[deliverable/linux.git] / sound / drivers / mpu401 / mpu401_uart.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 <asm/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.
 */
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 && !(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).
 *
 * 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,
			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)
Commit	Line	Data
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	3	* Routines for control of MPU-401 in UART mode
	4	*
	5	* MPU-401 supports UART mode which is not capable generate transmit
dba8b469	6	* interrupts thus output is done via polling. Without interrupt,
1da177e4 LT	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
1da177e4 LT	31	#include <asm/io.h>
	32	#include <linux/delay.h>
	33	#include <linux/init.h>
	34	#include <linux/slab.h>
	35	#include <linux/ioport.h>
da155d5b	36	#include <linux/module.h>
1da177e4 LT	37	#include <linux/interrupt.h>
	38	#include <linux/errno.h>
	39	#include <sound/core.h>
	40	#include <sound/mpu401.h>
	41
c1017a4c	42	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	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
b415ed45 TI	53	#define snd_mpu401_input_avail(mpu) \
	54	(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY))
	55	#define snd_mpu401_output_ready(mpu) \
	56	(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL))
1da177e4 LT	57
1da177e4 LT	58	/* Build in lowlevel io */
2851d963 TI	59	static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data,
2851d963 TI	60	unsigned long addr)
1da177e4 LT	61	{
	62	outb(data, addr);
	63	}
	64
2851d963 TI	65	static unsigned char mpu401_read_port(struct snd_mpu401 *mpu,
2851d963 TI	66	unsigned long addr)
1da177e4 LT	67	{
	68	return inb(addr);
	69	}
	70
2851d963 TI	71	static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data,
2851d963 TI	72	unsigned long addr)
1da177e4 LT	73	{
	74	writeb(data, (void __iomem *)addr);
	75	}
	76
2851d963 TI	77	static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu,
2851d963 TI	78	unsigned long addr)
1da177e4 LT	79	{
	80	return readb((void __iomem *)addr);
	81	}
	82	/* */
	83
e1fad17b	84	static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu)
1da177e4 LT	85	{
	86	int timeout = 100000;
	87	for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--)
	88	mpu->read(mpu, MPU401D(mpu));
	89	#ifdef CONFIG_SND_DEBUG
	90	if (timeout <= 0)
2851d963 TI	91	snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n",
2851d963 TI	92	mpu->read(mpu, MPU401C(mpu)));
1da177e4 LT	93	#endif
	94	}
	95
302e4c2f	96	static void uart_interrupt_tx(struct snd_mpu401 *mpu)
1da177e4	97	{
60fac85f CL	98	unsigned long flags;
60fac85f CL	99
1da177e4 LT	100	if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) &&
1da177e4 LT	101	test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) {
60fac85f	102	spin_lock_irqsave(&mpu->output_lock, flags);
1da177e4	103	snd_mpu401_uart_output_write(mpu);
60fac85f	104	spin_unlock_irqrestore(&mpu->output_lock, flags);
1da177e4 LT	105	}
	106	}
	107
302e4c2f TI	108	static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu)
302e4c2f TI	109	{
60fac85f CL	110	unsigned long flags;
60fac85f CL	111
302e4c2f	112	if (mpu->info_flags & MPU401_INFO_INPUT) {
60fac85f	113	spin_lock_irqsave(&mpu->input_lock, flags);
302e4c2f TI	114	if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
	115	snd_mpu401_uart_input_read(mpu);
	116	else
	117	snd_mpu401_uart_clear_rx(mpu);
60fac85f	118	spin_unlock_irqrestore(&mpu->input_lock, flags);
302e4c2f TI	119	}
	120	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
	121	/* ok. for better Tx performance try do some output
	122	when input is done */
	123	uart_interrupt_tx(mpu);
	124	}
	125
1da177e4 LT	126	/**
	127	* snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler
	128	* @irq: the irq number
	129	* @dev_id: mpu401 instance
1da177e4 LT	130	*
	131	* Processes the interrupt for MPU401-UART i/o.
