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mpu401.c
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mpu401.c
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/*
* sound/oss/mpu401.c
*
* The low level driver for Roland MPU-401 compatible Midi cards.
*/
/*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*
*
* Thomas Sailer ioctl code reworked (vmalloc/vfree removed)
* Alan Cox modularisation, use normal request_irq, use dev_id
* Bartlomiej Zolnierkiewicz removed some __init to allow using many drivers
* Chris Rankin Update the module-usage counter for the coprocessor
* Zwane Mwaikambo Changed attach/unload resource freeing
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#define USE_SEQ_MACROS
#define USE_SIMPLE_MACROS
#include "sound_config.h"
#include "coproc.h"
#include "mpu401.h"
static int timer_mode = TMR_INTERNAL, timer_caps = TMR_INTERNAL;
struct mpu_config
{
int base; /*
* I/O base
*/
int irq;
int opened; /*
* Open mode
*/
int devno;
int synthno;
int uart_mode;
int initialized;
int mode;
#define MODE_MIDI 1
#define MODE_SYNTH 2
unsigned char version, revision;
unsigned int capabilities;
#define MPU_CAP_INTLG 0x10000000
#define MPU_CAP_SYNC 0x00000010
#define MPU_CAP_FSK 0x00000020
#define MPU_CAP_CLS 0x00000040
#define MPU_CAP_SMPTE 0x00000080
#define MPU_CAP_2PORT 0x00000001
int timer_flag;
#define MBUF_MAX 10
#define BUFTEST(dc) if (dc->m_ptr >= MBUF_MAX || dc->m_ptr < 0) \
{printk( "MPU: Invalid buffer pointer %d/%d, s=%d\n", dc->m_ptr, dc->m_left, dc->m_state);dc->m_ptr--;}
int m_busy;
unsigned char m_buf[MBUF_MAX];
int m_ptr;
int m_state;
int m_left;
unsigned char last_status;
void (*inputintr) (int dev, unsigned char data);
int shared_irq;
int *osp;
spinlock_t lock;
};
#define DATAPORT(base) (base)
#define COMDPORT(base) (base+1)
#define STATPORT(base) (base+1)
static void mpu401_close(int dev);
static inline int mpu401_status(struct mpu_config *devc)
{
return inb(STATPORT(devc->base));
}
#define input_avail(devc) (!(mpu401_status(devc)&INPUT_AVAIL))
#define output_ready(devc) (!(mpu401_status(devc)&OUTPUT_READY))
static inline void write_command(struct mpu_config *devc, unsigned char cmd)
{
outb(cmd, COMDPORT(devc->base));
}
static inline int read_data(struct mpu_config *devc)
{
return inb(DATAPORT(devc->base));
}
static inline void write_data(struct mpu_config *devc, unsigned char byte)
{
outb(byte, DATAPORT(devc->base));
}
#define OUTPUT_READY 0x40
#define INPUT_AVAIL 0x80
#define MPU_ACK 0xFE
#define MPU_RESET 0xFF
#define UART_MODE_ON 0x3F
static struct mpu_config dev_conf[MAX_MIDI_DEV];
static int n_mpu_devs;
static int reset_mpu401(struct mpu_config *devc);
static void set_uart_mode(int dev, struct mpu_config *devc, int arg);
static int mpu_timer_init(int midi_dev);
static void mpu_timer_interrupt(void);
static void timer_ext_event(struct mpu_config *devc, int event, int parm);
