sound/drivers/opl3/opl3_synth.c - android_kernel_htc_msm8960 - Gitiles

 /*
  *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
  *
  *  Routines for OPL2/OPL3/OPL4 control
  *
  *   This program is free software; you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
  *   the Free Software Foundation; either version 2 of the License, or
  *   (at your option) any later version.
  *
  *   This program is distributed in the hope that it will be useful,
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *   GNU General Public License for more details.
  *
  *   You should have received a copy of the GNU General Public License
  *   along with this program; if not, write to the Free Software
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  *
  */

 #include <sound/opl3.h>
 #include <sound/asound_fm.h>

 /*
  *    There is 18 possible 2 OP voices
  *      (9 in the left and 9 in the right).
  *      The first OP is the modulator and 2nd is the carrier.
  *
  *      The first three voices in the both sides may be connected
  *      with another voice to a 4 OP voice. For example voice 0
  *      can be connected with voice 3. The operators of voice 3 are
  *      used as operators 3 and 4 of the new 4 OP voice.
  *      In this case the 2 OP voice number 0 is the 'first half' and
  *      voice 3 is the second.
  */


 /*
  *    Register offset table for OPL2/3 voices,
  *    OPL2 / one OPL3 register array side only
  */

 char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
 {
 /*	  OP1   OP2   OP3   OP4		*/
 /*	 ------------------------	*/
 	{ 0x00, 0x03, 0x08, 0x0b },
 	{ 0x01, 0x04, 0x09, 0x0c },
 	{ 0x02, 0x05, 0x0a, 0x0d },

 	{ 0x08, 0x0b, 0x00, 0x00 },
 	{ 0x09, 0x0c, 0x00, 0x00 },
 	{ 0x0a, 0x0d, 0x00, 0x00 },

 	{ 0x10, 0x13, 0x00, 0x00 },	/* used by percussive voices */
 	{ 0x11, 0x14, 0x00, 0x00 },	/* if the percussive mode */
 	{ 0x12, 0x15, 0x00, 0x00 }	/* is selected (only left reg block) */
 };

 EXPORT_SYMBOL(snd_opl3_regmap);

 /*
  * prototypes
  */
 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);

 /* ------------------------------ */

 /*
  * open the device exclusively
  */
 int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
 {
 	return 0;
 }

 /*
  * ioctl for hwdep device:
  */
 int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
 		   unsigned int cmd, unsigned long arg)
 {
 	struct snd_opl3 *opl3 = hw->private_data;
 	void __user *argp = (void __user *)arg;

 	snd_assert(opl3 != NULL, return -EINVAL);

 	switch (cmd) {
 		/* get information */
 	case SNDRV_DM_FM_IOCTL_INFO:
 		{
 			struct snd_dm_fm_info info;

 			info.fm_mode = opl3->fm_mode;
 			info.rhythm = opl3->rhythm;
 			if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
 				return -EFAULT;
 			return 0;
 		}

 	case SNDRV_DM_FM_IOCTL_RESET:
 #ifdef CONFIG_SND_OSSEMUL
 	case SNDRV_DM_FM_OSS_IOCTL_RESET:
 #endif
 		snd_opl3_reset(opl3);
 		return 0;

 	case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
 #ifdef CONFIG_SND_OSSEMUL
 	case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
 #endif
 		{
 			struct snd_dm_fm_note note;
 			if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
 				return -EFAULT;
 			return snd_opl3_play_note(opl3, &note);
 		}

 	case SNDRV_DM_FM_IOCTL_SET_VOICE:
 #ifdef CONFIG_SND_OSSEMUL
 	case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
 #endif
 		{
 			struct snd_dm_fm_voice voice;
 			if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
 				return -EFAULT;
 			return snd_opl3_set_voice(opl3, &voice);
 		}

 	case SNDRV_DM_FM_IOCTL_SET_PARAMS:
 #ifdef CONFIG_SND_OSSEMUL
 	case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
 #endif
 		{
 			struct snd_dm_fm_params params;
 			if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
 				return -EFAULT;
 			return snd_opl3_set_params(opl3, &params);
 		}

 	case SNDRV_DM_FM_IOCTL_SET_MODE:
 #ifdef CONFIG_SND_OSSEMUL
 	case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
 #endif
 		return snd_opl3_set_mode(opl3, (int) arg);

 	case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
 #ifdef CONFIG_SND_OSSEMUL
 	case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
 #endif
 		return snd_opl3_set_connection(opl3, (int) arg);

 	case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
 		snd_opl3_clear_patches(opl3);
 		return 0;

 #ifdef CONFIG_SND_DEBUG
 	default:
 		snd_printk("unknown IOCTL: 0x%x\n", cmd);
 #endif
 	}
 	return -ENOTTY;
 }

