uart = (snd_uart16550_t *)data;
	spin_lock_irqsave(&uart->open_lock, flags);
	snd_uart16550_del_timer(uart);
	snd_uart16550_io_loop(uart);
	spin_unlock_irqrestore(&uart->open_lock, flags);
}

/*
 *  this method probes, if an uart sits on given port
 *  return 0 if found
 *  return negative error if not found
 */
static int __init snd_uart16550_detect(snd_uart16550_t *uart)
{
	unsigned long io_base = uart->base;
	int ok;
	unsigned char c;

	/* Do some vague tests for the presence of the uart */
	if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
		return -ENODEV;	/* Not configured */
	}

	uart->res_base = request_region(io_base, 8, "Serial MIDI");
	if (uart->res_base == NULL) {
		snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
		return -EBUSY;
	}

	ok = 1;			/* uart detected unless one of the following tests should fail */
	/* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
	outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
	c = inb(io_base + UART_IER);
	/* The top four bits of the IER should always == 0 */
	if ((c & 0xf0) != 0)
		ok = 0;		/* failed */

	outb(0xaa, io_base + UART_SCR);
	/* Write arbitrary data into the scratch reg */
	c = inb(io_base + UART_SCR);
	/* If it comes back, it's OK */
	if (c != 0xaa)
		ok = 0;		/* failed */

	outb(0x55, io_base + UART_SCR);
	/* Write arbitrary data into the scratch reg */
	c = inb(io_base + UART_SCR);
	/* If it comes back, it's OK */
	if (c != 0x55)
		ok = 0;		/* failed */

	return ok;
}

static void snd_uart16550_do_open(snd_uart16550_t * uart)
{
	char byte;

	/* Initialize basic variables */
	uart->buff_in_count = 0;
	uart->buff_in = 0;
	uart->buff_out = 0;
	uart->fifo_limit = 1;
	uart->fifo_count = 0;
	uart->timer_running = 0;

	outb(UART_FCR_ENABLE_FIFO	/* Enable FIFO's (if available) */
	     | UART_FCR_CLEAR_RCVR	/* Clear receiver FIFO */
	     | UART_FCR_CLEAR_XMIT	/* Clear transmitter FIFO */
	     | UART_FCR_TRIGGER_4	/* Set FIFO trigger at 4-bytes */
	/* NOTE: interrupt generated after T=(time)4-bytes
	 * if less than UART_FCR_TRIGGER bytes received
	 */
	     ,uart->base + UART_FCR);	/* FIFO Control Register */

	if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
		uart->fifo_limit = 16;
	if (uart->divisor != 0) {
		uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
		outb(UART_LCR_DLAB	/* Divisor latch access bit */
		     ,uart->base + UART_LCR);	/* Line Control Register */
		uart->old_divisor_lsb = inb(uart->base + UART_DLL);
		uart->old_divisor_msb = inb(uart->base + UART_DLM);

		outb(uart->divisor
		     ,uart->base + UART_DLL);	/* Divisor Latch Low */
		outb(0
		     ,uart->base + UART_DLM);	/* Divisor Latch High */
		/* DLAB is reset to 0 in next outb() */
	}
	/* Set serial parameters (parity off, etc) */
	outb(UART_LCR_WLEN8	/* 8 data-bits */
	     | 0		/* 1 stop-bit */
	     | 0		/* parity off */
	     | 0		/* DLAB = 0 */
	     ,uart->base + UART_LCR);	/* Line Control Register */

	switch (uart->adaptor) {
	default:
		outb(UART_MCR_RTS	/* Set Request-To-Send line active */
		     | UART_MCR_DTR	/* Set Data-Terminal-Ready line active */
		     | UART_MCR_OUT2	/* Set OUT2 - not always required, but when
					 * it is, it is ESSENTIAL for enabling interrupts
				 */
		     ,uart->base + UART_MCR);	/* Modem Control Register */
		break;
	case SNDRV_SERIAL_MS124W_SA:
	case SNDRV_SERIAL_MS124W_MB:
		/* MS-124W can draw power from RTS and DTR if they
		   are in opposite states. */ 
		outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
		     uart->base + UART_MCR);
		break;
	case SNDRV_SERIAL_MS124T:
		/* MS-124T can draw power from RTS and/or DTR (preferably
		   both) if they are both asserted. */
		outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
		     uart->base + UART_MCR);
		break;
	}