	132	*/
7d12e780	133	irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
1da177e4	134	{
e1fad17b	135	struct snd_mpu401 *mpu = dev_id;
1da177e4 LT	136
	137	if (mpu == NULL)
	138	return IRQ_NONE;
	139	_snd_mpu401_uart_interrupt(mpu);
	140	return IRQ_HANDLED;
	141	}
	142
2851d963 TI	143	EXPORT_SYMBOL(snd_mpu401_uart_interrupt);
2851d963 TI	144
302e4c2f TI	145	/**
	146	* snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler
	147	* @irq: the irq number
	148	* @dev_id: mpu401 instance
302e4c2f TI	149	*
	150	* Processes the interrupt for MPU401-UART output.
	151	*/
7d12e780	152	irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
302e4c2f TI	153	{
	154	struct snd_mpu401 *mpu = dev_id;
	155
	156	if (mpu == NULL)
	157	return IRQ_NONE;
	158	uart_interrupt_tx(mpu);
	159	return IRQ_HANDLED;
	160	}
	161
	162	EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx);
	163
1da177e4 LT	164	/*
	165	* timer callback
	166	* reprogram the timer and call the interrupt job
	167	*/
	168	static void snd_mpu401_uart_timer(unsigned long data)
	169	{
e1fad17b	170	struct snd_mpu401 mpu = (struct snd_mpu401 )data;
b32425ac	171	unsigned long flags;
1da177e4	172
b32425ac	173	spin_lock_irqsave(&mpu->timer_lock, flags);
1da177e4 LT	174	/mpu->mode \|= MPU401_MODE_TIMER;/
	175	mpu->timer.expires = 1 + jiffies;
	176	add_timer(&mpu->timer);
b32425ac	177	spin_unlock_irqrestore(&mpu->timer_lock, flags);
1da177e4 LT	178	if (mpu->rmidi)
	179	_snd_mpu401_uart_interrupt(mpu);
	180	}
	181
	182	/*
	183	* initialize the timer callback if not programmed yet
	184	*/
e1fad17b	185	static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input)
1da177e4 LT	186	{
	187	unsigned long flags;
	188
	189	spin_lock_irqsave (&mpu->timer_lock, flags);
	190	if (mpu->timer_invoked == 0) {
	191	init_timer(&mpu->timer);
	192	mpu->timer.data = (unsigned long)mpu;
	193	mpu->timer.function = snd_mpu401_uart_timer;
	194	mpu->timer.expires = 1 + jiffies;
	195	add_timer(&mpu->timer);
	196	}
2851d963 TI	197	mpu->timer_invoked \|= input ? MPU401_MODE_INPUT_TIMER :
2851d963 TI	198	MPU401_MODE_OUTPUT_TIMER;
1da177e4 LT	199	spin_unlock_irqrestore (&mpu->timer_lock, flags);
	200	}
	201
	202	/*
	203	* remove the timer callback if still active
	204	*/
e1fad17b	205	static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input)
1da177e4 LT	206	{
	207	unsigned long flags;
	208
	209	spin_lock_irqsave (&mpu->timer_lock, flags);
	210	if (mpu->timer_invoked) {
2851d963 TI	211	mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER :
2851d963 TI	212	~MPU401_MODE_OUTPUT_TIMER;
1da177e4 LT	213	if (! mpu->timer_invoked)
	214	del_timer(&mpu->timer);
	215	}
	216	spin_unlock_irqrestore (&mpu->timer_lock, flags);
	217	}
	218
	219	/*
2851d963 TI	220	* send a UART command
2851d963 TI	221	* return zero if successful, non-zero for some errors
1da177e4 LT	222	*/
1da177e4 LT	223
962f831f	224	static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd,
2851d963	225	int ack)
1da177e4 LT	226	{
	227	unsigned long flags;
	228	int timeout, ok;
	229
	230	spin_lock_irqsave(&mpu->input_lock, flags);
	231	if (mpu->hardware != MPU401_HW_TRID4DWAVE) {
	232	mpu->write(mpu, 0x00, MPU401D(mpu));
	233	/snd_mpu401_uart_clear_rx(mpu);/
	234	}
	235	/* ok. standard MPU-401 initialization */
	236	if (mpu->hardware != MPU401_HW_SB) {
2851d963 TI	237	for (timeout = 1000; timeout > 0 &&
2851d963 TI	238	!snd_mpu401_output_ready(mpu); timeout--)
1da177e4 LT	239	udelay(10);
	240	#ifdef CONFIG_SND_DEBUG
	241	if (!timeout)
2851d963 TI	242	snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n",
2851d963 TI	243	mpu->read(mpu, MPU401C(mpu)));