static struct synth_info mpu_synth_info_proto = {
"MPU-401 MIDI interface",
0,
SYNTH_TYPE_MIDI,
MIDI_TYPE_MPU401,
0, 128,
0, 128,
SYNTH_CAP_INPUT
};
static struct synth_info mpu_synth_info[MAX_MIDI_DEV];
/*
* States for the input scanner
*/
#define ST_INIT 0 /* Ready for timing byte or msg */
#define ST_TIMED 1 /* Leading timing byte rcvd */
#define ST_DATABYTE 2 /* Waiting for (nr_left) data bytes */
#define ST_SYSMSG 100 /* System message (sysx etc). */
#define ST_SYSEX 101 /* System exclusive msg */
#define ST_MTC 102 /* Midi Time Code (MTC) qframe msg */
#define ST_SONGSEL 103 /* Song select */
#define ST_SONGPOS 104 /* Song position pointer */
static unsigned char len_tab[] = /* # of data bytes following a status
*/
{
2, /* 8x */
2, /* 9x */
2, /* Ax */
2, /* Bx */
1, /* Cx */
1, /* Dx */
2, /* Ex */
0 /* Fx */
};
#define STORE(cmd) \
{ \
int len; \
unsigned char obuf[8]; \
cmd; \
seq_input_event(obuf, len); \
}
#define _seqbuf obuf
#define _seqbufptr 0
#define _SEQ_ADVBUF(x) len=x
static int mpu_input_scanner(struct mpu_config *devc, unsigned char midic)
{
switch (devc->m_state)
{
case ST_INIT:
switch (midic)
{
case 0xf8:
/* Timer overflow */
break;
case 0xfc:
printk("<all end>");
break;
case 0xfd:
if (devc->timer_flag)
mpu_timer_interrupt();
break;
case 0xfe:
return MPU_ACK;
case 0xf0:
case 0xf1:
case 0xf2:
case 0xf3:
case 0xf4:
case 0xf5:
case 0xf6:
case 0xf7:
printk("<Trk data rq #%d>", midic & 0x0f);
break;
case 0xf9:
printk("<conductor rq>");
break;
case 0xff:
devc->m_state = ST_SYSMSG;
break;
default:
if (midic <= 0xef)
{
/* printk( "mpu time: %d ", midic); */
devc->m_state = ST_TIMED;
}
else
printk("<MPU: Unknown event %02x> ", midic);
}
break;
case ST_TIMED:
{
int msg = ((int) (midic & 0xf0) >> 4);
devc->m_state = ST_DATABYTE;
if (msg < 8) /* Data byte */
{
/* printk( "midi msg (running status) "); */
msg = ((int) (devc->last_status & 0xf0) >> 4);
msg -= 8;
devc->m_left = len_tab[msg] - 1;
devc->m_ptr = 2;
devc->m_buf[0] = devc->last_status;
devc->m_buf[1] = midic;
if (devc->m_left <= 0)
{
devc->m_state = ST_INIT;
do_midi_msg(devc->synthno, devc->m_buf, devc->m_ptr);
devc->m_ptr = 0;
}
}
else if (msg == 0xf) /* MPU MARK */
{
devc->m_state = ST_INIT;
switch (midic)
{
case 0xf8:
/* printk( "NOP "); */
break;
case 0xf9:
/* printk( "meas end "); */
break;
case 0xfc:
/* printk( "data end "); */
break;
default:
printk("Unknown MPU mark %02x\n", midic);
}
}
else
{
devc->last_status = midic;
/* printk( "midi msg "); */
msg -= 8;
devc->m_left = len_tab[msg];
devc->m_ptr = 1;
devc->m_buf[0] = midic;
if (devc->m_left <= 0)
{
devc->m_state = ST_INIT;
do_midi_msg(devc->synthno, devc->m_buf, devc->m_ptr);
devc->m_ptr = 0;
}
}
}
break;
case ST_SYSMSG:
switch (midic)
{
case 0xf0:
printk("<SYX>");
devc->m_state = ST_SYSEX;
break;
case 0xf1:
devc->m_state = ST_MTC;
break;
case 0xf2:
devc->m_state = ST_SONGPOS;
