xref: /src/sys/dev/isa/sbdsp.c

/*	$NetBSD: sbdsp.c,v 1.51 1997/05/20 12:51:47 augustss Exp $	*/

/*
 * Copyright (c) 1991-1993 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the Computer Systems
 *	Engineering Group at Lawrence Berkeley Laboratory.
 * 4. Neither the name of the University nor of the Laboratory may be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

/*
 * SoundBlaster Pro code provided by John Kohl, based on lots of
 * information he gleaned from Steve Haehnichen <steve (at) vigra.com>'s
 * SBlast driver for 386BSD and DOS driver code from Daniel Sachs
 * <sachs (at) meibm15.cen.uiuc.edu>.
 * Lots of rewrites by Lennart Augustsson with information from
 * SB "Hardware Programming Guide" and the Linux drivers.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <vm/vm.h>

#include <machine/cpu.h>
#include <machine/intr.h>
#include <machine/pio.h>

#include <sys/audioio.h>
#include <dev/audio_if.h>
#include <dev/mulaw.h>

#include <dev/isa/isavar.h>
#include <dev/isa/isadmavar.h>
#include <i386/isa/icu.h>			/* XXX BROKEN; WHY? */

#include <dev/isa/sbreg.h>
#include <dev/isa/sbdspvar.h>

#ifdef AUDIO_DEBUG
extern void Dprintf __P((const char *, ...));
#define DPRINTF(x)	if (sbdspdebug) Dprintf x
int	sbdspdebug = 0;
#else
#define DPRINTF(x)
#endif

#ifndef SBDSP_NPOLL
#define SBDSP_NPOLL 3000
#endif

struct {
	int wdsp;
	int rdsp;
	int wmidi;
} sberr;

void sbdsp_srtotc __P((struct sbdsp_softc *sc, int sr, int isdac,
		      int *tcp, int *modep));
u_int sbdsp_jazz16_probe __P((struct sbdsp_softc *));
void sbdsp_set_mixer_gain __P((struct sbdsp_softc *sc, int port));

/*
 * Time constant routines follow.  See SBK, section 12.
 * Although they don't come out and say it (in the docs),
 * the card clearly uses a 1MHz countdown timer, as the
 * low-speed formula (p. 12-4) is:
 *	tc = 256 - 10^6 / sr
 * In high-speed mode, the constant is the upper byte of a 16-bit counter,
 * and a 256MHz clock is used:
 *	tc = 65536 - 256 * 10^ 6 / sr
 * Since we can only use the upper byte of the HS TC, the two formulae
 * are equivalent.  (Why didn't they say so?)  E.g.,
 * 	(65536 - 256 * 10 ^ 6 / x) >> 8 = 256 - 10^6 / x
 *
 * The crossover point (from low- to high-speed modes) is different
 * for the SBPRO and SB20.  The table on p. 12-5 gives the following data:
 *
 *				SBPRO			SB20
 *				-----			--------
 * input ls min			4	KHz		4	KHz
 * input ls max			23	KHz		13	KHz
 * input hs max			44.1	KHz		15	KHz
 * output ls min		4	KHz		4	KHz
 * output ls max		23	KHz		23	KHz
 * output hs max		44.1	KHz		44.1	KHz
 */
#define SB_LS_MIN	0x06	/* 4000 Hz */
#define	SB_8K		0x83	/* 8000 Hz */
#define SBPRO_ADC_LS_MAX	0xd4	/* 22727 Hz */
#define SBPRO_ADC_HS_MAX	0xea	/* 45454 Hz */
#define SBCLA_ADC_LS_MAX	0xb3	/* 12987 Hz */
#define SBCLA_ADC_HS_MAX	0xbd	/* 14925 Hz */
#define SB_DAC_LS_MAX	0xd4	/* 22727 Hz */
#define SB_DAC_HS_MAX	0xea	/* 45454 Hz */

int	sbdsp16_wait __P((struct sbdsp_softc *));
void	sbdsp_to __P((void *));
void	sbdsp_pause __P((struct sbdsp_softc *));
int	sbdsp16_setrate __P((struct sbdsp_softc *, int, int, int *));
int	sbdsp_tctosr __P((struct sbdsp_softc *, int));
int	sbdsp_set_timeconst __P((struct sbdsp_softc *, int));
int	sbdsp_set_in_ports __P((struct sbdsp_softc *, int));
void	sbdsp_set_ifilter __P((void *, int));
int	sbdsp_get_ifilter __P((void *));

#ifdef AUDIO_DEBUG
void sb_printsc __P((struct sbdsp_softc *));

void
sb_printsc(sc)
	struct sbdsp_softc *sc;
{
	int i;

	printf("open %d dmachan %d/%d/%d iobase 0x%x irq %d\n",
	    (int)sc->sc_open, sc->dmachan, sc->sc_drq8, sc->sc_drq16,
	    sc->sc_iobase, sc->sc_irq);
	printf("irate %d itc %d imode %d orate %d otc %d omode %d\n",
	    sc->sc_irate, sc->sc_itc, sc->sc_imode,
	    sc->sc_orate, sc->sc_otc, sc->sc_omode);
	printf("outport %u inport %u spkron %u nintr %lu\n",
	    sc->out_port, sc->in_port, sc->spkr_state, sc->sc_interrupts);
	printf("precision %u channels %d intr %p arg %p\n",
	    sc->sc_precision, sc->sc_channels, sc->sc_intr, sc->sc_arg);
	printf("gain:");
	for (i = 0; i < SB_NDEVS; i++)
		printf(" %u,%u", sc->gain[i][SB_LEFT], sc->gain[i][SB_RIGHT]);
	printf("\n");
}
#endif /* AUDIO_DEBUG */

/*
 * Probe / attach routines.
 */

/*
 * Probe for the soundblaster hardware.
 */
int
sbdsp_probe(sc)
	struct sbdsp_softc *sc;
{

	if (sbdsp_reset(sc) < 0) {
		DPRINTF(("sbdsp: couldn't reset card\n"));
		return 0;
	}
	/* if flags set, go and probe the jazz16 stuff */
	if (sc->sc_dev.dv_cfdata->cf_flags != 0) {
		sc->sc_model = sbdsp_jazz16_probe(sc);
	} else {
		sc->sc_model = sbversion(sc);
	}

	switch(SBVER_MAJOR((sc)->sc_model)) {
	default:
		sc->sc_mixer_model = SBM_NONE;
		break;
	case 2:
		/* Some SB2 have a mixer, some don't. */
		sbdsp_mix_write(sc, SBP_1335_MASTER_VOL, 0x04);
		sbdsp_mix_write(sc, SBP_1335_MIDI_VOL,   0x06);
		/* Check if we can read back the mixer values. */
		if (sbdsp_mix_read(sc, SBP_1335_MASTER_VOL) == 0x04 &&
		    sbdsp_mix_read(sc, SBP_1335_MIDI_VOL)   == 0x06)
			sc->sc_mixer_model = SBM_CT1335;
		else
			sc->sc_mixer_model = SBM_NONE;
		break;
	case 3:
		sc->sc_mixer_model = SBM_CT1345;
		break;
	case 4:
		sc->sc_mixer_model = SBM_CT1745;
		break;
	}
	if (ISJAZZ16(sc))
		sc->sc_mixer_model = SBM_CT1345; /* XXX really? */
	return 1;
}

/*
 * Try add-on stuff for Jazz16.
 */
u_int
sbdsp_jazz16_probe(sc)
	struct sbdsp_softc *sc;
{
	static u_char jazz16_irq_conf[16] = {
	    -1, -1, 0x02, 0x03,
	    -1, 0x01, -1, 0x04,
	    -1, 0x02, 0x05, -1,
	    -1, -1, -1, 0x06};
	static u_char jazz16_drq_conf[8] = {
	    -1, 0x01, -1, 0x02,
	    -1, 0x03, -1, 0x04};

	u_int rval = sbversion(sc);
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh;