1da177e4 LT	244	#endif
	245	}
	246	mpu->write(mpu, cmd, MPU401C(mpu));
df7e3fdf	247	if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) {
1da177e4 LT	248	ok = 0;
	249	timeout = 10000;
	250	while (!ok && timeout-- > 0) {
	251	if (snd_mpu401_input_avail(mpu)) {
	252	if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
	253	ok = 1;
	254	}
	255	}
	256	if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK)
	257	ok = 1;
2851d963	258	} else
1da177e4	259	ok = 1;
1da177e4	260	spin_unlock_irqrestore(&mpu->input_lock, flags);
962f831f	261	if (!ok) {
2851d963 TI	262	snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx "
	263	"(status = 0x%x, data = 0x%x)\n", cmd, mpu->port,
	264	mpu->read(mpu, MPU401C(mpu)),
	265	mpu->read(mpu, MPU401D(mpu)));
962f831f JM	266	return 1;
	267	}
	268	return 0;
1da177e4 LT	269	}
1da177e4 LT	270
8f7ba051 TI	271	static int snd_mpu401_do_reset(struct snd_mpu401 *mpu)
	272	{
	273	if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1))
	274	return -EIO;
c1099fcb	275	if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0))
8f7ba051 TI	276	return -EIO;
	277	return 0;
	278	}
	279
1da177e4 LT	280	/*
	281	* input/output open/close - protected by open_mutex in rawmidi.c
	282	*/
e1fad17b	283	static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream)
1da177e4	284	{
e1fad17b	285	struct snd_mpu401 *mpu;
1da177e4 LT	286	int err;
	287
	288	mpu = substream->rmidi->private_data;
	289	if (mpu->open_input && (err = mpu->open_input(mpu)) < 0)
	290	return err;
	291	if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) {
8f7ba051	292	if (snd_mpu401_do_reset(mpu) < 0)
962f831f	293	goto error_out;
1da177e4 LT	294	}
	295	mpu->substream_input = substream;
	296	set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
	297	return 0;
962f831f JM	298
	299	error_out:
	300	if (mpu->open_input && mpu->close_input)
	301	mpu->close_input(mpu);
	302	return -EIO;
1da177e4 LT	303	}
1da177e4 LT	304
e1fad17b	305	static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream)
1da177e4	306	{
e1fad17b	307	struct snd_mpu401 *mpu;
1da177e4 LT	308	int err;
	309
	310	mpu = substream->rmidi->private_data;
	311	if (mpu->open_output && (err = mpu->open_output(mpu)) < 0)
	312	return err;
	313	if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) {
8f7ba051	314	if (snd_mpu401_do_reset(mpu) < 0)
962f831f	315	goto error_out;
1da177e4 LT	316	}
	317	mpu->substream_output = substream;
	318	set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
	319	return 0;
962f831f JM	320
	321	error_out:
	322	if (mpu->open_output && mpu->close_output)
	323	mpu->close_output(mpu);
	324	return -EIO;
1da177e4 LT	325	}
1da177e4 LT	326
e1fad17b	327	static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream)
1da177e4	328	{
e1fad17b	329	struct snd_mpu401 *mpu;
962f831f	330	int err = 0;
1da177e4 LT	331
	332	mpu = substream->rmidi->private_data;
	333	clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode);
	334	mpu->substream_input = NULL;
	335	if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode))
962f831f	336	err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
1da177e4 LT	337	if (mpu->close_input)
1da177e4 LT	338	mpu->close_input(mpu);
962f831f JM	339	if (err)
962f831f JM	340	return -EIO;
1da177e4 LT	341	return 0;
	342	}
	343
e1fad17b	344	static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream)
1da177e4	345	{
e1fad17b	346	struct snd_mpu401 *mpu;
962f831f	347	int err = 0;
1da177e4 LT	348
	349	mpu = substream->rmidi->private_data;
	350	clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode);
	351	mpu->substream_output = NULL;
