[deliverable/linux.git] / sound / drivers / mpu401 / mpu401_uart.c

/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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. Also, if irq < 0, then
 *  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 <sound/driver.h>
#include <asm/io.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <sound/core.h>
#include <sound/mpu401.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.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)) & 0x80))
#define snd_mpu401_output_ready(mpu)	(!(mpu->read(mpu, MPU401C(mpu)) & 0x40))

#define MPU401_RESET		0xff
#define MPU401_ENTER_UART	0x3f
#define MPU401_ACK		0xfe

/* 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)
{
	if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
	    test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
		spin_lock(&mpu->output_lock);
		snd_mpu401_uart_output_write(mpu);
		spin_unlock(&mpu->output_lock);
	}
}

static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
{
	if (mpu->info_flags & MPU401_INFO_INPUT) {
		spin_lock(&mpu->input_lock);
		if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
			snd_mpu401_uart_input_read(mpu);
		else
			snd_mpu401_uart_clear_rx(mpu);
		spin_unlock(&mpu->input_lock);
	}
	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.
 */
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.
 */
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;*/
	mpu->timer.expires = 1 + jiffies;
	add_timer(&mpu->timer);
	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) {
		init_timer(&mpu->timer);
		mpu->timer.data = (unsigned long)mpu;
		mpu->timer.function = snd_mpu401_uart_timer;
		mpu->timer.expires = 1 + jiffies;
		add_timer(&mpu->timer);
	} 
	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) {
		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 (!(mpu->info_flags & MPU401_INFO_UART_ONLY) &&
	    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->irq < 0)
				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->irq < 0)
			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, timeout;

	do {
		if (snd_rawmidi_transmit_peek(mpu->substream_output,
					      &byte, 1) == 1) {
			for (timeout = 100; timeout > 0; timeout--) {
				if (snd_mpu401_output_ready(mpu))
					break;
			}
			if (timeout == 0)
				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_flags && 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 irq number, -1 if no interrupt for mpu
 * @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
 * @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).
 *
 * Returns 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, int irq_flags,
			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;
	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 && irq_flags) {
		if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
				"MPU401 UART", (void *) mpu)) {
			snd_printk(KERN_ERR "mpu401_uart: "
				   "unable to grab IRQ %d\n", irq);
			snd_device_free(card, rmidi);
			return -EBUSY;
		}
	}
	mpu->info_flags = info_flags;
	mpu->irq = irq;
	mpu->irq_flags = irq_flags;
	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)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
	3	* Routines for control of MPU-401 in UART mode
	4	*
	5	* MPU-401 supports UART mode which is not capable generate transmit
	6	* interrupts thus output is done via polling. Also, if irq < 0, then
	7	* input is done also via polling. Do not expect good performance.
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*
	24	* 13-03-2003:
	25	* Added support for different kind of hardware I/O. Build in choices
	26	* are port and mmio. For other kind of I/O, set mpu->read and
	27	* mpu->write to your own I/O functions.
	28	*
	29	*/
	30
	31	#include <sound/driver.h>
	32	#include <asm/io.h>
	33	#include <linux/delay.h>
	34	#include <linux/init.h>
	35	#include <linux/slab.h>
	36	#include <linux/ioport.h>
	37	#include <linux/interrupt.h>
	38	#include <linux/errno.h>
	39	#include <sound/core.h>
	40	#include <sound/mpu401.h>
	41
	42	MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
	43	MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode");
	44	MODULE_LICENSE("GPL");
	45
e1fad17b TI	46	static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu);
e1fad17b TI	47	static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu);
