[ALSA] snd-ca0106: Add midi support.

Modules: PCI drivers,CA0106 driver

Author: Tilman Kranz <tilde@tk-sls.de>

Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>

6 files changed, 512 insertions, 5 deletions

diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig
index d140e93d37b6..0fb16cf335ea 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -184,6 +184,7 @@ config SND_CA0106
         tristate "SB Audigy LS / Live 24bit"
         depends on SND
         select SND_AC97_CODEC
+        select SND_RAWMIDI
         help
           Say Y here to include support for the Sound Blaster Audigy LS
           and Live 24bit.
diff --git a/sound/pci/ca0106/Makefile b/sound/pci/ca0106/Makefile
index 89c6ceee21f3..dcbae7b31546 100644
--- a/sound/pci/ca0106/Makefile
+++ b/sound/pci/ca0106/Makefile
@@ -1,3 +1,3 @@
-snd-ca0106-objs := ca0106_main.o ca0106_proc.o ca0106_mixer.o
+snd-ca0106-objs := ca0106_main.o ca0106_proc.o ca0106_mixer.o ca_midi.o
 
 obj-$(CONFIG_SND_CA0106) += snd-ca0106.o
diff --git a/sound/pci/ca0106/ca0106.h b/sound/pci/ca0106/ca0106.h
index da09cab405a9..9a4b6406f7a5 100644
--- a/sound/pci/ca0106/ca0106.h
+++ b/sound/pci/ca0106/ca0106.h
@@ -399,10 +399,24 @@
 #define PLAYBACK_VOLUME2        0x6a            /* Playback Analog volume per channel. Does not effect AC3 output */
                                                 /* Similar to register 0x66, except that the destination is the I2S mixer instead of the SPDIF mixer. I.E. Outputs to the Analog outputs instead of SPDIF. */
 #define UNKNOWN6b               0x6b            /* Unknown. Readonly. Default 00400000 00400000 00400000 00400000 */
-#define UART_A_DATA             0x6c            /* Uart, used in setting sample rates, bits per sample etc. */
-#define UART_A_CMD              0x6d            /* Uart, used in setting sample rates, bits per sample etc. */
-#define UART_B_DATA             0x6e            /* Uart, Unknown. */
-#define UART_B_CMD              0x6f            /* Uart, Unknown. */
+#define MIDI_UART_A_DATA                0x6c            /* Midi Uart A Data */
+#define MIDI_UART_A_CMD         0x6d            /* Midi Uart A Command/Status */
+#define MIDI_UART_B_DATA                0x6e            /* Midi Uart B Data (currently unused) */
+#define MIDI_UART_B_CMD         0x6f            /* Midi Uart B Command/Status (currently unused) */
+
+/* unique channel identifier for midi->channel */
+
+#define CA0106_MIDI_CHAN_A              0x1
+#define CA0106_MIDI_CHAN_B              0x2
+
+/* from mpu401 */
+
+#define CA0106_MIDI_INPUT_AVAIL         0x80
+#define CA0106_MIDI_OUTPUT_READY        0x40
+#define CA0106_MPU401_RESET             0xff
+#define CA0106_MPU401_ENTER_UART        0x3f
+#define CA0106_MPU401_ACK               0xfe
+
 #define SAMPLE_RATE_TRACKER_STATUS 0x70         /* Readonly. Default 00108000 00108000 00500000 00500000 */
                                                 /* Estimated sample rate [19:0] Relative to 48kHz. 0x8000 =  1.0
                                                  * Rate Locked [20]
@@ -538,6 +552,8 @@
 #define CONTROL_CENTER_LFE_CHANNEL 1
 #define CONTROL_UNKNOWN_CHANNEL 2
 
+#include "ca_midi.h"
+
 typedef struct snd_ca0106_channel ca0106_channel_t;
 typedef struct snd_ca0106 ca0106_t;
 typedef struct snd_ca0106_pcm ca0106_pcm_t;
@@ -592,6 +608,9 @@ struct snd_ca0106 {
         int capture_mic_line_in;
 
         struct snd_dma_buffer buffer;
+
+        ca_midi_t midi;
+        ca_midi_t midi2;
 };
 
 int __devinit snd_ca0106_mixer(ca0106_t *emu);
diff --git a/sound/pci/ca0106/ca0106_main.c b/sound/pci/ca0106/ca0106_main.c
index f6920ef5b4ea..aaaef9e66af6 100644
--- a/sound/pci/ca0106/ca0106_main.c
+++ b/sound/pci/ca0106/ca0106_main.c
@@ -338,6 +338,18 @@ static void snd_ca0106_intr_enable(ca0106_t *emu, unsigned int intrenb)
         spin_unlock_irqrestore(&emu->emu_lock, flags);
 }
 
