opl3.c

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		/*
		 * Set Wave Select
		 */
		
		opl3_command(map->ioaddr, WAVE_SELECT + map->op[2], instr->operators[OFFS_4OP + 8]);
		opl3_command(map->ioaddr, WAVE_SELECT + map->op[3], instr->operators[OFFS_4OP + 9]);

		/*
		 * Set Feedback/Connection
		 */
		
		fpc = instr->operators[OFFS_4OP + 10];
		if (!(fpc & 0x30))
			 fpc |= 0x30;	/*
					 * Ensure that at least one chn is enabled
					 */
		opl3_command(map->ioaddr, FEEDBACK_CONNECTION + map->voice_num + 3, fpc);
	}

	devc->voc[voice].mode = voice_mode;
	set_voice_volume(voice, volume, devc->voc[voice].volume);

	freq = devc->voc[voice].orig_freq = note_to_freq(note) / 1000;

	/*
	 * Since the pitch bender may have been set before playing the note, we
	 * have to calculate the bending now.
	 */

	freq = compute_finetune(devc->voc[voice].orig_freq, devc->voc[voice].bender, devc->voc[voice].bender_range, 0);
	devc->voc[voice].current_freq = freq;

	freq_to_fnum(freq, &block, &fnum);

	/*
	 * Play note
	 */

	data = fnum & 0xff;	/*
				 * Least significant bits of fnumber
				 */
	opl3_command(map->ioaddr, FNUM_LOW + map->voice_num, data);

	data = 0x20 | ((block & 0x7) << 2) | ((fnum >> 8) & 0x3);
		 devc->voc[voice].keyon_byte = data;
	opl3_command(map->ioaddr, KEYON_BLOCK + map->voice_num, data);
	if (voice_mode == 4)
		opl3_command(map->ioaddr, KEYON_BLOCK + map->voice_num + 3, data);

	return 0;
}

static void freq_to_fnum    (int freq, int *block, int *fnum)
{
	int f, octave;

	/*
	 * Converts the note frequency to block and fnum values for the FM chip
	 */
	/*
	 * First try to compute the block -value (octave) where the note belongs
	 */

	f = freq;

	octave = 5;

	if (f == 0)
		octave = 0;
	else if (f < 261)
	{
		while (f < 261)
		{
			octave--;
			f <<= 1;
		}
	}
	else if (f > 493)
	{
		while (f > 493)
		{
			 octave++;
			 f >>= 1;
		}
	}

	if (octave > 7)
		octave = 7;

	*fnum = freq * (1 << (20 - octave)) / 49716;
	*block = octave;
}

static void opl3_command    (int io_addr, unsigned int addr, unsigned int val)
{
	 int i;

	/*
	 * The original 2-OP synth requires a quite long delay after writing to a
	 * register. The OPL-3 survives with just two INBs
	 */

	outb(((unsigned char) (addr & 0xff)), io_addr);

	if (devc->model != 2)
		udelay(10);
	else
		for (i = 0; i < 2; i++)
			inb(io_addr);

	outb(((unsigned char) (val & 0xff)), io_addr + 1);

	if (devc->model != 2)
		udelay(30);
	else
		for (i = 0; i < 2; i++)
			inb(io_addr);
}

static void opl3_reset(int devno)
{
	int i;

	for (i = 0; i < 18; i++)
		devc->lv_map[i] = i;

	for (i = 0; i < devc->nr_voice; i++)
	{
		opl3_command(pv_map[devc->lv_map[i]].ioaddr,
			KSL_LEVEL + pv_map[devc->lv_map[i]].op[0], 0xff);

		opl3_command(pv_map[devc->lv_map[i]].ioaddr,
			KSL_LEVEL + pv_map[devc->lv_map[i]].op[1], 0xff);

		if (pv_map[devc->lv_map[i]].voice_mode == 4)
		{
			opl3_command(pv_map[devc->lv_map[i]].ioaddr,
				KSL_LEVEL + pv_map[devc->lv_map[i]].op[2], 0xff);

			opl3_command(pv_map[devc->lv_map[i]].ioaddr,
				KSL_LEVEL + pv_map[devc->lv_map[i]].op[3], 0xff);
		}

		opl3_kill_note(devno, i, 0, 64);
	}

	if (devc->model == 2)
	{
		devc->v_alloc->max_voice = devc->nr_voice = 18;

		for (i = 0; i < 18; i++)
			pv_map[i].voice_mode = 2;

