+static char *id[SNDRV_CARDS]   = SNDRV_DEFAULT_STR;
+static int 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("Levent Guendogdu, Tobias Gehrig, Matthias Koenig");
+MODULE_DESCRIPTION("Midiman Portman2x4");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Midiman,Portman2x4}}");
+
+/*********************************************************************
+ * Chip specific
+ *********************************************************************/
+#define PORTMAN_NUM_INPUT_PORTS 2
+#define PORTMAN_NUM_OUTPUT_PORTS 4
+
+struct portman {
+        spinlock_t reg_lock;
+        struct snd_card *card;
+        struct snd_rawmidi *rmidi;
+        struct pardevice *pardev;
+        int pardev_claimed;
+
+        int open_count;
+        int mode[PORTMAN_NUM_INPUT_PORTS];
+        struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS];
+};
+
+static int portman_free(struct portman *pm)
+{
+        kfree(pm);
+        return 0;
+}
+
+static int __devinit portman_create(struct snd_card *card, 
+                                    struct pardevice *pardev, 
+                                    struct portman **rchip)
+{
+        struct portman *pm;
+
+        *rchip = NULL;
+
+        pm = kzalloc(sizeof(struct portman), GFP_KERNEL);
+        if (pm == NULL) 
+                return -ENOMEM;
+
+        /* Init chip specific data */
+        spin_lock_init(&pm->reg_lock);
+        pm->card = card;
+        pm->pardev = pardev;
+
+        *rchip = pm;
+
+        return 0;
+}
+
+/*********************************************************************
+ * HW related constants
+ *********************************************************************/
+
+/* Standard PC parallel port status register equates. */
+#define PP_STAT_BSY     0x80    /* Busy status.  Inverted. */
+#define PP_STAT_ACK     0x40    /* Acknowledge.  Non-Inverted. */
+#define PP_STAT_POUT    0x20    /* Paper Out.    Non-Inverted. */
+#define PP_STAT_SEL     0x10    /* Select.       Non-Inverted. */
+#define PP_STAT_ERR     0x08    /* Error.        Non-Inverted. */
+
+/* Standard PC parallel port command register equates. */
+#define PP_CMD_IEN      0x10    /* IRQ Enable.   Non-Inverted. */
+#define PP_CMD_SELI     0x08    /* Select Input. Inverted. */
+#define PP_CMD_INIT     0x04    /* Init Printer. Non-Inverted. */
+#define PP_CMD_FEED     0x02    /* Auto Feed.    Inverted. */
+#define PP_CMD_STB      0x01    /* Strobe.       Inverted. */
+
+/* Parallel Port Command Register as implemented by PCP2x4. */
+#define INT_EN          PP_CMD_IEN      /* Interrupt enable. */
+#define STROBE          PP_CMD_STB      /* Command strobe. */
+
+/* The parallel port command register field (b1..b3) selects the 
+ * various "registers" within the PC/P 2x4.  These are the internal
+ * address of these "registers" that must be written to the parallel
+ * port command register.
