wf_midi.c

iis s3c2410-uda1341语音系统的 开发

 
static void
wf_mpu_close (int dev)
{
	struct wf_mpu_config *devc;

	if (dev < 0 || dev >= num_midis || midi_devs[dev]==NULL)
		return;

	if (phys_dev->devno == dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return;
	}

	devc->mode = 0;
	devc->inputintr = NULL;
	devc->opened = 0;
}

static int
wf_mpu_out (int dev, unsigned char midi_byte)
{
	int             timeout;
	unsigned long   flags;
	static int lastoutdev = -1;
	unsigned char switchch;

	if (phys_dev->isvirtual && lastoutdev != dev) {
      
		if (dev == phys_dev->devno) { 
			switchch = WF_INTERNAL_SWITCH;
		} else if (dev == virt_dev->devno) { 
			switchch = WF_EXTERNAL_SWITCH;
		} else {
			printk (KERN_ERR "WF-MPU: bad device number %d", dev);
			return (0);
		}

		/* XXX fix me */
      
		for (timeout = 30000; timeout > 0 && !output_ready ();
		     timeout--);
      
		save_flags (flags);
		cli ();
      
		if (!output_ready ()) {
			printk (KERN_WARNING "WF-MPU: Send switch "
				"byte timeout\n");
			restore_flags (flags);
			return 0;
		}
      
		write_data (switchch);
		restore_flags (flags);
	} 

	lastoutdev = dev;

	/*
	 * Sometimes it takes about 30000 loops before the output becomes ready
	 * (After reset). Normally it takes just about 10 loops.
	 */

	/* XXX fix me */

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

	save_flags (flags);
	cli ();
	if (!output_ready ()) {
		printk (KERN_WARNING "WF-MPU: Send data timeout\n");
		restore_flags (flags);
		return 0;
	}

	write_data (midi_byte);
	restore_flags (flags);

	return 1;
}

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

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

static int wf_mpu_ioctl (int dev, unsigned cmd, caddr_t arg)
{
	printk (KERN_WARNING
		"WF-MPU: Intelligent mode not supported by hardware.\n");
	return -(EINVAL);
}

static int wf_mpu_buffer_status (int dev)
{
	return 0;
}

static struct synth_operations wf_mpu_synth_operations[2];
static struct midi_operations  wf_mpu_midi_operations[2];

static struct midi_operations wf_mpu_midi_proto =
{
	owner:		THIS_MODULE,
	info:		{"WF-MPU MIDI", 0, MIDI_CAP_MPU401, SNDCARD_MPU401},
	in_info:	{0},   /* in_info */
	open:		wf_mpu_open,
	close:		wf_mpu_close,
	ioctl:		wf_mpu_ioctl,
	outputc:	wf_mpu_out,
	start_read:	wf_mpu_start_read,
	end_read:	wf_mpu_end_read,
	buffer_status:	wf_mpu_buffer_status,
};

static struct synth_info wf_mpu_synth_info_proto =
{"WaveFront MPU-401 interface", 0,
 SYNTH_TYPE_MIDI, MIDI_TYPE_MPU401, 0, 128, 0, 128, SYNTH_CAP_INPUT};

static struct synth_info wf_mpu_synth_info[2];

static int
wf_mpu_synth_ioctl (int dev,
		    unsigned int cmd, caddr_t arg)
{
	int             midi_dev;
	int index;

	midi_dev = synth_devs[dev]->midi_dev;

	if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev]==NULL)
		return -(ENXIO);

	if (midi_dev == phys_dev->devno) {
		index = 0;
	} else if (phys_dev->isvirtual && midi_dev == virt_dev->devno) {
		index = 1;
	} else {
		return -(EINVAL);
	}

	switch (cmd) {

	case SNDCTL_SYNTH_INFO:
		if(copy_to_user (&((char *) arg)[0],
			      &wf_mpu_synth_info[index],
			      sizeof (struct synth_info)))
			return -EFAULT;
		return 0;
	
