sound/pci/emu10k1/emu10k1_callback.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  synth callback routines for Emu10k1
  *
  *  Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
  */

 #include <linux/export.h>
 #include "emu10k1_synth_local.h"
 #include <sound/asoundef.h>

 /* voice status */
 enum {
 	V_FREE=0, V_OFF, V_RELEASED, V_PLAYING, V_END
 };

 /* Keeps track of what we are finding */
 struct best_voice {
 	unsigned int time;
 	int voice;
 };

 /*
  * prototypes
  */
 static void lookup_voices(struct snd_emux *emux, struct snd_emu10k1 *hw,
 			  struct best_voice *best, int active_only);
 static struct snd_emux_voice *get_voice(struct snd_emux *emux,
 					struct snd_emux_port *port);
 static int start_voice(struct snd_emux_voice *vp);
 static void trigger_voice(struct snd_emux_voice *vp);
 static void release_voice(struct snd_emux_voice *vp);
 static void update_voice(struct snd_emux_voice *vp, int update);
 static void terminate_voice(struct snd_emux_voice *vp);
 static void free_voice(struct snd_emux_voice *vp);
 static u32 make_fmmod(struct snd_emux_voice *vp);
 static u32 make_fm2frq2(struct snd_emux_voice *vp);
 static int get_pitch_shift(struct snd_emux *emu);

 /*
  * Ensure a value is between two points
  * macro evaluates its args more than once, so changed to upper-case.
  */
 #define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
 #define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)


 /*
  * set up operators
  */
 static const struct snd_emux_operators emu10k1_ops = {
 	.owner =	THIS_MODULE,
 	.get_voice =	get_voice,
 	.prepare =	start_voice,
 	.trigger =	trigger_voice,
 	.release =	release_voice,
 	.update =	update_voice,
 	.terminate =	terminate_voice,
 	.free_voice =	free_voice,
 	.sample_new =	snd_emu10k1_sample_new,
 	.sample_free =	snd_emu10k1_sample_free,
 	.get_pitch_shift = get_pitch_shift,
 };

 void
 snd_emu10k1_ops_setup(struct snd_emux *emux)
 {
 	emux->ops = emu10k1_ops;
 }


 /*
  * get more voice for pcm
  *
  * terminate most inactive voice and give it as a pcm voice.
  *
  * voice_lock is already held.
  */
 int
 snd_emu10k1_synth_get_voice(struct snd_emu10k1 *hw)
 {
 	struct snd_emux *emu;
 	struct snd_emux_voice *vp;
 	struct best_voice best[V_END];
 	int i;

 	emu = hw->synth;

 	lookup_voices(emu, hw, best, 1); /* no OFF voices */
 	for (i = 0; i < V_END; i++) {
 		if (best[i].voice >= 0) {
 			int ch;
 			vp = &emu->voices[best[i].voice];
 			ch = vp->ch;
 			if (ch < 0) {
 				/*
 				dev_warn(emu->card->dev,
 				       "synth_get_voice: ch < 0 (%d) ??", i);
 				*/
 				continue;
 			}
 			vp->emu->num_voices--;
 			vp->ch = -1;
 			vp->state = SNDRV_EMUX_ST_OFF;
 			return ch;
 		}
 	}

 	/* not found */
 	return -ENOMEM;
 }


 /*
  * turn off the voice (not terminated)
  */
 static void
 release_voice(struct snd_emux_voice *vp)
 {
 	struct snd_emu10k1 *hw;

 	hw = vp->hw;
 	snd_emu10k1_ptr_write_multiple(hw, vp->ch,
 		DCYSUSM, (unsigned char)vp->reg.parm.modrelease | DCYSUSM_PHASE1_MASK,
 		DCYSUSV, (unsigned char)vp->reg.parm.volrelease | DCYSUSV_PHASE1_MASK | DCYSUSV_CHANNELENABLE_MASK,
 		REGLIST_END);
 }


 /*
  * terminate the voice
  */
 static void
 terminate_voice(struct snd_emux_voice *vp)
 {
 	struct snd_emu10k1 *hw;

 	if (snd_BUG_ON(!vp))
 		return;
 	hw = vp->hw;
 	snd_emu10k1_ptr_write_multiple(hw, vp->ch,
 		DCYSUSV, 0,
 		VTFT, VTFT_FILTERTARGET_MASK,
 		CVCF, CVCF_CURRENTFILTER_MASK,
 		PTRX, 0,
 		CPF, 0,
 		REGLIST_END);
 	if (vp->block) {
 		struct snd_emu10k1_memblk *emem;
 		emem = (struct snd_emu10k1_memblk *)vp->block;
 		if (emem->map_locked > 0)
 			emem->map_locked--;
 	}
 }