	DPRINTF(("jazz16 probe\n"));

	if (bus_space_map(iot, JAZZ16_CONFIG_PORT, 1, 0, &ioh)) {
		DPRINTF(("bus map failed\n"));
		return rval;
	}

	if (jazz16_drq_conf[sc->sc_drq8] == (u_char)-1 ||
	    jazz16_irq_conf[sc->sc_irq] == (u_char)-1) {
		DPRINTF(("drq/irq check failed\n"));
		goto done;		/* give up, we can't do it. */
	}

	bus_space_write_1(iot, ioh, 0, JAZZ16_WAKEUP);
	delay(10000);			/* delay 10 ms */
	bus_space_write_1(iot, ioh, 0, JAZZ16_SETBASE);
	bus_space_write_1(iot, ioh, 0, sc->sc_iobase & 0x70);

	if (sbdsp_reset(sc) < 0) {
		DPRINTF(("sbdsp_reset check failed\n"));
		goto done;		/* XXX? what else could we do? */
	}

	if (sbdsp_wdsp(sc, JAZZ16_READ_VER)) {
		DPRINTF(("read16 setup failed\n"));
		goto done;
	}

	if (sbdsp_rdsp(sc) != JAZZ16_VER_JAZZ) {
		DPRINTF(("read16 failed\n"));
		goto done;
	}

	/* XXX set both 8 & 16-bit drq to same channel, it works fine. */
	sc->sc_drq16 = sc->sc_drq8;
	if (sbdsp_wdsp(sc, JAZZ16_SET_DMAINTR) ||
	    sbdsp_wdsp(sc, (jazz16_drq_conf[sc->sc_drq16] << 4) |
		jazz16_drq_conf[sc->sc_drq8]) ||
	    sbdsp_wdsp(sc, jazz16_irq_conf[sc->sc_irq])) {
		DPRINTF(("sbdsp: can't write jazz16 probe stuff\n"));
	} else {
		DPRINTF(("jazz16 detected!\n"));
		rval |= MODEL_JAZZ16;
	}

done:
	bus_space_unmap(iot, ioh, 1);
	return rval;
}

/*
 * Attach hardware to driver, attach hardware driver to audio
 * pseudo-device driver .
 */
void
sbdsp_attach(sc)
	struct sbdsp_softc *sc;
{
	struct audio_params xparams;
        int i;
        u_int v;

        sbdsp_set_params(sc, AUMODE_RECORD, &audio_default, &xparams);
        sbdsp_set_params(sc, AUMODE_PLAY,   &audio_default, &xparams);

	sbdsp_set_in_port(sc, SB_MIC_VOL);
	sbdsp_set_out_port(sc, SB_MASTER_VOL);

	if (sc->sc_mixer_model != SBM_NONE) {
        	/* Reset the mixer.*/
		sbdsp_mix_write(sc, SBP_MIX_RESET, SBP_MIX_RESET);
                /* And set our own default values */
		for (i = 0; i < SB_NDEVS; i++) {
			switch(i) {
			case SB_MIC_VOL:
			case SB_LINE_IN_VOL:
				v = 0;
				break;
			case SB_BASS:
			case SB_TREBLE:
				v = SB_ADJUST_GAIN(sc, AUDIO_MAX_GAIN/2);
				break;
			default:
				v = SB_ADJUST_GAIN(sc, AUDIO_MAX_GAIN * 3 / 4);
				break;
			}
			sc->gain[i][SB_LEFT] = sc->gain[i][SB_RIGHT] = v;
			sbdsp_set_mixer_gain(sc, i);
		}
		sc->in_filter = 0;	/* no filters turned on, please */
	}

	printf(": dsp v%d.%02d%s\n",
	       SBVER_MAJOR(sc->sc_model), SBVER_MINOR(sc->sc_model),
	       ISJAZZ16(sc) ? ": <Jazz16>" : "");
}

/*
 * Various routines to interface to higher level audio driver
 */

void
sbdsp_mix_write(sc, mixerport, val)
	struct sbdsp_softc *sc;
	int mixerport;
	int val;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;
	int s;

	s = splaudio();
	bus_space_write_1(iot, ioh, SBP_MIXER_ADDR, mixerport);
	delay(20);
	bus_space_write_1(iot, ioh, SBP_MIXER_DATA, val);
	delay(30);
	splx(s);
}

int
sbdsp_mix_read(sc, mixerport)
	struct sbdsp_softc *sc;
	int mixerport;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;
	int val;
	int s;

	s = splaudio();
	bus_space_write_1(iot, ioh, SBP_MIXER_ADDR, mixerport);
	delay(20);
	val = bus_space_read_1(iot, ioh, SBP_MIXER_DATA);
	delay(30);
	splx(s);
	return val;
}

int
sbdsp_query_encoding(addr, fp)
	void *addr;
	struct audio_encoding *fp;
{
	struct sbdsp_softc *sc = addr;

	switch (fp->index) {
	case 0:
		strcpy(fp->name, AudioEulinear);
		fp->encoding = AUDIO_ENCODING_ULINEAR;
		fp->precision = 8;
		fp->flags = 0;
		break;
	case 1:
		strcpy(fp->name, AudioEmulaw);
		fp->encoding = AUDIO_ENCODING_ULAW;
		fp->precision = 8;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 2:
		strcpy(fp->name, AudioElinear);
		fp->encoding = AUDIO_ENCODING_LINEAR;
		fp->precision = 8;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
        }
        if (!(ISSB16CLASS(sc) || ISJAZZ16(sc)))
		return EINVAL;

        switch(fp->index) {
        case 3:
		strcpy(fp->name, AudioElinear_le);
		fp->encoding = AUDIO_ENCODING_LINEAR_LE;
		fp->precision = 16;
		fp->flags = 0;
		break;
	case 4:
		strcpy(fp->name, AudioEulinear_le);
		fp->encoding = AUDIO_ENCODING_ULINEAR_LE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 5:
		strcpy(fp->name, AudioElinear_be);
		fp->encoding = AUDIO_ENCODING_LINEAR_BE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	case 6:
		strcpy(fp->name, AudioEulinear_be);
		fp->encoding = AUDIO_ENCODING_ULINEAR_BE;
		fp->precision = 16;
		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
		break;
	default:
		return EINVAL;
	}
	return 0;
}

int
sbdsp_set_params(addr, mode, p, q)
	void *addr;
	int mode;
	struct audio_params *p, *q;
{
	struct sbdsp_softc *sc = addr;
	int maxspeed;
	void (*swcode) __P((void *, u_char *buf, int cnt));
	int can16 = ISSB16CLASS(sc) || ISJAZZ16(sc);

	switch (p->encoding) {
	case AUDIO_ENCODING_LINEAR_LE:
		if (p->precision == 8)
			swcode = change_sign8;
		else if (can16)
			swcode = 0;
		else
			return EINVAL;
		break;
	case AUDIO_ENCODING_ULINEAR_LE:
		if (p->precision == 8)
			swcode = 0;
		else if (can16)
			swcode = change_sign16;
		else
			return EINVAL;
		break;
	case AUDIO_ENCODING_LINEAR_BE:
		if (p->precision == 8)
			swcode = change_sign8;
		else if (can16)
			swcode = swap_bytes;
		else
			return EINVAL;
		break;
	case AUDIO_ENCODING_ULINEAR_BE:
		if (p->precision == 8)
			swcode = 0;
		else if (can16)
			swcode = swap_bytes_change_sign16;
		else
			return EINVAL;
		break;
	case AUDIO_ENCODING_ULAW:
		swcode = mode == AUMODE_PLAY ?
			  mulaw_to_ulinear8 : ulinear8_to_mulaw;
		break;
	default:
		return EINVAL;
	}


