sound/oss/uart401.c - kernel/msm-5.4 - Gitiles

 /*
  * sound/oss/uart401.c
  *
  * MPU-401 UART driver (formerly uart401_midi.c)
  *
  *
  * Copyright (C) by Hannu Savolainen 1993-1997
  *
  * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
  * Version 2 (June 1991). See the "COPYING" file distributed with this software
  * for more info.
  *
  * Changes:
  *	Alan Cox		Reformatted, removed sound_mem usage, use normal Linux
  *				interrupt allocation. Protect against bogus unload
  *				Fixed to allow IRQ > 15
  *	Christoph Hellwig	Adapted to module_init/module_exit
  *	Arnaldo C. de Melo	got rid of check_region
  *
  * Status:
  *		Untested
  */

 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include "sound_config.h"

 #include "mpu401.h"

 struct uart401_devc
 {
 	int             base;
 	int             irq;
 	int            *osp;
 	void            (*midi_input_intr) (int dev, unsigned char data);
 	int             opened, disabled;
 	volatile unsigned char input_byte;
 	int             my_dev;
 	int             share_irq;
 	spinlock_t	lock;
 };

 #define	DATAPORT   (devc->base)
 #define	COMDPORT   (devc->base+1)
 #define	STATPORT   (devc->base+1)

 static int uart401_status(struct uart401_devc *devc)
 {
 	return inb(STATPORT);
 }

 #define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))
 #define output_ready(devc)	(!(uart401_status(devc)&OUTPUT_READY))

 static void uart401_cmd(struct uart401_devc *devc, unsigned char cmd)
 {
 	outb((cmd), COMDPORT);
 }

 static int uart401_read(struct uart401_devc *devc)
 {
 	return inb(DATAPORT);
 }

 static void uart401_write(struct uart401_devc *devc, unsigned char byte)
 {
 	outb((byte), DATAPORT);
 }

 #define	OUTPUT_READY	0x40
 #define	INPUT_AVAIL	0x80
 #define	MPU_ACK		0xFE
 #define	MPU_RESET	0xFF
 #define	UART_MODE_ON	0x3F

 static int      reset_uart401(struct uart401_devc *devc);
 static void     enter_uart_mode(struct uart401_devc *devc);

 static void uart401_input_loop(struct uart401_devc *devc)
 {
 	int work_limit=30000;

 	while (input_avail(devc) && --work_limit)
 	{
 		unsigned char   c = uart401_read(devc);

 		if (c == MPU_ACK)
 			devc->input_byte = c;
 		else if (devc->opened & OPEN_READ && devc->midi_input_intr)
 			devc->midi_input_intr(devc->my_dev, c);
 	}
 	if(work_limit==0)
 		printk(KERN_WARNING "Too much work in interrupt on uart401 (0x%X). UART jabbering ??\n", devc->base);
 }

 irqreturn_t uart401intr(int irq, void *dev_id)
 {
 	struct uart401_devc *devc = dev_id;

 	if (devc == NULL)
 	{
 		printk(KERN_ERR "uart401: bad devc\n");
 		return IRQ_NONE;
 	}

 	if (input_avail(devc))
 		uart401_input_loop(devc);
 	return IRQ_HANDLED;
 }

 static int
 uart401_open(int dev, int mode,
 	     void            (*input) (int dev, unsigned char data),
 	     void            (*output) (int dev)
 )
 {
 	struct uart401_devc *devc = (struct uart401_devc *)
 				    midi_devs[dev]->devc;

 	if (devc->opened)
 		return -EBUSY;