	if (uart->irq < 0) {
		byte = (0 & UART_IER_RDI)	/* Disable Receiver data interrupt */
		    |(0 & UART_IER_THRI)	/* Disable Transmitter holding register empty interrupt */
		    ;
	} else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
		byte = UART_IER_RDI	/* Enable Receiver data interrupt */
		    | UART_IER_MSI	/* Enable Modem status interrupt */
		    ;
	} else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
		byte = UART_IER_RDI	/* Enable Receiver data interrupt */
		    | UART_IER_MSI	/* Enable Modem status interrupt */
		    | UART_IER_THRI	/* Enable Transmitter holding register empty interrupt */
		    ;
	} else {
		byte = UART_IER_RDI	/* Enable Receiver data interrupt */
		    | UART_IER_THRI	/* Enable Transmitter holding register empty interrupt */
		    ;
	}
	outb(byte, uart->base + UART_IER);	/* Interupt enable Register */

	inb(uart->base + UART_LSR);	/* Clear any pre-existing overrun indication */
	inb(uart->base + UART_IIR);	/* Clear any pre-existing transmit interrupt */
	inb(uart->base + UART_RX);	/* Clear any pre-existing receive interrupt */
}

static void snd_uart16550_do_close(snd_uart16550_t * uart)
{
	if (uart->irq < 0)
		snd_uart16550_del_timer(uart);

	/* NOTE: may need to disable interrupts before de-registering out handler.
	 * For now, the consequences are harmless.
	 */

	outb((0 & UART_IER_RDI)		/* Disable Receiver data interrupt */
	     |(0 & UART_IER_THRI)	/* Disable Transmitter holding register empty interrupt */
	     ,uart->base + UART_IER);	/* Interupt enable Register */

	switch (uart->adaptor) {
	default:
		outb((0 & UART_MCR_RTS)		/* Deactivate Request-To-Send line  */
		     |(0 & UART_MCR_DTR)	/* Deactivate Data-Terminal-Ready line */
		     |(0 & UART_MCR_OUT2)	/* Deactivate OUT2 */
		     ,uart->base + UART_MCR);	/* Modem Control Register */
	  break;
	case SNDRV_SERIAL_MS124W_SA:
	case SNDRV_SERIAL_MS124W_MB:
		/* MS-124W can draw power from RTS and DTR if they
		   are in opposite states; leave it powered. */ 
		outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2),
		     uart->base + UART_MCR);
		break;
	case SNDRV_SERIAL_MS124T:
		/* MS-124T can draw power from RTS and/or DTR (preferably
		   both) if they are both asserted; leave it powered. */
		outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2),
		     uart->base + UART_MCR);
		break;
	}

	inb(uart->base + UART_IIR);	/* Clear any outstanding interrupts */

	/* Restore old divisor */
	if (uart->divisor != 0) {
		outb(UART_LCR_DLAB		/* Divisor latch access bit */
		     ,uart->base + UART_LCR);	/* Line Control Register */
		outb(uart->old_divisor_lsb
		     ,uart->base + UART_DLL);	/* Divisor Latch Low */
		outb(uart->old_divisor_msb
		     ,uart->base + UART_DLM);	/* Divisor Latch High */
		/* Restore old LCR (data bits, stop bits, parity, DLAB) */
		outb(uart->old_line_ctrl_reg
		     ,uart->base + UART_LCR);	/* Line Control Register */
	}
}

static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream)
{
	unsigned long flags;
	snd_uart16550_t *uart = substream->rmidi->private_data;

	spin_lock_irqsave(&uart->open_lock, flags);
	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
		snd_uart16550_do_open(uart);
	uart->filemode |= SERIAL_MODE_INPUT_OPEN;
	uart->midi_input[substream->number] = substream;
	spin_unlock_irqrestore(&uart->open_lock, flags);
	return 0;
}

static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream)
{
	unsigned long flags;
	snd_uart16550_t *uart = substream->rmidi->private_data;

	spin_lock_irqsave(&uart->open_lock, flags);
	uart->filemode &= ~SERIAL_MODE_INPUT_OPEN;
	uart->midi_input[substream->number] = NULL;
	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
		snd_uart16550_do_close(uart);
	spin_unlock_irqrestore(&uart->open_lock, flags);
	return 0;
}

static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream, int up)
{
	unsigned long flags;
	snd_uart16550_t *uart = substream->rmidi->private_data;

	spin_lock_irqsave(&uart->open_lock, flags);
	if (up) {
		uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED;
	} else {
		uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED;
	}
	spin_unlock_irqrestore(&uart->open_lock, flags);
}

static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream)
{
	unsigned long flags;
	snd_uart16550_t *uart = substream->rmidi->private_data;