 /*
  * release the voice to system
  */
 static void
 free_voice(struct snd_emux_voice *vp)
 {
 	struct snd_emu10k1 *hw;

 	hw = vp->hw;
 	/* FIXME: emu10k1_synth is broken. */
 	/* This can get called with hw == 0 */
 	/* Problem apparent on plug, unplug then plug */
 	/* on the Audigy 2 ZS Notebook. */
 	if (hw && (vp->ch >= 0)) {
 		snd_emu10k1_voice_free(hw, &hw->voices[vp->ch]);
 		vp->emu->num_voices--;
 		vp->ch = -1;
 	}
 }


 /*
  * update registers
  */
 static void
 update_voice(struct snd_emux_voice *vp, int update)
 {
 	struct snd_emu10k1 *hw;

 	hw = vp->hw;
 	if (update & SNDRV_EMUX_UPDATE_VOLUME)
 		snd_emu10k1_ptr_write(hw, IFATN_ATTENUATION, vp->ch, vp->avol);
 	if (update & SNDRV_EMUX_UPDATE_PITCH)
 		snd_emu10k1_ptr_write(hw, IP, vp->ch, vp->apitch);
 	if (update & SNDRV_EMUX_UPDATE_PAN) {
 		snd_emu10k1_ptr_write(hw, PTRX_FXSENDAMOUNT_A, vp->ch, vp->apan);
 		snd_emu10k1_ptr_write(hw, PTRX_FXSENDAMOUNT_B, vp->ch, vp->aaux);
 	}
 	if (update & SNDRV_EMUX_UPDATE_FMMOD)
 		snd_emu10k1_ptr_write(hw, FMMOD, vp->ch, make_fmmod(vp));
 	if (update & SNDRV_EMUX_UPDATE_TREMFREQ)
 		snd_emu10k1_ptr_write(hw, TREMFRQ, vp->ch, vp->reg.parm.tremfrq);
 	if (update & SNDRV_EMUX_UPDATE_FM2FRQ2)
 		snd_emu10k1_ptr_write(hw, FM2FRQ2, vp->ch, make_fm2frq2(vp));
 	if (update & SNDRV_EMUX_UPDATE_Q)
 		snd_emu10k1_ptr_write(hw, CCCA_RESONANCE, vp->ch, vp->reg.parm.filterQ);
 }


 /*
  * look up voice table - get the best voice in order of preference
  */
 /* spinlock held! */
 static void
 lookup_voices(struct snd_emux *emu, struct snd_emu10k1 *hw,
 	      struct best_voice *best, int active_only)
 {
 	struct snd_emux_voice *vp;
 	struct best_voice *bp;
 	int  i;

 	for (i = 0; i < V_END; i++) {
 		best[i].time = (unsigned int)-1; /* XXX MAX_?INT really */
 		best[i].voice = -1;
 	}

 	/*
 	 * Go through them all and get a best one to use.
 	 * NOTE: could also look at volume and pick the quietest one.
 	 */
 	for (i = 0; i < emu->max_voices; i++) {
 		int state, val;

 		vp = &emu->voices[i];
 		state = vp->state;
 		if (state == SNDRV_EMUX_ST_OFF) {
 			if (vp->ch < 0) {
 				if (active_only)
 					continue;
 				bp = best + V_FREE;
 			} else
 				bp = best + V_OFF;
 		}
 		else if (state == SNDRV_EMUX_ST_RELEASED ||
 			 state == SNDRV_EMUX_ST_PENDING) {
 			bp = best + V_RELEASED;
 #if 1
 			val = snd_emu10k1_ptr_read(hw, CVCF_CURRENTVOL, vp->ch);
 			if (! val)
 				bp = best + V_OFF;
 #endif
 		}
 		else if (state == SNDRV_EMUX_ST_STANDBY)
 			continue;
 		else if (state & SNDRV_EMUX_ST_ON)
 			bp = best + V_PLAYING;
 		else
 			continue;

 		/* check if sample is finished playing (non-looping only) */
 		if (bp != best + V_OFF && bp != best + V_FREE &&
 		    (vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_SINGLESHOT)) {
 			val = snd_emu10k1_ptr_read(hw, CCCA_CURRADDR, vp->ch) - 64 + 3;
 			if (val >= vp->reg.loopstart)
 				bp = best + V_OFF;
 		}

 		if (vp->time < bp->time) {
 			bp->time = vp->time;
 			bp->voice = i;
 		}
 	}
 }