devc->m_ptr = 0;
break;
case 0xf3:
devc->m_state = ST_SONGSEL;
break;
case 0xf6:
/* printk( "tune_request\n"); */
devc->m_state = ST_INIT;
/*
* Real time messages
*/
case 0xf8:
/* midi clock */
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_CLOCK, 0);
break;
case 0xfA:
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_START, 0);
break;
case 0xFB:
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_CONTINUE, 0);
break;
case 0xFC:
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_STOP, 0);
break;
case 0xFE:
/* active sensing */
devc->m_state = ST_INIT;
break;
case 0xff:
/* printk( "midi hard reset"); */
devc->m_state = ST_INIT;
break;
default:
printk("unknown MIDI sysmsg %0x\n", midic);
devc->m_state = ST_INIT;
}
break;
case ST_MTC:
devc->m_state = ST_INIT;
printk("MTC frame %x02\n", midic);
break;
case ST_SYSEX:
if (midic == 0xf7)
{
printk("<EOX>");
devc->m_state = ST_INIT;
}
else
printk("%02x ", midic);
break;
case ST_SONGPOS:
BUFTEST(devc);
devc->m_buf[devc->m_ptr++] = midic;
if (devc->m_ptr == 2)
{
devc->m_state = ST_INIT;
devc->m_ptr = 0;
timer_ext_event(devc, TMR_SPP,
((devc->m_buf[1] & 0x7f) << 7) |
(devc->m_buf[0] & 0x7f));
}
break;
case ST_DATABYTE:
BUFTEST(devc);
devc->m_buf[devc->m_ptr++] = midic;
if ((--devc->m_left) <= 0)
{
devc->m_state = ST_INIT;
do_midi_msg(devc->synthno, devc->m_buf, devc->m_ptr);
devc->m_ptr = 0;
}
break;
default:
printk("Bad state %d ", devc->m_state);
devc->m_state = ST_INIT;
}
return 1;
}
static void mpu401_input_loop(struct mpu_config *devc)
{
unsigned long flags;
int busy;
int n;
spin_lock_irqsave(&devc->lock,flags);
busy = devc->m_busy;
devc->m_busy = 1;
spin_unlock_irqrestore(&devc->lock,flags);
if (busy) /* Already inside the scanner */
return;
n = 50;
while (input_avail(devc) && n-- > 0)
{
unsigned char c = read_data(devc);
if (devc->mode == MODE_SYNTH)
{
mpu_input_scanner(devc, c);
}
else if (devc->opened & OPEN_READ && devc->inputintr != NULL)
devc->inputintr(devc->devno, c);
}
devc->m_busy = 0;
}
static irqreturn_t mpuintr(int irq, void *dev_id)
{
struct mpu_config *devc;
int dev = (int)(unsigned long) dev_id;
int handled = 0;
devc = &dev_conf[dev];
if (input_avail(devc))
{
handled = 1;
if (devc->base != 0 && (devc->opened & OPEN_READ || devc->mode == MODE_SYNTH))
mpu401_input_loop(devc);
else
{
/* Dummy read (just to acknowledge the interrupt) */
read_data(devc);
}
}
return IRQ_RETVAL(handled);
}
static int mpu401_open(int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
int err;
struct mpu_config *devc;
struct coproc_operations *coprocessor;
if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
return -ENXIO;
devc = &dev_conf[dev];
if (devc->opened)
return -EBUSY;
/*
* Verify that the device is really running.
* Some devices (such as Ensoniq SoundScape don't
* work before the on board processor (OBP) is initialized
* by downloading its microcode.