	if (!ISSBPROCLASS(sc)) {
		/* v 1.x or v 2.x */
		if (mode == AUMODE_PLAY) {
			if (ISSB2CLASS(sc) && SBVER_MINOR(sc->sc_model) > 0)
				maxspeed = 45454;
			else
				maxspeed = 22727;
		} else
			maxspeed = 12987;
		if (p->sample_rate < 4000 || p->sample_rate > maxspeed)
			return EINVAL;
		if (p->channels != 1)
			return EINVAL;
	} else if (!can16) {
		/* v 3.x (SBPRO) */
		if (p->channels == 1)
			maxspeed = 45454;
		else
			maxspeed = 22727;
		if (p->sample_rate < 4000 || p->sample_rate > maxspeed)
			return EINVAL;
	} else {
		/* >= v 4.x */
		if (p->sample_rate < 4000 || p->sample_rate > 45000)
			return EINVAL;
	}

	if (ISSB16CLASS(sc)) {
		if (mode == AUMODE_RECORD)
			sc->sc_irate = p->sample_rate;
		else
			sc->sc_orate = p->sample_rate;
	} else {
		sbdsp_srtotc(sc, p->sample_rate, SB_OUTPUT_RATE,
			     &sc->sc_otc, &sc->sc_omode);
		p->sample_rate = sbdsp_tctosr(sc, sc->sc_otc);
	}

	sc->sc_precision = p->precision;
	sc->sc_channels = p->channels;

	p->sw_code = swcode;

	/* Update setting for the other mode. */
	q->encoding = p->encoding;
	q->channels = p->channels;
	q->precision = p->precision;

	/*
	 * XXX
	 * Should wait for chip to be idle.
	 */
	sc->sc_dmadir = SB_DMA_NONE;

	return 0;
}

void
sbdsp_set_ifilter(addr, which)
	void *addr;
	int which;
{
	register struct sbdsp_softc *sc = addr;
	int mixval;

	mixval = sbdsp_mix_read(sc, SBP_INFILTER) & ~SBP_IFILTER_MASK;
	switch (which) {
	case 0:
		mixval |= SBP_FILTER_OFF;
		break;
	case SB_TREBLE:
		mixval |= SBP_FILTER_ON | SBP_IFILTER_HIGH;
		break;
	case SB_BASS:
		mixval |= SBP_FILTER_ON | SBP_IFILTER_LOW;
		break;
	default:
		return;
	}
	sc->in_filter = mixval & SBP_IFILTER_MASK;
	sbdsp_mix_write(sc, SBP_INFILTER, mixval);
}

int
sbdsp_get_ifilter(addr)
	void *addr;
{
	register struct sbdsp_softc *sc = addr;

	sc->in_filter =
		sbdsp_mix_read(sc, SBP_INFILTER) & SBP_IFILTER_MASK;
	switch (sc->in_filter) {
	case SBP_FILTER_ON|SBP_IFILTER_HIGH:
		return SB_TREBLE;
	case SBP_FILTER_ON|SBP_IFILTER_LOW:
		return SB_BASS;
	default:
		return 0;
	}
}

int
sbdsp_set_out_port(addr, port)
	void *addr;
	int port;
{
	struct sbdsp_softc *sc = addr;

	sc->out_port = port; /* Just record it */

	return 0;
}

int
sbdsp_get_out_port(addr)
	void *addr;
{
	struct sbdsp_softc *sc = addr;

	return (sc->out_port);
}


int
sbdsp_set_in_port(addr, port)
	void *addr;
	int port;
{
	return sbdsp_set_in_ports(addr, 1 << port);
}

int
sbdsp_set_in_ports(sc, mask)
	struct sbdsp_softc *sc;
	int mask;
{
	int bitsl, bitsr;
	int sbport;
	int i;

	switch(sc->sc_mixer_model) {
	case SBM_NONE:
		return EINVAL;
	case SBM_CT1335:
		if (mask != (1 << SB_MIC_VOL))
			return EINVAL;
		break;
	case SBM_CT1345:
		switch (mask) {
		case 1 << SB_MIC_VOL:
			sbport = SBP_FROM_MIC;
			break;
		case 1 << SB_LINE_IN_VOL:
			sbport = SBP_FROM_LINE;
			break;
		case 1 << SB_CD_VOL:
			sbport = SBP_FROM_CD;
			break;
		default:
			return EINVAL;
		}
		sbdsp_mix_write(sc, SBP_RECORD_SOURCE,
		    SBP_RECORD_FROM(sbport, SBP_FILTER_OFF, SBP_IFILTER_HIGH));
		break;
	case SBM_CT1745:
		if (mask & ~((1<<SB_MIDI_VOL) | (1<<SB_LINE_IN_VOL) |
			     (1<<SB_CD_VOL) | (1<<SB_MIC_VOL)))
			return EINVAL;
		bitsr = 0;
		if (mask & SB_MIDI_VOL)    bitsr |= SBP_MIDI_SRC_R;
		if (mask & SB_LINE_IN_VOL) bitsr |= SBP_LINE_SRC_R;
		if (mask & SB_CD_VOL)      bitsr |= SBP_CD_SRC_R;
		bitsl = SB_SRC_R_TO_L(bitsr);
		if (mask & SB_MIC_VOL) {
			bitsl |= SBP_MIC_SRC;
			bitsr |= SBP_MIC_SRC;
		}
		sbdsp_mix_write(sc, SBP_RECORD_SOURCE_L, bitsl);
		sbdsp_mix_write(sc, SBP_RECORD_SOURCE_R, bitsr);
		break;
	}

	sc->in_mask = mask;

	/* XXX
	 * We have to fake a single port since the upper layer
	 * expects one.
	 */
	for(i = 0; i < SB_NPORT; i++) {
		if (mask & (1 << i)) {
			sc->in_port = i;
			break;
		}
	}
	return 0;
}

int
sbdsp_get_in_port(addr)
	void *addr;
{
	struct sbdsp_softc *sc = addr;

	return sc->in_port;
}


int
sbdsp_speaker_ctl(addr, newstate)
	void *addr;
	int newstate;
{
	struct sbdsp_softc *sc = addr;

	if ((newstate == SPKR_ON) &&
	    (sc->spkr_state == SPKR_OFF)) {
		sbdsp_spkron(sc);
		sc->spkr_state = SPKR_ON;
	}
	if ((newstate == SPKR_OFF) &&
	    (sc->spkr_state == SPKR_ON)) {
		sbdsp_spkroff(sc);
		sc->spkr_state = SPKR_OFF;
	}
	return(0);
}

int
sbdsp_round_blocksize(addr, blk)
	void *addr;
	int blk;
{
	struct sbdsp_softc *sc = addr;

	sc->sc_last_hs_size = 0;

	/* Don't try to DMA too much at once. */
	if (blk > NBPG)
		blk = NBPG;

	/* Round to a multiple of the sample size. */
	blk &= -(sc->sc_channels * sc->sc_precision / 8);

	if (blk > 1364)
		blk = 1364;	/* XXX allow at least 3 blocks */

	return (blk);
}

int
sbdsp_commit_settings(addr)
	void *addr;
{
	return 0;
}

int
sbdsp_open(sc, dev, flags)
	register struct sbdsp_softc *sc;
	dev_t dev;
	int flags;
{
        DPRINTF(("sbdsp_open: sc=0x%x\n", sc));

	if (sc->sc_open != 0 || sbdsp_reset(sc) != 0)
		return ENXIO;

	sc->sc_open = 1;
	sc->sc_mintr = 0;
	if (ISSBPROCLASS(sc) &&
	    sbdsp_wdsp(sc, SB_DSP_RECORD_MONO) < 0) {
		DPRINTF(("sbdsp_open: can't set mono mode\n"));
		/* we'll readjust when it's time for DMA. */
	}