 /*
  * close the device
  */
 int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
 {
 	struct snd_opl3 *opl3 = hw->private_data;

 	snd_opl3_reset(opl3);
 	return 0;
 }

 /*
  * write the device - load patches
  */
 long snd_opl3_write(struct snd_hwdep *hw, const char __user *buf, long count,
 		    loff_t *offset)
 {
 	struct snd_opl3 *opl3 = hw->private_data;
 	long result = 0;
 	int err = 0;
 	struct sbi_patch inst;

 	while (count >= sizeof(inst)) {
 		unsigned char type;
 		if (copy_from_user(&inst, buf, sizeof(inst)))
 			return -EFAULT;
 		if (!memcmp(inst.key, FM_KEY_SBI, 4) ||
 		    !memcmp(inst.key, FM_KEY_2OP, 4))
 			type = FM_PATCH_OPL2;
 		else if (!memcmp(inst.key, FM_KEY_4OP, 4))
 			type = FM_PATCH_OPL3;
 		else /* invalid type */
 			break;
 		err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
 					  inst.name, inst.extension,
 					  inst.data);
 		if (err < 0)
 			break;
 		result += sizeof(inst);
 		count -= sizeof(inst);
 	}
 	return result > 0 ? result : err;
 }


 /*
  * Patch management
  */

 /* offsets for SBI params */
 #define AM_VIB		0
 #define KSL_LEVEL	2
 #define ATTACK_DECAY	4
 #define SUSTAIN_RELEASE	6
 #define WAVE_SELECT	8

 /* offset for SBI instrument */
 #define CONNECTION	10
 #define OFFSET_4OP	11

 /*
  * load a patch, obviously.
  *
  * loaded on the given program and bank numbers with the given type
  * (FM_PATCH_OPLx).
  * data is the pointer of SBI record _without_ header (key and name).
  * name is the name string of the patch.
  * ext is the extension data of 7 bytes long (stored in name of SBI
  * data up to offset 25), or NULL to skip.
  * return 0 if successful or a negative error code.
  */
 int snd_opl3_load_patch(struct snd_opl3 *opl3,
 			int prog, int bank, int type,
 			const char *name,
 			const unsigned char *ext,
 			const unsigned char *data)
 {
 	struct fm_patch *patch;
 	int i;

 	patch = snd_opl3_find_patch(opl3, prog, bank, 1);
 	if (!patch)
 		return -ENOMEM;

 	patch->type = type;

 	for (i = 0; i < 2; i++) {
 		patch->inst.op[i].am_vib = data[AM_VIB + i];
 		patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
 		patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
 		patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
 		patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
 	}
 	patch->inst.feedback_connection[0] = data[CONNECTION];

 	if (type == FM_PATCH_OPL3) {
 		for (i = 0; i < 2; i++) {
 			patch->inst.op[i+2].am_vib =
 				data[OFFSET_4OP + AM_VIB + i];
 			patch->inst.op[i+2].ksl_level =
 				data[OFFSET_4OP + KSL_LEVEL + i];
 			patch->inst.op[i+2].attack_decay =
 				data[OFFSET_4OP + ATTACK_DECAY + i];
 			patch->inst.op[i+2].sustain_release =
 				data[OFFSET_4OP + SUSTAIN_RELEASE + i];
 			patch->inst.op[i+2].wave_select =
 				data[OFFSET_4OP + WAVE_SELECT + i];
 		}
 		patch->inst.feedback_connection[1] =
 			data[OFFSET_4OP + CONNECTION];
 	}

 	if (ext) {
 		patch->inst.echo_delay = ext[0];
 		patch->inst.echo_atten = ext[1];
 		patch->inst.chorus_spread = ext[2];
 		patch->inst.trnsps = ext[3];
 		patch->inst.fix_dur = ext[4];
 		patch->inst.modes = ext[5];
 		patch->inst.fix_key = ext[6];
 	}

 	if (name)
 		strlcpy(patch->name, name, sizeof(patch->name));

 	return 0;
 }
 EXPORT_SYMBOL(snd_opl3_load_patch);

 /*
  * find a patch with the given program and bank numbers, returns its pointer
  * if no matching patch is found and create_patch is set, it creates a
  * new patch object.
  */
 struct fm_patch *snd_opl3_find_patch(struct snd_opl3 *opl3, int prog, int bank,
 				     int create_patch)
 {
 	/* pretty dumb hash key */
 	unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
 	struct fm_patch *patch;

 	for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
 		if (patch->prog == prog && patch->bank == bank)
 			return patch;
 	}
 	if (!create_patch)
 		return NULL;

 	patch = kzalloc(sizeof(*patch), GFP_KERNEL);
 	if (!patch)
 		return NULL;
 	patch->prog = prog;
 	patch->bank = bank;
 	patch->next = opl3->patch_table[key];
 	opl3->patch_table[key] = patch;
 	return patch;
 }
 EXPORT_SYMBOL(snd_opl3_find_patch);