*/
if (!devc->initialized)
{
if (mpu401_status(devc) == 0xff) /* Bus float */
{
printk(KERN_ERR "mpu401: Device not initialized properly\n");
return -EIO;
}
reset_mpu401(devc);
}
if ( (coprocessor = midi_devs[dev]->coproc) != NULL )
{
if (!try_module_get(coprocessor->owner)) {
mpu401_close(dev);
return -ENODEV;
}
if ((err = coprocessor->open(coprocessor->devc, COPR_MIDI)) < 0)
{
printk(KERN_WARNING "MPU-401: Can't access coprocessor device\n");
mpu401_close(dev);
return err;
}
}
set_uart_mode(dev, devc, 1);
devc->mode = MODE_MIDI;
devc->synthno = 0;
mpu401_input_loop(devc);
devc->inputintr = input;
devc->opened = mode;
return 0;
}
static void mpu401_close(int dev)
{
struct mpu_config *devc;
struct coproc_operations *coprocessor;
devc = &dev_conf[dev];
if (devc->uart_mode)
reset_mpu401(devc); /*
* This disables the UART mode
*/
devc->mode = 0;
devc->inputintr = NULL;
coprocessor = midi_devs[dev]->coproc;
if (coprocessor) {
coprocessor->close(coprocessor->devc, COPR_MIDI);
module_put(coprocessor->owner);
}
devc->opened = 0;
}
static int mpu401_out(int dev, unsigned char midi_byte)
{
int timeout;
unsigned long flags;
struct mpu_config *devc;
devc = &dev_conf[dev];
/*
* Sometimes it takes about 30000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
spin_lock_irqsave(&devc->lock,flags);
if (!output_ready(devc))
{
printk(KERN_WARNING "mpu401: Send data timeout\n");
spin_unlock_irqrestore(&devc->lock,flags);
return 0;
}
write_data(devc, midi_byte);
spin_unlock_irqrestore(&devc->lock,flags);
return 1;
}
static int mpu401_command(int dev, mpu_command_rec * cmd)
{
int i, timeout, ok;
unsigned long flags;
struct mpu_config *devc;
devc = &dev_conf[dev];
if (devc->uart_mode) /*
* Not possible in UART mode
*/
{
printk(KERN_WARNING "mpu401: commands not possible in the UART mode\n");
return -EINVAL;
}
/*
* Test for input since pending input seems to block the output.
*/
if (input_avail(devc))
mpu401_input_loop(devc);
/*
* Sometimes it takes about 50000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
timeout = 50000;
retry:
if (timeout-- <= 0)
{
printk(KERN_WARNING "mpu401: Command (0x%x) timeout\n", (int) cmd->cmd);
return -EIO;
}
spin_lock_irqsave(&devc->lock,flags);
if (!output_ready(devc))
{
spin_unlock_irqrestore(&devc->lock,flags);
goto retry;
}
write_command(devc, cmd->cmd);
ok = 0;
for (timeout = 50000; timeout > 0 && !ok; timeout--)
{
if (input_avail(devc))
{
if (devc->opened && devc->mode == MODE_SYNTH)
{
if (mpu_input_scanner(devc, read_data(devc)) == MPU_ACK)
ok = 1;
}
else
{
/* Device is not currently open. Use simpler method */
if (read_data(devc) == MPU_ACK)
ok = 1;
}
}
}
if (!ok)
{
spin_unlock_irqrestore(&devc->lock,flags);
return -EIO;
}
if (cmd->nr_args)
{
for (i = 0; i < cmd->nr_args; i++)
{
for (timeout = 3000; timeout > 0 && !output_ready(devc); timeout--);
if (!mpu401_out(dev, cmd->data[i]))
{
spin_unlock_irqrestore(&devc->lock,flags);
printk(KERN_WARNING "mpu401: Command (0x%x), parm send failed.\n", (int) cmd->cmd);
return -EIO;
}
}
}
cmd->data[0] = 0;
if (cmd->nr_returns)
{
for (i = 0; i < cmd->nr_returns; i++)
{
ok = 0;
for (timeout = 5000; timeout > 0 && !ok; timeout--)
if (input_avail(devc))
{
cmd->data[i] = read_data(devc);
ok = 1;
}
if (!ok)
{
spin_unlock_irqrestore(&devc->lock,flags);
return -EIO;
}
}
}
spin_unlock_irqrestore(&devc->lock,flags);