 	/* Flush the UART */

 	while (input_avail(devc))
 		uart401_read(devc);

 	devc->midi_input_intr = input;
 	devc->opened = mode;
 	enter_uart_mode(devc);
 	devc->disabled = 0;

 	return 0;
 }

 static void uart401_close(int dev)
 {
 	struct uart401_devc *devc = (struct uart401_devc *)
 				    midi_devs[dev]->devc;

 	reset_uart401(devc);
 	devc->opened = 0;
 }

 static int uart401_out(int dev, unsigned char midi_byte)
 {
 	int timeout;
 	unsigned long flags;
 	struct uart401_devc *devc = (struct uart401_devc *)
 				    midi_devs[dev]->devc;

 	if (devc->disabled)
 		return 1;
 	/*
 	 * Test for input since pending input seems to block the output.
 	 */

 	spin_lock_irqsave(&devc->lock,flags);
 	if (input_avail(devc))
 		uart401_input_loop(devc);

 	spin_unlock_irqrestore(&devc->lock,flags);

 	/*
 	 * Sometimes it takes about 13000 loops before the output becomes ready
 	 * (After reset). Normally it takes just about 10 loops.
 	 */

 	for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);

 	if (!output_ready(devc))
 	{
 		  printk(KERN_WARNING "uart401: Timeout - Device not responding\n");
 		  devc->disabled = 1;
 		  reset_uart401(devc);
 		  enter_uart_mode(devc);
 		  return 1;
 	}
 	uart401_write(devc, midi_byte);
 	return 1;
 }

 static inline int uart401_start_read(int dev)
 {
 	return 0;
 }

 static inline int uart401_end_read(int dev)
 {
 	return 0;
 }

 static inline void uart401_kick(int dev)
 {
 }

 static inline int uart401_buffer_status(int dev)
 {
 	return 0;
 }

 #define MIDI_SYNTH_NAME	"MPU-401 UART"
 #define MIDI_SYNTH_CAPS	SYNTH_CAP_INPUT
 #include "midi_synth.h"

 static const struct midi_operations uart401_operations =
 {
 	.owner		= THIS_MODULE,
 	.info		= {"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401},
 	.converter	= &std_midi_synth,
 	.in_info	= {0},
 	.open		= uart401_open,
 	.close		= uart401_close,
 	.outputc	= uart401_out,
 	.start_read	= uart401_start_read,
 	.end_read	= uart401_end_read,
 	.kick		= uart401_kick,
 	.buffer_status	= uart401_buffer_status,
 };

 static void enter_uart_mode(struct uart401_devc *devc)
 {
 	int ok, timeout;
 	unsigned long flags;

 	spin_lock_irqsave(&devc->lock,flags);
 	for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);

 	devc->input_byte = 0;
 	uart401_cmd(devc, UART_MODE_ON);

 	ok = 0;
 	for (timeout = 50000; timeout > 0 && !ok; timeout--)
 		if (devc->input_byte == MPU_ACK)
 			ok = 1;
 		else if (input_avail(devc))
 			if (uart401_read(devc) == MPU_ACK)
 				ok = 1;

 	spin_unlock_irqrestore(&devc->lock,flags);
 }

 static int reset_uart401(struct uart401_devc *devc)
 {
 	int ok, timeout, n;

 	/*
 	 * Send the RESET command. Try again if no success at the first time.
 	 */

 	ok = 0;

 	for (n = 0; n < 2 && !ok; n++)
 	{
 		for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
 		devc->input_byte = 0;
 		uart401_cmd(devc, MPU_RESET);

 		/*
 		 * Wait at least 25 msec. This method is not accurate so let's make the
 		 * loop bit longer. Cannot sleep since this is called during boot.
 		 */

 		for (timeout = 50000; timeout > 0 && !ok; timeout--)
 		{
 			if (devc->input_byte == MPU_ACK)	/* Interrupt */
 				ok = 1;
 			else if (input_avail(devc))
 			{
 				if (uart401_read(devc) == MPU_ACK)
 					ok = 1;
 			}
 		}
 	}

