635 lines
16 KiB
C
635 lines
16 KiB
C
/*
|
|
* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
|
|
* Routines for control of MPU-401 in UART mode
|
|
*
|
|
* MPU-401 supports UART mode which is not capable generate transmit
|
|
* interrupts thus output is done via polling. Without interrupt,
|
|
* input is done also via polling. Do not expect good performance.
|
|
*
|
|
*
|
|
* 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
|
|
*
|
|
* 13-03-2003:
|
|
* Added support for different kind of hardware I/O. Build in choices
|
|
* are port and mmio. For other kind of I/O, set mpu->read and
|
|
* mpu->write to your own I/O functions.
|
|
*
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/errno.h>
|
|
#include <sound/core.h>
|
|
#include <sound/mpu401.h>
|
|
|
|
MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
|
|
MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
|
|
static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
|
|
|
|
/*
|
|
|
|
*/
|
|
|
|
#define snd_mpu401_input_avail(mpu) \
|
|
(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
|
|
#define snd_mpu401_output_ready(mpu) \
|
|
(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
|
|
|
|
/* Build in lowlevel io */
|
|
static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
|
|
unsigned long addr)
|
|
{
|
|
outb(data, addr);
|
|
}
|
|
|
|
static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
|
|
unsigned long addr)
|
|
{
|
|
return inb(addr);
|
|
}
|
|
|
|
static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
|
|
unsigned long addr)
|
|
{
|
|
writeb(data, (void __iomem *)addr);
|
|
}
|
|
|
|
static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
|
|
unsigned long addr)
|
|
{
|
|
return readb((void __iomem *)addr);
|
|
}
|
|
/* */
|
|
|
|
static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
|
|
{
|
|
int timeout = 100000;
|
|
for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
|
|
mpu->read(mpu, MPU401D(mpu));
|
|
#ifdef CONFIG_SND_DEBUG
|
|
if (timeout <= 0)
|
|
snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
|
|
mpu->read(mpu, MPU401C(mpu)));
|
|
#endif
|
|
}
|
|
|
|
static void uart_interrupt_tx(struct snd_mpu401 *mpu)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
|
|
test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
|
|
spin_lock_irqsave(&mpu->output_lock, flags);
|
|
snd_mpu401_uart_output_write(mpu);
|
|
spin_unlock_irqrestore(&mpu->output_lock, flags);
|
|
}
|
|
}
|
|
|
|
static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (mpu->info_flags & MPU401_INFO_INPUT) {
|
|
spin_lock_irqsave(&mpu->input_lock, flags);
|
|
if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
|
|
snd_mpu401_uart_input_read(mpu);
|
|
else
|
|
snd_mpu401_uart_clear_rx(mpu);
|
|
spin_unlock_irqrestore(&mpu->input_lock, flags);
|
|
}
|
|
if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
|
|
/* ok. for better Tx performance try do some output
|
|
when input is done */
|
|
uart_interrupt_tx(mpu);
|
|
}
|
|
|
|
/**
|
|
* snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
|
|
* @irq: the irq number
|
|
* @dev_id: mpu401 instance
|
|
*
|
|
* Processes the interrupt for MPU401-UART i/o.
|
|
*
|
|
* Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
|
|
*/
|
|
irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct snd_mpu401 *mpu = dev_id;
|
|
|
|
if (mpu == NULL)
|
|
return IRQ_NONE;
|
|
_snd_mpu401_uart_interrupt(mpu);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
|
|
|
|
/**
|
|
* snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
|
|
* @irq: the irq number
|
|
* @dev_id: mpu401 instance
|
|
*
|
|
* Processes the interrupt for MPU401-UART output.
|
|
*
|
|
* Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise.