	/*
	 * Leave most things as they were; users must change things if
	 * the previous process didn't leave it they way they wanted.
	 * Looked at another way, it's easy to set up a configuration
	 * in one program and leave it for another to inherit.
	 */
	DPRINTF(("sbdsp_open: opened\n"));

	return 0;
}

void
sbdsp_close(addr)
	void *addr;
{
	struct sbdsp_softc *sc = addr;

        DPRINTF(("sbdsp_close: sc=0x%x\n", sc));

	sc->sc_open = 0;
	sbdsp_spkroff(sc);
	sc->spkr_state = SPKR_OFF;
	sc->sc_mintr = 0;
	sbdsp_haltdma(sc);

	DPRINTF(("sbdsp_close: closed\n"));
}

/*
 * Lower-level routines
 */

/*
 * Reset the card.
 * Return non-zero if the card isn't detected.
 */
int
sbdsp_reset(sc)
	register struct sbdsp_softc *sc;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;

	sc->sc_intr = 0;
	if (sc->sc_dmadir != SB_DMA_NONE) {
		isa_dmaabort(sc->dmachan);
		sc->sc_dmadir = SB_DMA_NONE;
	}
	sc->sc_last_hs_size = 0;

	/*
	 * See SBK, section 11.3.
	 * We pulse a reset signal into the card.
	 * Gee, what a brilliant hardware design.
	 */
	bus_space_write_1(iot, ioh, SBP_DSP_RESET, 1);
	delay(10);
	bus_space_write_1(iot, ioh, SBP_DSP_RESET, 0);
	delay(30);
	if (sbdsp_rdsp(sc) != SB_MAGIC)
		return -1;

	return 0;
}

int
sbdsp16_wait(sc)
	struct sbdsp_softc *sc;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;
	register int i;

	for (i = SBDSP_NPOLL; --i >= 0; ) {
		register u_char x;
		x = bus_space_read_1(iot, ioh, SBP_DSP_WSTAT);
		delay(10);
		if ((x & SB_DSP_BUSY) == 0)
			continue;
		return 0;
	}
	++sberr.wdsp;
	return -1;
}

/*
 * Write a byte to the dsp.
 * XXX We are at the mercy of the card as we use a
 * polling loop and wait until it can take the byte.
 */
int
sbdsp_wdsp(sc, v)
	struct sbdsp_softc *sc;
	int v;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;
	register int i;

	for (i = SBDSP_NPOLL; --i >= 0; ) {
		register u_char x;
		x = bus_space_read_1(iot, ioh, SBP_DSP_WSTAT);
		delay(10);
		if ((x & SB_DSP_BUSY) != 0)
			continue;
		bus_space_write_1(iot, ioh, SBP_DSP_WRITE, v);
		delay(10);
		return 0;
	}
	++sberr.wdsp;
	return -1;
}

/*
 * Read a byte from the DSP, using polling.
 */
int
sbdsp_rdsp(sc)
	struct sbdsp_softc *sc;
{
	bus_space_tag_t iot = sc->sc_iot;
	bus_space_handle_t ioh = sc->sc_ioh;
	register int i;

	for (i = SBDSP_NPOLL; --i >= 0; ) {
		register u_char x;
		x = bus_space_read_1(iot, ioh, SBP_DSP_RSTAT);
		delay(10);
		if ((x & SB_DSP_READY) == 0)
			continue;
		x = bus_space_read_1(iot, ioh, SBP_DSP_READ);
		delay(10);
		return x;
	}
	++sberr.rdsp;
	return -1;
}

/*
 * Doing certain things (like toggling the speaker) make
 * the SB hardware go away for a while, so pause a little.
 */
void
sbdsp_to(arg)
	void *arg;
{
	wakeup(arg);
}

void
sbdsp_pause(sc)
	struct sbdsp_softc *sc;
{
	extern int hz;

	timeout(sbdsp_to, sbdsp_to, hz/8);
	(void)tsleep(sbdsp_to, PWAIT, "sbpause", 0);
}

/*
 * Turn on the speaker.  The SBK documention says this operation
 * can take up to 1/10 of a second.  Higher level layers should
 * probably let the task sleep for this amount of time after
 * calling here.  Otherwise, things might not work (because
 * sbdsp_wdsp() and sbdsp_rdsp() will probably timeout.)
 *
 * These engineers had their heads up their ass when
 * they designed this card.
 */
void
sbdsp_spkron(sc)
	struct sbdsp_softc *sc;
{
	(void)sbdsp_wdsp(sc, SB_DSP_SPKR_ON);
	sbdsp_pause(sc);
}

/*
 * Turn off the speaker; see comment above.
 */
void
sbdsp_spkroff(sc)
	struct sbdsp_softc *sc;
{
	(void)sbdsp_wdsp(sc, SB_DSP_SPKR_OFF);
	sbdsp_pause(sc);
}

/*
 * Read the version number out of the card.  Return major code
 * in high byte, and minor code in low byte.
 */
short
sbversion(sc)
	struct sbdsp_softc *sc;
{
	short v;

	if (sbdsp_wdsp(sc, SB_DSP_VERSION) < 0)
		return 0;
	v = sbdsp_rdsp(sc) << 8;
	v |= sbdsp_rdsp(sc);
	return ((v >= 0) ? v : 0);
}

/*
 * Halt a DMA in progress.  A low-speed transfer can be
 * resumed with sbdsp_contdma().
 */
int
sbdsp_haltdma(addr)
	void *addr;
{
	register struct sbdsp_softc *sc = addr;

	DPRINTF(("sbdsp_haltdma: sc=0x%x\n", sc));

	sbdsp_reset(sc);
	return 0;
}

int
sbdsp_contdma(addr)
	void *addr;
{
	register struct sbdsp_softc *sc = addr;

	DPRINTF(("sbdsp_contdma: sc=0x%x\n", sc));

	/* XXX how do we reinitialize the DMA controller state?  do we care? */
	(void)sbdsp_wdsp(sc, SB_DSP_CONT);
	return(0);
}

/*
 * Convert a linear sampling rate into the DAC time constant.
 * Set *mode to indicate the high/low-speed DMA operation.
 * Because of limitations of the card, not all rates are possible.
 * We return the time constant of the closest possible rate.
 * The sampling rate limits are different for the DAC and ADC,
 * so isdac indicates output, and !isdac indicates input.
 */
void
sbdsp_srtotc(sc, sr, isdac, tcp, modep)
	register struct sbdsp_softc *sc;
	int sr;
	int isdac;
	int *tcp, *modep;
{
	int tc, realtc, mode;

	/*
	 * Don't forget to compute which mode we'll be in based on whether
	 * we need to double the rate for stereo on SBPRO.
	 */

	if (sr == 0) {
		tc = SB_LS_MIN;
		mode = SB_ADAC_LS;
		goto out;
	}

	tc = 256 - (1000000 / sr);

	if (sc->sc_channels == 2 && ISSBPRO(sc))
		/* compute based on 2x sample rate when needed */
		realtc = 256 - ( 500000 / sr);
	else
		realtc = tc;

	if (tc < SB_LS_MIN) {
		tc = SB_LS_MIN;
		mode = SB_ADAC_LS;	/* NB: 2x minimum speed is still low
					 * speed mode. */
		goto out;
	} else if (isdac) {
		if (realtc <= SB_DAC_LS_MAX)
			mode = SB_ADAC_LS;
		else {
			mode = SB_ADAC_HS;
			if (tc > SB_DAC_HS_MAX)
				tc = SB_DAC_HS_MAX;
		}
	} else {
		int adc_ls_max, adc_hs_max;