1da177e4 LT	48
	49	/*
	50
	51	*/
	52
	53	#define snd_mpu401_input_avail(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x80))
	54	#define snd_mpu401_output_ready(mpu) (!(mpu->read(mpu, MPU401C(mpu)) & 0x40))
	55
	56	#define MPU401_RESET 0xff
	57	#define MPU401_ENTER_UART 0x3f
	58	#define MPU401_ACK 0xfe
	59
	60	/* Build in lowlevel io */
2851d963 TI	61	static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
2851d963 TI	62	unsigned long addr)
1da177e4 LT	63	{
	64	outb(data, addr);
	65	}
	66
2851d963 TI	67	static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
2851d963 TI	68	unsigned long addr)
1da177e4 LT	69	{
	70	return inb(addr);
	71	}
	72
2851d963 TI	73	static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
2851d963 TI	74	unsigned long addr)
1da177e4 LT	75	{
	76	writeb(data, (void __iomem *)addr);
	77	}
	78
2851d963 TI	79	static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
2851d963 TI	80	unsigned long addr)
1da177e4 LT	81	{
	82	return readb((void __iomem *)addr);
	83	}
	84	/* */
	85
e1fad17b	86	static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
1da177e4 LT	87	{
	88	int timeout = 100000;
	89	for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
	90	mpu->read(mpu, MPU401D(mpu));
	91	#ifdef CONFIG_SND_DEBUG
	92	if (timeout <= 0)
2851d963 TI	93	snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
2851d963 TI	94	mpu->read(mpu, MPU401C(mpu)));
1da177e4 LT	95	#endif
	96	}
	97
302e4c2f	98	static void uart_interrupt_tx(struct snd_mpu401 *mpu)
1da177e4	99	{
1da177e4 LT	100	if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
	101	test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
	102	spin_lock(&mpu->output_lock);
	103	snd_mpu401_uart_output_write(mpu);
	104	spin_unlock(&mpu->output_lock);
	105	}
	106	}
	107
302e4c2f TI	108	static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
	109	{
	110	if (mpu->info_flags & MPU401_INFO_INPUT) {
	111	spin_lock(&mpu->input_lock);
	112	if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
	113	snd_mpu401_uart_input_read(mpu);
	114	else
	115	snd_mpu401_uart_clear_rx(mpu);
	116	spin_unlock(&mpu->input_lock);
	117	}
	118	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
	119	/* ok. for better Tx performance try do some output
	120	when input is done */
	121	uart_interrupt_tx(mpu);
	122	}
	123
1da177e4 LT	124	/**
	125	* snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
	126	* @irq: the irq number
	127	* @dev_id: mpu401 instance
1da177e4 LT	128	*
	129	* Processes the interrupt for MPU401-UART i/o.
	130	*/
7d12e780	131	irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
1da177e4	132	{
e1fad17b	133	struct snd_mpu401 *mpu = dev_id;
1da177e4 LT	134
	135	if (mpu == NULL)
	136	return IRQ_NONE;
	137	_snd_mpu401_uart_interrupt(mpu);
	138	return IRQ_HANDLED;
	139	}
	140
2851d963 TI	141	EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
2851d963 TI	142
302e4c2f TI	143	/**
	144	* snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
	145	* @irq: the irq number
	146	* @dev_id: mpu401 instance
302e4c2f TI	147	*
	148	* Processes the interrupt for MPU401-UART output.
	149	*/
7d12e780	150	irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
302e4c2f TI	151	{
	152	struct snd_mpu401 *mpu = dev_id;
	153
	154	if (mpu == NULL)
	155	return IRQ_NONE;
	156	uart_interrupt_tx(mpu);
	157	return IRQ_HANDLED;
	158	}
	159
	160	EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
	161
1da177e4 LT	162	/*
	163	* timer callback
	164	* reprogram the timer and call the interrupt job
	165	*/
	166	static void snd_mpu401_uart_timer(unsigned long data)
	167	{
e1fad17b	168	struct snd_mpu401 mpu = (struct snd_mpu401 )data;
b32425ac	169	unsigned long flags;
1da177e4	170
b32425ac	171	spin_lock_irqsave(&mpu->timer_lock, flags);
1da177e4 LT	172	/mpu->mode \|= MPU401_MODE_TIMER;/
	173	mpu->timer.expires = 1 + jiffies;
	174	add_timer(&mpu->timer);
b32425ac	175	spin_unlock_irqrestore(&mpu->timer_lock, flags);
1da177e4 LT	176	if (mpu->rmidi)
	177	_snd_mpu401_uart_interrupt(mpu);
	178	}
	179
	180	/*
	181	* initialize the timer callback if not programmed yet
	182	*/
e1fad17b	183	static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
1da177e4 LT	184	{
	185	unsigned long flags;
	186
	187	spin_lock_irqsave (&mpu->timer_lock, flags);
	188	if (mpu->timer_invoked == 0) {
	189	init_timer(&mpu->timer);