|
|
*/
|
|
irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
|
|
{
|
|
struct snd_mpu401 *mpu = dev_id;
|
|
|
|
if (mpu == NULL)
|
|
return IRQ_NONE;
|
|
uart_interrupt_tx(mpu);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
|
|
|
|
/*
|
|
* timer callback
|
|
* reprogram the timer and call the interrupt job
|
|
*/
|
|
static void snd_mpu401_uart_timer(unsigned long data)
|
|
{
|
|
struct snd_mpu401 *mpu = (struct snd_mpu401 *)data;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mpu->timer_lock, flags);
|
|
/*mpu->mode |= MPU401_MODE_TIMER;*/
|
|
mod_timer(&mpu->timer, 1 + jiffies);
|
|
spin_unlock_irqrestore(&mpu->timer_lock, flags);
|
|
if (mpu->rmidi)
|
|
_snd_mpu401_uart_interrupt(mpu);
|
|
}
|
|
|
|
/*
|
|
* initialize the timer callback if not programmed yet
|
|
*/
|
|
static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave (&mpu->timer_lock, flags);
|
|
if (mpu->timer_invoked == 0) {
|
|
setup_timer(&mpu->timer, snd_mpu401_uart_timer,
|
|
(unsigned long)mpu);
|
|
mod_timer(&mpu->timer, 1 + jiffies);
|
|
}
|
|
mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER :
|
|
MPU401_MODE_OUTPUT_TIMER;
|
|
spin_unlock_irqrestore (&mpu->timer_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* remove the timer callback if still active
|
|
*/
|
|
static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave (&mpu->timer_lock, flags);
|
|
if (mpu->timer_invoked) {
|
|
mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
|
|
~MPU401_MODE_OUTPUT_TIMER;
|
|
if (! mpu->timer_invoked)
|
|
del_timer(&mpu->timer);
|
|
}
|
|
spin_unlock_irqrestore (&mpu->timer_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* send a UART command
|
|
* return zero if successful, non-zero for some errors
|
|
*/
|
|
|
|
static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
|
|
int ack)
|
|
{
|
|
unsigned long flags;
|
|
int timeout, ok;
|
|
|
|
spin_lock_irqsave(&mpu->input_lock, flags);
|
|
if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
|
|
mpu->write(mpu, 0x00, MPU401D(mpu));
|
|
/*snd_mpu401_uart_clear_rx(mpu);*/
|
|
}
|
|
/* ok. standard MPU-401 initialization */
|
|
if (mpu->hardware != MPU401_HW_SB) {
|
|
for (timeout = 1000; timeout > 0 &&
|
|
!snd_mpu401_output_ready(mpu); timeout--)
|
|
udelay(10);
|
|
#ifdef CONFIG_SND_DEBUG
|
|
if (!timeout)
|
|
snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
|
|
mpu->read(mpu, MPU401C(mpu)));
|
|
#endif
|
|
}
|
|
mpu->write(mpu, cmd, MPU401C(mpu));
|
|
if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
|
|
ok = 0;
|
|
timeout = 10000;
|
|
while (!ok && timeout-- > 0) {
|
|
if (snd_mpu401_input_avail(mpu)) {
|
|
if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
|
|
ok = 1;
|
|
}
|
|
}
|
|
if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
|
|
ok = 1;
|
|
} else
|
|
ok = 1;
|
|
spin_unlock_irqrestore(&mpu->input_lock, flags);
|
|
if (!ok) {
|
|
snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
|
|
"(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
|
|
mpu->read(mpu, MPU401C(mpu)),
|
|
mpu->read(mpu, MPU401D(mpu)));
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
|
|
{
|
|
if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
|
|
return -EIO;
|
|
if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* input/output open/close - protected by open_mutex in rawmidi.c
|
|
*/
|
|
static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
struct snd_mpu401 *mpu;
|
|
int err;
|
|
|
|
mpu = substream->rmidi->private_data;
|
|
if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
|
|
return err;
|
|
if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
|
|
if (snd_mpu401_do_reset(mpu) < 0)
|
|
goto error_out;
|
|
}
|
|
mpu->substream_input = substream;
|
|
set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
|
|
return 0;
|
|
|
|
error_out:
|
|
if (mpu->open_input && mpu->close_input)
|
|
mpu->close_input(mpu);
|
|
return -EIO;
|
|
}
|
|
|
|
static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
struct snd_mpu401 *mpu;
|
|
int err;
|
|
|
|
mpu = substream->rmidi->private_data;
|
|
if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
|
|
return err;
|
|
if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
|
|
if (snd_mpu401_do_reset(mpu) < 0)
|
|
goto error_out;
|
|
}
|
|
mpu->substream_output = substream;
|
|
set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
|
|
return 0;
|
|
|
|
error_out:
|
|
if (mpu->open_output && mpu->close_output)
|
|
mpu->close_output(mpu);
|
|
return -EIO;
|
|
}
|
|
|
|
static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
|
|
{
|
|
struct snd_mpu401 *mpu;
|
|
int err = 0;
|
|
|
|
mpu = substream->rmidi->private_data;
|
|
clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
|
|
mpu->substream_input = NULL;
|
|
if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
|
|
err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