	spin_lock_irqsave(&uart->open_lock, flags);
	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
		snd_uart16550_do_open(uart);
	uart->filemode |= SERIAL_MODE_OUTPUT_OPEN;
	uart->midi_output[substream->number] = substream;
	spin_unlock_irqrestore(&uart->open_lock, flags);
	return 0;
};

static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream)
{
	unsigned long flags;
	snd_uart16550_t *uart = substream->rmidi->private_data;

	spin_lock_irqsave(&uart->open_lock, flags);
	uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN;
	uart->midi_output[substream->number] = NULL;
	if (uart->filemode == SERIAL_MODE_NOT_OPENED)
		snd_uart16550_do_close(uart);
	spin_unlock_irqrestore(&uart->open_lock, flags);
	return 0;
};

static inline int snd_uart16550_buffer_can_write( snd_uart16550_t *uart, int Num )
{
	if( uart->buff_in_count + Num < TX_BUFF_SIZE )
		return 1;
	else
		return 0;
}

static inline int snd_uart16550_write_buffer(snd_uart16550_t *uart, unsigned char byte)
{
	unsigned short buff_in = uart->buff_in;
	if( uart->buff_in_count < TX_BUFF_SIZE ) {
		uart->tx_buff[buff_in] = byte;
		buff_in++;
		buff_in &= TX_BUFF_MASK;
		uart->buff_in = buff_in;
		uart->buff_in_count++;
		if (uart->irq < 0) /* polling mode */
			snd_uart16550_add_timer(uart);
		return 1;
	} else
		return 0;
}

static int snd_uart16550_output_byte(snd_uart16550_t *uart, struct snd_rawmidi_substream *substream, unsigned char midi_byte)
{
	if (uart->buff_in_count == 0                            /* Buffer empty? */
	    && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA &&
	    uart->adaptor != SNDRV_SERIAL_GENERIC) ||
		(uart->fifo_count == 0                               /* FIFO empty? */
		 && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */

	        /* Tx Buffer Empty - try to write immediately */
		if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) {
		        /* Transmitter holding register (and Tx FIFO) empty */
		        uart->fifo_count = 1;
			outb(midi_byte, uart->base + UART_TX);
		} else {
		        if (uart->fifo_count < uart->fifo_limit) {
			        uart->fifo_count++;
				outb(midi_byte, uart->base + UART_TX);
			} else {
			        /* Cannot write (buffer empty) - put char in buffer */
				snd_uart16550_write_buffer(uart, midi_byte);
			}
		}
	} else {
		if( !snd_uart16550_write_buffer(uart, midi_byte) ) {
			snd_printk("%s: Buffer overrun on device at 0x%lx\n",
				   uart->rmidi->name, uart->base);
			return 0;
		}
	}

	return 1;
}

static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream)
{
	unsigned long flags;
	unsigned char midi_byte, addr_byte;
	snd_uart16550_t *uart = substream->rmidi->private_data;
	char first;
	static unsigned long lasttime=0;
	
	/* Interupts are disabled during the updating of the tx_buff,
	 * since it is 'bad' to have two processes updating the same
	 * variables (ie buff_in & buff_out)
	 */

	spin_lock_irqsave(&uart->open_lock, flags);

	if (uart->irq < 0)	//polling
		snd_uart16550_io_loop(uart);

	if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) {
		while (1) {
			/* buffer full? */
			/* in this mode we need two bytes of space */
			if (uart->buff_in_count > TX_BUFF_SIZE - 2)
				break;
			if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1)
				break;
#ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO
			/* select exactly one of the four ports */
			addr_byte = (1 << (substream->number + 4)) | 0x08;
#else
			/* select any combination of the four ports */
			addr_byte = (substream->number << 4) | 0x08;
			/* ...except none */
			if (addr_byte == 0x08) addr_byte = 0xf8;
#endif
			snd_uart16550_output_byte(uart, substream, addr_byte);
			/* send midi byte */
			snd_uart16550_output_byte(uart, substream, midi_byte);
		}
	} else {
		first = 0;
		while( 1 == snd_rawmidi_transmit_peek(substream, &midi_byte, 1) ) {
			/* Also send F5 after 3 seconds with no data to handle device disconnect */
			if (first == 0 && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS ||
				uart->adaptor == SNDRV_SERIAL_GENERIC) &&
			   (uart->prev_out != substream->number || jiffies-lasttime > 3*HZ)) {

				if( snd_uart16550_buffer_can_write( uart, 3 ) ) {
					/* Roland Soundcanvas part selection */
					/* If this substream of the data is different previous
					   substream in this uart, send the change part event */
					uart->prev_out = substream->number;
					/* change part */
					snd_uart16550_output_byte(uart, substream, 0xf5);
					/* data */
					snd_uart16550_output_byte(uart, substream, uart->prev_out + 1);
					/* If midi_byte is a data byte, send the previous status byte */
					if ((midi_byte < 0x80) && (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS))
						snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]);
				} else if( !uart->drop_on_full )
					break;