	190	mpu->timer.data = (unsigned long)mpu;
	191	mpu->timer.function = snd_mpu401_uart_timer;
	192	mpu->timer.expires = 1 + jiffies;
	193	add_timer(&mpu->timer);
	194	}
2851d963 TI	195	mpu->timer_invoked \|= input ? MPU401_MODE_INPUT_TIMER :
2851d963 TI	196	MPU401_MODE_OUTPUT_TIMER;
1da177e4 LT	197	spin_unlock_irqrestore (&mpu->timer_lock, flags);
	198	}
	199
	200	/*
	201	* remove the timer callback if still active
	202	*/
e1fad17b	203	static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
1da177e4 LT	204	{
	205	unsigned long flags;
	206
	207	spin_lock_irqsave (&mpu->timer_lock, flags);
	208	if (mpu->timer_invoked) {
2851d963 TI	209	mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
2851d963 TI	210	~MPU401_MODE_OUTPUT_TIMER;
1da177e4 LT	211	if (! mpu->timer_invoked)
	212	del_timer(&mpu->timer);
	213	}
	214	spin_unlock_irqrestore (&mpu->timer_lock, flags);
	215	}
	216
	217	/*
2851d963 TI	218	* send a UART command
2851d963 TI	219	* return zero if successful, non-zero for some errors
1da177e4 LT	220	*/
1da177e4 LT	221
962f831f	222	static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
2851d963	223	int ack)
1da177e4 LT	224	{
	225	unsigned long flags;
	226	int timeout, ok;
	227
	228	spin_lock_irqsave(&mpu->input_lock, flags);
	229	if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
	230	mpu->write(mpu, 0x00, MPU401D(mpu));
	231	/snd_mpu401_uart_clear_rx(mpu);/
	232	}
	233	/* ok. standard MPU-401 initialization */
	234	if (mpu->hardware != MPU401_HW_SB) {
2851d963 TI	235	for (timeout = 1000; timeout > 0 &&
2851d963 TI	236	!snd_mpu401_output_ready(mpu); timeout--)
1da177e4 LT	237	udelay(10);
	238	#ifdef CONFIG_SND_DEBUG
	239	if (!timeout)
2851d963 TI	240	snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
2851d963 TI	241	mpu->read(mpu, MPU401C(mpu)));
1da177e4 LT	242	#endif
	243	}
	244	mpu->write(mpu, cmd, MPU401C(mpu));
	245	if (ack) {
	246	ok = 0;
	247	timeout = 10000;
	248	while (!ok && timeout-- > 0) {
	249	if (snd_mpu401_input_avail(mpu)) {
	250	if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
	251	ok = 1;
	252	}
	253	}
	254	if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
	255	ok = 1;
2851d963	256	} else
1da177e4	257	ok = 1;
1da177e4	258	spin_unlock_irqrestore(&mpu->input_lock, flags);
962f831f	259	if (!ok) {
2851d963 TI	260	snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
	261	"(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
	262	mpu->read(mpu, MPU401C(mpu)),
	263	mpu->read(mpu, MPU401D(mpu)));
962f831f JM	264	return 1;
	265	}
	266	return 0;
1da177e4 LT	267	}
1da177e4 LT	268
8f7ba051 TI	269	static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
	270	{
	271	if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
	272	return -EIO;
	273	if (!(mpu->info_flags & MPU401_INFO_UART_ONLY) &&
69d8d3eb	274	snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
8f7ba051 TI	275	return -EIO;
	276	return 0;
	277	}
	278
1da177e4 LT	279	/*
	280	* input/output open/close - protected by open_mutex in rawmidi.c
	281	*/
e1fad17b	282	static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
1da177e4	283	{
e1fad17b	284	struct snd_mpu401 *mpu;
1da177e4 LT	285	int err;
	286
	287	mpu = substream->rmidi->private_data;
	288	if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
	289	return err;
	290	if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
8f7ba051	291	if (snd_mpu401_do_reset(mpu) < 0)
962f831f	292	goto error_out;
1da177e4 LT	293	}
	294	mpu->substream_input = substream;
	295	set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
	296	return 0;
962f831f JM	297
	298	error_out:
	299	if (mpu->open_input && mpu->close_input)
	300	mpu->close_input(mpu);
	301	return -EIO;
1da177e4 LT	302	}
1da177e4 LT	303
e1fad17b	304	static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
1da177e4	305	{
e1fad17b	306	struct snd_mpu401 *mpu;
1da177e4 LT	307	int err;
	308
	309	mpu = substream->rmidi->private_data;
	310	if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
	311	return err;
	312	if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
8f7ba051	313	if (snd_mpu401_do_reset(mpu) < 0)
962f831f	314	goto error_out;
1da177e4 LT	315	}
	316	mpu->substream_output = substream;
	317	set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
	318	return 0;
962f831f JM	319
	320	error_out:
	321	if (mpu->open_output && mpu->close_output)
	322	mpu->close_output(mpu);