|
|
if (mpu->close_input)
|
|
mpu->close_input(mpu);
|
|
if (err)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
|
|
{
|
|
struct snd_mpu401 *mpu;
|
|
int err = 0;
|
|
|
|
mpu = substream->rmidi->private_data;
|
|
clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
|
|
mpu->substream_output = NULL;
|
|
if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
|
|
err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
|
|
if (mpu->close_output)
|
|
mpu->close_output(mpu);
|
|
if (err)
|
|
return -EIO;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* trigger input callback
|
|
*/
|
|
static void
|
|
snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_mpu401 *mpu;
|
|
int max = 64;
|
|
|
|
mpu = substream->rmidi->private_data;
|
|
if (up) {
|
|
if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
|
|
&mpu->mode)) {
|
|
/* first time - flush FIFO */
|
|
while (max-- > 0)
|
|
mpu->read(mpu, MPU401D(mpu));
|
|
if (mpu->info_flags & MPU401_INFO_USE_TIMER)
|
|
snd_mpu401_uart_add_timer(mpu, 1);
|
|
}
|
|
|
|
/* read data in advance */
|
|
spin_lock_irqsave(&mpu->input_lock, flags);
|
|
snd_mpu401_uart_input_read(mpu);
|
|
spin_unlock_irqrestore(&mpu->input_lock, flags);
|
|
} else {
|
|
if (mpu->info_flags & MPU401_INFO_USE_TIMER)
|
|
snd_mpu401_uart_remove_timer(mpu, 1);
|
|
clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* transfer input pending data
|
|
* call with input_lock spinlock held
|
|
*/
|
|
static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
|
|
{
|
|
int max = 128;
|
|
unsigned char byte;
|
|
|
|
while (max-- > 0) {
|
|
if (! snd_mpu401_input_avail(mpu))
|
|
break; /* input not available */
|
|
byte = mpu->read(mpu, MPU401D(mpu));
|
|
if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
|
|
snd_rawmidi_receive(mpu->substream_input, &byte, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Tx FIFO sizes:
|
|
* CS4237B - 16 bytes
|
|
* AudioDrive ES1688 - 12 bytes
|
|
* S3 SonicVibes - 8 bytes
|
|
* SoundBlaster AWE 64 - 2 bytes (ugly hardware)
|
|
*/
|
|
|
|
/*
|
|
* write output pending bytes
|
|
* call with output_lock spinlock held
|
|
*/
|
|
static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
|
|
{
|
|
unsigned char byte;
|
|
int max = 256;
|
|
|
|
do {
|
|
if (snd_rawmidi_transmit_peek(mpu->substream_output,
|
|
&byte, 1) == 1) {
|
|
/*
|
|
* Try twice because there is hardware that insists on
|
|
* setting the output busy bit after each write.
|
|
*/
|
|
if (!snd_mpu401_output_ready(mpu) &&
|
|
!snd_mpu401_output_ready(mpu))
|
|
break; /* Tx FIFO full - try again later */
|
|
mpu->write(mpu, byte, MPU401D(mpu));
|
|
snd_rawmidi_transmit_ack(mpu->substream_output, 1);
|
|
} else {
|
|
snd_mpu401_uart_remove_timer (mpu, 0);
|
|
break; /* no other data - leave the tx loop */
|
|
}
|
|
} while (--max > 0);
|
|
}
|
|
|
|
/*
|
|
* output trigger callback
|
|
*/
|
|
static void
|
|
snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
struct snd_mpu401 *mpu;
|
|
|
|
mpu = substream->rmidi->private_data;
|
|
if (up) {
|
|
set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
|
|
|
|
/* try to add the timer at each output trigger,
|
|
* since the output timer might have been removed in
|
|
* snd_mpu401_uart_output_write().
|
|
*/
|
|
if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
|
|
snd_mpu401_uart_add_timer(mpu, 0);
|
|
|
|
/* output pending data */
|
|
spin_lock_irqsave(&mpu->output_lock, flags);
|
|
snd_mpu401_uart_output_write(mpu);
|
|
spin_unlock_irqrestore(&mpu->output_lock, flags);
|
|
} else {
|
|
if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
|
|
snd_mpu401_uart_remove_timer(mpu, 0);
|
|
clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
|
|
}
|
|
}
|
|
|
|
/*
|
|
|
|
*/
|
|
|
|
static struct snd_rawmidi_ops snd_mpu401_uart_output =
|
|
{
|
|
.open = snd_mpu401_uart_output_open,
|
|
.close = snd_mpu401_uart_output_close,
|
|
.trigger = snd_mpu401_uart_output_trigger,
|
|
};
|
|
|
|
static struct snd_rawmidi_ops snd_mpu401_uart_input =
|
|
{
|
|
.open = snd_mpu401_uart_input_open,
|
|
.close = snd_mpu401_uart_input_close,
|
|
.trigger = snd_mpu401_uart_input_trigger,
|
|
};
|
|
|
|
static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
|
|
{
|
|
struct snd_mpu401 *mpu = rmidi->private_data;
|
|
if (mpu->irq >= 0)
|
|
free_irq(mpu->irq, (void *) mpu);
|
|
release_and_free_resource(mpu->res);
|
|
kfree(mpu);
|
|
}
|
|
|
|
/**
|
|
* snd_mpu401_uart_new - create an MPU401-UART instance
|
|
* @card: the card instance
|
|
* @device: the device index, zero-based
|
|
* @hardware: the hardware type, MPU401_HW_XXXX
|
|
* @port: the base address of MPU401 port
|
|
* @info_flags: bitflags MPU401_INFO_XXX
|
|
* @irq: the ISA irq number, -1 if not to be allocated
|
|
* @rrawmidi: the pointer to store the new rawmidi instance
|
|
*
|
|
* Creates a new MPU-401 instance.