			}

			/* send midi byte */
			if( !snd_uart16550_output_byte(uart, substream, midi_byte) && !uart->drop_on_full )
				break;

			if (midi_byte >= 0x80 && midi_byte < 0xf0)
				uart->prev_status[uart->prev_out] = midi_byte;
			first = 1;

			snd_rawmidi_transmit_ack( substream, 1 );
		}
		lasttime = jiffies;
	}
	spin_unlock_irqrestore(&uart->open_lock, flags);
}

static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream, int up)
{
	unsigned long flags;
	snd_uart16550_t *uart = substream->rmidi->private_data;

	spin_lock_irqsave(&uart->open_lock, flags);
	if (up) {
		uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED;
	} else {
		uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED;
	}
	spin_unlock_irqrestore(&uart->open_lock, flags);
	if (up)
		snd_uart16550_output_write(substream);
}

static struct snd_rawmidi_ops snd_uart16550_output =
{
	.open =		snd_uart16550_output_open,
	.close =	snd_uart16550_output_close,
	.trigger =	snd_uart16550_output_trigger,
};

static struct snd_rawmidi_ops snd_uart16550_input =
{
	.open =		snd_uart16550_input_open,
	.close =	snd_uart16550_input_close,
	.trigger =	snd_uart16550_input_trigger,
};

static int snd_uart16550_free(snd_uart16550_t *uart)
{
	if (uart->irq >= 0)
		free_irq(uart->irq, (void *)uart);
	release_and_free_resource(uart->res_base);
	kfree(uart);
	return 0;
};

static int snd_uart16550_dev_free(struct snd_device *device)
{
	snd_uart16550_t *uart = device->device_data;
	return snd_uart16550_free(uart);
}

static int __init snd_uart16550_create(struct snd_card *card,
				       unsigned long iobase,
				       int irq,
				       unsigned int speed,
				       unsigned int base,
				       int adaptor,
				       int droponfull,
				       snd_uart16550_t **ruart)
{
	static struct snd_device_ops ops = {
		.dev_free =	snd_uart16550_dev_free,
	};
	snd_uart16550_t *uart;
	int err;


	if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL)
		return -ENOMEM;
	uart->adaptor = adaptor;
	uart->card = card;
	spin_lock_init(&uart->open_lock);
	uart->irq = -1;
	uart->base = iobase;
	uart->drop_on_full = droponfull;

	if ((err = snd_uart16550_detect(uart)) <= 0) {
		printk(KERN_ERR "no UART detected at 0x%lx\n", iobase);
		snd_uart16550_free(uart);
		return -ENODEV;
	}

	if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
		if (request_irq(irq, snd_uart16550_interrupt,
				IRQF_DISABLED, "Serial MIDI", (void *) uart)) {
			snd_printk("irq %d busy. Using Polling.\n", irq);
		} else {
			uart->irq = irq;
		}
	}
	uart->divisor = base / speed;
	uart->speed = base / (unsigned int)uart->divisor;
	uart->speed_base = base;
	uart->prev_out = -1;
	uart->prev_in = 0;
	uart->rstatus = 0;
	memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS);
	init_timer(&uart->buffer_timer);
	uart->buffer_timer.function = snd_uart16550_buffer_timer;
	uart->buffer_timer.data = (unsigned long)uart;
	uart->timer_running = 0;

	/* Register device */
	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) {
		snd_uart16550_free(uart);
		return err;
	}

	switch (uart->adaptor) {
	case SNDRV_SERIAL_MS124W_SA:
	case SNDRV_SERIAL_MS124W_MB:
		/* MS-124W can draw power from RTS and DTR if they
		   are in opposite states. */ 
		outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR);
		break;
	case SNDRV_SERIAL_MS124T:
		/* MS-124T can draw power from RTS and/or DTR (preferably
		   both) if they are asserted. */
		outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR);
		break;
	default:
		break;
	}

	if (ruart)
		*ruart = uart;

	return 0;
}

static void __init snd_uart16550_substreams(struct snd_rawmidi_str *stream)
{
	struct list_head *list;

	list_for_each(list, &stream->substreams) {
		struct snd_rawmidi_substream *substream = list_entry(list, struct snd_rawmidi_substream, list);
		sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
	}
}