+ */
+#define RXDATA0         (0 << 1)        /* PCP RxData channel 0. */
+#define RXDATA1         (1 << 1)        /* PCP RxData channel 1. */
+#define GEN_CTL         (2 << 1)        /* PCP General Control Register. */
+#define SYNC_CTL        (3 << 1)        /* PCP Sync Control Register. */
+#define TXDATA0         (4 << 1)        /* PCP TxData channel 0. */
+#define TXDATA1         (5 << 1)        /* PCP TxData channel 1. */
+#define TXDATA2         (6 << 1)        /* PCP TxData channel 2. */
+#define TXDATA3         (7 << 1)        /* PCP TxData channel 3. */
+
+/* Parallel Port Status Register as implemented by PCP2x4. */
+#define ESTB            PP_STAT_POUT    /* Echoed strobe. */
+#define INT_REQ         PP_STAT_ACK     /* Input data int request. */
+#define BUSY            PP_STAT_ERR     /* Interface Busy. */
+
+/* Parallel Port Status Register BUSY and SELECT lines are multiplexed
+ * between several functions.  Depending on which 2x4 "register" is
+ * currently selected (b1..b3), the BUSY and SELECT lines are
+ * assigned as follows:
+ *
+ *   SELECT LINE:                                                    A3 A2 A1
+ *                                                                   --------
+ */
+#define RXAVAIL         PP_STAT_SEL     /* Rx Available, channel 0.   0 0 0 */
+//  RXAVAIL1    PP_STAT_SEL             /* Rx Available, channel 1.   0 0 1 */
+#define SYNC_STAT       PP_STAT_SEL     /* Reserved - Sync Status.    0 1 0 */
+//                                      /* Reserved.                  0 1 1 */
+#define TXEMPTY         PP_STAT_SEL     /* Tx Empty, channel 0.       1 0 0 */
+//      TXEMPTY1        PP_STAT_SEL     /* Tx Empty, channel 1.       1 0 1 */
+//  TXEMPTY2    PP_STAT_SEL             /* Tx Empty, channel 2.       1 1 0 */
+//  TXEMPTY3    PP_STAT_SEL             /* Tx Empty, channel 3.       1 1 1 */
+
+/*   BUSY LINE:                                                      A3 A2 A1
+ *                                                                   --------
+ */
+#define RXDATA          PP_STAT_BSY     /* Rx Input Data, channel 0.  0 0 0 */
+//      RXDATA1         PP_STAT_BSY     /* Rx Input Data, channel 1.  0 0 1 */
+#define SYNC_DATA       PP_STAT_BSY     /* Reserved - Sync Data.      0 1 0 */
+                                        /* Reserved.                  0 1 1 */
+#define DATA_ECHO       PP_STAT_BSY     /* Parallel Port Data Echo.   1 0 0 */
+#define A0_ECHO         PP_STAT_BSY     /* Address 0 Echo.            1 0 1 */
+#define A1_ECHO         PP_STAT_BSY     /* Address 1 Echo.            1 1 0 */
+#define A2_ECHO         PP_STAT_BSY     /* Address 2 Echo.            1 1 1 */
+
+#define PORTMAN2X4_MODE_INPUT_TRIGGERED  0x01
+
+/*********************************************************************
+ * Hardware specific functions
+ *********************************************************************/
+static inline void portman_write_command(struct portman *pm, u8 value)
+{
+        parport_write_control(pm->pardev->port, value);
+}
+
+static inline u8 portman_read_command(struct portman *pm)
+{
+        return parport_read_control(pm->pardev->port);
+}
+
+static inline u8 portman_read_status(struct portman *pm)
+{
+        return parport_read_status(pm->pardev->port);
+}
+
+static inline u8 portman_read_data(struct portman *pm)
+{
+        return parport_read_data(pm->pardev->port);
+}
+
+static inline void portman_write_data(struct portman *pm, u8 value)
+{
+        parport_write_data(pm->pardev->port, value);
+}
+
+static void portman_write_midi(struct portman *pm, 
+                               int port, u8 mididata)
+{
+        int command = ((port + 4) << 1);
+
+        /* Get entering data byte and port number in BL and BH respectively.
+         * Set up Tx Channel address field for use with PP Cmd Register.
+         * Store address field in BH register.
+         * Inputs:      AH = Output port number (0..3).
+         *              AL = Data byte.
+         *    command = TXDATA0 | INT_EN;
+         * Align port num with address field (b1...b3),
+         * set address for TXDatax, Strobe=0
+         */
+        command |= INT_EN;
+
+        /* Disable interrupts so that the process is not interrupted, then 
+         * write the address associated with the current Tx channel to the 
+         * PP Command Reg.  Do not set the Strobe signal yet.
+         */
+
+        do {
+                portman_write_command(pm, command);
+
+                /* While the address lines settle, write parallel output data to 
+                 * PP Data Reg.  This has no effect until Strobe signal is asserted.