	323	return -EIO;
1da177e4 LT	324	}
1da177e4 LT	325
e1fad17b	326	static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
1da177e4	327	{
e1fad17b	328	struct snd_mpu401 *mpu;
962f831f	329	int err = 0;
1da177e4 LT	330
	331	mpu = substream->rmidi->private_data;
	332	clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
	333	mpu->substream_input = NULL;
	334	if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
962f831f	335	err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
1da177e4 LT	336	if (mpu->close_input)
1da177e4 LT	337	mpu->close_input(mpu);
962f831f JM	338	if (err)
962f831f JM	339	return -EIO;
1da177e4 LT	340	return 0;
	341	}
	342
e1fad17b	343	static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
1da177e4	344	{
e1fad17b	345	struct snd_mpu401 *mpu;
962f831f	346	int err = 0;
1da177e4 LT	347
	348	mpu = substream->rmidi->private_data;
	349	clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
	350	mpu->substream_output = NULL;
	351	if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
962f831f	352	err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
1da177e4 LT	353	if (mpu->close_output)
1da177e4 LT	354	mpu->close_output(mpu);
962f831f JM	355	if (err)
962f831f JM	356	return -EIO;
1da177e4 LT	357	return 0;
	358	}
	359
	360	/*
	361	* trigger input callback
	362	*/
2851d963 TI	363	static void
2851d963 TI	364	snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 LT	365	{
1da177e4 LT	366	unsigned long flags;
e1fad17b	367	struct snd_mpu401 *mpu;
1da177e4 LT	368	int max = 64;
	369
	370	mpu = substream->rmidi->private_data;
	371	if (up) {
2851d963 TI	372	if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
2851d963 TI	373	&mpu->mode)) {
1da177e4 LT	374	/* first time - flush FIFO */
	375	while (max-- > 0)
	376	mpu->read(mpu, MPU401D(mpu));
	377	if (mpu->irq < 0)
	378	snd_mpu401_uart_add_timer(mpu, 1);
	379	}
	380
	381	/* read data in advance */
	382	spin_lock_irqsave(&mpu->input_lock, flags);
	383	snd_mpu401_uart_input_read(mpu);
	384	spin_unlock_irqrestore(&mpu->input_lock, flags);
	385	} else {
	386	if (mpu->irq < 0)
	387	snd_mpu401_uart_remove_timer(mpu, 1);
	388	clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
	389	}
962f831f	390
1da177e4 LT	391	}
	392
	393	/*
	394	* transfer input pending data
	395	* call with input_lock spinlock held
	396	*/
e1fad17b	397	static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
1da177e4 LT	398	{
	399	int max = 128;
	400	unsigned char byte;
	401
	402	while (max-- > 0) {
2851d963	403	if (! snd_mpu401_input_avail(mpu))
1da177e4	404	break; /* input not available */
2851d963 TI	405	byte = mpu->read(mpu, MPU401D(mpu));
	406	if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
	407	snd_rawmidi_receive(mpu->substream_input, &byte, 1);
1da177e4 LT	408	}
	409	}
	410
	411	/*
	412	* Tx FIFO sizes:
	413	* CS4237B - 16 bytes
	414	* AudioDrive ES1688 - 12 bytes
	415	* S3 SonicVibes - 8 bytes
	416	* SoundBlaster AWE 64 - 2 bytes (ugly hardware)
	417	*/
	418
	419	/*
	420	* write output pending bytes
	421	* call with output_lock spinlock held
	422	*/
e1fad17b	423	static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
1da177e4 LT	424	{
	425	unsigned char byte;
	426	int max = 256, timeout;
	427
	428	do {
2851d963 TI	429	if (snd_rawmidi_transmit_peek(mpu->substream_output,
2851d963 TI	430	&byte, 1) == 1) {
1da177e4	431	for (timeout = 100; timeout > 0; timeout--) {
2851d963	432	if (snd_mpu401_output_ready(mpu))
1da177e4	433	break;
1da177e4 LT	434	}
	435	if (timeout == 0)
	436	break; /* Tx FIFO full - try again later */
2851d963 TI	437	mpu->write(mpu, byte, MPU401D(mpu));
2851d963 TI	438	snd_rawmidi_transmit_ack(mpu->substream_output, 1);
1da177e4 LT	439	} else {
	440	snd_mpu401_uart_remove_timer (mpu, 0);
	441	break; /* no other data - leave the tx loop */
	442	}
	443	} while (--max > 0);
	444	}
	445
	446	/*
	447	* output trigger callback
	448	*/
2851d963 TI	449	static void
2851d963 TI	450	snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 LT	451	{
1da177e4 LT	452	unsigned long flags;
e1fad17b	453	struct snd_mpu401 *mpu;
1da177e4 LT	454
	455	mpu = substream->rmidi->private_data;
	456	if (up) {
	457	set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
	458
	459	/* try to add the timer at each output trigger,
	460	* since the output timer might have been removed in
	461	* snd_mpu401_uart_output_write().