return 0;
}
static int mpu_cmd(int dev, int cmd, int data)
{
int ret;
static mpu_command_rec rec;
rec.cmd = cmd & 0xff;
rec.nr_args = ((cmd & 0xf0) == 0xE0);
rec.nr_returns = ((cmd & 0xf0) == 0xA0);
rec.data[0] = data & 0xff;
if ((ret = mpu401_command(dev, &rec)) < 0)
return ret;
return (unsigned char) rec.data[0];
}
static int mpu401_prefix_cmd(int dev, unsigned char status)
{
struct mpu_config *devc = &dev_conf[dev];
if (devc->uart_mode)
return 1;
if (status < 0xf0)
{
if (mpu_cmd(dev, 0xD0, 0) < 0)
return 0;
return 1;
}
switch (status)
{
case 0xF0:
if (mpu_cmd(dev, 0xDF, 0) < 0)
return 0;
return 1;
default:
return 0;
}
}
static int mpu401_start_read(int dev)
{
return 0;
}
static int mpu401_end_read(int dev)
{
return 0;
}
static int mpu401_ioctl(int dev, unsigned cmd, void __user *arg)
{
struct mpu_config *devc;
mpu_command_rec rec;
int val, ret;
devc = &dev_conf[dev];
switch (cmd)
{
case SNDCTL_MIDI_MPUMODE:
if (!(devc->capabilities & MPU_CAP_INTLG)) { /* No intelligent mode */
printk(KERN_WARNING "mpu401: Intelligent mode not supported by the HW\n");
return -EINVAL;
}
if (get_user(val, (int __user *)arg))
return -EFAULT;
set_uart_mode(dev, devc, !val);
return 0;
case SNDCTL_MIDI_MPUCMD:
if (copy_from_user(&rec, arg, sizeof(rec)))
return -EFAULT;
if ((ret = mpu401_command(dev, &rec)) < 0)
return ret;
if (copy_to_user(arg, &rec, sizeof(rec)))
return -EFAULT;
return 0;
default:
return -EINVAL;
}
}
static void mpu401_kick(int dev)
{
}
static int mpu401_buffer_status(int dev)
{
return 0; /*
* No data in buffers
*/
}
static int mpu_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
{
int midi_dev;
struct mpu_config *devc;
midi_dev = synth_devs[dev]->midi_dev;
if (midi_dev < 0 || midi_dev >= num_midis || midi_devs[midi_dev] == NULL)
return -ENXIO;
devc = &dev_conf[midi_dev];
switch (cmd)
{
case SNDCTL_SYNTH_INFO:
if (copy_to_user(arg, &mpu_synth_info[midi_dev],
sizeof(struct synth_info)))
return -EFAULT;
return 0;
case SNDCTL_SYNTH_MEMAVL:
return 0x7fffffff;
default:
return -EINVAL;
}
}
static int mpu_synth_open(int dev, int mode)
{
int midi_dev, err;
struct mpu_config *devc;
struct coproc_operations *coprocessor;
midi_dev = synth_devs[dev]->midi_dev;
if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev] == NULL)
return -ENXIO;
devc = &dev_conf[midi_dev];
/*
* Verify that the device is really running.
* Some devices (such as Ensoniq SoundScape don't
* work before the on board processor (OBP) is initialized
* by downloading its microcode.
*/
if (!devc->initialized)
{
if (mpu401_status(devc) == 0xff) /* Bus float */
{
printk(KERN_ERR "mpu401: Device not initialized properly\n");
return -EIO;
}
reset_mpu401(devc);
}
if (devc->opened)
return -EBUSY;
devc->mode = MODE_SYNTH;
devc->synthno = dev;
devc->inputintr = NULL;
coprocessor = midi_devs[midi_dev]->coproc;
if (coprocessor) {
if (!try_module_get(coprocessor->owner))
return -ENODEV;
if ((err = coprocessor->open(coprocessor->devc, COPR_MIDI)) < 0)
{
printk(KERN_WARNING "mpu401: Can't access coprocessor device\n");
return err;
}
}
devc->opened = mode;
reset_mpu401(devc);
if (mode & OPEN_READ)
{
mpu_cmd(midi_dev, 0x8B, 0); /* Enable data in stop mode */
mpu_cmd(midi_dev, 0x34, 0); /* Return timing bytes in stop mode */
mpu_cmd(midi_dev, 0x87, 0); /* Enable pitch & controller */
}
return 0;
}
static void mpu_synth_close(int dev)