 	/* Flush input before enabling interrupts */
 	if (ok)
 		uart401_input_loop(devc);
 	else
 		DDB(printk("Reset UART401 failed - No hardware detected.\n"));

 	return ok;
 }

 int probe_uart401(struct address_info *hw_config, struct module *owner)
 {
 	struct uart401_devc *devc;
 	char *name = "MPU-401 (UART) MIDI";
 	int ok = 0;
 	unsigned long flags;

 	DDB(printk("Entered probe_uart401()\n"));

 	/* Default to "not found" */
 	hw_config->slots[4] = -1;

 	if (!request_region(hw_config->io_base, 4, "MPU-401 UART")) {
 		printk(KERN_INFO "uart401: could not request_region(%d, 4)\n", hw_config->io_base);
 		return 0;
 	}

 	devc = kmalloc(sizeof(struct uart401_devc), GFP_KERNEL);
 	if (!devc) {
 		printk(KERN_WARNING "uart401: Can't allocate memory\n");
 		goto cleanup_region;
 	}

 	devc->base = hw_config->io_base;
 	devc->irq = hw_config->irq;
 	devc->osp = hw_config->osp;
 	devc->midi_input_intr = NULL;
 	devc->opened = 0;
 	devc->input_byte = 0;
 	devc->my_dev = 0;
 	devc->share_irq = 0;
 	spin_lock_init(&devc->lock);

 	spin_lock_irqsave(&devc->lock,flags);
 	ok = reset_uart401(devc);
 	spin_unlock_irqrestore(&devc->lock,flags);

 	if (!ok)
 		goto cleanup_devc;

 	if (hw_config->name)
 		name = hw_config->name;

 	if (devc->irq < 0) {
 		devc->share_irq = 1;
 		devc->irq *= -1;
 	} else
 		devc->share_irq = 0;

 	if (!devc->share_irq)
 		if (request_irq(devc->irq, uart401intr, 0, "MPU-401 UART", devc) < 0) {
 			printk(KERN_WARNING "uart401: Failed to allocate IRQ%d\n", devc->irq);
 			devc->share_irq = 1;
 		}
 	devc->my_dev = sound_alloc_mididev();
 	enter_uart_mode(devc);

 	if (devc->my_dev == -1) {
 		printk(KERN_INFO "uart401: Too many midi devices detected\n");
 		goto cleanup_irq;
 	}
 	conf_printf(name, hw_config);
 	midi_devs[devc->my_dev] = kmemdup(&uart401_operations,
 					  sizeof(struct midi_operations),
 					  GFP_KERNEL);
 	if (!midi_devs[devc->my_dev]) {
 		printk(KERN_ERR "uart401: Failed to allocate memory\n");
 		goto cleanup_unload_mididev;
 	}

 	if (owner)
 		midi_devs[devc->my_dev]->owner = owner;

 	midi_devs[devc->my_dev]->devc = devc;
 	midi_devs[devc->my_dev]->converter = kmemdup(&std_midi_synth,
 						     sizeof(struct synth_operations),
 						     GFP_KERNEL);

 	if (!midi_devs[devc->my_dev]->converter) {
 		printk(KERN_WARNING "uart401: Failed to allocate memory\n");
 		goto cleanup_midi_devs;
 	}
 	strcpy(midi_devs[devc->my_dev]->info.name, name);
 	midi_devs[devc->my_dev]->converter->id = "UART401";
 	midi_devs[devc->my_dev]->converter->midi_dev = devc->my_dev;

 	if (owner)
 		midi_devs[devc->my_dev]->converter->owner = owner;

 	hw_config->slots[4] = devc->my_dev;
 	sequencer_init();
 	devc->opened = 0;
 	return 1;
 cleanup_midi_devs:
 	kfree(midi_devs[devc->my_dev]);
 cleanup_unload_mididev:
 	sound_unload_mididev(devc->my_dev);
 cleanup_irq:
 	if (!devc->share_irq)
 		free_irq(devc->irq, devc);
 cleanup_devc:
 	kfree(devc);
 cleanup_region:
 	release_region(hw_config->io_base, 4);
 	return 0;
 }

 void unload_uart401(struct address_info *hw_config)
 {
 	struct uart401_devc *devc;
 	int n=hw_config->slots[4];