	352	if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode))
962f831f	353	err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0);
1da177e4 LT	354	if (mpu->close_output)
1da177e4 LT	355	mpu->close_output(mpu);
962f831f JM	356	if (err)
962f831f JM	357	return -EIO;
1da177e4 LT	358	return 0;
	359	}
	360
	361	/*
	362	* trigger input callback
	363	*/
2851d963 TI	364	static void
2851d963 TI	365	snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 LT	366	{
1da177e4 LT	367	unsigned long flags;
e1fad17b	368	struct snd_mpu401 *mpu;
1da177e4 LT	369	int max = 64;
	370
	371	mpu = substream->rmidi->private_data;
	372	if (up) {
2851d963 TI	373	if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER,
2851d963 TI	374	&mpu->mode)) {
1da177e4 LT	375	/* first time - flush FIFO */
	376	while (max-- > 0)
	377	mpu->read(mpu, MPU401D(mpu));
dba8b469	378	if (mpu->info_flags & MPU401_INFO_USE_TIMER)
1da177e4 LT	379	snd_mpu401_uart_add_timer(mpu, 1);
	380	}
	381
	382	/* read data in advance */
	383	spin_lock_irqsave(&mpu->input_lock, flags);
	384	snd_mpu401_uart_input_read(mpu);
	385	spin_unlock_irqrestore(&mpu->input_lock, flags);
	386	} else {
dba8b469	387	if (mpu->info_flags & MPU401_INFO_USE_TIMER)
1da177e4 LT	388	snd_mpu401_uart_remove_timer(mpu, 1);
	389	clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode);
	390	}
962f831f	391
1da177e4 LT	392	}
	393
	394	/*
	395	* transfer input pending data
	396	* call with input_lock spinlock held
	397	*/
e1fad17b	398	static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu)
1da177e4 LT	399	{
	400	int max = 128;
	401	unsigned char byte;
	402
	403	while (max-- > 0) {
2851d963	404	if (! snd_mpu401_input_avail(mpu))
1da177e4	405	break; /* input not available */
2851d963 TI	406	byte = mpu->read(mpu, MPU401D(mpu));
	407	if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode))
	408	snd_rawmidi_receive(mpu->substream_input, &byte, 1);
1da177e4 LT	409	}
	410	}
	411
	412	/*
	413	* Tx FIFO sizes:
	414	* CS4237B - 16 bytes
	415	* AudioDrive ES1688 - 12 bytes
	416	* S3 SonicVibes - 8 bytes
	417	* SoundBlaster AWE 64 - 2 bytes (ugly hardware)
	418	*/
	419
	420	/*
	421	* write output pending bytes
	422	* call with output_lock spinlock held
	423	*/
e1fad17b	424	static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu)
1da177e4 LT	425	{
1da177e4 LT	426	unsigned char byte;
ea6b5828	427	int max = 256;
1da177e4 LT	428
1da177e4 LT	429	do {
2851d963 TI	430	if (snd_rawmidi_transmit_peek(mpu->substream_output,
2851d963 TI	431	&byte, 1) == 1) {
ea6b5828 CL	432	/*
	433	* Try twice because there is hardware that insists on
	434	* setting the output busy bit after each write.
	435	*/
	436	if (!snd_mpu401_output_ready(mpu) &&
	437	!snd_mpu401_output_ready(mpu))
1da177e4	438	break; /* Tx FIFO full - try again later */
2851d963 TI	439	mpu->write(mpu, byte, MPU401D(mpu));
2851d963 TI	440	snd_rawmidi_transmit_ack(mpu->substream_output, 1);
1da177e4 LT	441	} else {
	442	snd_mpu401_uart_remove_timer (mpu, 0);
	443	break; /* no other data - leave the tx loop */
	444	}
	445	} while (--max > 0);
	446	}
	447
	448	/*
	449	* output trigger callback
	450	*/
2851d963 TI	451	static void
2851d963 TI	452	snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up)
1da177e4 LT	453	{
1da177e4 LT	454	unsigned long flags;
e1fad17b	455	struct snd_mpu401 *mpu;
1da177e4 LT	456
	457	mpu = substream->rmidi->private_data;
	458	if (up) {
	459	set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
	460
	461	/* try to add the timer at each output trigger,
	462	* since the output timer might have been removed in
	463	* snd_mpu401_uart_output_write().