|
|
*
|
|
* Note that the rawmidi instance is returned on the rrawmidi argument,
|
|
* not the mpu401 instance itself. To access to the mpu401 instance,
|
|
* cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
|
|
*
|
|
* Return: Zero if successful, or a negative error code.
|
|
*/
|
|
int snd_mpu401_uart_new(struct snd_card *card, int device,
|
|
unsigned short hardware,
|
|
unsigned long port,
|
|
unsigned int info_flags,
|
|
int irq,
|
|
struct snd_rawmidi ** rrawmidi)
|
|
{
|
|
struct snd_mpu401 *mpu;
|
|
struct snd_rawmidi *rmidi;
|
|
int in_enable, out_enable;
|
|
int err;
|
|
|
|
if (rrawmidi)
|
|
*rrawmidi = NULL;
|
|
if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT)))
|
|
info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT;
|
|
in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
|
|
out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
|
|
if ((err = snd_rawmidi_new(card, "MPU-401U", device,
|
|
out_enable, in_enable, &rmidi)) < 0)
|
|
return err;
|
|
mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
|
|
if (mpu == NULL) {
|
|
snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
|
|
snd_device_free(card, rmidi);
|
|
return -ENOMEM;
|
|
}
|
|
rmidi->private_data = mpu;
|
|
rmidi->private_free = snd_mpu401_uart_free;
|
|
spin_lock_init(&mpu->input_lock);
|
|
spin_lock_init(&mpu->output_lock);
|
|
spin_lock_init(&mpu->timer_lock);
|
|
mpu->hardware = hardware;
|
|
mpu->irq = -1;
|
|
if (! (info_flags & MPU401_INFO_INTEGRATED)) {
|
|
int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
|
|
mpu->res = request_region(port, res_size, "MPU401 UART");
|
|
if (mpu->res == NULL) {
|
|
snd_printk(KERN_ERR "mpu401_uart: "
|
|
"unable to grab port 0x%lx size %d\n",
|
|
port, res_size);
|
|
snd_device_free(card, rmidi);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
if (info_flags & MPU401_INFO_MMIO) {
|
|
mpu->write = mpu401_write_mmio;
|
|
mpu->read = mpu401_read_mmio;
|
|
} else {
|
|
mpu->write = mpu401_write_port;
|
|
mpu->read = mpu401_read_port;
|
|
}
|
|
mpu->port = port;
|
|
if (hardware == MPU401_HW_PC98II)
|
|
mpu->cport = port + 2;
|
|
else
|
|
mpu->cport = port + 1;
|
|
if (irq >= 0) {
|
|
if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
|
|
"MPU401 UART", (void *) mpu)) {
|
|
snd_printk(KERN_ERR "mpu401_uart: "
|
|
"unable to grab IRQ %d\n", irq);
|
|
snd_device_free(card, rmidi);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
|
|
info_flags |= MPU401_INFO_USE_TIMER;
|
|
mpu->info_flags = info_flags;
|
|
mpu->irq = irq;
|
|
if (card->shortname[0])
|
|
snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
|
|
card->shortname);
|
|
else
|
|
sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
|
|
if (out_enable) {
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
|
|
&snd_mpu401_uart_output);
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
|
|
}
|
|
if (in_enable) {
|
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
|
|
&snd_mpu401_uart_input);
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
|
|
if (out_enable)
|
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
|
|
}
|
|
mpu->rmidi = rmidi;
|
|
if (rrawmidi)
|
|
*rrawmidi = rmidi;
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_mpu401_uart_new);
|
|
|
|
/*
|
|
* INIT part
|
|
*/
|
|
|
|
static int __init alsa_mpu401_uart_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void __exit alsa_mpu401_uart_exit(void)
|
|
{
|
|
}
|
|
|
|
module_init(alsa_mpu401_uart_init)
|
|
module_exit(alsa_mpu401_uart_exit)
|