 	/* Not set up */
 	if(n==-1 || midi_devs[n]==NULL)
 		return;

 	/* Not allocated (erm ??) */

 	devc = midi_devs[hw_config->slots[4]]->devc;
 	if (devc == NULL)
 		return;

 	reset_uart401(devc);
 	release_region(hw_config->io_base, 4);

 	if (!devc->share_irq)
 		free_irq(devc->irq, devc);
 	if (devc)
 	{
 		kfree(midi_devs[devc->my_dev]->converter);
 		kfree(midi_devs[devc->my_dev]);
 		kfree(devc);
 		devc = NULL;
 	}
 	/* This kills midi_devs[x] */
 	sound_unload_mididev(hw_config->slots[4]);
 }

 EXPORT_SYMBOL(probe_uart401);
 EXPORT_SYMBOL(unload_uart401);
 EXPORT_SYMBOL(uart401intr);

 static struct address_info cfg_mpu;

 static int io = -1;
 static int irq = -1;

 module_param(io, int, 0444);
 module_param(irq, int, 0444);


 static int __init init_uart401(void)
 {
 	cfg_mpu.irq = irq;
 	cfg_mpu.io_base = io;

 	/* Can be loaded either for module use or to provide functions
 	   to others */
 	if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1) {
 		printk(KERN_INFO "MPU-401 UART driver Copyright (C) Hannu Savolainen 1993-1997");
 		if (!probe_uart401(&cfg_mpu, THIS_MODULE))
 			return -ENODEV;
 	}

 	return 0;
 }

 static void __exit cleanup_uart401(void)
 {
 	if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1)
 		unload_uart401(&cfg_mpu);
 }

 module_init(init_uart401);
 module_exit(cleanup_uart401);

 #ifndef MODULE
 static int __init setup_uart401(char *str)
 {
 	/* io, irq */
 	int ints[3];

 	str = get_options(str, ARRAY_SIZE(ints), ints);

 	io = ints[1];
 	irq = ints[2];

 	return 1;
 }

 __setup("uart401=", setup_uart401);
 #endif
 MODULE_LICENSE("GPL");
	/*
	* sound/oss/uart401.c
	*
	* MPU-401 UART driver (formerly uart401_midi.c)
	*
	*
	* Copyright (C) by Hannu Savolainen 1993-1997
	*
	* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
	* Version 2 (June 1991). See the "COPYING" file distributed with this software
	* for more info.
	*
	* Changes:
	* Alan Cox Reformatted, removed sound_mem usage, use normal Linux
	* interrupt allocation. Protect against bogus unload
	* Fixed to allow IRQ > 15
	* Christoph Hellwig Adapted to module_init/module_exit
	* Arnaldo C. de Melo got rid of check_region
	*
	* Status:
	* Untested
	*/

	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include "sound_config.h"

	#include "mpu401.h"

	struct uart401_devc
	{
	int base;
	int irq;
	int *osp;
	void (*midi_input_intr) (int dev, unsigned char data);
	int opened, disabled;
	volatile unsigned char input_byte;
	int my_dev;
	int share_irq;
	spinlock_t lock;
	};

	#define DATAPORT (devc->base)
	#define COMDPORT (devc->base+1)
	#define STATPORT (devc->base+1)

	static int uart401_status(struct uart401_devc *devc)
	{
	return inb(STATPORT);
	}

	#define input_avail(devc) (!(uart401_status(devc)&INPUT_AVAIL))
	#define output_ready(devc) (!(uart401_status(devc)&OUTPUT_READY))

	static void uart401_cmd(struct uart401_devc *devc, unsigned char cmd)
	{
	outb((cmd), COMDPORT);
	}

	static int uart401_read(struct uart401_devc *devc)
	{
	return inb(DATAPORT);
	}

	static void uart401_write(struct uart401_devc *devc, unsigned char byte)
	{
	outb((byte), DATAPORT);
	}