{
int midi_dev;
struct mpu_config *devc;
struct coproc_operations *coprocessor;
midi_dev = synth_devs[dev]->midi_dev;
devc = &dev_conf[midi_dev];
mpu_cmd(midi_dev, 0x15, 0); /* Stop recording, playback and MIDI */
mpu_cmd(midi_dev, 0x8a, 0); /* Disable data in stopped mode */
devc->inputintr = NULL;
coprocessor = midi_devs[midi_dev]->coproc;
if (coprocessor) {
coprocessor->close(coprocessor->devc, COPR_MIDI);
module_put(coprocessor->owner);
}
devc->opened = 0;
devc->mode = 0;
}
#define MIDI_SYNTH_NAME "MPU-401 UART Midi"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include "midi_synth.h"
static struct synth_operations mpu401_synth_proto =
{
.owner = THIS_MODULE,
.id = "MPU401",
.info = NULL,
.midi_dev = 0,
.synth_type = SYNTH_TYPE_MIDI,
.synth_subtype = 0,
.open = mpu_synth_open,
.close = mpu_synth_close,
.ioctl = mpu_synth_ioctl,
.kill_note = midi_synth_kill_note,
.start_note = midi_synth_start_note,
.set_instr = midi_synth_set_instr,
.reset = midi_synth_reset,
.hw_control = midi_synth_hw_control,
.load_patch = midi_synth_load_patch,
.aftertouch = midi_synth_aftertouch,
.controller = midi_synth_controller,
.panning = midi_synth_panning,
.bender = midi_synth_bender,
.setup_voice = midi_synth_setup_voice,
.send_sysex = midi_synth_send_sysex
};
static struct synth_operations *mpu401_synth_operations[MAX_MIDI_DEV];
static struct midi_operations mpu401_midi_proto =
{
.owner = THIS_MODULE,
.info = {"MPU-401 Midi", 0, MIDI_CAP_MPU401, SNDCARD_MPU401},
.in_info = {0},
.open = mpu401_open,
.close = mpu401_close,
.ioctl = mpu401_ioctl,
.outputc = mpu401_out,
.start_read = mpu401_start_read,
.end_read = mpu401_end_read,
.kick = mpu401_kick,
.buffer_status = mpu401_buffer_status,
.prefix_cmd = mpu401_prefix_cmd
};
static struct midi_operations mpu401_midi_operations[MAX_MIDI_DEV];
static void mpu401_chk_version(int n, struct mpu_config *devc)
{
int tmp;
devc->version = devc->revision = 0;
tmp = mpu_cmd(n, 0xAC, 0);
if (tmp < 0)
return;
if ((tmp & 0xf0) > 0x20) /* Why it's larger than 2.x ??? */
return;
devc->version = tmp;
if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) {
devc->version = 0;
return;
}
devc->revision = tmp;
}
int attach_mpu401(struct address_info *hw_config, struct module *owner)
{
unsigned long flags;
char revision_char;
int m, ret;
struct mpu_config *devc;
hw_config->slots[1] = -1;
m = sound_alloc_mididev();
if (m == -1)
{
printk(KERN_WARNING "MPU-401: Too many midi devices detected\n");
ret = -ENOMEM;
goto out_err;
}
devc = &dev_conf[m];
devc->base = hw_config->io_base;
devc->osp = hw_config->osp;
devc->irq = hw_config->irq;
devc->opened = 0;
devc->uart_mode = 0;
devc->initialized = 0;
devc->version = 0;
devc->revision = 0;
devc->capabilities = 0;
devc->timer_flag = 0;
devc->m_busy = 0;
devc->m_state = ST_INIT;
devc->shared_irq = hw_config->always_detect;
devc->irq = hw_config->irq;
spin_lock_init(&devc->lock);
if (devc->irq < 0)
{
devc->irq *= -1;
devc->shared_irq = 1;
}
if (!hw_config->always_detect)
{
/* Verify the hardware again */
if (!reset_mpu401(devc))
{
printk(KERN_WARNING "mpu401: Device didn't respond\n");
ret = -ENODEV;
goto out_mididev;
}
if (!devc->shared_irq)
{
if (request_irq(devc->irq, mpuintr, 0, "mpu401",
hw_config) < 0)
{
printk(KERN_WARNING "mpu401: Failed to allocate IRQ%d\n", devc->irq);
ret = -ENOMEM;
goto out_mididev;