Initial import

1 files changed, 477 insertions, 0 deletions

diff --git a/sound/oss/uart401.c b/sound/oss/uart401.c
new file mode 100644
index 000000000..dae4d4344
--- /dev/null
+++ b/sound/oss/uart401.c
@@ -0,0 +1,477 @@
+/*
+ * 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);
+	kfree(midi_devs[devc->my_dev]->converter);
+	kfree(midi_devs[devc->my_dev]);
+	kfree(devc);
+
+	/* 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");