+                 */
+
+                portman_write_data(pm, mididata);
+                
+                /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
+                 * Status Register), then go write data.  Else go back and wait.
+                 */
+        } while ((portman_read_status(pm) & TXEMPTY) != TXEMPTY);
+
+        /* TxEmpty is set.  Maintain PC/P destination address and assert
+         * Strobe through the PP Command Reg.  This will Strobe data into
+         * the PC/P transmitter and set the PC/P BUSY signal.
+         */
+
+        portman_write_command(pm, command | STROBE);
+
+        /* Wait for strobe line to settle and echo back through hardware.
+         * Once it has echoed back, assume that the address and data lines
+         * have settled!
+         */
+
+        while ((portman_read_status(pm) & ESTB) == 0)
+                cpu_relax();
+
+        /* Release strobe and immediately re-allow interrupts. */
+        portman_write_command(pm, command);
+
+        while ((portman_read_status(pm) & ESTB) == ESTB)
+                cpu_relax();
+
+        /* PC/P BUSY is now set.  We must wait until BUSY resets itself.
+         * We'll reenable ints while we're waiting.
+         */
+
+        while ((portman_read_status(pm) & BUSY) == BUSY)
+                cpu_relax();
+
+        /* Data sent. */
+}
+
+
+/*
+ *  Read MIDI byte from port
+ *  Attempt to read input byte from specified hardware input port (0..).
+ *  Return -1 if no data
+ */
+static int portman_read_midi(struct portman *pm, int port)
+{
+        unsigned char midi_data = 0;
+        unsigned char cmdout;   /* Saved address+IE bit. */
+
+        /* Make sure clocking edge is down before starting... */
+        portman_write_data(pm, 0);      /* Make sure edge is down. */
+
+        /* Set destination address to PCP. */
+        cmdout = (port << 1) | INT_EN;  /* Address + IE + No Strobe. */
+        portman_write_command(pm, cmdout);
+
+        while ((portman_read_status(pm) & ESTB) == ESTB)
+                cpu_relax();    /* Wait for strobe echo. */
+
+        /* After the address lines settle, check multiplexed RxAvail signal.
+         * If data is available, read it.
+         */
+        if ((portman_read_status(pm) & RXAVAIL) == 0)
+                return -1;      /* No data. */
+
+        /* Set the Strobe signal to enable the Rx clocking circuitry. */
+        portman_write_command(pm, cmdout | STROBE);     /* Write address+IE+Strobe. */
+
+        while ((portman_read_status(pm) & ESTB) == 0)
+                cpu_relax(); /* Wait for strobe echo. */
+
+        /* The first data bit (msb) is already sitting on the input line. */
+        midi_data = (portman_read_status(pm) & 128);
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 6. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 1) & 64;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 5. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 2) & 32;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 4. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 3) & 16;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 3. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 4) & 8;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 2. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 5) & 4;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 1. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 6) & 2;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+
+        /* Data bit 0. */
+        portman_write_data(pm, 0);      /* Cause falling edge while data settles. */
+        midi_data |= (portman_read_status(pm) >> 7) & 1;
+        portman_write_data(pm, 1);      /* Cause rising edge, which shifts data. */
+        portman_write_data(pm, 0);      /* Return data clock low. */
+
+
+        /* De-assert Strobe and return data. */
+        portman_write_command(pm, cmdout);      /* Output saved address+IE. */
+
+        /* Wait for strobe echo. */
+        while ((portman_read_status(pm) & ESTB) == ESTB)