		/* XXX use better rounding--compare distance to nearest tc on both
		   sides of requested speed */
		if (ISSBPROCLASS(sc)) {
			adc_ls_max = SBPRO_ADC_LS_MAX;
			adc_hs_max = SBPRO_ADC_HS_MAX;
		} else {
			adc_ls_max = SBCLA_ADC_LS_MAX;
			adc_hs_max = SBCLA_ADC_HS_MAX;
		}

		if (realtc <= adc_ls_max)
			mode = SB_ADAC_LS;
		else {
			mode = SB_ADAC_HS;
			if (tc > adc_hs_max)
				tc = adc_hs_max;
		}
	}

out:
	*tcp = tc;
	*modep = mode;
}

/*
 * Convert a DAC time constant to a sampling rate.
 * See SBK, section 12.
 */
int
sbdsp_tctosr(sc, tc)
	register struct sbdsp_softc *sc;
	int tc;
{
	int adc;

	if (ISSBPROCLASS(sc))
		adc = SBPRO_ADC_HS_MAX;
	else
		adc = SBCLA_ADC_HS_MAX;

	if (tc > adc)
		tc = adc;

	return (1000000 / (256 - tc));
}

int
sbdsp_set_timeconst(sc, tc)
	register struct sbdsp_softc *sc;
	int tc;
{
	/*
	 * A SBPro in stereo mode uses time constants at double the
	 * actual rate.
	 */
	if (ISSBPRO(sc) && sc->sc_channels == 2)
		tc = 256 - ((256 - tc) / 2);

	DPRINTF(("sbdsp_set_timeconst: sc=%p tc=%d\n", sc, tc));

	if (sbdsp_wdsp(sc, SB_DSP_TIMECONST) < 0 ||
	    sbdsp_wdsp(sc, tc) < 0)
		return (EIO);

	return (0);
}

int
sbdsp_dma_input(addr, p, cc, intr, arg)
	void *addr;
	void *p;
	int cc;
	void (*intr) __P((void *));
	void *arg;
{
	register struct sbdsp_softc *sc = addr;

#ifdef AUDIO_DEBUG
	if (sbdspdebug > 1)
		Dprintf("sbdsp_dma_input: cc=%d 0x%x (0x%x)\n", cc, intr, arg);
#endif
	if (sc->sc_channels == 2 && (cc & 1)) {
		DPRINTF(("sbdsp_dma_input: stereo input, odd bytecnt\n"));
		return EIO;
	}

	if (sc->sc_dmadir != SB_DMA_IN) {
		if (ISSBPRO(sc)) {
			if (sc->sc_channels == 2) {
				if (ISJAZZ16(sc) && sc->sc_precision == 16) {
					if (sbdsp_wdsp(sc,
						       JAZZ16_RECORD_STEREO) < 0) {
						goto badmode;
					}
				} else if (sbdsp_wdsp(sc,
						      SB_DSP_RECORD_STEREO) < 0)
					goto badmode;
				sbdsp_mix_write(sc, SBP_INFILTER,
				    (sbdsp_mix_read(sc, SBP_INFILTER) &
				    ~SBP_IFILTER_MASK) | SBP_FILTER_OFF);
			} else {
				if (ISJAZZ16(sc) && sc->sc_precision == 16) {
					if (sbdsp_wdsp(sc,
						       JAZZ16_RECORD_MONO) < 0)
					{
						goto badmode;
					}
				} else if (sbdsp_wdsp(sc, SB_DSP_RECORD_MONO) < 0)
					goto badmode;
				sbdsp_mix_write(sc, SBP_INFILTER,
				    (sbdsp_mix_read(sc, SBP_INFILTER) &
				    ~SBP_IFILTER_MASK) | sc->in_filter);
			}
		}

		if (ISSB16CLASS(sc)) {
			if (sbdsp_wdsp(sc, SB_DSP16_INPUTRATE) < 0 ||
			    sbdsp_wdsp(sc, sc->sc_irate >> 8) < 0 ||
			    sbdsp_wdsp(sc, sc->sc_irate) < 0)
				goto giveup;
		} else
			sbdsp_set_timeconst(sc, sc->sc_itc);

		sc->sc_dmadir = SB_DMA_IN;
		sc->dmaflags = DMAMODE_READ;
		if (ISSB2CLASS(sc))
			sc->dmaflags |= DMAMODE_LOOP;
	} else {
		/* Already started; just return. */
		if (ISSB2CLASS(sc))
			return 0;
	}

	sc->dmaaddr = p;
	sc->dmacnt = ISSB2CLASS(sc) ? (NBPG/cc)*cc : cc;
	sc->dmachan = sc->sc_precision == 16 ? sc->sc_drq16 : sc->sc_drq8;
	isa_dmastart(sc->dmaflags, sc->dmaaddr, sc->dmacnt, sc->dmachan);
	sc->sc_intr = intr;
	sc->sc_arg = arg;

	if (sc->sc_precision == 16)
		cc >>= 1;
	--cc;
	if (ISSB16CLASS(sc)) {
		if (sbdsp_wdsp(sc, sc->sc_precision == 16 ? SB_DSP16_RDMA_16 :
							    SB_DSP16_RDMA_8) < 0 ||
		    sbdsp_wdsp(sc, (sc->sc_precision == 16 ? 0x10 : 0x00) |
				       (sc->sc_channels == 2 ? 0x20 : 0x00)) < 0 ||
		    sbdsp16_wait(sc) ||
		    sbdsp_wdsp(sc, cc) < 0 ||
		    sbdsp_wdsp(sc, cc >> 8) < 0) {
			DPRINTF(("sbdsp_dma_input: SB16 DMA start failed\n"));
			goto giveup;
		}
	} else if (ISSB2CLASS(sc)) {
		if (cc != sc->sc_last_hs_size) {
			if (sbdsp_wdsp(sc, SB_DSP_BLOCKSIZE) < 0 ||
			    sbdsp_wdsp(sc, cc) < 0 ||
			    sbdsp_wdsp(sc, cc >> 8) < 0) {
				DPRINTF(("sbdsp_dma_input: SB2 DMA start failed\n"));
				goto giveup;
			}
			sc->sc_last_hs_size = cc;
		}
		if (sbdsp_wdsp(sc,
		    sc->sc_imode == SB_ADAC_LS ? SB_DSP_RDMA_LOOP :
						 SB_DSP_HS_INPUT) < 0) {
			DPRINTF(("sbdsp_dma_input: SB2 DMA restart failed\n"));
			goto giveup;
		}
	} else {
		if (sbdsp_wdsp(sc, SB_DSP_RDMA) < 0 ||
		    sbdsp_wdsp(sc, cc) < 0 ||
		    sbdsp_wdsp(sc, cc >> 8) < 0) {
		        DPRINTF(("sbdsp_dma_input: SB1 DMA start failed\n"));
			goto giveup;
		}
	}
	return 0;

giveup:
	sbdsp_reset(sc);
	return EIO;

badmode:
	DPRINTF(("sbdsp_dma_input: can't set %s mode\n",
		 sc->sc_channels == 2 ? "stereo" : "mono"));
	return EIO;
}

int
sbdsp_dma_output(addr, p, cc, intr, arg)
	void *addr;
	void *p;
	int cc;
	void (*intr) __P((void *));
	void *arg;
{
	register struct sbdsp_softc *sc = addr;