 /*
  * get an empty voice
  *
  * emu->voice_lock is already held.
  */
 static struct snd_emux_voice *
 get_voice(struct snd_emux *emu, struct snd_emux_port *port)
 {
 	struct snd_emu10k1 *hw;
 	struct snd_emux_voice *vp;
 	struct best_voice best[V_END];
 	int i;

 	hw = emu->hw;

 	lookup_voices(emu, hw, best, 0);
 	for (i = 0; i < V_END; i++) {
 		if (best[i].voice >= 0) {
 			vp = &emu->voices[best[i].voice];
 			if (vp->ch < 0) {
 				/* allocate a voice */
 				struct snd_emu10k1_voice *hwvoice;
 				if (snd_emu10k1_voice_alloc(hw, EMU10K1_SYNTH, 1, 1, NULL, &hwvoice) < 0)
 					continue;
 				vp->ch = hwvoice->number;
 				emu->num_voices++;
 			}
 			return vp;
 		}
 	}

 	/* not found */
 	return NULL;
 }

 /*
  * prepare envelopes and LFOs
  */
 static int
 start_voice(struct snd_emux_voice *vp)
 {
 	unsigned int temp;
 	int ch;
 	bool w_16;
 	u32 psst, dsl, map, ccca, vtarget;
 	unsigned int addr, mapped_offset;
 	struct snd_midi_channel *chan;
 	struct snd_emu10k1 *hw;
 	struct snd_emu10k1_memblk *emem;

 	hw = vp->hw;
 	ch = vp->ch;
 	if (snd_BUG_ON(ch < 0))
 		return -EINVAL;
 	chan = vp->chan;
 	w_16 = !(vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_8BITS);

 	emem = (struct snd_emu10k1_memblk *)vp->block;
 	if (emem == NULL)
 		return -EINVAL;
 	emem->map_locked++;
 	if (snd_emu10k1_memblk_map(hw, emem) < 0) {
 		/* dev_err(hw->card->devK, "emu: cannot map!\n"); */
 		return -ENOMEM;
 	}
 	mapped_offset = snd_emu10k1_memblk_offset(emem) >> w_16;
 	vp->reg.start += mapped_offset;
 	vp->reg.end += mapped_offset;
 	vp->reg.loopstart += mapped_offset;
 	vp->reg.loopend += mapped_offset;

 	/* set channel routing */
 	/* A = left(0), B = right(1), C = reverb(c), D = chorus(d) */
 	if (hw->audigy) {
 		temp = FXBUS_MIDI_LEFT | (FXBUS_MIDI_RIGHT << 8) |
 			(FXBUS_MIDI_REVERB << 16) | (FXBUS_MIDI_CHORUS << 24);
 		snd_emu10k1_ptr_write(hw, A_FXRT1, ch, temp);
 	} else {
 		temp = (FXBUS_MIDI_LEFT << 16) | (FXBUS_MIDI_RIGHT << 20) |
 			(FXBUS_MIDI_REVERB << 24) | (FXBUS_MIDI_CHORUS << 28);
 		snd_emu10k1_ptr_write(hw, FXRT, ch, temp);
 	}

 	temp = vp->reg.parm.reverb;
 	temp += (int)vp->chan->control[MIDI_CTL_E1_REVERB_DEPTH] * 9 / 10;
 	LIMITMAX(temp, 255);
 	addr = vp->reg.loopstart;
 	psst = (temp << 24) | addr;

 	addr = vp->reg.loopend;
 	temp = vp->reg.parm.chorus;
 	temp += (int)chan->control[MIDI_CTL_E3_CHORUS_DEPTH] * 9 / 10;
 	LIMITMAX(temp, 255);
 	dsl = (temp << 24) | addr;

 	map = (hw->silent_page.addr << hw->address_mode) | (hw->address_mode ? MAP_PTI_MASK1 : MAP_PTI_MASK0);

 	addr = vp->reg.start + 64 - 3;
 	temp = vp->reg.parm.filterQ;
 	ccca = (temp << 28) | addr;
 	if (vp->apitch < 0xe400)
 		ccca |= CCCA_INTERPROM_0;
 	else {
 		unsigned int shift = (vp->apitch - 0xe000) >> 10;
 		ccca |= shift << 25;
 	}
 	if (!w_16)
 		ccca |= CCCA_8BITSELECT;

 	vtarget = (unsigned int)vp->vtarget << 16;

 	snd_emu10k1_ptr_write_multiple(hw, ch,
 		/* channel to be silent and idle */
 		DCYSUSV, 0,
 		VTFT, VTFT_FILTERTARGET_MASK,
 		CVCF, CVCF_CURRENTFILTER_MASK,
 		PTRX, 0,
 		CPF, 0,