 /*
  * Clear all patches of the given OPL3 instance
  */
 void snd_opl3_clear_patches(struct snd_opl3 *opl3)
 {
 	int i;
 	for (i = 0; i <  OPL3_PATCH_HASH_SIZE; i++) {
 		struct fm_patch *patch, *next;
 		for (patch = opl3->patch_table[i]; patch; patch = next) {
 			next = patch->next;
 			kfree(patch);
 		}
 	}
 	memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
 }

 /* ------------------------------ */

 void snd_opl3_reset(struct snd_opl3 * opl3)
 {
 	unsigned short opl3_reg;

 	unsigned short reg_side;
 	unsigned char voice_offset;

 	int max_voices, i;

 	max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
 		MAX_OPL2_VOICES : MAX_OPL3_VOICES;

 	for (i = 0; i < max_voices; i++) {
 		/* Get register array side and offset of voice */
 		if (i < MAX_OPL2_VOICES) {
 			/* Left register block for voices 0 .. 8 */
 			reg_side = OPL3_LEFT;
 			voice_offset = i;
 		} else {
 			/* Right register block for voices 9 .. 17 */
 			reg_side = OPL3_RIGHT;
 			voice_offset = i - MAX_OPL2_VOICES;
 		}
 		opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
 		opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
 		opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
 		opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */

 		opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 		opl3->command(opl3, opl3_reg, 0x00);	/* Note off */
 	}

 	opl3->max_voices = MAX_OPL2_VOICES;
 	opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;

 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, 0x00);	/* Melodic mode */
 	opl3->rhythm = 0;
 }

 EXPORT_SYMBOL(snd_opl3_reset);

 static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
 {
 	unsigned short reg_side;
 	unsigned char voice_offset;

 	unsigned short opl3_reg;
 	unsigned char reg_val;

 	/* Voices 0 -  8 in OPL2 mode */
 	/* Voices 0 - 17 in OPL3 mode */
 	if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 			    MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 		return -EINVAL;

 	/* Get register array side and offset of voice */
 	if (note->voice < MAX_OPL2_VOICES) {
 		/* Left register block for voices 0 .. 8 */
 		reg_side = OPL3_LEFT;
 		voice_offset = note->voice;
 	} else {
 		/* Right register block for voices 9 .. 17 */
 		reg_side = OPL3_RIGHT;
 		voice_offset = note->voice - MAX_OPL2_VOICES;
 	}

 	/* Set lower 8 bits of note frequency */
 	reg_val = (unsigned char) note->fnum;
 	opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	reg_val = 0x00;
 	/* Set output sound flag */
 	if (note->key_on)
 		reg_val |= OPL3_KEYON_BIT;
 	/* Set octave */
 	reg_val |= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
 	/* Set higher 2 bits of note frequency */
 	reg_val |= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;

 	/* Set OPL3 KEYON_BLOCK register of requested voice */
 	opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	return 0;
 }


 static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
 {
 	unsigned short reg_side;
 	unsigned char op_offset;
 	unsigned char voice_offset;

 	unsigned short opl3_reg;
 	unsigned char reg_val;

 	/* Only operators 1 and 2 */
 	if (voice->op > 1)
 		return -EINVAL;
 	/* Voices 0 -  8 in OPL2 mode */
 	/* Voices 0 - 17 in OPL3 mode */
 	if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
 			     MAX_OPL3_VOICES : MAX_OPL2_VOICES))
 		return -EINVAL;

 	/* Get register array side and offset of voice */
 	if (voice->voice < MAX_OPL2_VOICES) {
 		/* Left register block for voices 0 .. 8 */
 		reg_side = OPL3_LEFT;
 		voice_offset = voice->voice;
 	} else {
 		/* Right register block for voices 9 .. 17 */
 		reg_side = OPL3_RIGHT;
 		voice_offset = voice->voice - MAX_OPL2_VOICES;
 	}
 	/* Get register offset of operator */
 	op_offset = snd_opl3_regmap[voice_offset][voice->op];

 	reg_val = 0x00;
 	/* Set amplitude modulation (tremolo) effect */
 	if (voice->am)
 		reg_val |= OPL3_TREMOLO_ON;
 	/* Set vibrato effect */
 	if (voice->vibrato)
 		reg_val |= OPL3_VIBRATO_ON;
 	/* Set sustaining sound phase */
 	if (voice->do_sustain)
 		reg_val |= OPL3_SUSTAIN_ON;
 	/* Set keyboard scaling bit */
 	if (voice->kbd_scale)
 		reg_val |= OPL3_KSR;
 	/* Set harmonic or frequency multiplier */
 	reg_val |= voice->harmonic & OPL3_MULTIPLE_MASK;

 	/* Set OPL3 AM_VIB register of requested voice/operator */
 	opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	/* Set decreasing volume of higher notes */
 	reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
 	/* Set output volume */
 	reg_val |= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;