#ifdef AUDIO_DEBUG
	if (sbdspdebug > 1)
		Dprintf("sbdsp_dma_output: cc=%d 0x%x (0x%x)\n", cc, intr, arg);
#endif
	if (sc->sc_channels == 2 && (cc & 1)) {
		DPRINTF(("stereo playback odd bytes (%d)\n", cc));
		return EIO;
	}

	if (sc->sc_dmadir != SB_DMA_OUT) {
		if (ISSBPRO(sc)) {
			/* make sure we re-set stereo mixer bit when we start
			   output. */
			sbdsp_mix_write(sc, SBP_STEREO,
			    (sbdsp_mix_read(sc, SBP_STEREO) & ~SBP_PLAYMODE_MASK) |
			    (sc->sc_channels == 2 ?  SBP_PLAYMODE_STEREO : SBP_PLAYMODE_MONO));
			if (ISJAZZ16(sc)) {
				/* Yes, we write the record mode to set
				   16-bit playback mode. weird, huh? */
				if (sc->sc_precision == 16) {
					sbdsp_wdsp(sc,
						   sc->sc_channels == 2 ?
						   JAZZ16_RECORD_STEREO :
						   JAZZ16_RECORD_MONO);
				} else {
					sbdsp_wdsp(sc,
						   sc->sc_channels == 2 ?
						   SB_DSP_RECORD_STEREO :
						   SB_DSP_RECORD_MONO);
				}
			}
		}

		if (ISSB16CLASS(sc)) {
			if (sbdsp_wdsp(sc, SB_DSP16_OUTPUTRATE) < 0 ||
			    sbdsp_wdsp(sc, sc->sc_orate >> 8) < 0 ||
			    sbdsp_wdsp(sc, sc->sc_orate) < 0)
				goto giveup;
		} else
			sbdsp_set_timeconst(sc, sc->sc_otc);

		sc->sc_dmadir = SB_DMA_OUT;
		sc->dmaflags = DMAMODE_WRITE;
		if (ISSB2CLASS(sc))
			sc->dmaflags |= DMAMODE_LOOP;
	} else {
		/* Already started; just return. */
		if (ISSB2CLASS(sc))
			return 0;
	}

	sc->dmaaddr = p;
	sc->dmacnt = ISSB2CLASS(sc) ? (NBPG/cc)*cc : cc;
	sc->dmachan = sc->sc_precision == 16 ? sc->sc_drq16 : sc->sc_drq8;
	isa_dmastart(sc->dmaflags, sc->dmaaddr, sc->dmacnt, sc->dmachan);
	sc->sc_intr = intr;
	sc->sc_arg = arg;

	if (sc->sc_precision == 16)
		cc >>= 1;
	--cc;
	if (ISSB16CLASS(sc)) {
		if (sbdsp_wdsp(sc, sc->sc_precision == 16 ? SB_DSP16_WDMA_16 :
							    SB_DSP16_WDMA_8) < 0 ||
		    sbdsp_wdsp(sc, (sc->sc_precision == 16 ? 0x10 : 0x00) |
				       (sc->sc_channels == 2 ? 0x20 : 0x00)) < 0 ||
		    sbdsp16_wait(sc) ||
		    sbdsp_wdsp(sc, cc) < 0 ||
		    sbdsp_wdsp(sc, cc >> 8) < 0) {
			DPRINTF(("sbdsp_dma_output: SB16 DMA start failed\n"));
			goto giveup;
		}
	} else if (ISSB2CLASS(sc)) {
		if (cc != sc->sc_last_hs_size) {
			if (sbdsp_wdsp(sc, SB_DSP_BLOCKSIZE) < 0 ||
			    sbdsp_wdsp(sc, cc) < 0 ||
			    sbdsp_wdsp(sc, cc >> 8) < 0) {
				DPRINTF(("sbdsp_dma_output: SB2 DMA start failed\n"));
				goto giveup;
			}
			sc->sc_last_hs_size = cc;
		}
		if (sbdsp_wdsp(sc,
		    sc->sc_omode == SB_ADAC_LS ? SB_DSP_WDMA_LOOP :
						 SB_DSP_HS_OUTPUT) < 0) {
			DPRINTF(("sbdsp_dma_output: SB2 DMA restart failed\n"));
			goto giveup;
		}
	} else {
		if (sbdsp_wdsp(sc, SB_DSP_WDMA) < 0 ||
		    sbdsp_wdsp(sc, cc) < 0 ||
		    sbdsp_wdsp(sc, cc >> 8) < 0) {
		        DPRINTF(("sbdsp_dma_output: SB1 DMA start failed\n"));
			goto giveup;
		}
	}
	return 0;

giveup:
	sbdsp_reset(sc);
	return EIO;
}

/*
 * Only the DSP unit on the sound blaster generates interrupts.
 * There are three cases of interrupt: reception of a midi byte
 * (when mode is enabled), completion of dma transmission, or
 * completion of a dma reception.  The three modes are mutually
 * exclusive so we know a priori which event has occurred.
 */
int
sbdsp_intr(arg)
	void *arg;
{
	register struct sbdsp_softc *sc = arg;
	u_char x;

#ifdef AUDIO_DEBUG
	if (sbdspdebug > 1)
		Dprintf("sbdsp_intr: intr=0x%x\n", sc->sc_intr);
#endif
	if (ISSB16CLASS(sc)) {
		x = sbdsp_mix_read(sc, SBP_IRQ_STATUS);
		if ((x & 3) == 0)
			return 0;
	} else {
		if (!isa_dmafinished(sc->dmachan))
			return 0;
	}
	sc->sc_interrupts++;
	delay(10);
#if 0
	if (sc->sc_mintr != 0) {
		x = sbdsp_rdsp(sc);
		(*sc->sc_mintr)(sc->sc_arg, x);
	} else
#endif
	if (sc->sc_intr != 0) {
		/* clear interrupt */
		bus_space_read_1(sc->sc_iot, sc->sc_ioh,
		    sc->sc_precision == 16 ? SBP_DSP_IRQACK16 :
					     SBP_DSP_IRQACK8);
		if (!ISSB2CLASS(sc))
			isa_dmadone(sc->dmaflags, sc->dmaaddr, sc->dmacnt,
			    sc->dmachan);
		(*sc->sc_intr)(sc->sc_arg);
	} else {
		return 0;
	}
	return 1;
}

#if 0
/*
 * Enter midi uart mode and arrange for read interrupts
 * to vector to `intr'.  This puts the card in a mode
 * which allows only midi I/O; the card must be reset
 * to leave this mode.  Unfortunately, the card does not
 * use transmit interrupts, so bytes must be output
 * using polling.  To keep the polling overhead to a
 * minimum, output should be driven off a timer.
 * This is a little tricky since only 320us separate
 * consecutive midi bytes.
 */
void
sbdsp_set_midi_mode(sc, intr, arg)
	struct sbdsp_softc *sc;
	void (*intr)();
	void *arg;
{

	sbdsp_wdsp(sc, SB_MIDI_UART_INTR);
	sc->sc_mintr = intr;
	sc->sc_intr = 0;
	sc->sc_arg = arg;
}