	462	*/
302e4c2f TI	463	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
302e4c2f TI	464	snd_mpu401_uart_add_timer(mpu, 0);
1da177e4 LT	465
	466	/* output pending data */
	467	spin_lock_irqsave(&mpu->output_lock, flags);
	468	snd_mpu401_uart_output_write(mpu);
	469	spin_unlock_irqrestore(&mpu->output_lock, flags);
	470	} else {
302e4c2f TI	471	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
302e4c2f TI	472	snd_mpu401_uart_remove_timer(mpu, 0);
1da177e4 LT	473	clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
	474	}
	475	}
	476
	477	/*
	478
	479	*/
	480
e1fad17b	481	static struct snd_rawmidi_ops snd_mpu401_uart_output =
1da177e4 LT	482	{
	483	.open = snd_mpu401_uart_output_open,
	484	.close = snd_mpu401_uart_output_close,
	485	.trigger = snd_mpu401_uart_output_trigger,
	486	};
	487
e1fad17b	488	static struct snd_rawmidi_ops snd_mpu401_uart_input =
1da177e4 LT	489	{
	490	.open = snd_mpu401_uart_input_open,
	491	.close = snd_mpu401_uart_input_close,
	492	.trigger = snd_mpu401_uart_input_trigger,
	493	};
	494
e1fad17b	495	static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
1da177e4	496	{
e1fad17b	497	struct snd_mpu401 *mpu = rmidi->private_data;
1da177e4 LT	498	if (mpu->irq_flags && mpu->irq >= 0)
1da177e4 LT	499	free_irq(mpu->irq, (void *) mpu);
b1d5776d	500	release_and_free_resource(mpu->res);
1da177e4 LT	501	kfree(mpu);
	502	}
	503
	504	/**
	505	* snd_mpu401_uart_new - create an MPU401-UART instance
	506	* @card: the card instance
	507	* @device: the device index, zero-based
	508	* @hardware: the hardware type, MPU401_HW_XXXX
	509	* @port: the base address of MPU401 port
302e4c2f	510	* @info_flags: bitflags MPU401_INFO_XXX
1da177e4 LT	511	* @irq: the irq number, -1 if no interrupt for mpu
	512	* @irq_flags: the irq request flags (SA_XXX), 0 if irq was already reserved.
	513	* @rrawmidi: the pointer to store the new rawmidi instance
	514	*
	515	* Creates a new MPU-401 instance.
	516	*
	517	* Note that the rawmidi instance is returned on the rrawmidi argument,
	518	* not the mpu401 instance itself. To access to the mpu401 instance,
e1fad17b	519	* cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
1da177e4 LT	520	*
	521	* Returns zero if successful, or a negative error code.