	case SNDCTL_SYNTH_MEMAVL:
		return 0x7fffffff;
	
	default:
		return -EINVAL;
	}
}

static int
wf_mpu_synth_open (int dev, int mode)
{
	int             midi_dev;
	struct wf_mpu_config *devc;

	midi_dev = synth_devs[dev]->midi_dev;

	if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev]==NULL) {
		return -(ENXIO);
	}
  
	if (phys_dev->devno == midi_dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == midi_dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return -(EINVAL);
	}

	if (devc->opened) {
		return -(EBUSY);
	}
  
	devc->mode = MODE_SYNTH;
	devc->synthno = dev;
	devc->opened = mode;
	devc->inputintr = NULL;
	return 0;
}

static void
wf_mpu_synth_close (int dev)
{
	int             midi_dev;
	struct wf_mpu_config *devc;

	midi_dev = synth_devs[dev]->midi_dev;

	if (phys_dev->devno == midi_dev) {
		devc = phys_dev;
	} else if (phys_dev->isvirtual && virt_dev->devno == midi_dev) {
		devc = virt_dev;
	} else {
		printk (KERN_ERR "WF-MPU: unknown device number %d\n", dev);
		return;
	}

	devc->inputintr = NULL;
	devc->opened = 0;
	devc->mode = 0;
}

#define _MIDI_SYNTH_C_
#define MIDI_SYNTH_NAME	"WaveFront (MIDI)"
#define MIDI_SYNTH_CAPS	SYNTH_CAP_INPUT
#include "midi_synth.h"

static struct synth_operations wf_mpu_synth_proto =
{
	owner:		THIS_MODULE,
	id:		"WaveFront (ICS2115)",
	info:		NULL,  /* info field, filled in during configuration */
	midi_dev:	0,     /* MIDI dev XXX should this be -1 ? */
	synth_type:	SYNTH_TYPE_MIDI,
	synth_subtype:	SAMPLE_TYPE_WAVEFRONT,
	open:		wf_mpu_synth_open,
	close:		wf_mpu_synth_close,
	ioctl:		wf_mpu_synth_ioctl,
	kill_note:	midi_synth_kill_note,
	start_note:	midi_synth_start_note,
	set_instr:	midi_synth_set_instr,
	reset:		midi_synth_reset,
	hw_control:	midi_synth_hw_control,
	load_patch:	midi_synth_load_patch,
	aftertouch:	midi_synth_aftertouch,
	controller:	midi_synth_controller,
	panning:	midi_synth_panning,
	bender:		midi_synth_bender,
	setup_voice:	midi_synth_setup_voice,
	send_sysex:	midi_synth_send_sysex
};

static int
config_wf_mpu (struct wf_mpu_config *dev)

{
	int is_external;
	char *name;
	int index;

	if (dev == phys_dev) {
		name = "WaveFront internal MIDI";
		is_external = 0;
		index = 0;
		memcpy ((char *) &wf_mpu_synth_operations[index],
			(char *) &wf_mpu_synth_proto,
			sizeof (struct synth_operations));
	} else {
		name = "WaveFront external MIDI";
		is_external = 1;
		index = 1;
		/* no synth operations for an external MIDI interface */
	}

	memcpy ((char *) &wf_mpu_synth_info[dev->devno],
		(char *) &wf_mpu_synth_info_proto,
		sizeof (struct synth_info));

	strcpy (wf_mpu_synth_info[index].name, name);

	wf_mpu_synth_operations[index].midi_dev = dev->devno;
	wf_mpu_synth_operations[index].info = &wf_mpu_synth_info[index];

	memcpy ((char *) &wf_mpu_midi_operations[index],
		(char *) &wf_mpu_midi_proto,
		sizeof (struct midi_operations));
  