	#define OUTPUT_READY 0x40
	#define INPUT_AVAIL 0x80
	#define MPU_ACK 0xFE
	#define MPU_RESET 0xFF
	#define UART_MODE_ON 0x3F

	static int reset_uart401(struct uart401_devc *devc);
	static void enter_uart_mode(struct uart401_devc *devc);

	static void uart401_input_loop(struct uart401_devc *devc)
	{
	int work_limit=30000;

	while (input_avail(devc) && --work_limit)
	{
	unsigned char c = uart401_read(devc);

	if (c == MPU_ACK)
	devc->input_byte = c;
	else if (devc->opened & OPEN_READ && devc->midi_input_intr)
	devc->midi_input_intr(devc->my_dev, c);
	}
	if(work_limit==0)
	printk(KERN_WARNING "Too much work in interrupt on uart401 (0x%X). UART jabbering ??\n", devc->base);
	}

	irqreturn_t uart401intr(int irq, void *dev_id)
	{
	struct uart401_devc *devc = dev_id;

	if (devc == NULL)
	{
	printk(KERN_ERR "uart401: bad devc\n");
	return IRQ_NONE;
	}

	if (input_avail(devc))
	uart401_input_loop(devc);
	return IRQ_HANDLED;
	}

	static int
	uart401_open(int dev, int mode,
	void (*input) (int dev, unsigned char data),
	void (*output) (int dev)
	)
	{
	struct uart401_devc devc = (struct uart401_devc )
	midi_devs[dev]->devc;

	if (devc->opened)
	return -EBUSY;

	/* Flush the UART */

	while (input_avail(devc))
	uart401_read(devc);

	devc->midi_input_intr = input;
	devc->opened = mode;
	enter_uart_mode(devc);
	devc->disabled = 0;

	return 0;
	}

	static void uart401_close(int dev)
	{
	struct uart401_devc devc = (struct uart401_devc )
	midi_devs[dev]->devc;

	reset_uart401(devc);
	devc->opened = 0;
	}

	static int uart401_out(int dev, unsigned char midi_byte)
	{
	int timeout;
	unsigned long flags;
	struct uart401_devc devc = (struct uart401_devc )
	midi_devs[dev]->devc;

	if (devc->disabled)
	return 1;
	/*
	* Test for input since pending input seems to block the output.
	*/

	spin_lock_irqsave(&devc->lock,flags);
	if (input_avail(devc))
	uart401_input_loop(devc);

	spin_unlock_irqrestore(&devc->lock,flags);

	/*
	* Sometimes it takes about 13000 loops before the output becomes ready
	* (After reset). Normally it takes just about 10 loops.
	*/

	for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);

	if (!output_ready(devc))
	{
	printk(KERN_WARNING "uart401: Timeout - Device not responding\n");
	devc->disabled = 1;
	reset_uart401(devc);
	enter_uart_mode(devc);
	return 1;
	}
	uart401_write(devc, midi_byte);
	return 1;
	}

	static inline int uart401_start_read(int dev)
	{
	return 0;
	}

	static inline int uart401_end_read(int dev)
	{
	return 0;
	}

	static inline void uart401_kick(int dev)
	{
	}

	static inline int uart401_buffer_status(int dev)
	{
	return 0;
	}

	#define MIDI_SYNTH_NAME "MPU-401 UART"
	#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
	#include "midi_synth.h"

	static const struct midi_operations uart401_operations =
	{
	.owner = THIS_MODULE,
	.info = {"MPU-401 (UART) MIDI", 0, 0, SNDCARD_MPU401},
	.converter = &std_midi_synth,
	.in_info = {0},
	.open = uart401_open,
	.close = uart401_close,
	.outputc = uart401_out,
	.start_read = uart401_start_read,
	.end_read = uart401_end_read,
	.kick = uart401_kick,
	.buffer_status = uart401_buffer_status,
	};