 		/* set pitch offset */
 		IP, vp->apitch,

 		/* set envelope parameters */
 		ENVVAL, vp->reg.parm.moddelay,
 		ATKHLDM, vp->reg.parm.modatkhld,
 		DCYSUSM, vp->reg.parm.moddcysus,
 		ENVVOL, vp->reg.parm.voldelay,
 		ATKHLDV, vp->reg.parm.volatkhld,
 		/* decay/sustain parameter for volume envelope is used
 		   for triggerg the voice */

 		/* cutoff and volume */
 		IFATN, (unsigned int)vp->acutoff << 8 | (unsigned char)vp->avol,

 		/* modulation envelope heights */
 		PEFE, vp->reg.parm.pefe,

 		/* lfo1/2 delay */
 		LFOVAL1, vp->reg.parm.lfo1delay,
 		LFOVAL2, vp->reg.parm.lfo2delay,

 		/* lfo1 pitch & cutoff shift */
 		FMMOD, make_fmmod(vp),
 		/* lfo1 volume & freq */
 		TREMFRQ, vp->reg.parm.tremfrq,
 		/* lfo2 pitch & freq */
 		FM2FRQ2, make_fm2frq2(vp),

 		/* reverb and loop start (reverb 8bit, MSB) */
 		PSST, psst,

 		/* chorus & loop end (chorus 8bit, MSB) */
 		DSL, dsl,

 		/* clear filter delay memory */
 		Z1, 0,
 		Z2, 0,

 		/* invalidate maps */
 		MAPA, map,
 		MAPB, map,

 		/* Q & current address (Q 4bit value, MSB) */
 		CCCA, ccca,

 		/* cache */
 		CCR, REG_VAL_PUT(CCR_CACHEINVALIDSIZE, 64),

 		/* reset volume */
 		VTFT, vtarget | vp->ftarget,
 		CVCF, vtarget | CVCF_CURRENTFILTER_MASK,

 		REGLIST_END);

 	hw->voices[ch].dirty = 1;
 	return 0;
 }

 /*
  * Start envelope
  */
 static void
 trigger_voice(struct snd_emux_voice *vp)
 {
 	unsigned int ptarget;
 	struct snd_emu10k1 *hw;
 	struct snd_emu10k1_memblk *emem;

 	hw = vp->hw;

 	emem = (struct snd_emu10k1_memblk *)vp->block;
 	if (! emem || emem->mapped_page < 0)
 		return; /* not mapped */

 #if 0
 	ptarget = (unsigned int)vp->ptarget << 16;
 #else
 	ptarget = IP_TO_CP(vp->apitch);
 #endif
 	snd_emu10k1_ptr_write_multiple(hw, vp->ch,
 		/* set pitch target and pan (volume) */
 		PTRX, ptarget | (vp->apan << 8) | vp->aaux,

 		/* current pitch and fractional address */
 		CPF, ptarget,

 		/* enable envelope engine */
 		DCYSUSV, vp->reg.parm.voldcysus | DCYSUSV_CHANNELENABLE_MASK,

 		REGLIST_END);
 }

 #define MOD_SENSE 18

 /* calculate lfo1 modulation height and cutoff register */
 static u32
 make_fmmod(struct snd_emux_voice *vp)
 {
 	short pitch;
 	unsigned char cutoff;
 	int modulation;

 	pitch = (char)(vp->reg.parm.fmmod>>8);
 	cutoff = (vp->reg.parm.fmmod & 0xff);
 	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
 	pitch += (MOD_SENSE * modulation) / 1200;
 	LIMITVALUE(pitch, -128, 127);
 	return ((unsigned char)pitch << 8) | cutoff;
 }