+static void snd_ca0106_intr_disable(ca0106_t *emu, unsigned int intrenb)
+{
+        unsigned long flags;
+        unsigned int enable;
+  
+        spin_lock_irqsave(&emu->emu_lock, flags);
+        enable = inl(emu->port + INTE) & ~intrenb;
+        outl(enable, emu->port + INTE);
+        spin_unlock_irqrestore(&emu->emu_lock, flags);
+}
+
+
 static void snd_ca0106_pcm_free_substream(snd_pcm_runtime_t *runtime)
 {
         kfree(runtime->private_data);
@@ -1040,6 +1052,15 @@ static irqreturn_t snd_ca0106_interrupt(int irq, void *dev_id,
 
         snd_ca0106_ptr_write(chip, EXTENDED_INT, 0, stat76);
         spin_lock(&chip->emu_lock);
+
+        if (chip->midi.dev_id &&
+          (status & (chip->midi.ipr_tx|chip->midi.ipr_rx))) {
+                if (chip->midi.interrupt)
+                        chip->midi.interrupt(&chip->midi, status);
+                else
+                        chip->midi.interrupt_disable(&chip->midi, chip->midi.tx_enable | chip->midi.rx_enable);
+        }
+
         // acknowledge the interrupt if necessary
         outl(status, chip->port+IPR);
 
@@ -1309,6 +1330,82 @@ static int __devinit snd_ca0106_create(snd_card_t *card,
         return 0;
 }
 
+
+void ca0106_midi_interrupt_enable(ca_midi_t *midi, int intr){
+        snd_ca0106_intr_enable((ca0106_t *)(midi->dev_id), intr);
+}
+
+void ca0106_midi_interrupt_disable(ca_midi_t *midi, int intr){
+        snd_ca0106_intr_disable((ca0106_t *)(midi->dev_id), intr);
+}
+
+unsigned char ca0106_midi_read(ca_midi_t *midi, int idx){
+        return (unsigned char)snd_ca0106_ptr_read((ca0106_t *)(midi->dev_id), midi->port + idx, 0);
+}
+
+void ca0106_midi_write(ca_midi_t *midi, int data, int idx){
+        snd_ca0106_ptr_write((ca0106_t *)(midi->dev_id), midi->port + idx, 0, data);
+}
+
+snd_card_t *ca0106_dev_id_card(void *dev_id){
+        return ((ca0106_t *)dev_id)->card;
+}
+
+int ca0106_dev_id_port(void *dev_id){
+        return ((ca0106_t *)dev_id)->port;
+}
+
+static int __devinit snd_ca0106_midi(ca0106_t *chip, unsigned int channel)
+{
+        ca_midi_t *midi;
+        char *name;
+        int err;
+
+        if(channel==CA0106_MIDI_CHAN_B) {
+                name = "CA0106 MPU-401 (UART) B";
+                midi =  &chip->midi2;
+                midi->tx_enable = INTE_MIDI_TX_B;
+                midi->rx_enable = INTE_MIDI_RX_B;
+                midi->ipr_tx = IPR_MIDI_TX_B;
+                midi->ipr_rx = IPR_MIDI_RX_B;
+                midi->port = MIDI_UART_B_DATA;
+        } else {
+                name = "CA0106 MPU-401 (UART)";
+                midi =  &chip->midi;
+                midi->tx_enable = INTE_MIDI_TX_A;
+                midi->rx_enable = INTE_MIDI_TX_B;
+                midi->ipr_tx = IPR_MIDI_TX_A;
+                midi->ipr_rx = IPR_MIDI_RX_A;
+                midi->port = MIDI_UART_A_DATA;
+        }
+
+        midi->reset = CA0106_MPU401_RESET;
+        midi->enter_uart = CA0106_MPU401_ENTER_UART;
+        midi->ack = CA0106_MPU401_ACK;
+
+        midi->input_avail = CA0106_MIDI_INPUT_AVAIL;
+        midi->output_ready = CA0106_MIDI_OUTPUT_READY;
+
+        midi->channel = channel;
+
+        midi->interrupt_enable = ca0106_midi_interrupt_enable;
+        midi->interrupt_disable = ca0106_midi_interrupt_disable;
+
+        midi->read = ca0106_midi_read;
+        midi->write = ca0106_midi_write;
+
+        midi->get_dev_id_card = ca0106_dev_id_card;
+        midi->get_dev_id_port = ca0106_dev_id_port;
+
+        midi->dev_id = chip;
+        
+        if ((err = ca_midi_init(chip, midi, 0, name)) < 0)
+                return err;
+
+        return 0;
+}
+
+
 static int __devinit snd_ca0106_probe(struct pci_dev *pci,
                                         const struct pci_device_id *pci_id)
 {
@@ -1360,6 +1457,20 @@ static int __devinit snd_ca0106_probe(struct pci_dev *pci,
                 return err;
         }
 