+                cpu_relax();
+
+        return (midi_data & 255);       /* Shift back and return value. */
+}
+
+/*
+ *  Checks if any input data on the given channel is available
+ *  Checks RxAvail 
+ */
+static int portman_data_avail(struct portman *pm, int channel)
+{
+        int command = INT_EN;
+        switch (channel) {
+        case 0:
+                command |= RXDATA0;
+                break;
+        case 1:
+                command |= RXDATA1;
+                break;
+        }
+        /* Write hardware (assumme STROBE=0) */
+        portman_write_command(pm, command);
+        /* Check multiplexed RxAvail signal */
+        if ((portman_read_status(pm) & RXAVAIL) == RXAVAIL)
+                return 1;       /* Data available */
+
+        /* No Data available */
+        return 0;
+}
+
+
+/*
+ *  Flushes any input
+ */
+static void portman_flush_input(struct portman *pm, unsigned char port)
+{
+        /* Local variable for counting things */
+        unsigned int i = 0;
+        unsigned char command = 0;
+
+        switch (port) {
+        case 0:
+                command = RXDATA0;
+                break;
+        case 1:
+                command = RXDATA1;
+                break;
+        default:
+                snd_printk(KERN_WARNING
+                           "portman_flush_input() Won't flush port %i\n",
+                           port);
+                return;
+        }
+
+        /* Set address for specified channel in port and allow to settle. */
+        portman_write_command(pm, command);
+
+        /* Assert the Strobe and wait for echo back. */
+        portman_write_command(pm, command | STROBE);
+
+        /* Wait for ESTB */
+        while ((portman_read_status(pm) & ESTB) == 0)
+                cpu_relax();
+
+        /* Output clock cycles to the Rx circuitry. */
+        portman_write_data(pm, 0);
+
+        /* Flush 250 bits... */
+        for (i = 0; i < 250; i++) {
+                portman_write_data(pm, 1);
+                portman_write_data(pm, 0);
+        }
+
+        /* Deassert the Strobe signal of the port and wait for it to settle. */
+        portman_write_command(pm, command | INT_EN);
+
+        /* Wait for settling */
+        while ((portman_read_status(pm) & ESTB) == ESTB)
+                cpu_relax();
+}
+
+static int portman_probe(struct parport *p)
+{
+        /* Initialize the parallel port data register.  Will set Rx clocks
+         * low in case we happen to be addressing the Rx ports at this time.
+         */
+        /* 1 */
+        parport_write_data(p, 0);
+
+        /* Initialize the parallel port command register, thus initializing
+         * hardware handshake lines to midi box:
+         *
+         *                                  Strobe = 0
+         *                                  Interrupt Enable = 0            
+         */
+        /* 2 */
+        parport_write_control(p, 0);
+
+        /* Check if Portman PC/P 2x4 is out there. */
+        /* 3 */
+        parport_write_control(p, RXDATA0);      /* Write Strobe=0 to command reg. */
+
+        /* Check for ESTB to be clear */
+        /* 4 */
+        if ((parport_read_status(p) & ESTB) == ESTB)
+                return 1;       /* CODE 1 - Strobe Failure. */
+
+        /* Set for RXDATA0 where no damage will be done. */
+        /* 5 */
+        parport_write_control(p, RXDATA0 + STROBE);     /* Write Strobe=1 to command reg. */
+
+        /* 6 */
+        if ((parport_read_status(p) & ESTB) != ESTB)
+                return 1;       /* CODE 1 - Strobe Failure. */
+
+        /* 7 */
+        parport_write_control(p, 0);    /* Reset Strobe=0. */
+
+        /* Check if Tx circuitry is functioning properly.  If initialized 
+         * unit TxEmpty is false, send out char and see if if goes true.
+         */
+        /* 8 */
+        parport_write_control(p, TXDATA0);      /* Tx channel 0, strobe off. */
+
+        /* If PCP channel's TxEmpty is set (TxEmpty is read through the PP
+         * Status Register), then go write data.  Else go back and wait.