	}
}

static int opl3_open(int dev, int mode)
{
	int i;

	if (devc->busy)
		return -EBUSY;
	devc->busy = 1;

	devc->v_alloc->max_voice = devc->nr_voice = (devc->model == 2) ? 18 : 9;
	devc->v_alloc->timestamp = 0;

	for (i = 0; i < 18; i++)
	{
		devc->v_alloc->map[i] = 0;
		devc->v_alloc->alloc_times[i] = 0;
	}

	devc->cmask = 0x00;	/*
				 * Just 2 OP mode
				 */
	if (devc->model == 2)
		opl3_command(devc->right_io, CONNECTION_SELECT_REGISTER, devc->cmask);
	return 0;
}

static void opl3_close(int dev)
{
	devc->busy = 0;
	devc->v_alloc->max_voice = devc->nr_voice = (devc->model == 2) ? 18 : 9;

	devc->fm_info.nr_drums = 0;
	devc->fm_info.perc_mode = 0;

	opl3_reset(dev);
}

static void opl3_hw_control(int dev, unsigned char *event)
{
}

static int opl3_load_patch(int dev, int format, const char *addr,
		int offs, int count, int pmgr_flag)
{
	struct sbi_instrument ins;

	if (count <sizeof(ins))
	{
		printk(KERN_WARNING "FM Error: Patch record too short\n");
		return -EINVAL;
	}

	if(copy_from_user(&((char *) &ins)[offs], &(addr)[offs], sizeof(ins) - offs))
		return -EFAULT;

	if (ins.channel < 0 || ins.channel >= SBFM_MAXINSTR)
	{
		printk(KERN_WARNING "FM Error: Invalid instrument number %d\n", ins.channel);
		return -EINVAL;
	}
	ins.key = format;

	return store_instr(ins.channel, &ins);
}

static void opl3_panning(int dev, int voice, int value)
{
	devc->voc[voice].panning = value;
}

static void opl3_volume_method(int dev, int mode)
{
}

#define SET_VIBRATO(cell) { \
	tmp = instr->operators[(cell-1)+(((cell-1)/2)*OFFS_4OP)]; \
	if (pressure > 110) \
		tmp |= 0x40;		/* Vibrato on */ \
	opl3_command (map->ioaddr, AM_VIB + map->op[cell-1], tmp);}

static void opl3_aftertouch(int dev, int voice, int pressure)
{
	int tmp;
	struct sbi_instrument *instr;
	struct physical_voice_info *map;

	if (voice < 0 || voice >= devc->nr_voice)
		return;

	map = &pv_map[devc->lv_map[voice]];

	DEB(printk("Aftertouch %d\n", voice));

	if (map->voice_mode == 0)
		return;

	/*
	 * Adjust the amount of vibrato depending the pressure
	 */

	instr = devc->act_i[voice];

	if (!instr)
		instr = &devc->i_map[0];

	if (devc->voc[voice].mode == 4)
	{
		int connection = ((instr->operators[10] & 0x01) << 1) | (instr->operators[10 + OFFS_4OP] & 0x01);

		switch (connection)
		{
			case 0:
				SET_VIBRATO(4);
				break;

			case 1:
				SET_VIBRATO(2);
				SET_VIBRATO(4);
				break;

			case 2:
				SET_VIBRATO(1);
				SET_VIBRATO(4);
				break;

			case 3:
				SET_VIBRATO(1);
				SET_VIBRATO(3);
				SET_VIBRATO(4);
				break;

		}
		/*
		 * Not implemented yet
		 */
	}
	else
	{
		SET_VIBRATO(1);

		if ((instr->operators[10] & 0x01))	/*
							 * Additive synthesis
							 */
			SET_VIBRATO(2);
	}
}