 	/* Set OPL3 KSL_LEVEL register of requested voice/operator */
 	opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	/* Set attack phase level */
 	reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
 	/* Set decay phase level */
 	reg_val |= voice->decay & OPL3_DECAY_MASK;

 	/* Set OPL3 ATTACK_DECAY register of requested voice/operator */
 	opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	/* Set sustain phase level */
 	reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
 	/* Set release phase level */
 	reg_val |= voice->release & OPL3_RELEASE_MASK;

 	/* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
 	opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	/* Set inter-operator feedback */
 	reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
 	/* Set inter-operator connection */
 	if (voice->connection)
 		reg_val |= OPL3_CONNECTION_BIT;
 	/* OPL-3 only */
 	if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
 		if (voice->left)
 			reg_val |= OPL3_VOICE_TO_LEFT;
 		if (voice->right)
 			reg_val |= OPL3_VOICE_TO_RIGHT;
 	}
 	/* Feedback/connection bits are applicable to voice */
 	opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	/* Select waveform */
 	reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
 	opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
 	opl3->command(opl3, opl3_reg, reg_val);

 	return 0;
 }

 static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
 {
 	unsigned char reg_val;

 	reg_val = 0x00;
 	/* Set keyboard split method */
 	if (params->kbd_split)
 		reg_val |= OPL3_KEYBOARD_SPLIT;
 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_KBD_SPLIT, reg_val);

 	reg_val = 0x00;
 	/* Set amplitude modulation (tremolo) depth */
 	if (params->am_depth)
 		reg_val |= OPL3_TREMOLO_DEPTH;
 	/* Set vibrato depth */
 	if (params->vib_depth)
 		reg_val |= OPL3_VIBRATO_DEPTH;
 	/* Set percussion mode */
 	if (params->rhythm) {
 		reg_val |= OPL3_PERCUSSION_ENABLE;
 		opl3->rhythm = 1;
 	} else {
 		opl3->rhythm = 0;
 	}
 	/* Play percussion instruments */
 	if (params->bass)
 		reg_val |= OPL3_BASSDRUM_ON;
 	if (params->snare)
 		reg_val |= OPL3_SNAREDRUM_ON;
 	if (params->tomtom)
 		reg_val |= OPL3_TOMTOM_ON;
 	if (params->cymbal)
 		reg_val |= OPL3_CYMBAL_ON;
 	if (params->hihat)
 		reg_val |= OPL3_HIHAT_ON;

 	opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION, reg_val);
 	return 0;
 }

 static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
 {
 	if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
 		return -EINVAL;

 	opl3->fm_mode = mode;
 	if (opl3->hardware >= OPL3_HW_OPL3)
 		opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, 0x00);	/* Clear 4-op connections */

 	return 0;
 }

 static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
 {
 	unsigned char reg_val;

 	/* OPL-3 only */
 	if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
 		return -EINVAL;

 	reg_val = connection & (OPL3_RIGHT_4OP_0 | OPL3_RIGHT_4OP_1 | OPL3_RIGHT_4OP_2 |
 				OPL3_LEFT_4OP_0 | OPL3_LEFT_4OP_1 | OPL3_LEFT_4OP_2);
 	/* Set 4-op connections */
 	opl3->command(opl3, OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT, reg_val);

 	return 0;
 }
	/*
	* Copyright (c) by Uros Bizjak <uros@kss-loka.si>
	*
	* Routines for OPL2/OPL3/OPL4 control
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*
	*/

	#include <sound/opl3.h>
	#include <sound/asound_fm.h>

	/*
	* There is 18 possible 2 OP voices
	* (9 in the left and 9 in the right).
	* The first OP is the modulator and 2nd is the carrier.
	*
	* The first three voices in the both sides may be connected
	* with another voice to a 4 OP voice. For example voice 0
	* can be connected with voice 3. The operators of voice 3 are
	* used as operators 3 and 4 of the new 4 OP voice.
	* In this case the 2 OP voice number 0 is the 'first half' and
	* voice 3 is the second.
	*/


	/*
	* Register offset table for OPL2/3 voices,
	* OPL2 / one OPL3 register array side only
	*/

	char snd_opl3_regmap[MAX_OPL2_VOICES][4] =
	{
	/* OP1 OP2 OP3 OP4 */
	/* ------------------------ */
	{ 0x00, 0x03, 0x08, 0x0b },
	{ 0x01, 0x04, 0x09, 0x0c },
	{ 0x02, 0x05, 0x0a, 0x0d },

	{ 0x08, 0x0b, 0x00, 0x00 },
	{ 0x09, 0x0c, 0x00, 0x00 },
	{ 0x0a, 0x0d, 0x00, 0x00 },