+         */
+        /* 9 */
+        if ((parport_read_status(p) & TXEMPTY) == 0)
+                return 2;
+
+        /* Return OK status. */
+        return 0;
+}
+
+static int portman_device_init(struct portman *pm)
+{
+        portman_flush_input(pm, 0);
+        portman_flush_input(pm, 1);
+
+        return 0;
+}
+
+/*********************************************************************
+ * Rawmidi
+ *********************************************************************/
+static int snd_portman_midi_open(struct snd_rawmidi_substream *substream)
+{
+        return 0;
+}
+
+static int snd_portman_midi_close(struct snd_rawmidi_substream *substream)
+{
+        return 0;
+}
+
+static void snd_portman_midi_input_trigger(struct snd_rawmidi_substream *substream,
+                                           int up)
+{
+        struct portman *pm = substream->rmidi->private_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&pm->reg_lock, flags);
+        if (up)
+                pm->mode[substream->number] |= PORTMAN2X4_MODE_INPUT_TRIGGERED;
+        else
+                pm->mode[substream->number] &= ~PORTMAN2X4_MODE_INPUT_TRIGGERED;
+        spin_unlock_irqrestore(&pm->reg_lock, flags);
+}
+
+static void snd_portman_midi_output_trigger(struct snd_rawmidi_substream *substream,
+                                            int up)
+{
+        struct portman *pm = substream->rmidi->private_data;
+        unsigned long flags;
+        unsigned char byte;
+
+        spin_lock_irqsave(&pm->reg_lock, flags);
+        if (up) {
+                while ((snd_rawmidi_transmit(substream, &byte, 1) == 1))
+                        portman_write_midi(pm, substream->number, byte);
+        }
+        spin_unlock_irqrestore(&pm->reg_lock, flags);
+}
+
+static struct snd_rawmidi_ops snd_portman_midi_output = {
+        .open =         snd_portman_midi_open,
+        .close =        snd_portman_midi_close,
+        .trigger =      snd_portman_midi_output_trigger,
+};
+
+static struct snd_rawmidi_ops snd_portman_midi_input = {
+        .open =         snd_portman_midi_open,
+        .close =        snd_portman_midi_close,
+        .trigger =      snd_portman_midi_input_trigger,
+};
+
+/* Create and initialize the rawmidi component */
+static int __devinit snd_portman_rawmidi_create(struct snd_card *card)
+{
+        struct portman *pm = card->private_data;
+        struct snd_rawmidi *rmidi;
+        struct snd_rawmidi_substream *substream;
+        int err;
+        
+        err = snd_rawmidi_new(card, CARD_NAME, 0, 
+                              PORTMAN_NUM_OUTPUT_PORTS, 
+                              PORTMAN_NUM_INPUT_PORTS, 
+                              &rmidi);
+        if (err < 0) 
+                return err;
+
+        rmidi->private_data = pm;
+        strcpy(rmidi->name, CARD_NAME);
+        rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
+                            SNDRV_RAWMIDI_INFO_INPUT |
+                            SNDRV_RAWMIDI_INFO_DUPLEX;
+
+        pm->rmidi = rmidi;
+
+        /* register rawmidi ops */
+        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 
+                            &snd_portman_midi_output);
+        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 
+                            &snd_portman_midi_input);
+
+        /* name substreams */
+        /* output */
+        list_for_each_entry(substream,
+                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
+                            list) {
+                sprintf(substream->name,
+                        "Portman2x4 %d", substream->number+1);
+        }
+        /* input */
+        list_for_each_entry(substream,
+                            &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
+                            list) {
+                pm->midi_input[substream->number] = substream;
+                sprintf(substream->name,
+                        "Portman2x4 %d", substream->number+1);
+        }
+
+        return err;
+}
+
+/*********************************************************************
+ * parport stuff
+ *********************************************************************/
+static void snd_portman_interrupt(int irq, void *userdata)
+{
+        unsigned char midivalue = 0;
+        struct portman *pm = ((struct snd_card*)userdata)->private_data;
+
+        spin_lock(&pm->reg_lock);
+
+        /* While any input data is waiting */
+        while ((portman_read_status(pm) & INT_REQ) == INT_REQ) {
+                /* If data available on channel 0, 
+                   read it and stuff it into the queue. */
+                if (portman_data_avail(pm, 0)) {
+                        /* Read Midi */
+                        midivalue = portman_read_midi(pm, 0);
+                        /* put midi into queue... */
+                        if (pm->mode[0] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