 /* calculate set lfo2 pitch & frequency register */
 static u32
 make_fm2frq2(struct snd_emux_voice *vp)
 {
 	short pitch;
 	unsigned char freq;
 	int modulation;

 	pitch = (char)(vp->reg.parm.fm2frq2>>8);
 	freq = vp->reg.parm.fm2frq2 & 0xff;
 	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
 	pitch += (MOD_SENSE * modulation) / 1200;
 	LIMITVALUE(pitch, -128, 127);
 	return ((unsigned char)pitch << 8) | freq;
 }

 static int get_pitch_shift(struct snd_emux *emu)
 {
 	struct snd_emu10k1 *hw = emu->hw;

 	return (hw->card_capabilities->emu_model &&
 			hw->emu1010.word_clock == 44100) ? 0 : -501;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* synth callback routines for Emu10k1
	*
	* Copyright (C) 2000 Takashi Iwai <tiwai@suse.de>
	*/

	#include <linux/export.h>
	#include "emu10k1_synth_local.h"
	#include <sound/asoundef.h>

	/* voice status */
	enum {
	V_FREE=0, V_OFF, V_RELEASED, V_PLAYING, V_END
	};

	/* Keeps track of what we are finding */
	struct best_voice {
	unsigned int time;
	int voice;
	};

	/*
	* prototypes
	*/
	static void lookup_voices(struct snd_emux emux, struct snd_emu10k1 hw,
	struct best_voice *best, int active_only);
	static struct snd_emux_voice get_voice(struct snd_emux emux,
	struct snd_emux_port *port);
	static int start_voice(struct snd_emux_voice *vp);
	static void trigger_voice(struct snd_emux_voice *vp);
	static void release_voice(struct snd_emux_voice *vp);
	static void update_voice(struct snd_emux_voice *vp, int update);
	static void terminate_voice(struct snd_emux_voice *vp);
	static void free_voice(struct snd_emux_voice *vp);
	static u32 make_fmmod(struct snd_emux_voice *vp);
	static u32 make_fm2frq2(struct snd_emux_voice *vp);
	static int get_pitch_shift(struct snd_emux *emu);

	/*
	* Ensure a value is between two points
	* macro evaluates its args more than once, so changed to upper-case.
	*/
	#define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
	#define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)


	/*
	* set up operators
	*/
	static const struct snd_emux_operators emu10k1_ops = {
	.owner = THIS_MODULE,
	.get_voice = get_voice,
	.prepare = start_voice,
	.trigger = trigger_voice,
	.release = release_voice,
	.update = update_voice,
	.terminate = terminate_voice,
	.free_voice = free_voice,
	.sample_new = snd_emu10k1_sample_new,
	.sample_free = snd_emu10k1_sample_free,
	.get_pitch_shift = get_pitch_shift,
	};

	void
	snd_emu10k1_ops_setup(struct snd_emux *emux)
	{
	emux->ops = emu10k1_ops;
	}


	/*
	* get more voice for pcm
	*
	* terminate most inactive voice and give it as a pcm voice.
	*
	* voice_lock is already held.
	*/
	int
	snd_emu10k1_synth_get_voice(struct snd_emu10k1 *hw)
	{
	struct snd_emux *emu;
	struct snd_emux_voice *vp;
	struct best_voice best[V_END];
	int i;

	emu = hw->synth;

	lookup_voices(emu, hw, best, 1); /* no OFF voices */
	for (i = 0; i < V_END; i++) {
	if (best[i].voice >= 0) {
	int ch;
	vp = &emu->voices[best[i].voice];
	ch = vp->ch;
	if (ch < 0) {
	/*
	dev_warn(emu->card->dev,
	"synth_get_voice: ch < 0 (%d) ??", i);
	*/
	continue;
	}
	vp->emu->num_voices--;
	vp->ch = -1;
	vp->state = SNDRV_EMUX_ST_OFF;
	return ch;
	}
	}

	/* not found */
	return -ENOMEM;
	}


	/*
	* turn off the voice (not terminated)
	*/
	static void
	release_voice(struct snd_emux_voice *vp)
	{
	struct snd_emu10k1 *hw;

	hw = vp->hw;
	snd_emu10k1_ptr_write_multiple(hw, vp->ch,
	DCYSUSM, (unsigned char)vp->reg.parm.modrelease \| DCYSUSM_PHASE1_MASK,
	DCYSUSV, (unsigned char)vp->reg.parm.volrelease \| DCYSUSV_PHASE1_MASK \| DCYSUSV_CHANNELENABLE_MASK,
	REGLIST_END);
	}