	{ 0x10, 0x13, 0x00, 0x00 }, /* used by percussive voices */
	{ 0x11, 0x14, 0x00, 0x00 }, /* if the percussive mode */
	{ 0x12, 0x15, 0x00, 0x00 } /* is selected (only left reg block) */
	};

	EXPORT_SYMBOL(snd_opl3_regmap);

	/*
	* prototypes
	*/
	static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note);
	static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice);
	static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params);
	static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode);
	static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection);

	/* ------------------------------ */

	/*
	* open the device exclusively
	*/
	int snd_opl3_open(struct snd_hwdep * hw, struct file *file)
	{
	return 0;
	}

	/*
	* ioctl for hwdep device:
	*/
	int snd_opl3_ioctl(struct snd_hwdep * hw, struct file *file,
	unsigned int cmd, unsigned long arg)
	{
	struct snd_opl3 *opl3 = hw->private_data;
	void __user argp = (void __user )arg;

	snd_assert(opl3 != NULL, return -EINVAL);

	switch (cmd) {
	/* get information */
	case SNDRV_DM_FM_IOCTL_INFO:
	{
	struct snd_dm_fm_info info;

	info.fm_mode = opl3->fm_mode;
	info.rhythm = opl3->rhythm;
	if (copy_to_user(argp, &info, sizeof(struct snd_dm_fm_info)))
	return -EFAULT;
	return 0;
	}

	case SNDRV_DM_FM_IOCTL_RESET:
	#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_RESET:
	#endif
	snd_opl3_reset(opl3);
	return 0;

	case SNDRV_DM_FM_IOCTL_PLAY_NOTE:
	#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_PLAY_NOTE:
	#endif
	{
	struct snd_dm_fm_note note;
	if (copy_from_user(&note, argp, sizeof(struct snd_dm_fm_note)))
	return -EFAULT;
	return snd_opl3_play_note(opl3, &note);
	}

	case SNDRV_DM_FM_IOCTL_SET_VOICE:
	#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_VOICE:
	#endif
	{
	struct snd_dm_fm_voice voice;
	if (copy_from_user(&voice, argp, sizeof(struct snd_dm_fm_voice)))
	return -EFAULT;
	return snd_opl3_set_voice(opl3, &voice);
	}

	case SNDRV_DM_FM_IOCTL_SET_PARAMS:
	#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_PARAMS:
	#endif
	{
	struct snd_dm_fm_params params;
	if (copy_from_user(&params, argp, sizeof(struct snd_dm_fm_params)))
	return -EFAULT;
	return snd_opl3_set_params(opl3, &params);
	}

	case SNDRV_DM_FM_IOCTL_SET_MODE:
	#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_MODE:
	#endif
	return snd_opl3_set_mode(opl3, (int) arg);

	case SNDRV_DM_FM_IOCTL_SET_CONNECTION:
	#ifdef CONFIG_SND_OSSEMUL
	case SNDRV_DM_FM_OSS_IOCTL_SET_OPL:
	#endif
	return snd_opl3_set_connection(opl3, (int) arg);

	case SNDRV_DM_FM_IOCTL_CLEAR_PATCHES:
	snd_opl3_clear_patches(opl3);
	return 0;

	#ifdef CONFIG_SND_DEBUG
	default:
	snd_printk("unknown IOCTL: 0x%x\n", cmd);
	#endif
	}
	return -ENOTTY;
	}

	/*
	* close the device
	*/
	int snd_opl3_release(struct snd_hwdep * hw, struct file *file)
	{
	struct snd_opl3 *opl3 = hw->private_data;

	snd_opl3_reset(opl3);
	return 0;
	}

	/*
	* write the device - load patches
	*/
	long snd_opl3_write(struct snd_hwdep hw, const char __user buf, long count,
	loff_t *offset)
	{
	struct snd_opl3 *opl3 = hw->private_data;
	long result = 0;
	int err = 0;
	struct sbi_patch inst;

	while (count >= sizeof(inst)) {
	unsigned char type;
	if (copy_from_user(&inst, buf, sizeof(inst)))
	return -EFAULT;
	if (!memcmp(inst.key, FM_KEY_SBI, 4) \|\|
	!memcmp(inst.key, FM_KEY_2OP, 4))
	type = FM_PATCH_OPL2;
	else if (!memcmp(inst.key, FM_KEY_4OP, 4))
	type = FM_PATCH_OPL3;
	else /* invalid type */
	break;
	err = snd_opl3_load_patch(opl3, inst.prog, inst.bank, type,
	inst.name, inst.extension,
	inst.data);
	if (err < 0)
	break;
	result += sizeof(inst);
	count -= sizeof(inst);
	}
	return result > 0 ? result : err;
	}


	/*
	* Patch management
	*/

	/* offsets for SBI params */
	#define AM_VIB 0
	#define KSL_LEVEL 2
	#define ATTACK_DECAY 4
	#define SUSTAIN_RELEASE 6
	#define WAVE_SELECT 8