+                                snd_rawmidi_receive(pm->midi_input[0],
+                                                    &midivalue, 1);
+
+                }
+                /* If data available on channel 1, 
+                   read it and stuff it into the queue. */
+                if (portman_data_avail(pm, 1)) {
+                        /* Read Midi */
+                        midivalue = portman_read_midi(pm, 1);
+                        /* put midi into queue... */
+                        if (pm->mode[1] & PORTMAN2X4_MODE_INPUT_TRIGGERED)
+                                snd_rawmidi_receive(pm->midi_input[1],
+                                                    &midivalue, 1);
+                }
+
+        }
+
+        spin_unlock(&pm->reg_lock);
+}
+
+static int __devinit snd_portman_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 = portman_probe(p);
+
+        parport_release(pardev);
+        parport_unregister_device(pardev);
+
+        return res;
+}
+
+static void __devinit snd_portman_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_register(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_portman_detach(struct parport *p)
+{
+        /* nothing to do here */
+}
+
+static struct parport_driver portman_parport_driver = {
+        .name   = "portman2x4",
+        .attach = snd_portman_attach,
+        .detach = snd_portman_detach
+};
+
+/*********************************************************************
+ * platform stuff
+ *********************************************************************/
+static void snd_portman_card_private_free(struct snd_card *card)
+{
+        struct portman *pm = card->private_data;
+        struct pardevice *pardev = pm->pardev;
+
+        if (pardev) {
+                if (pm->pardev_claimed)
+                        parport_release(pardev);
+                parport_unregister_device(pardev);
+        }
+
+        portman_free(pm);
+}
+
+static int __devinit snd_portman_probe(struct platform_device *pdev)
+{
+        struct pardevice *pardev;
+        struct parport *p;
+        int dev = pdev->id;
+        struct snd_card *card = NULL;
+        struct portman *pm = 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_portman_probe_port(p)) < 0)
+                return err;
+
+        card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
+        if (card == NULL) {
+                snd_printd("Cannot create card\n");
+                return -ENOMEM;
+        }
+        strcpy(card->driver, DRIVER_NAME);
+        strcpy(card->shortname, 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_portman_interrupt, /* ISR */
+                                         PARPORT_DEV_EXCL,      /* flags */
+                                         (void *)card);         /* private */
+        if (pardev == NULL) {
+                snd_printd("Cannot register pardevice\n");
+                err = -EIO;
+                goto __err;
+        }
+
+        if ((err = portman_create(card, pardev, &pm)) < 0) {
+                snd_printd("Cannot create main component\n");
+                parport_unregister_device(pardev);
+                goto __err;
+        }
+        card->private_data = pm;
+        card->private_free = snd_portman_card_private_free;
+        
+        if ((err = snd_portman_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;
+        }
+        pm->pardev_claimed = 1;
+
+        /* init device */
+        if ((err = portman_device_init(pm)) < 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 "Portman 2x4 on 0x%lx\n", p->base);
+        return 0;
+
+__err:
+        snd_card_free(card);
+        return err;
+}
+
+static int snd_portman_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_portman_driver = {
+        .probe  = snd_portman_probe,
+        .remove = snd_portman_remove,
+        .driver = {
+                .name = PLATFORM_DRIVER
+        }
+};
+
+/*********************************************************************
+ * module init stuff
+ *********************************************************************/
+static void snd_portman_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_portman_driver);
+        parport_unregister_driver(&portman_parport_driver);
+}
+
+static int __init snd_portman_module_init(void)
+{
+        int err;
+
+        if ((err = platform_driver_register(&snd_portman_driver)) < 0)
+                return err;
+
+        if (parport_register_driver(&portman_parport_driver) != 0) {
+                platform_driver_unregister(&snd_portman_driver);
+                return -EIO;
+        }
+
+        if (device_count == 0) {
+                snd_portman_unregister_all();
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void __exit snd_portman_module_exit(void)
+{
+        snd_portman_unregister_all();
+}
+
+module_init(snd_portman_module_init);
+module_exit(snd_portman_module_exit);