+#ifdef CONFIG_SND_DEBUG_DETECT
+        printk("ca0106: probe for MIDI channel A ...");
+#endif
+        if ((err = snd_ca0106_midi(chip,CA0106_MIDI_CHAN_A)) < 0) {
+                snd_card_free(card);
+#ifdef CONFIG_SND_DEBUG_DETECT
+                printk(" failed, err=0x%x\n",err);
+#endif
+                return err;
+        }
+#ifdef CONFIG_SND_DEBUG_DETECT
+        printk(" done.\n");
+#endif
+
         snd_ca0106_proc_init(chip);
 
         if ((err = snd_card_register(card)) < 0) {
diff --git a/sound/pci/ca0106/ca_midi.c b/sound/pci/ca0106/ca_midi.c
new file mode 100644
index 000000000000..f439d14876b0
--- /dev/null
+++ b/sound/pci/ca0106/ca_midi.c
@@ -0,0 +1,304 @@
+/* 
+ *  Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
+ *  Creative Audio MIDI, for the CA0106 Driver
+ *  Version: 0.0.1
+ *
+ *  Changelog:
+ *    Implementation is based on mpu401 and emu10k1x and
+ *    tested with ca0106.
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ *
+ */
+
+#include <linux/spinlock.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/rawmidi.h>
+
+#include "ca_midi.h"
+
+#define ca_midi_write_data(midi, data)  midi->write(midi, data, 0)
+#define ca_midi_write_cmd(midi, data)   midi->write(midi, data, 1)
+#define ca_midi_read_data(midi)         midi->read(midi, 0)
+#define ca_midi_read_stat(midi)         midi->read(midi, 1)
+#define ca_midi_input_avail(midi)       (!(ca_midi_read_stat(midi) & midi->input_avail))
+#define ca_midi_output_ready(midi)      (!(ca_midi_read_stat(midi) & midi->output_ready))
+
+static void ca_midi_clear_rx(ca_midi_t *midi)
+{
+        int timeout = 100000;
+        for (; timeout > 0 && ca_midi_input_avail(midi); timeout--)
+                ca_midi_read_data(midi);
+#ifdef CONFIG_SND_DEBUG
+        if (timeout <= 0)
+                snd_printk(KERN_ERR "ca_midi_clear_rx: timeout (status = 0x%x)\n", ca_midi_read_stat(midi));
+#endif
+}
+
+void ca_midi_interrupt(ca_midi_t *midi, unsigned int status) {
+        unsigned char byte;
+
+        if (midi->rmidi == NULL) {
+                midi->interrupt_disable(midi,midi->tx_enable | midi->rx_enable);
+                return;
+        }
+
+        spin_lock(&midi->input_lock);
+        if ((status & midi->ipr_rx) && ca_midi_input_avail(midi)) {
+                if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
+                        ca_midi_clear_rx(midi);
+                } else {
+                        byte = ca_midi_read_data(midi);
+                        if(midi->substream_input)
+                                snd_rawmidi_receive(midi->substream_input, &byte, 1);
+
+
+                }
+        }
+        spin_unlock(&midi->input_lock);
+
+        spin_lock(&midi->output_lock);
+        if ((status & midi->ipr_tx) && ca_midi_output_ready(midi)) {
+                if (midi->substream_output &&
+                    snd_rawmidi_transmit(midi->substream_output, &byte, 1) == 1) {
+                        ca_midi_write_data(midi, byte);
+                } else {
+                        midi->interrupt_disable(midi,midi->tx_enable);
+                }
+        }
+        spin_unlock(&midi->output_lock);
+
+}
+
+static void ca_midi_cmd(ca_midi_t *midi, unsigned char cmd, int ack)
+{
+        unsigned long flags;
+        int timeout, ok;
+
+        spin_lock_irqsave(&midi->input_lock, flags);
+        ca_midi_write_data(midi, 0x00);
+        /* ca_midi_clear_rx(midi); */
+
+        ca_midi_write_cmd(midi, cmd);
+        if (ack) {
+                ok = 0;
+                timeout = 10000;
+                while (!ok && timeout-- > 0) {
+                        if (ca_midi_input_avail(midi)) {
+                                if (ca_midi_read_data(midi) == midi->ack)
+                                        ok = 1;
+                        }
+                }
+                if (!ok && ca_midi_read_data(midi) == midi->ack)
+                        ok = 1;
+        } else {
+                ok = 1;
+        }
+        spin_unlock_irqrestore(&midi->input_lock, flags);
+        if (!ok)
+                snd_printk(KERN_ERR "ca_midi_cmd: 0x%x failed at 0x%x (status = 0x%x, data = 0x%x)!!!\n",