	464	*/
302e4c2f TI	465	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
302e4c2f TI	466	snd_mpu401_uart_add_timer(mpu, 0);
1da177e4 LT	467
	468	/* output pending data */
	469	spin_lock_irqsave(&mpu->output_lock, flags);
	470	snd_mpu401_uart_output_write(mpu);
	471	spin_unlock_irqrestore(&mpu->output_lock, flags);
	472	} else {
302e4c2f TI	473	if (! (mpu->info_flags & MPU401_INFO_TX_IRQ))
302e4c2f TI	474	snd_mpu401_uart_remove_timer(mpu, 0);
1da177e4 LT	475	clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode);
	476	}
	477	}
	478
	479	/*
	480
	481	*/
	482
e1fad17b	483	static struct snd_rawmidi_ops snd_mpu401_uart_output =
1da177e4 LT	484	{
	485	.open = snd_mpu401_uart_output_open,
	486	.close = snd_mpu401_uart_output_close,
	487	.trigger = snd_mpu401_uart_output_trigger,
	488	};
	489
e1fad17b	490	static struct snd_rawmidi_ops snd_mpu401_uart_input =
1da177e4 LT	491	{
	492	.open = snd_mpu401_uart_input_open,
	493	.close = snd_mpu401_uart_input_close,
	494	.trigger = snd_mpu401_uart_input_trigger,
	495	};
	496
e1fad17b	497	static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi)
1da177e4	498	{
e1fad17b	499	struct snd_mpu401 *mpu = rmidi->private_data;
dba8b469	500	if (mpu->irq >= 0)
1da177e4	501	free_irq(mpu->irq, (void *) mpu);
b1d5776d	502	release_and_free_resource(mpu->res);
1da177e4 LT	503	kfree(mpu);
	504	}
	505
	506	/**
	507	* snd_mpu401_uart_new - create an MPU401-UART instance
	508	* @card: the card instance
	509	* @device: the device index, zero-based
	510	* @hardware: the hardware type, MPU401_HW_XXXX
	511	* @port: the base address of MPU401 port
302e4c2f	512	* @info_flags: bitflags MPU401_INFO_XXX
dba8b469	513	* @irq: the ISA irq number, -1 if not to be allocated
1da177e4 LT	514	* @rrawmidi: the pointer to store the new rawmidi instance
	515	*
	516	* Creates a new MPU-401 instance.
	517	*
	518	* Note that the rawmidi instance is returned on the rrawmidi argument,
	519	* not the mpu401 instance itself. To access to the mpu401 instance,
e1fad17b	520	* cast from rawmidi->private_data (with struct snd_mpu401 magic-cast).
1da177e4 LT	521	*
	522	* Returns zero if successful, or a negative error code.