#undef SET_VIBRATO

static void bend_pitch(int dev, int voice, int value)
{
	unsigned char data;
	int block, fnum, freq;
	struct physical_voice_info *map;

	map = &pv_map[devc->lv_map[voice]];

	if (map->voice_mode == 0)
		return;

	devc->voc[voice].bender = value;
	if (!value)
		return;
	if (!(devc->voc[voice].keyon_byte & 0x20))
		return;	/*
			 * Not keyed on
			 */

	freq = compute_finetune(devc->voc[voice].orig_freq, devc->voc[voice].bender, devc->voc[voice].bender_range, 0);
	devc->voc[voice].current_freq = freq;

	freq_to_fnum(freq, &block, &fnum);

	data = fnum & 0xff;	/*
				 * Least significant bits of fnumber
				 */
	opl3_command(map->ioaddr, FNUM_LOW + map->voice_num, data);

	data = 0x20 | ((block & 0x7) << 2) | ((fnum >> 8) & 0x3);
	devc->voc[voice].keyon_byte = data;
	opl3_command(map->ioaddr, KEYON_BLOCK + map->voice_num, data);
}

static void opl3_controller (int dev, int voice, int ctrl_num, int value)
{
	if (voice < 0 || voice >= devc->nr_voice)
		return;

	switch (ctrl_num)
	{
		case CTRL_PITCH_BENDER:
			bend_pitch(dev, voice, value);
			break;

		case CTRL_PITCH_BENDER_RANGE:
			devc->voc[voice].bender_range = value;
			break;

		case CTL_MAIN_VOLUME:
			devc->voc[voice].volume = value / 128;
			break;

		case CTL_PAN:
			devc->voc[voice].panning = (value * 2) - 128;
			break;
	}
}

static void opl3_bender(int dev, int voice, int value)
{
	if (voice < 0 || voice >= devc->nr_voice)
		return;

	bend_pitch(dev, voice, value - 8192);
}

static int opl3_alloc_voice(int dev, int chn, int note, struct voice_alloc_info *alloc)
{
	int i, p, best, first, avail, best_time = 0x7fffffff;
	struct sbi_instrument *instr;
	int is4op;
	int instr_no;

	if (chn < 0 || chn > 15)
		instr_no = 0;
	else
		instr_no = devc->chn_info[chn].pgm_num;

	instr = &devc->i_map[instr_no];
	if (instr->channel < 0 ||	/* Instrument not loaded */
		devc->nr_voice != 12)	/* Not in 4 OP mode */
		is4op = 0;
	else if (devc->nr_voice == 12)	/* 4 OP mode */
		is4op = (instr->key == OPL3_PATCH);
	else
		is4op = 0;

	if (is4op)
	{
		first = p = 0;
		avail = 6;
	}
	else
	{
		if (devc->nr_voice == 12)	/* 4 OP mode. Use the '2 OP only' operators first */
			first = p = 6;
		else
			first = p = 0;
		avail = devc->nr_voice;
	}

	/*
	 *    Now try to find a free voice
	 */
	best = first;

	for (i = 0; i < avail; i++)
	{
		if (alloc->map[p] == 0)
		{
			return p;
		}
		if (alloc->alloc_times[p] < best_time)		/* Find oldest playing note */
		{
			best_time = alloc->alloc_times[p];
			best = p;
		}
		p = (p + 1) % avail;
	}

	/*
	 *    Insert some kind of priority mechanism here.
	 */

	if (best < 0)
		best = 0;
	if (best > devc->nr_voice)
		best -= devc->nr_voice;

	return best;	/* All devc->voc in use. Select the first one. */
}

static void opl3_setup_voice(int dev, int voice, int chn)
{
	struct channel_info *info =
	&synth_devs[dev]->chn_info[chn];

	opl3_set_instr(dev, voice, info->pgm_num);

	devc->voc[voice].bender = 0;
	devc->voc[voice].bender_range = info->bender_range;
	devc->voc[voice].volume = info->controllers[CTL_MAIN_VOLUME];
	devc->voc[voice].panning = (info->controllers[CTL_PAN] * 2) - 128;
}

static struct synth_operations opl3_operations =
{
	owner:		THIS_MODULE,
	id:		"OPL",
	info:		NULL,
	midi_dev:	0,
	synth_type:	SYNTH_TYPE_FM,
	synth_subtype:	FM_TYPE_ADLIB,
	open:		opl3_open,
	close:		opl3_close,
	ioctl:		opl3_ioctl,
	kill_note:	opl3_kill_note,
	start_note:	opl3_start_note,
	set_instr:	opl3_set_instr,
	reset:		opl3_reset,
	hw_control:	opl3_hw_control,
	load_patch:	opl3_load_patch,
	aftertouch:	opl3_aftertouch,
	controller:	opl3_controller,
	panning:	opl3_panning,
	volume_method:	opl3_volume_method,
	bender:		opl3_bender,
	alloc_voice:	opl3_alloc_voice,
	setup_voice:	opl3_setup_voice
};