+                           cmd,
+                           midi->get_dev_id_port(midi->dev_id),
+                           ca_midi_read_stat(midi),
+                           ca_midi_read_data(midi));
+}
+
+static int ca_midi_input_open(snd_rawmidi_substream_t * substream)
+{
+        ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+        unsigned long flags;
+        
+        snd_assert(midi->dev_id, return -ENXIO);
+        spin_lock_irqsave(&midi->open_lock, flags);
+        midi->midi_mode |= CA_MIDI_MODE_INPUT;
+        midi->substream_input = substream;
+        if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+                ca_midi_cmd(midi, midi->reset, 1);
+                ca_midi_cmd(midi, midi->enter_uart, 1);
+        } else {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+        }
+        return 0;
+}
+
+static int ca_midi_output_open(snd_rawmidi_substream_t * substream)
+{
+        ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+        unsigned long flags;
+
+        snd_assert(midi->dev_id, return -ENXIO);
+        spin_lock_irqsave(&midi->open_lock, flags);
+        midi->midi_mode |= CA_MIDI_MODE_OUTPUT;
+        midi->substream_output = substream;
+        if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+                ca_midi_cmd(midi, midi->reset, 1);
+                ca_midi_cmd(midi, midi->enter_uart, 1);
+        } else {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+        }
+        return 0;
+}
+
+static int ca_midi_input_close(snd_rawmidi_substream_t * substream)
+{
+        ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+        unsigned long flags;
+
+        snd_assert(midi->dev_id, return -ENXIO);
+        spin_lock_irqsave(&midi->open_lock, flags);
+        midi->interrupt_disable(midi,midi->rx_enable);
+        midi->midi_mode &= ~CA_MIDI_MODE_INPUT;
+        midi->substream_input = NULL;
+        if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT)) {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+                ca_midi_cmd(midi, midi->reset, 0);
+        } else {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+        }
+        return 0;
+}
+
+static int ca_midi_output_close(snd_rawmidi_substream_t * substream)
+{
+        ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+        unsigned long flags;
+        snd_assert(midi->dev_id, return -ENXIO);
+        
+        spin_lock_irqsave(&midi->open_lock, flags);
+
+        midi->interrupt_disable(midi,midi->tx_enable);
+        midi->midi_mode &= ~CA_MIDI_MODE_OUTPUT;
+        midi->substream_output = NULL;
+        
+        if (!(midi->midi_mode & CA_MIDI_MODE_INPUT)) {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+                ca_midi_cmd(midi, midi->reset, 0);
+        } else {
+                spin_unlock_irqrestore(&midi->open_lock, flags);
+        }
+        return 0;
+}
+
+static void ca_midi_input_trigger(snd_rawmidi_substream_t * substream, int up)
+{
+        ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+        snd_assert(midi->dev_id, return);
+
+        if (up) {
+                midi->interrupt_enable(midi,midi->rx_enable);
+        } else {
+                midi->interrupt_disable(midi, midi->rx_enable);
+        }
+}
+
+static void ca_midi_output_trigger(snd_rawmidi_substream_t * substream, int up)
+{
+        ca_midi_t *midi = (ca_midi_t *)substream->rmidi->private_data;
+        unsigned long flags;
+
+        snd_assert(midi->dev_id, return);
+
+        if (up) {
+                int max = 4;
+                unsigned char byte;
+
+                spin_lock_irqsave(&midi->output_lock, flags);
+        
+                /* try to send some amount of bytes here before interrupts */
+                while (max > 0) {
+                        if (ca_midi_output_ready(midi)) {
+                                if (!(midi->midi_mode & CA_MIDI_MODE_OUTPUT) ||
+                                    snd_rawmidi_transmit(substream, &byte, 1) != 1) {
+                                        /* no more data */
+                                        spin_unlock_irqrestore(&midi->output_lock, flags);