static int __init snd_uart16550_rmidi(snd_uart16550_t *uart, int device, int outs, int ins, struct snd_rawmidi **rmidi)
{
	struct snd_rawmidi *rrawmidi;
	int err;

	if ((err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, outs, ins, &rrawmidi)) < 0)
		return err;
	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT, &snd_uart16550_input);
	snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &snd_uart16550_output);
	strcpy(rrawmidi->name, "Serial MIDI");
	snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
	snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
	rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
			       SNDRV_RAWMIDI_INFO_INPUT |
			       SNDRV_RAWMIDI_INFO_DUPLEX;
	rrawmidi->private_data = uart;
	if (rmidi)
		*rmidi = rrawmidi;
	return 0;
}

static int __init snd_serial_probe(struct platform_device *devptr)
{
	struct snd_card *card;
	snd_uart16550_t *uart;
	int err;
	int dev = devptr->id;

	switch (adaptor[dev]) {
	case SNDRV_SERIAL_SOUNDCANVAS:
		ins[dev] = 1;
		break;
	case SNDRV_SERIAL_MS124T:
	case SNDRV_SERIAL_MS124W_SA:
		outs[dev] = 1;
		ins[dev] = 1;
		break;
	case SNDRV_SERIAL_MS124W_MB:
		outs[dev] = 16;
		ins[dev] = 1;
		break;
	case SNDRV_SERIAL_GENERIC:
		break;
	default:
		snd_printk("Adaptor type is out of range 0-%d (%d)\n",
			   SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]);
		return -ENODEV;
	}

	if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) {
		snd_printk("Count of outputs is out of range 1-%d (%d)\n",
			   SNDRV_SERIAL_MAX_OUTS, outs[dev]);
		return -ENODEV;
	}

	if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) {
		snd_printk("Count of inputs is out of range 1-%d (%d)\n",
			   SNDRV_SERIAL_MAX_INS, ins[dev]);
		return -ENODEV;
	}

	card  = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
	if (card == NULL)
		return -ENOMEM;

	strcpy(card->driver, "Serial");
	strcpy(card->shortname, "Serial MIDI (UART16550A)");

	if ((err = snd_uart16550_create(card,
					port[dev],
					irq[dev],
					speed[dev],
					base[dev],
					adaptor[dev],
					droponfull[dev],
					&uart)) < 0)
		goto _err;

	if ((err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi)) < 0)
		goto _err;

	sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d ins %d adaptor %s droponfull %d",
		card->shortname,
		uart->base,
		uart->irq,
		uart->speed,
		(int)uart->divisor,
		outs[dev],
		ins[dev],
		adaptor_names[uart->adaptor],
		uart->drop_on_full);

	snd_card_set_dev(card, &devptr->dev);

	if ((err = snd_card_register(card)) < 0)
		goto _err;

	platform_set_drvdata(devptr, card);
	return 0;

 _err:
	snd_card_free(card);
	return err;
}

static int snd_serial_remove(struct platform_device *devptr)
{
	snd_card_free(platform_get_drvdata(devptr));
	platform_set_drvdata(devptr, NULL);
	return 0;
}

#define SND_SERIAL_DRIVER	"snd_serial_u16550"

static struct platform_driver snd_serial_driver = {
	.probe		= snd_serial_probe,
	.remove		= snd_serial_remove,
	.driver		= {
		.name	= SND_SERIAL_DRIVER
	},
};

static void __init_or_module snd_serial_unregister_all(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(devices); ++i)
		platform_device_unregister(devices[i]);
	platform_driver_unregister(&snd_serial_driver);
}

static int __init alsa_card_serial_init(void)
{
	int i, cards, err;

	if ((err = platform_driver_register(&snd_serial_driver)) < 0)
		return err;

	cards = 0;
	for (i = 0; i < SNDRV_CARDS; i++) {
		struct platform_device *device;
		if (! enable[i])
			continue;
		device = platform_device_register_simple(SND_SERIAL_DRIVER,
							 i, NULL, 0);
		if (IS_ERR(device))
			continue;
		if (!platform_get_drvdata(device)) {
			platform_device_unregister(device);
			continue;
		}
		devices[i] = device;
		cards++;
	}
	if (! cards) {
#ifdef MODULE
		printk(KERN_ERR "serial midi soundcard not found or device busy\n");
#endif
		snd_serial_unregister_all();
		return -ENODEV;
	}
	return 0;
}

static void __exit alsa_card_serial_exit(void)
{
	snd_serial_unregister_all();
}

module_init(alsa_card_serial_init)
module_exit(alsa_card_serial_exit)