	/* offset for SBI instrument */
	#define CONNECTION 10
	#define OFFSET_4OP 11

	/*
	* load a patch, obviously.
	*
	* loaded on the given program and bank numbers with the given type
	* (FM_PATCH_OPLx).
	* data is the pointer of SBI record _without_ header (key and name).
	* name is the name string of the patch.
	* ext is the extension data of 7 bytes long (stored in name of SBI
	* data up to offset 25), or NULL to skip.
	* return 0 if successful or a negative error code.
	*/
	int snd_opl3_load_patch(struct snd_opl3 *opl3,
	int prog, int bank, int type,
	const char *name,
	const unsigned char *ext,
	const unsigned char *data)
	{
	struct fm_patch *patch;
	int i;

	patch = snd_opl3_find_patch(opl3, prog, bank, 1);
	if (!patch)
	return -ENOMEM;

	patch->type = type;

	for (i = 0; i < 2; i++) {
	patch->inst.op[i].am_vib = data[AM_VIB + i];
	patch->inst.op[i].ksl_level = data[KSL_LEVEL + i];
	patch->inst.op[i].attack_decay = data[ATTACK_DECAY + i];
	patch->inst.op[i].sustain_release = data[SUSTAIN_RELEASE + i];
	patch->inst.op[i].wave_select = data[WAVE_SELECT + i];
	}
	patch->inst.feedback_connection[0] = data[CONNECTION];

	if (type == FM_PATCH_OPL3) {
	for (i = 0; i < 2; i++) {
	patch->inst.op[i+2].am_vib =
	data[OFFSET_4OP + AM_VIB + i];
	patch->inst.op[i+2].ksl_level =
	data[OFFSET_4OP + KSL_LEVEL + i];
	patch->inst.op[i+2].attack_decay =
	data[OFFSET_4OP + ATTACK_DECAY + i];
	patch->inst.op[i+2].sustain_release =
	data[OFFSET_4OP + SUSTAIN_RELEASE + i];
	patch->inst.op[i+2].wave_select =
	data[OFFSET_4OP + WAVE_SELECT + i];
	}
	patch->inst.feedback_connection[1] =
	data[OFFSET_4OP + CONNECTION];
	}

	if (ext) {
	patch->inst.echo_delay = ext[0];
	patch->inst.echo_atten = ext[1];
	patch->inst.chorus_spread = ext[2];
	patch->inst.trnsps = ext[3];
	patch->inst.fix_dur = ext[4];
	patch->inst.modes = ext[5];
	patch->inst.fix_key = ext[6];
	}

	if (name)
	strlcpy(patch->name, name, sizeof(patch->name));

	return 0;
	}
	EXPORT_SYMBOL(snd_opl3_load_patch);

	/*
	* find a patch with the given program and bank numbers, returns its pointer
	* if no matching patch is found and create_patch is set, it creates a
	* new patch object.
	*/
	struct fm_patch snd_opl3_find_patch(struct snd_opl3 opl3, int prog, int bank,
	int create_patch)
	{
	/* pretty dumb hash key */
	unsigned int key = (prog + bank) % OPL3_PATCH_HASH_SIZE;
	struct fm_patch *patch;

	for (patch = opl3->patch_table[key]; patch; patch = patch->next) {
	if (patch->prog == prog && patch->bank == bank)
	return patch;
	}
	if (!create_patch)
	return NULL;

	patch = kzalloc(sizeof(*patch), GFP_KERNEL);
	if (!patch)
	return NULL;
	patch->prog = prog;
	patch->bank = bank;
	patch->next = opl3->patch_table[key];
	opl3->patch_table[key] = patch;
	return patch;
	}
	EXPORT_SYMBOL(snd_opl3_find_patch);

	/*
	* Clear all patches of the given OPL3 instance
	*/
	void snd_opl3_clear_patches(struct snd_opl3 *opl3)
	{
	int i;
	for (i = 0; i < OPL3_PATCH_HASH_SIZE; i++) {
	struct fm_patch patch, next;
	for (patch = opl3->patch_table[i]; patch; patch = next) {
	next = patch->next;
	kfree(patch);
	}
	}
	memset(opl3->patch_table, 0, sizeof(opl3->patch_table));
	}