	static void enter_uart_mode(struct uart401_devc *devc)
	{
	int ok, timeout;
	unsigned long flags;

	spin_lock_irqsave(&devc->lock,flags);
	for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);

	devc->input_byte = 0;
	uart401_cmd(devc, UART_MODE_ON);

	ok = 0;
	for (timeout = 50000; timeout > 0 && !ok; timeout--)
	if (devc->input_byte == MPU_ACK)
	ok = 1;
	else if (input_avail(devc))
	if (uart401_read(devc) == MPU_ACK)
	ok = 1;

	spin_unlock_irqrestore(&devc->lock,flags);
	}

	static int reset_uart401(struct uart401_devc *devc)
	{
	int ok, timeout, n;

	/*
	* Send the RESET command. Try again if no success at the first time.
	*/

	ok = 0;

	for (n = 0; n < 2 && !ok; n++)
	{
	for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
	devc->input_byte = 0;
	uart401_cmd(devc, MPU_RESET);

	/*
	* Wait at least 25 msec. This method is not accurate so let's make the
	* loop bit longer. Cannot sleep since this is called during boot.
	*/

	for (timeout = 50000; timeout > 0 && !ok; timeout--)
	{
	if (devc->input_byte == MPU_ACK) /* Interrupt */
	ok = 1;
	else if (input_avail(devc))
	{
	if (uart401_read(devc) == MPU_ACK)
	ok = 1;
	}
	}
	}

	/* Flush input before enabling interrupts */
	if (ok)
	uart401_input_loop(devc);
	else
	DDB(printk("Reset UART401 failed - No hardware detected.\n"));

	return ok;
	}

	int probe_uart401(struct address_info hw_config, struct module owner)
	{
	struct uart401_devc *devc;
	char *name = "MPU-401 (UART) MIDI";
	int ok = 0;
	unsigned long flags;

	DDB(printk("Entered probe_uart401()\n"));

	/* Default to "not found" */
	hw_config->slots[4] = -1;

	if (!request_region(hw_config->io_base, 4, "MPU-401 UART")) {
	printk(KERN_INFO "uart401: could not request_region(%d, 4)\n", hw_config->io_base);
	return 0;
	}

	devc = kmalloc(sizeof(struct uart401_devc), GFP_KERNEL);
	if (!devc) {
	printk(KERN_WARNING "uart401: Can't allocate memory\n");
	goto cleanup_region;
	}

	devc->base = hw_config->io_base;
	devc->irq = hw_config->irq;
	devc->osp = hw_config->osp;
	devc->midi_input_intr = NULL;
	devc->opened = 0;
	devc->input_byte = 0;
	devc->my_dev = 0;
	devc->share_irq = 0;
	spin_lock_init(&devc->lock);

	spin_lock_irqsave(&devc->lock,flags);
	ok = reset_uart401(devc);
	spin_unlock_irqrestore(&devc->lock,flags);

	if (!ok)
	goto cleanup_devc;

	if (hw_config->name)
	name = hw_config->name;

	if (devc->irq < 0) {
	devc->share_irq = 1;
	devc->irq *= -1;
	} else
	devc->share_irq = 0;

	if (!devc->share_irq)
	if (request_irq(devc->irq, uart401intr, 0, "MPU-401 UART", devc) < 0) {
	printk(KERN_WARNING "uart401: Failed to allocate IRQ%d\n", devc->irq);
	devc->share_irq = 1;
	}
	devc->my_dev = sound_alloc_mididev();
	enter_uart_mode(devc);