	522	*/
e1fad17b	523	int snd_mpu401_uart_new(struct snd_card *card, int device,
1da177e4	524	unsigned short hardware,
302e4c2f TI	525	unsigned long port,
302e4c2f TI	526	unsigned int info_flags,
1da177e4	527	int irq, int irq_flags,
e1fad17b	528	struct snd_rawmidi ** rrawmidi)
1da177e4	529	{
e1fad17b TI	530	struct snd_mpu401 *mpu;
e1fad17b TI	531	struct snd_rawmidi *rmidi;
302e4c2f	532	int in_enable, out_enable;
1da177e4 LT	533	int err;
	534
	535	if (rrawmidi)
	536	*rrawmidi = NULL;
302e4c2f TI	537	if (! (info_flags & (MPU401_INFO_INPUT \| MPU401_INFO_OUTPUT)))
	538	info_flags \|= MPU401_INFO_INPUT \| MPU401_INFO_OUTPUT;
	539	in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
	540	out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
	541	if ((err = snd_rawmidi_new(card, "MPU-401U", device,
	542	out_enable, in_enable, &rmidi)) < 0)
1da177e4	543	return err;
561b220a	544	mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
1da177e4	545	if (mpu == NULL) {
73e77ba0	546	snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
1da177e4 LT	547	snd_device_free(card, rmidi);
	548	return -ENOMEM;
	549	}
	550	rmidi->private_data = mpu;
	551	rmidi->private_free = snd_mpu401_uart_free;
	552	spin_lock_init(&mpu->input_lock);
	553	spin_lock_init(&mpu->output_lock);
	554	spin_lock_init(&mpu->timer_lock);
	555	mpu->hardware = hardware;
302e4c2f	556	if (! (info_flags & MPU401_INFO_INTEGRATED)) {
1da177e4	557	int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
2851d963 TI	558	mpu->res = request_region(port, res_size, "MPU401 UART");
	559	if (mpu->res == NULL) {
	560	snd_printk(KERN_ERR "mpu401_uart: "
	561	"unable to grab port 0x%lx size %d\n",
	562	port, res_size);
1da177e4 LT	563	snd_device_free(card, rmidi);
	564	return -EBUSY;
	565	}
	566	}
302e4c2f	567	if (info_flags & MPU401_INFO_MMIO) {
1da177e4 LT	568	mpu->write = mpu401_write_mmio;
1da177e4 LT	569	mpu->read = mpu401_read_mmio;
302e4c2f	570	} else {
1da177e4 LT	571	mpu->write = mpu401_write_port;
1da177e4 LT	572	mpu->read = mpu401_read_port;
1da177e4 LT	573	}
	574	mpu->port = port;
	575	if (hardware == MPU401_HW_PC98II)
	576	mpu->cport = port + 2;
	577	else
	578	mpu->cport = port + 1;
	579	if (irq >= 0 && irq_flags) {
2851d963 TI	580	if (request_irq(irq, snd_mpu401_uart_interrupt, irq_flags,
	581	"MPU401 UART", (void *) mpu)) {
	582	snd_printk(KERN_ERR "mpu401_uart: "
	583	"unable to grab IRQ %d\n", irq);
1da177e4 LT	584	snd_device_free(card, rmidi);
	585	return -EBUSY;
	586	}
	587	}
302e4c2f	588	mpu->info_flags = info_flags;
1da177e4 LT	589	mpu->irq = irq;
	590	mpu->irq_flags = irq_flags;
	591	if (card->shortname[0])
2851d963 TI	592	snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
2851d963 TI	593	card->shortname);
1da177e4	594	else
2851d963	595	sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
302e4c2f TI	596	if (out_enable) {
	597	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
	598	&snd_mpu401_uart_output);
	599	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_OUTPUT;
	600	}
	601	if (in_enable) {
	602	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
	603	&snd_mpu401_uart_input);
	604	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_INPUT;
	605	if (out_enable)
	606	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_DUPLEX;
	607	}
1da177e4 LT	608	mpu->rmidi = rmidi;
	609	if (rrawmidi)
	610	*rrawmidi = rmidi;
	611	return 0;
	612	}
	613
1da177e4 LT	614	EXPORT_SYMBOL(snd_mpu401_uart_new);
	615
	616	/*
	617	* INIT part
	618	*/
	619
	620	static int __init alsa_mpu401_uart_init(void)
	621	{
	622	return 0;
	623	}
	624
	625	static void __exit alsa_mpu401_uart_exit(void)
	626	{
	627	}
	628
	629	module_init(alsa_mpu401_uart_init)
	630	module_exit(alsa_mpu401_uart_exit)