	/* ------------------------------ */

	void snd_opl3_reset(struct snd_opl3 * opl3)
	{
	unsigned short opl3_reg;

	unsigned short reg_side;
	unsigned char voice_offset;

	int max_voices, i;

	max_voices = (opl3->hardware < OPL3_HW_OPL3) ?
	MAX_OPL2_VOICES : MAX_OPL3_VOICES;

	for (i = 0; i < max_voices; i++) {
	/* Get register array side and offset of voice */
	if (i < MAX_OPL2_VOICES) {
	/* Left register block for voices 0 .. 8 */
	reg_side = OPL3_LEFT;
	voice_offset = i;
	} else {
	/* Right register block for voices 9 .. 17 */
	reg_side = OPL3_RIGHT;
	voice_offset = i - MAX_OPL2_VOICES;
	}
	opl3_reg = reg_side \| (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][0]);
	opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 1 volume */
	opl3_reg = reg_side \| (OPL3_REG_KSL_LEVEL + snd_opl3_regmap[voice_offset][1]);
	opl3->command(opl3, opl3_reg, OPL3_TOTAL_LEVEL_MASK); /* Operator 2 volume */

	opl3_reg = reg_side \| (OPL3_REG_KEYON_BLOCK + voice_offset);
	opl3->command(opl3, opl3_reg, 0x00); /* Note off */
	}

	opl3->max_voices = MAX_OPL2_VOICES;
	opl3->fm_mode = SNDRV_DM_FM_MODE_OPL2;

	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_TEST, OPL3_ENABLE_WAVE_SELECT);
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_PERCUSSION, 0x00); /* Melodic mode */
	opl3->rhythm = 0;
	}

	EXPORT_SYMBOL(snd_opl3_reset);

	static int snd_opl3_play_note(struct snd_opl3 * opl3, struct snd_dm_fm_note * note)
	{
	unsigned short reg_side;
	unsigned char voice_offset;

	unsigned short opl3_reg;
	unsigned char reg_val;

	/* Voices 0 - 8 in OPL2 mode */
	/* Voices 0 - 17 in OPL3 mode */
	if (note->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
	MAX_OPL3_VOICES : MAX_OPL2_VOICES))
	return -EINVAL;

	/* Get register array side and offset of voice */
	if (note->voice < MAX_OPL2_VOICES) {
	/* Left register block for voices 0 .. 8 */
	reg_side = OPL3_LEFT;
	voice_offset = note->voice;
	} else {
	/* Right register block for voices 9 .. 17 */
	reg_side = OPL3_RIGHT;
	voice_offset = note->voice - MAX_OPL2_VOICES;
	}

	/* Set lower 8 bits of note frequency */
	reg_val = (unsigned char) note->fnum;
	opl3_reg = reg_side \| (OPL3_REG_FNUM_LOW + voice_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	reg_val = 0x00;
	/* Set output sound flag */
	if (note->key_on)
	reg_val \|= OPL3_KEYON_BIT;
	/* Set octave */
	reg_val \|= (note->octave << 2) & OPL3_BLOCKNUM_MASK;
	/* Set higher 2 bits of note frequency */
	reg_val \|= (unsigned char) (note->fnum >> 8) & OPL3_FNUM_HIGH_MASK;

	/* Set OPL3 KEYON_BLOCK register of requested voice */
	opl3_reg = reg_side \| (OPL3_REG_KEYON_BLOCK + voice_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	return 0;
	}


	static int snd_opl3_set_voice(struct snd_opl3 * opl3, struct snd_dm_fm_voice * voice)
	{
	unsigned short reg_side;
	unsigned char op_offset;
	unsigned char voice_offset;

	unsigned short opl3_reg;
	unsigned char reg_val;

	/* Only operators 1 and 2 */
	if (voice->op > 1)
	return -EINVAL;
	/* Voices 0 - 8 in OPL2 mode */
	/* Voices 0 - 17 in OPL3 mode */
	if (voice->voice >= ((opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) ?
	MAX_OPL3_VOICES : MAX_OPL2_VOICES))
	return -EINVAL;

	/* Get register array side and offset of voice */
	if (voice->voice < MAX_OPL2_VOICES) {
	/* Left register block for voices 0 .. 8 */
	reg_side = OPL3_LEFT;
	voice_offset = voice->voice;
	} else {
	/* Right register block for voices 9 .. 17 */
	reg_side = OPL3_RIGHT;
	voice_offset = voice->voice - MAX_OPL2_VOICES;
	}
	/* Get register offset of operator */
	op_offset = snd_opl3_regmap[voice_offset][voice->op];

	reg_val = 0x00;
	/* Set amplitude modulation (tremolo) effect */
	if (voice->am)
	reg_val \|= OPL3_TREMOLO_ON;
	/* Set vibrato effect */
	if (voice->vibrato)
	reg_val \|= OPL3_VIBRATO_ON;
	/* Set sustaining sound phase */
	if (voice->do_sustain)
	reg_val \|= OPL3_SUSTAIN_ON;
	/* Set keyboard scaling bit */
	if (voice->kbd_scale)
	reg_val \|= OPL3_KSR;
	/* Set harmonic or frequency multiplier */
	reg_val \|= voice->harmonic & OPL3_MULTIPLE_MASK;