	523	*/
e1fad17b	524	int snd_mpu401_uart_new(struct snd_card *card, int device,
1da177e4	525	unsigned short hardware,
302e4c2f TI	526	unsigned long port,
302e4c2f TI	527	unsigned int info_flags,
dba8b469	528	int irq,
e1fad17b	529	struct snd_rawmidi ** rrawmidi)
1da177e4	530	{
e1fad17b TI	531	struct snd_mpu401 *mpu;
e1fad17b TI	532	struct snd_rawmidi *rmidi;
302e4c2f	533	int in_enable, out_enable;
1da177e4 LT	534	int err;
	535
	536	if (rrawmidi)
	537	*rrawmidi = NULL;
302e4c2f TI	538	if (! (info_flags & (MPU401_INFO_INPUT \| MPU401_INFO_OUTPUT)))
	539	info_flags \|= MPU401_INFO_INPUT \| MPU401_INFO_OUTPUT;
	540	in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0;
	541	out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0;
	542	if ((err = snd_rawmidi_new(card, "MPU-401U", device,
	543	out_enable, in_enable, &rmidi)) < 0)
1da177e4	544	return err;
561b220a	545	mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
1da177e4	546	if (mpu == NULL) {
73e77ba0	547	snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n");
1da177e4 LT	548	snd_device_free(card, rmidi);
	549	return -ENOMEM;
	550	}
	551	rmidi->private_data = mpu;
	552	rmidi->private_free = snd_mpu401_uart_free;
	553	spin_lock_init(&mpu->input_lock);
	554	spin_lock_init(&mpu->output_lock);
	555	spin_lock_init(&mpu->timer_lock);
	556	mpu->hardware = hardware;
bc733d49	557	mpu->irq = -1;
302e4c2f	558	if (! (info_flags & MPU401_INFO_INTEGRATED)) {
1da177e4	559	int res_size = hardware == MPU401_HW_PC98II ? 4 : 2;
2851d963 TI	560	mpu->res = request_region(port, res_size, "MPU401 UART");
	561	if (mpu->res == NULL) {
	562	snd_printk(KERN_ERR "mpu401_uart: "
	563	"unable to grab port 0x%lx size %d\n",
	564	port, res_size);
1da177e4 LT	565	snd_device_free(card, rmidi);
	566	return -EBUSY;
	567	}
	568	}
302e4c2f	569	if (info_flags & MPU401_INFO_MMIO) {
1da177e4 LT	570	mpu->write = mpu401_write_mmio;
1da177e4 LT	571	mpu->read = mpu401_read_mmio;
302e4c2f	572	} else {
1da177e4 LT	573	mpu->write = mpu401_write_port;
1da177e4 LT	574	mpu->read = mpu401_read_port;
1da177e4 LT	575	}
	576	mpu->port = port;
	577	if (hardware == MPU401_HW_PC98II)
	578	mpu->cport = port + 2;
	579	else
	580	mpu->cport = port + 1;
dba8b469	581	if (irq >= 0) {
88e24c3a	582	if (request_irq(irq, snd_mpu401_uart_interrupt, 0,
2851d963 TI	583	"MPU401 UART", (void *) mpu)) {
	584	snd_printk(KERN_ERR "mpu401_uart: "
	585	"unable to grab IRQ %d\n", irq);
1da177e4 LT	586	snd_device_free(card, rmidi);
	587	return -EBUSY;
	588	}
	589	}
dba8b469 CL	590	if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK))
dba8b469 CL	591	info_flags \|= MPU401_INFO_USE_TIMER;
302e4c2f	592	mpu->info_flags = info_flags;
1da177e4	593	mpu->irq = irq;
1da177e4	594	if (card->shortname[0])
2851d963 TI	595	snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI",
2851d963 TI	596	card->shortname);
1da177e4	597	else
2851d963	598	sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device);
302e4c2f TI	599	if (out_enable) {
	600	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
	601	&snd_mpu401_uart_output);
	602	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_OUTPUT;
	603	}
	604	if (in_enable) {
	605	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
	606	&snd_mpu401_uart_input);
	607	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_INPUT;
	608	if (out_enable)
	609	rmidi->info_flags \|= SNDRV_RAWMIDI_INFO_DUPLEX;
	610	}
1da177e4 LT	611	mpu->rmidi = rmidi;
	612	if (rrawmidi)
	613	*rrawmidi = rmidi;
	614	return 0;
	615	}
	616
1da177e4 LT	617	EXPORT_SYMBOL(snd_mpu401_uart_new);
	618
	619	/*
	620	* INIT part
	621	*/
	622
	623	static int __init alsa_mpu401_uart_init(void)
	624	{
	625	return 0;
	626	}
	627
	628	static void __exit alsa_mpu401_uart_exit(void)
	629	{
	630	}
	631
	632	module_init(alsa_mpu401_uart_init)
	633	module_exit(alsa_mpu401_uart_exit)