/*
 * Write a byte to the midi port, when in midi uart mode.
 */
void
sbdsp_midi_output(sc, v)
	struct sbdsp_softc *sc;
	int v;
{

	if (sbdsp_wdsp(sc, v) < 0)
		++sberr.wmidi;
}
#endif

int
sbdsp_setfd(addr, flag)
	void *addr;
	int flag;
{
	/* Can't do full-duplex */
	return(ENOTTY);
}

void
sbdsp_set_mixer_gain(sc, port)
	struct sbdsp_softc *sc;
	int port;
{
	int src, gain;

	switch(sc->sc_mixer_model) {
	case SBM_NONE:
		return;
	case SBM_CT1335:
		gain = SB_1335_GAIN(sc->gain[port][SB_LEFT]);
		switch(port) {
		case SB_MASTER_VOL:
			src = SBP_1335_MASTER_VOL;
			break;
		case SB_MIDI_VOL:
			src = SBP_1335_MIDI_VOL;
			break;
		case SB_CD_VOL:
			src = SBP_1335_CD_VOL;
			break;
		case SB_VOICE_VOL:
			src = SBP_1335_VOICE_VOL;
			gain = SB_1335_MASTER_GAIN(sc->gain[port][SB_LEFT]);
			break;
		default:
			return;
		}
		sbdsp_mix_write(sc, src, gain);
		break;
	case SBM_CT1345:
		gain = SB_STEREO_GAIN(sc->gain[port][SB_LEFT],
				      sc->gain[port][SB_RIGHT]);
		switch (port) {
		case SB_MIC_VOL:
			src = SBP_MIC_VOL;
			gain = SB_MIC_GAIN(sc->gain[port][SB_LEFT]);
			break;
		case SB_MASTER_VOL:
			src = SBP_MASTER_VOL;
			break;
		case SB_LINE_IN_VOL:
			src = SBP_LINE_VOL;
			break;
		case SB_VOICE_VOL:
			src = SBP_VOICE_VOL;
			break;
		case SB_MIDI_VOL:
			src = SBP_MIDI_VOL;
			break;
		case SB_CD_VOL:
			src = SBP_CD_VOL;
			break;
		default:
			return;
		}
		sbdsp_mix_write(sc, src, gain);
		break;
	case SBM_CT1745:
		switch (port) {
		case SB_MIC_VOL:
			src = SB16P_MIC_L;
			break;
		case SB_MASTER_VOL:
			src = SB16P_MASTER_L;
			break;
		case SB_LINE_IN_VOL:
			src = SB16P_LINE_L;
			break;
		case SB_VOICE_VOL:
			src = SB16P_VOICE_L;
			break;
		case SB_MIDI_VOL:
			src = SB16P_MIDI_L;
			break;
		case SB_CD_VOL:
			src = SB16P_CD_L;
			break;
		case SB_INPUT_GAIN:
			src = SB16P_INPUT_GAIN_L;
			break;
		case SB_OUTPUT_GAIN:
			src = SB16P_OUTPUT_GAIN_L;
			break;
		case SB_TREBLE:
			src = SB16P_TREBLE_L;
			break;
		case SB_BASS:
			src = SB16P_BASS_L;
			break;
		case SB_PCSPEAKER:
			sbdsp_mix_write(sc, SB16P_PCSPEAKER, sc->gain[port][SB_LEFT]);
			return;
		default:
			return;
		}
		sbdsp_mix_write(sc, src, sc->gain[port][SB_LEFT]);
		sbdsp_mix_write(sc, SB16P_L_TO_R(src), sc->gain[port][SB_RIGHT]);
		break;
	}
}

int
sbdsp_mixer_set_port(addr, cp)
	void *addr;
	mixer_ctrl_t *cp;
{
	register struct sbdsp_softc *sc = addr;
	int lgain, rgain;

	DPRINTF(("sbdsp_mixer_set_port: port=%d num_channels=%d\n", cp->dev,
	    cp->un.value.num_channels));

	if (sc->sc_mixer_model == SBM_NONE)
		return EINVAL;

	switch (cp->dev) {
	case SB_TREBLE:
	case SB_BASS:
		if (sc->sc_mixer_model == SBM_CT1345) {
			if (cp->type != AUDIO_MIXER_ENUM)
				return EINVAL;
			switch (cp->dev) {
			case SB_TREBLE:
				sbdsp_set_ifilter(addr, cp->un.ord ? SB_TREBLE : 0);
				return 0;
			case SB_BASS:
				sbdsp_set_ifilter(addr, cp->un.ord ? SB_BASS : 0);
				return 0;
			}
		}
	case SB_PCSPEAKER:
	case SB_INPUT_GAIN:
	case SB_OUTPUT_GAIN:
		if (sc->sc_mixer_model != SBM_CT1745)
			return EINVAL;
	case SB_MIC_VOL:
	case SB_LINE_IN_VOL:
		if (sc->sc_mixer_model == SBM_CT1335)
			return EINVAL;
	case SB_VOICE_VOL:
	case SB_MIDI_VOL:
	case SB_CD_VOL:
	case SB_MASTER_VOL:
		if (cp->type != AUDIO_MIXER_VALUE)
			return EINVAL;

		/*
		 * All the mixer ports are stereo except for the microphone.
		 * If we get a single-channel gain value passed in, then we
		 * duplicate it to both left and right channels.
		 */

		switch (cp->dev) {
		case SB_MIC_VOL:
			if (cp->un.value.num_channels != 1)
				return EINVAL;

			lgain = rgain = SB_ADJUST_MIC_GAIN(sc,
			  cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
			break;
		case SB_PCSPEAKER:
			if (cp->un.value.num_channels != 1)
				return EINVAL;
			/* fall into */
		case SB_INPUT_GAIN:
		case SB_OUTPUT_GAIN:
			lgain = rgain = SB_ADJUST_2_GAIN(sc,
			  cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
			break;
		default:
			switch (cp->un.value.num_channels) {
			case 1:
				lgain = rgain = SB_ADJUST_GAIN(sc,
				  cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
				break;
			case 2:
				if (sc->sc_mixer_model == SBM_CT1335)
					return EINVAL;
				lgain = SB_ADJUST_GAIN(sc,
				  cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT]);
				rgain = SB_ADJUST_GAIN(sc,
				  cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
				break;
			default:
				return EINVAL;
			}
			break;
		}
		sc->gain[cp->dev][SB_LEFT]  = lgain;
		sc->gain[cp->dev][SB_RIGHT] = rgain;

		sbdsp_set_mixer_gain(sc, cp->dev);
		break;

	case SB_RECORD_SOURCE:
		if (sc->sc_mixer_model == SBM_CT1745) {
			if (cp->type != AUDIO_MIXER_SET)
				return EINVAL;
			return sbdsp_set_in_ports(sc, cp->un.mask);
		} else {
			if (cp->type != AUDIO_MIXER_ENUM)
				return EINVAL;
			return sbdsp_set_in_port(sc, cp->un.ord);
		}
		break;

	case SB_AGC:
		if (sc->sc_mixer_model != SBM_CT1745 || cp->type != AUDIO_MIXER_ENUM)
			return EINVAL;
		sbdsp_mix_write(sc, SB16P_AGC, cp->un.ord & 1);
		break;

	default:
		return EINVAL;
	}

	return 0;
}

int
sbdsp_mixer_get_port(addr, cp)
	void *addr;
	mixer_ctrl_t *cp;
{
	register struct sbdsp_softc *sc = addr;