	if (devc->my_dev == -1) {
	printk(KERN_INFO "uart401: Too many midi devices detected\n");
	goto cleanup_irq;
	}
	conf_printf(name, hw_config);
	midi_devs[devc->my_dev] = kmemdup(&uart401_operations,
	sizeof(struct midi_operations),
	GFP_KERNEL);
	if (!midi_devs[devc->my_dev]) {
	printk(KERN_ERR "uart401: Failed to allocate memory\n");
	goto cleanup_unload_mididev;
	}

	if (owner)
	midi_devs[devc->my_dev]->owner = owner;

	midi_devs[devc->my_dev]->devc = devc;
	midi_devs[devc->my_dev]->converter = kmemdup(&std_midi_synth,
	sizeof(struct synth_operations),
	GFP_KERNEL);

	if (!midi_devs[devc->my_dev]->converter) {
	printk(KERN_WARNING "uart401: Failed to allocate memory\n");
	goto cleanup_midi_devs;
	}
	strcpy(midi_devs[devc->my_dev]->info.name, name);
	midi_devs[devc->my_dev]->converter->id = "UART401";
	midi_devs[devc->my_dev]->converter->midi_dev = devc->my_dev;

	if (owner)
	midi_devs[devc->my_dev]->converter->owner = owner;

	hw_config->slots[4] = devc->my_dev;
	sequencer_init();
	devc->opened = 0;
	return 1;
	cleanup_midi_devs:
	kfree(midi_devs[devc->my_dev]);
	cleanup_unload_mididev:
	sound_unload_mididev(devc->my_dev);
	cleanup_irq:
	if (!devc->share_irq)
	free_irq(devc->irq, devc);
	cleanup_devc:
	kfree(devc);
	cleanup_region:
	release_region(hw_config->io_base, 4);
	return 0;
	}

	void unload_uart401(struct address_info *hw_config)
	{
	struct uart401_devc *devc;
	int n=hw_config->slots[4];

	/* Not set up */
	if(n==-1 \|\| midi_devs[n]==NULL)
	return;

	/* Not allocated (erm ??) */

	devc = midi_devs[hw_config->slots[4]]->devc;
	if (devc == NULL)
	return;

	reset_uart401(devc);
	release_region(hw_config->io_base, 4);

	if (!devc->share_irq)
	free_irq(devc->irq, devc);
	if (devc)
	{
	kfree(midi_devs[devc->my_dev]->converter);
	kfree(midi_devs[devc->my_dev]);
	kfree(devc);
	devc = NULL;
	}
	/* This kills midi_devs[x] */
	sound_unload_mididev(hw_config->slots[4]);
	}

	EXPORT_SYMBOL(probe_uart401);
	EXPORT_SYMBOL(unload_uart401);
	EXPORT_SYMBOL(uart401intr);

	static struct address_info cfg_mpu;

	static int io = -1;
	static int irq = -1;

	module_param(io, int, 0444);
	module_param(irq, int, 0444);


	static int __init init_uart401(void)
	{
	cfg_mpu.irq = irq;
	cfg_mpu.io_base = io;

	/* Can be loaded either for module use or to provide functions
	to others */
	if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1) {
	printk(KERN_INFO "MPU-401 UART driver Copyright (C) Hannu Savolainen 1993-1997");
	if (!probe_uart401(&cfg_mpu, THIS_MODULE))
	return -ENODEV;
	}

	return 0;
	}

	static void __exit cleanup_uart401(void)
	{
	if (cfg_mpu.io_base != -1 && cfg_mpu.irq != -1)
	unload_uart401(&cfg_mpu);
	}

	module_init(init_uart401);
	module_exit(cleanup_uart401);

	#ifndef MODULE
	static int __init setup_uart401(char *str)
	{
	/* io, irq */
	int ints[3];

	str = get_options(str, ARRAY_SIZE(ints), ints);

	io = ints[1];
	irq = ints[2];

	return 1;
	}

	__setup("uart401=", setup_uart401);
	#endif
	MODULE_LICENSE("GPL");