int opl3_init(int ioaddr, int *osp, struct module *owner)
{
	int i;
	int me;

	if (devc == NULL)
	{
		printk(KERN_ERR "opl3: Device control structure not initialized.\n");
		return -1;
	}

	if ((me = sound_alloc_synthdev()) == -1)
	{
		printk(KERN_WARNING "opl3: Too many synthesizers\n");
		return -1;
	}

	devc->nr_voice = 9;

	devc->fm_info.device = 0;
	devc->fm_info.synth_type = SYNTH_TYPE_FM;
	devc->fm_info.synth_subtype = FM_TYPE_ADLIB;
	devc->fm_info.perc_mode = 0;
	devc->fm_info.nr_voices = 9;
	devc->fm_info.nr_drums = 0;
	devc->fm_info.instr_bank_size = SBFM_MAXINSTR;
	devc->fm_info.capabilities = 0;
	devc->left_io = ioaddr;
	devc->right_io = ioaddr + 2;

	if (detected_model <= 2)
		devc->model = 1;
	else
	{
		devc->model = 2;
		if (detected_model == 4)
			devc->is_opl4 = 1;
	}

	opl3_operations.info = &devc->fm_info;

	synth_devs[me] = &opl3_operations;

	if (owner)
		synth_devs[me]->owner = owner;
	
	sequencer_init();
	devc->v_alloc = &opl3_operations.alloc;
	devc->chn_info = &opl3_operations.chn_info[0];

	if (devc->model == 2)
	{
		if (devc->is_opl4) 
			strcpy(devc->fm_info.name, "Yamaha OPL4/OPL3 FM");
		else 
			strcpy(devc->fm_info.name, "Yamaha OPL3");

		devc->v_alloc->max_voice = devc->nr_voice = 18;
		devc->fm_info.nr_drums = 0;
		devc->fm_info.synth_subtype = FM_TYPE_OPL3;
		devc->fm_info.capabilities |= SYNTH_CAP_OPL3;

		for (i = 0; i < 18; i++)
		{
			if (pv_map[i].ioaddr == USE_LEFT)
				pv_map[i].ioaddr = devc->left_io;
			else
				pv_map[i].ioaddr = devc->right_io;
		}
		opl3_command(devc->right_io, OPL3_MODE_REGISTER, OPL3_ENABLE);
		opl3_command(devc->right_io, CONNECTION_SELECT_REGISTER, 0x00);
	}
	else
	{
		strcpy(devc->fm_info.name, "Yamaha OPL2");
		devc->v_alloc->max_voice = devc->nr_voice = 9;
		devc->fm_info.nr_drums = 0;

		for (i = 0; i < 18; i++)
			pv_map[i].ioaddr = devc->left_io;
	};
	conf_printf2(devc->fm_info.name, ioaddr, 0, -1, -1);

	for (i = 0; i < SBFM_MAXINSTR; i++)
		devc->i_map[i].channel = -1;

	return me;
}

EXPORT_SYMBOL(opl3_init);
EXPORT_SYMBOL(opl3_detect);

static int me;

static int io = -1;

MODULE_PARM(io, "i");

static int __init init_opl3 (void)
{
	printk(KERN_INFO "YM3812 and OPL-3 driver Copyright (C) by Hannu Savolainen, Rob Hooft 1993-1996\n");

	if (io != -1)	/* User loading pure OPL3 module */
	{
		if (!opl3_detect(io, NULL))
		{
			return -ENODEV;
		}

		me = opl3_init(io, NULL, THIS_MODULE);
	}

	return 0;
}

static void __exit cleanup_opl3(void)
{
	if (devc && io != -1)
	{
		if (devc->base) {
			release_region(devc->base,4);
			if (devc->is_opl4)
				release_region(devc->base - 8, 2);
		}
		kfree(devc);
		devc = NULL;
		sound_unload_synthdev(me);
	}
}

module_init(init_opl3);
module_exit(cleanup_opl3);

#ifndef MODULE
static int __init setup_opl3(char *str)
{
        /* io  */
	int ints[2];
	
	str = get_options(str, ARRAY_SIZE(ints), ints);
	
	io = ints[1];

	return 1;
}

__setup("opl3=", setup_opl3);
#endif