+                                        return;
+                                }
+                                ca_midi_write_data(midi, byte);
+                                max--;
+                        } else {
+                                break;
+                        }
+                }
+
+                spin_unlock_irqrestore(&midi->output_lock, flags);
+                midi->interrupt_enable(midi,midi->tx_enable);
+
+        } else {
+                midi->interrupt_disable(midi,midi->tx_enable);
+        }
+}
+
+static snd_rawmidi_ops_t ca_midi_output =
+{
+        .open =         ca_midi_output_open,
+        .close =        ca_midi_output_close,
+        .trigger =      ca_midi_output_trigger,
+};
+
+static snd_rawmidi_ops_t ca_midi_input =
+{
+        .open =         ca_midi_input_open,
+        .close =        ca_midi_input_close,
+        .trigger =      ca_midi_input_trigger,
+};
+
+void ca_midi_free(ca_midi_t *midi) {
+        midi->interrupt = NULL;
+        midi->interrupt_enable = NULL;
+        midi->interrupt_disable = NULL;
+        midi->read = NULL;
+        midi->write = NULL;
+        midi->get_dev_id_card = NULL;
+        midi->get_dev_id_port = NULL;
+        midi->rmidi = NULL;
+}
+
+static void ca_rmidi_free(snd_rawmidi_t *rmidi)
+{
+        ca_midi_free((ca_midi_t *)rmidi->private_data);
+}
+
+int __devinit ca_midi_init(void *dev_id, ca_midi_t *midi, int device, char *name)
+{
+        snd_rawmidi_t *rmidi;
+        int err;
+
+        if ((err = snd_rawmidi_new(midi->get_dev_id_card(midi->dev_id), name, device, 1, 1, &rmidi)) < 0)
+                return err;
+
+        midi->dev_id = dev_id;
+        midi->interrupt = ca_midi_interrupt;
+
+        spin_lock_init(&midi->open_lock);
+        spin_lock_init(&midi->input_lock);
+        spin_lock_init(&midi->output_lock);
+
+        strcpy(rmidi->name, name);
+        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &ca_midi_output);
+        snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &ca_midi_input);
+        rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT |
+                             SNDRV_RAWMIDI_INFO_INPUT |
+                             SNDRV_RAWMIDI_INFO_DUPLEX;
+        rmidi->private_data = midi;
+        rmidi->private_free = ca_rmidi_free;
+        
+        midi->rmidi = rmidi;
+        return 0;
+}
+
diff --git a/sound/pci/ca0106/ca_midi.h b/sound/pci/ca0106/ca_midi.h
new file mode 100644
index 000000000000..95c8e1c170b1
--- /dev/null
+++ b/sound/pci/ca0106/ca_midi.h
@@ -0,0 +1,72 @@
+/* 
+ *  Copyright 10/16/2005 Tilman Kranz <tilde@tk-sls.de>
+ *  Creative Audio MIDI, for the CA0106 Driver
+ *  Version: 0.0.1
+ *
+ *  Changelog:
+ *    See ca_midi.c
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ */
+
+#include<linux/spinlock.h>
+#include<sound/rawmidi.h>
+#include<sound/mpu401.h>
+
+#define CA_MIDI_MODE_INPUT      MPU401_MODE_INPUT
+#define CA_MIDI_MODE_OUTPUT     MPU401_MODE_OUTPUT
+
+typedef struct ca_midi ca_midi_t;
+struct ca_midi {
+
+        snd_rawmidi_t *rmidi;
+        snd_rawmidi_substream_t *substream_input;
+        snd_rawmidi_substream_t *substream_output;
+
+        void *dev_id;
+
+        spinlock_t input_lock;
+        spinlock_t output_lock;
+        spinlock_t open_lock;
+
+        unsigned int channel;
+
+        unsigned int midi_mode;
+        int port;
+        int tx_enable, rx_enable;
+        int ipr_tx, ipr_rx;            
+        
+        int input_avail, output_ready;
+        int ack, reset, enter_uart;
+
+        void (*interrupt)(ca_midi_t *midi, unsigned int status);
+        void (*interrupt_enable)(ca_midi_t *midi, int intr);
+        void (*interrupt_disable)(ca_midi_t *midi, int intr);
+
+        unsigned char (*read)(ca_midi_t *midi, int idx);
+        void (*write)(ca_midi_t *midi, int data, int idx);
+
+        /* get info from dev_id */
+        snd_card_t *(*get_dev_id_card)(void *dev_id);
+        int (*get_dev_id_port)(void *dev_id);
+};
+
+void ca_midi_interrupt(ca_midi_t *midi, unsigned int status);
+
+int __devinit ca_midi_init(void *card, ca_midi_t *midi, int device, char *name);
+
+void ca_midi_free(ca_midi_t *midi);
+