	/* Set OPL3 AM_VIB register of requested voice/operator */
	opl3_reg = reg_side \| (OPL3_REG_AM_VIB + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set decreasing volume of higher notes */
	reg_val = (voice->scale_level << 6) & OPL3_KSL_MASK;
	/* Set output volume */
	reg_val \|= ~voice->volume & OPL3_TOTAL_LEVEL_MASK;

	/* Set OPL3 KSL_LEVEL register of requested voice/operator */
	opl3_reg = reg_side \| (OPL3_REG_KSL_LEVEL + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set attack phase level */
	reg_val = (voice->attack << 4) & OPL3_ATTACK_MASK;
	/* Set decay phase level */
	reg_val \|= voice->decay & OPL3_DECAY_MASK;

	/* Set OPL3 ATTACK_DECAY register of requested voice/operator */
	opl3_reg = reg_side \| (OPL3_REG_ATTACK_DECAY + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set sustain phase level */
	reg_val = (voice->sustain << 4) & OPL3_SUSTAIN_MASK;
	/* Set release phase level */
	reg_val \|= voice->release & OPL3_RELEASE_MASK;

	/* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
	opl3_reg = reg_side \| (OPL3_REG_SUSTAIN_RELEASE + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Set inter-operator feedback */
	reg_val = (voice->feedback << 1) & OPL3_FEEDBACK_MASK;
	/* Set inter-operator connection */
	if (voice->connection)
	reg_val \|= OPL3_CONNECTION_BIT;
	/* OPL-3 only */
	if (opl3->fm_mode == SNDRV_DM_FM_MODE_OPL3) {
	if (voice->left)
	reg_val \|= OPL3_VOICE_TO_LEFT;
	if (voice->right)
	reg_val \|= OPL3_VOICE_TO_RIGHT;
	}
	/* Feedback/connection bits are applicable to voice */
	opl3_reg = reg_side \| (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	/* Select waveform */
	reg_val = voice->waveform & OPL3_WAVE_SELECT_MASK;
	opl3_reg = reg_side \| (OPL3_REG_WAVE_SELECT + op_offset);
	opl3->command(opl3, opl3_reg, reg_val);

	return 0;
	}

	static int snd_opl3_set_params(struct snd_opl3 * opl3, struct snd_dm_fm_params * params)
	{
	unsigned char reg_val;

	reg_val = 0x00;
	/* Set keyboard split method */
	if (params->kbd_split)
	reg_val \|= OPL3_KEYBOARD_SPLIT;
	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_KBD_SPLIT, reg_val);

	reg_val = 0x00;
	/* Set amplitude modulation (tremolo) depth */
	if (params->am_depth)
	reg_val \|= OPL3_TREMOLO_DEPTH;
	/* Set vibrato depth */
	if (params->vib_depth)
	reg_val \|= OPL3_VIBRATO_DEPTH;
	/* Set percussion mode */
	if (params->rhythm) {
	reg_val \|= OPL3_PERCUSSION_ENABLE;
	opl3->rhythm = 1;
	} else {
	opl3->rhythm = 0;
	}
	/* Play percussion instruments */
	if (params->bass)
	reg_val \|= OPL3_BASSDRUM_ON;
	if (params->snare)
	reg_val \|= OPL3_SNAREDRUM_ON;
	if (params->tomtom)
	reg_val \|= OPL3_TOMTOM_ON;
	if (params->cymbal)
	reg_val \|= OPL3_CYMBAL_ON;
	if (params->hihat)
	reg_val \|= OPL3_HIHAT_ON;

	opl3->command(opl3, OPL3_LEFT \| OPL3_REG_PERCUSSION, reg_val);
	return 0;
	}

	static int snd_opl3_set_mode(struct snd_opl3 * opl3, int mode)
	{
	if ((mode == SNDRV_DM_FM_MODE_OPL3) && (opl3->hardware < OPL3_HW_OPL3))
	return -EINVAL;

	opl3->fm_mode = mode;
	if (opl3->hardware >= OPL3_HW_OPL3)
	opl3->command(opl3, OPL3_RIGHT \| OPL3_REG_CONNECTION_SELECT, 0x00); /* Clear 4-op connections */

	return 0;
	}

	static int snd_opl3_set_connection(struct snd_opl3 * opl3, int connection)
	{
	unsigned char reg_val;

	/* OPL-3 only */
	if (opl3->fm_mode != SNDRV_DM_FM_MODE_OPL3)
	return -EINVAL;

	reg_val = connection & (OPL3_RIGHT_4OP_0 \| OPL3_RIGHT_4OP_1 \| OPL3_RIGHT_4OP_2 \|
	OPL3_LEFT_4OP_0 \| OPL3_LEFT_4OP_1 \| OPL3_LEFT_4OP_2);
	/* Set 4-op connections */
	opl3->command(opl3, OPL3_RIGHT \| OPL3_REG_CONNECTION_SELECT, reg_val);

	return 0;
	}