	if (is_external) {
		wf_mpu_midi_operations[index].converter = NULL;
	} else {
		wf_mpu_midi_operations[index].converter =
			&wf_mpu_synth_operations[index];
	}

	strcpy (wf_mpu_midi_operations[index].info.name, name);

	midi_devs[dev->devno] = &wf_mpu_midi_operations[index];
	midi_devs[dev->devno]->in_info.m_busy = 0;
	midi_devs[dev->devno]->in_info.m_state = MST_INIT;
	midi_devs[dev->devno]->in_info.m_ptr = 0;
	midi_devs[dev->devno]->in_info.m_left = 0;
	midi_devs[dev->devno]->in_info.m_prev_status = 0;

	devs[index].opened = 0;
	devs[index].mode = 0;

	return (0);
}

int virtual_midi_enable (void)

{
	if ((virt_dev->devno < 0) &&
	    (virt_dev->devno = sound_alloc_mididev()) == -1) {
		printk (KERN_ERR
			"WF-MPU: too many midi devices detected\n");
		return -1;
	}

	config_wf_mpu (virt_dev);

	phys_dev->isvirtual = 1;
	return virt_dev->devno;
}

int
virtual_midi_disable (void)

{
	unsigned long flags;

	save_flags (flags);
	cli();

	wf_mpu_close (virt_dev->devno);
	/* no synth on virt_dev, so no need to call wf_mpu_synth_close() */
	phys_dev->isvirtual = 0;

	restore_flags (flags);

	return 0;
}

int __init detect_wf_mpu (int irq, int io_base)
{
	if (check_region (io_base, 2)) {
		printk (KERN_WARNING "WF-MPU: I/O port %x already in use.\n",
			io_base);
		return -1;
	}

	phys_dev->base = io_base;
	phys_dev->irq = irq;
	phys_dev->devno = -1;
	virt_dev->devno = -1;

	return 0;
}

int __init install_wf_mpu (void)
{
	if ((phys_dev->devno = sound_alloc_mididev()) < 0){

		printk (KERN_ERR "WF-MPU: Too many MIDI devices detected.\n");
		return -1;

	}

	request_region (phys_dev->base, 2, "wavefront midi");
	phys_dev->isvirtual = 0;

	if (config_wf_mpu (phys_dev)) {

		printk (KERN_WARNING
			"WF-MPU: configuration for MIDI device %d failed\n",
			phys_dev->devno);
		sound_unload_mididev (phys_dev->devno);

	}

	/* OK, now we're configured to handle an interrupt ... */

	if (request_irq (phys_dev->irq, wf_mpuintr, SA_INTERRUPT|SA_SHIRQ,
			 "wavefront midi", phys_dev) < 0) {

		printk (KERN_ERR "WF-MPU: Failed to allocate IRQ%d\n",
			phys_dev->irq);
		return -1;

	}

	/* This being a WaveFront (ICS-2115) emulated MPU-401, we have
	   to switch it into UART (dumb) mode, because otherwise, it
	   won't do anything at all.
	*/
  
	start_uart_mode ();

	return phys_dev->devno;
}
 
void
uninstall_wf_mpu (void)

{
	release_region (phys_dev->base, 2); 
	free_irq (phys_dev->irq, phys_dev);
	sound_unload_mididev (phys_dev->devno);

	if (virt_dev->devno >= 0) {
		sound_unload_mididev (virt_dev->devno);
	}
}

static void
start_uart_mode (void)

{
	int             ok, i;
	unsigned long   flags;

	save_flags (flags);
	cli ();

	/* XXX fix me */

	for (i = 0; i < 30000 && !output_ready (); i++);

	outb (UART_MODE_ON, COMDPORT(phys_dev));

	for (ok = 0, i = 50000; i > 0 && !ok; i--) {
		if (input_avail ()) {
			if (read_data () == MPU_ACK) {
				ok = 1;
			}
		}
	}

	restore_flags (flags);
}
#endif