	/*
	* terminate the voice
	*/
	static void
	terminate_voice(struct snd_emux_voice *vp)
	{
	struct snd_emu10k1 *hw;

	if (snd_BUG_ON(!vp))
	return;
	hw = vp->hw;
	snd_emu10k1_ptr_write_multiple(hw, vp->ch,
	DCYSUSV, 0,
	VTFT, VTFT_FILTERTARGET_MASK,
	CVCF, CVCF_CURRENTFILTER_MASK,
	PTRX, 0,
	CPF, 0,
	REGLIST_END);
	if (vp->block) {
	struct snd_emu10k1_memblk *emem;
	emem = (struct snd_emu10k1_memblk *)vp->block;
	if (emem->map_locked > 0)
	emem->map_locked--;
	}
	}

	/*
	* release the voice to system
	*/
	static void
	free_voice(struct snd_emux_voice *vp)
	{
	struct snd_emu10k1 *hw;

	hw = vp->hw;
	/* FIXME: emu10k1_synth is broken. */
	/* This can get called with hw == 0 */
	/* Problem apparent on plug, unplug then plug */
	/* on the Audigy 2 ZS Notebook. */
	if (hw && (vp->ch >= 0)) {
	snd_emu10k1_voice_free(hw, &hw->voices[vp->ch]);
	vp->emu->num_voices--;
	vp->ch = -1;
	}
	}


	/*
	* update registers
	*/
	static void
	update_voice(struct snd_emux_voice *vp, int update)
	{
	struct snd_emu10k1 *hw;

	hw = vp->hw;
	if (update & SNDRV_EMUX_UPDATE_VOLUME)
	snd_emu10k1_ptr_write(hw, IFATN_ATTENUATION, vp->ch, vp->avol);
	if (update & SNDRV_EMUX_UPDATE_PITCH)
	snd_emu10k1_ptr_write(hw, IP, vp->ch, vp->apitch);
	if (update & SNDRV_EMUX_UPDATE_PAN) {
	snd_emu10k1_ptr_write(hw, PTRX_FXSENDAMOUNT_A, vp->ch, vp->apan);
	snd_emu10k1_ptr_write(hw, PTRX_FXSENDAMOUNT_B, vp->ch, vp->aaux);
	}
	if (update & SNDRV_EMUX_UPDATE_FMMOD)
	snd_emu10k1_ptr_write(hw, FMMOD, vp->ch, make_fmmod(vp));
	if (update & SNDRV_EMUX_UPDATE_TREMFREQ)
	snd_emu10k1_ptr_write(hw, TREMFRQ, vp->ch, vp->reg.parm.tremfrq);
	if (update & SNDRV_EMUX_UPDATE_FM2FRQ2)
	snd_emu10k1_ptr_write(hw, FM2FRQ2, vp->ch, make_fm2frq2(vp));
	if (update & SNDRV_EMUX_UPDATE_Q)
	snd_emu10k1_ptr_write(hw, CCCA_RESONANCE, vp->ch, vp->reg.parm.filterQ);
	}


	/*
	* look up voice table - get the best voice in order of preference
	*/
	/* spinlock held! */
	static void
	lookup_voices(struct snd_emux emu, struct snd_emu10k1 hw,
	struct best_voice *best, int active_only)
	{
	struct snd_emux_voice *vp;
	struct best_voice *bp;
	int i;

	for (i = 0; i < V_END; i++) {
	best[i].time = (unsigned int)-1; /* XXX MAX_?INT really */
	best[i].voice = -1;
	}

	/*
	* Go through them all and get a best one to use.
	* NOTE: could also look at volume and pick the quietest one.
	*/
	for (i = 0; i < emu->max_voices; i++) {
	int state, val;

	vp = &emu->voices[i];
	state = vp->state;
	if (state == SNDRV_EMUX_ST_OFF) {
	if (vp->ch < 0) {
	if (active_only)
	continue;
	bp = best + V_FREE;
	} else
	bp = best + V_OFF;
	}
	else if (state == SNDRV_EMUX_ST_RELEASED \|\|
	state == SNDRV_EMUX_ST_PENDING) {
	bp = best + V_RELEASED;
	#if 1
	val = snd_emu10k1_ptr_read(hw, CVCF_CURRENTVOL, vp->ch);
	if (! val)
	bp = best + V_OFF;
	#endif
	}
	else if (state == SNDRV_EMUX_ST_STANDBY)
	continue;
	else if (state & SNDRV_EMUX_ST_ON)
	bp = best + V_PLAYING;
	else
	continue;