	DPRINTF(("sbdsp_mixer_get_port: port=%d\n", cp->dev));

	if (sc->sc_mixer_model == SBM_NONE)
		return EINVAL;

	switch (cp->dev) {
	case SB_TREBLE:
	case SB_BASS:
		if (sc->sc_mixer_model == SBM_CT1345) {
			switch (cp->dev) {
			case SB_TREBLE:
				cp->un.ord = sbdsp_get_ifilter(addr) == SB_TREBLE;
				return 0;
			case SB_BASS:
				cp->un.ord = sbdsp_get_ifilter(addr) == SB_BASS;
				return 0;
			}
		}
	case SB_PCSPEAKER:
	case SB_INPUT_GAIN:
	case SB_OUTPUT_GAIN:
		if (sc->sc_mixer_model != SBM_CT1745)
			return EINVAL;
	case SB_MIC_VOL:
	case SB_LINE_IN_VOL:
		if (sc->sc_mixer_model == SBM_CT1335)
			return EINVAL;
	case SB_VOICE_VOL:
	case SB_MIDI_VOL:
	case SB_CD_VOL:
	case SB_MASTER_VOL:
		switch (cp->dev) {
		case SB_MIC_VOL:
		case SB_PCSPEAKER:
			if (cp->un.value.num_channels != 1)
				return EINVAL;
			/* fall into */
		default:
			switch (cp->un.value.num_channels) {
			case 1:
				cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] =
					sc->gain[cp->dev][SB_LEFT];
				break;
			case 2:
				cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT] =
					sc->gain[cp->dev][SB_LEFT];
				cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] =
					sc->gain[cp->dev][SB_RIGHT];
				break;
			default:
				return EINVAL;
			}
			break;
		}
		break;

	case SB_RECORD_SOURCE:
		if (sc->sc_mixer_model == SBM_CT1745)
			cp->un.mask = sc->in_mask;
		else
			cp->un.ord = sc->in_port;
		break;

	case SB_AGC:
		if (sc->sc_mixer_model != SBM_CT1745)
			return EINVAL;
		cp->un.ord = sbdsp_mix_read(sc, SB16P_AGC);
		break;

	default:
		return EINVAL;
	}

	return (0);
}

int
sbdsp_mixer_query_devinfo(addr, dip)
	void *addr;
	mixer_devinfo_t *dip;
{
	struct sbdsp_softc *sc = addr;
	int chan, class;

	DPRINTF(("sbdsp_mixer_query_devinfo: index=%d\n", dip->index));

	if (sc->sc_mixer_model == SBM_NONE)
		return ENXIO;

	chan = sc->sc_mixer_model == SBM_CT1335 ? 1 : 2;
	class = sc->sc_mixer_model == SBM_CT1745 ? SB_INPUT_CLASS : SB_OUTPUT_CLASS;

	switch (dip->index) {
	case SB_MASTER_VOL:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = SB_OUTPUT_CLASS;
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmaster);
		dip->un.v.num_channels = chan;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;
	case SB_MIDI_VOL:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = class;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNfmsynth);
		dip->un.v.num_channels = chan;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;
	case SB_CD_VOL:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = class;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNcd);
		dip->un.v.num_channels = chan;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;
	case SB_VOICE_VOL:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = class;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNdac);
		dip->un.v.num_channels = chan;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;
	case SB_OUTPUT_CLASS:
		dip->type = AUDIO_MIXER_CLASS;
		dip->mixer_class = SB_OUTPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCOutputs);
		return 0;
	}

	if (sc->sc_mixer_model == SBM_CT1335)
		return ENXIO;

	switch (dip->index) {
	case SB_MIC_VOL:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = class;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNmicrophone);
		dip->un.v.num_channels = 1;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;

	case SB_LINE_IN_VOL:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = class;
		dip->prev = AUDIO_MIXER_LAST;
		dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNline);
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;

	case SB_RECORD_SOURCE:
		dip->mixer_class = SB_RECORD_CLASS;
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNsource);
		if (sc->sc_mixer_model == SBM_CT1745) {
			dip->type = AUDIO_MIXER_SET;
			dip->un.s.num_mem = 4;
			strcpy(dip->un.s.member[0].label.name, AudioNmicrophone);
			dip->un.s.member[0].mask = 1 << SB_MIC_VOL;
			strcpy(dip->un.s.member[1].label.name, AudioNcd);
			dip->un.s.member[1].mask = 1 << SB_CD_VOL;
			strcpy(dip->un.s.member[2].label.name, AudioNline);
			dip->un.s.member[2].mask = 1 << SB_LINE_IN_VOL;
			strcpy(dip->un.s.member[3].label.name, AudioNfmsynth);
			dip->un.s.member[3].mask = 1 << SB_MIDI_VOL;
		} else {
			dip->type = AUDIO_MIXER_ENUM;
			dip->un.e.num_mem = 3;
			strcpy(dip->un.e.member[0].label.name, AudioNmicrophone);
			dip->un.e.member[0].ord = SB_MIC_VOL;
			strcpy(dip->un.e.member[1].label.name, AudioNcd);
			dip->un.e.member[1].ord = SB_CD_VOL;
			strcpy(dip->un.e.member[2].label.name, AudioNline);
			dip->un.e.member[2].ord = SB_LINE_IN_VOL;
		}
		return 0;

	case SB_BASS:
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNbass);
		if (sc->sc_mixer_model == SBM_CT1745) {
			dip->type = AUDIO_MIXER_VALUE;
			dip->mixer_class = SB_EQUALIZATION_CLASS;
			dip->un.v.num_channels = 2;
			strcpy(dip->un.v.units.name, AudioNbass);
		} else {
			dip->type = AUDIO_MIXER_ENUM;
			dip->mixer_class = SB_INPUT_CLASS;
			dip->un.e.num_mem = 2;
			strcpy(dip->un.e.member[0].label.name, AudioNoff);
			dip->un.e.member[0].ord = 0;
			strcpy(dip->un.e.member[1].label.name, AudioNon);
			dip->un.e.member[1].ord = 1;
		}
		return 0;

	case SB_TREBLE:
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNtreble);
		if (sc->sc_mixer_model == SBM_CT1745) {
			dip->type = AUDIO_MIXER_VALUE;
			dip->mixer_class = SB_EQUALIZATION_CLASS;
			dip->un.v.num_channels = 2;
			strcpy(dip->un.v.units.name, AudioNtreble);
		} else {
			dip->type = AUDIO_MIXER_ENUM;
			dip->mixer_class = SB_INPUT_CLASS;
			dip->un.e.num_mem = 2;
			strcpy(dip->un.e.member[0].label.name, AudioNoff);
			dip->un.e.member[0].ord = 0;
			strcpy(dip->un.e.member[1].label.name, AudioNon);
			dip->un.e.member[1].ord = 1;
		}
		return 0;

	case SB_RECORD_CLASS:			/* record source class */
		dip->type = AUDIO_MIXER_CLASS;
		dip->mixer_class = SB_RECORD_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCRecord);
		return 0;

	}

	if (sc->sc_mixer_model == SBM_CT1345)
		return ENXIO;

	switch(dip->index) {
	case SB_PCSPEAKER:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = SB_INPUT_CLASS;
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "pc_speaker");
		dip->un.v.num_channels = 1;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;

	case SB_INPUT_GAIN:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = SB_INPUT_CLASS;
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNinput);
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;

	case SB_OUTPUT_GAIN:
		dip->type = AUDIO_MIXER_VALUE;
		dip->mixer_class = SB_OUTPUT_CLASS;
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioNoutput);
		dip->un.v.num_channels = 2;
		strcpy(dip->un.v.units.name, AudioNvolume);
		return 0;

	case SB_AGC:
		dip->type = AUDIO_MIXER_ENUM;
		dip->mixer_class = SB_INPUT_CLASS;
		dip->prev = dip->next = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, "AGC");
		dip->un.e.num_mem = 2;
		strcpy(dip->un.e.member[0].label.name, AudioNoff);
		dip->un.e.member[0].ord = 0;
		strcpy(dip->un.e.member[1].label.name, AudioNon);
		dip->un.e.member[1].ord = 1;
		return 0;

	case SB_INPUT_CLASS:
		dip->type = AUDIO_MIXER_CLASS;
		dip->mixer_class = SB_INPUT_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCInputs);
		return 0;

	case SB_EQUALIZATION_CLASS:
		dip->type = AUDIO_MIXER_CLASS;
		dip->mixer_class = SB_EQUALIZATION_CLASS;
		dip->next = dip->prev = AUDIO_MIXER_LAST;
		strcpy(dip->label.name, AudioCEqualization);
		return 0;
	}

	return ENXIO;
}