	/* check if sample is finished playing (non-looping only) */
	if (bp != best + V_OFF && bp != best + V_FREE &&
	(vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_SINGLESHOT)) {
	val = snd_emu10k1_ptr_read(hw, CCCA_CURRADDR, vp->ch) - 64 + 3;
	if (val >= vp->reg.loopstart)
	bp = best + V_OFF;
	}

	if (vp->time < bp->time) {
	bp->time = vp->time;
	bp->voice = i;
	}
	}
	}

	/*
	* get an empty voice
	*
	* emu->voice_lock is already held.
	*/
	static struct snd_emux_voice *
	get_voice(struct snd_emux emu, struct snd_emux_port port)
	{
	struct snd_emu10k1 *hw;
	struct snd_emux_voice *vp;
	struct best_voice best[V_END];
	int i;

	hw = emu->hw;

	lookup_voices(emu, hw, best, 0);
	for (i = 0; i < V_END; i++) {
	if (best[i].voice >= 0) {
	vp = &emu->voices[best[i].voice];
	if (vp->ch < 0) {
	/* allocate a voice */
	struct snd_emu10k1_voice *hwvoice;
	if (snd_emu10k1_voice_alloc(hw, EMU10K1_SYNTH, 1, 1, NULL, &hwvoice) < 0)
	continue;
	vp->ch = hwvoice->number;
	emu->num_voices++;
	}
	return vp;
	}
	}

	/* not found */
	return NULL;
	}

	/*
	* prepare envelopes and LFOs
	*/
	static int
	start_voice(struct snd_emux_voice *vp)
	{
	unsigned int temp;
	int ch;
	bool w_16;
	u32 psst, dsl, map, ccca, vtarget;
	unsigned int addr, mapped_offset;
	struct snd_midi_channel *chan;
	struct snd_emu10k1 *hw;
	struct snd_emu10k1_memblk *emem;

	hw = vp->hw;
	ch = vp->ch;
	if (snd_BUG_ON(ch < 0))
	return -EINVAL;
	chan = vp->chan;
	w_16 = !(vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_8BITS);

	emem = (struct snd_emu10k1_memblk *)vp->block;
	if (emem == NULL)
	return -EINVAL;
	emem->map_locked++;
	if (snd_emu10k1_memblk_map(hw, emem) < 0) {
	/* dev_err(hw->card->devK, "emu: cannot map!\n"); */
	return -ENOMEM;
	}
	mapped_offset = snd_emu10k1_memblk_offset(emem) >> w_16;
	vp->reg.start += mapped_offset;
	vp->reg.end += mapped_offset;
	vp->reg.loopstart += mapped_offset;
	vp->reg.loopend += mapped_offset;

	/* set channel routing */
	/* A = left(0), B = right(1), C = reverb(c), D = chorus(d) */
	if (hw->audigy) {
	temp = FXBUS_MIDI_LEFT \| (FXBUS_MIDI_RIGHT << 8) \|
	(FXBUS_MIDI_REVERB << 16) \| (FXBUS_MIDI_CHORUS << 24);
	snd_emu10k1_ptr_write(hw, A_FXRT1, ch, temp);
	} else {
	temp = (FXBUS_MIDI_LEFT << 16) \| (FXBUS_MIDI_RIGHT << 20) \|
	(FXBUS_MIDI_REVERB << 24) \| (FXBUS_MIDI_CHORUS << 28);
	snd_emu10k1_ptr_write(hw, FXRT, ch, temp);
	}

	temp = vp->reg.parm.reverb;
	temp += (int)vp->chan->control[MIDI_CTL_E1_REVERB_DEPTH] * 9 / 10;
	LIMITMAX(temp, 255);
	addr = vp->reg.loopstart;
	psst = (temp << 24) \| addr;

	addr = vp->reg.loopend;
	temp = vp->reg.parm.chorus;
	temp += (int)chan->control[MIDI_CTL_E3_CHORUS_DEPTH] * 9 / 10;
	LIMITMAX(temp, 255);
	dsl = (temp << 24) \| addr;

	map = (hw->silent_page.addr << hw->address_mode) \| (hw->address_mode ? MAP_PTI_MASK1 : MAP_PTI_MASK0);

	addr = vp->reg.start + 64 - 3;
	temp = vp->reg.parm.filterQ;
	ccca = (temp << 28) \| addr;
	if (vp->apitch < 0xe400)
	ccca \|= CCCA_INTERPROM_0;
	else {
	unsigned int shift = (vp->apitch - 0xe000) >> 10;
	ccca \|= shift << 25;
	}
	if (!w_16)
	ccca \|= CCCA_8BITSELECT;

	vtarget = (unsigned int)vp->vtarget << 16;

	snd_emu10k1_ptr_write_multiple(hw, ch,
	/* channel to be silent and idle */
	DCYSUSV, 0,
	VTFT, VTFT_FILTERTARGET_MASK,
	CVCF, CVCF_CURRENTFILTER_MASK,
	PTRX, 0,
	CPF, 0,

	/* set pitch offset */
	IP, vp->apitch,

	/* set envelope parameters */
	ENVVAL, vp->reg.parm.moddelay,
	ATKHLDM, vp->reg.parm.modatkhld,
	DCYSUSM, vp->reg.parm.moddcysus,
	ENVVOL, vp->reg.parm.voldelay,
	ATKHLDV, vp->reg.parm.volatkhld,
	/* decay/sustain parameter for volume envelope is used
	for triggerg the voice */

	/* cutoff and volume */
	IFATN, (unsigned int)vp->acutoff << 8 \| (unsigned char)vp->avol,

	/* modulation envelope heights */
	PEFE, vp->reg.parm.pefe,

	/* lfo1/2 delay */
	LFOVAL1, vp->reg.parm.lfo1delay,
	LFOVAL2, vp->reg.parm.lfo2delay,

	/* lfo1 pitch & cutoff shift */
	FMMOD, make_fmmod(vp),
	/* lfo1 volume & freq */
	TREMFRQ, vp->reg.parm.tremfrq,
	/* lfo2 pitch & freq */
	FM2FRQ2, make_fm2frq2(vp),

	/* reverb and loop start (reverb 8bit, MSB) */
	PSST, psst,

	/* chorus & loop end (chorus 8bit, MSB) */
	DSL, dsl,

	/* clear filter delay memory */
	Z1, 0,
	Z2, 0,

	/* invalidate maps */
	MAPA, map,
	MAPB, map,

	/* Q & current address (Q 4bit value, MSB) */
	CCCA, ccca,

	/* cache */
	CCR, REG_VAL_PUT(CCR_CACHEINVALIDSIZE, 64),

	/* reset volume */
	VTFT, vtarget \| vp->ftarget,
	CVCF, vtarget \| CVCF_CURRENTFILTER_MASK,

	REGLIST_END);

	hw->voices[ch].dirty = 1;
	return 0;
	}

	/*
	* Start envelope
	*/
	static void
	trigger_voice(struct snd_emux_voice *vp)
	{
	unsigned int ptarget;
	struct snd_emu10k1 *hw;
	struct snd_emu10k1_memblk *emem;

	hw = vp->hw;

	emem = (struct snd_emu10k1_memblk *)vp->block;
	if (! emem \|\| emem->mapped_page < 0)
	return; /* not mapped */

	#if 0
	ptarget = (unsigned int)vp->ptarget << 16;
	#else
	ptarget = IP_TO_CP(vp->apitch);
	#endif
	snd_emu10k1_ptr_write_multiple(hw, vp->ch,
	/* set pitch target and pan (volume) */
	PTRX, ptarget \| (vp->apan << 8) \| vp->aaux,

	/* current pitch and fractional address */
	CPF, ptarget,

	/* enable envelope engine */
	DCYSUSV, vp->reg.parm.voldcysus \| DCYSUSV_CHANNELENABLE_MASK,

	REGLIST_END);
	}

	#define MOD_SENSE 18

	/* calculate lfo1 modulation height and cutoff register */
	static u32
	make_fmmod(struct snd_emux_voice *vp)
	{
	short pitch;
	unsigned char cutoff;
	int modulation;

	pitch = (char)(vp->reg.parm.fmmod>>8);
	cutoff = (vp->reg.parm.fmmod & 0xff);
	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
	pitch += (MOD_SENSE * modulation) / 1200;
	LIMITVALUE(pitch, -128, 127);
	return ((unsigned char)pitch << 8) \| cutoff;
	}

	/* calculate set lfo2 pitch & frequency register */
	static u32
	make_fm2frq2(struct snd_emux_voice *vp)
	{
	short pitch;
	unsigned char freq;
	int modulation;

	pitch = (char)(vp->reg.parm.fm2frq2>>8);
	freq = vp->reg.parm.fm2frq2 & 0xff;
	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
	pitch += (MOD_SENSE * modulation) / 1200;
	LIMITVALUE(pitch, -128, 127);
	return ((unsigned char)pitch << 8) \| freq;
	}

	static int get_pitch_shift(struct snd_emux *emu)
	{
	struct snd_emu10k1 *hw = emu->hw;

	return (hw->card_capabilities->emu_model &&
	hw->emu1010.word_clock == 44100) ? 0 : -501;
	}