sys/dev/isa/sbdsp.c

root/sys/dev/isa/sbdsp.c
/*      $OpenBSD: sbdsp.c,v 1.44 2022/11/02 10:41:34 kn 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@vigra.com>'s
 * SBlast driver for 386BSD and DOS driver code from Daniel Sachs
 * <sachs@meibm15.cen.uiuc.edu>.
 * Lots of rewrites by Lennart Augustsson <augustss@cs.chalmers.se>
 * with information from SB "Hardware Programming Guide" and the
 * Linux drivers.
 */

#include "midi.h"

#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/buf.h>
#include <sys/fcntl.h>

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

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

#include <dev/isa/isavar.h>
#include <dev/isa/isadmavar.h>

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


#ifdef AUDIO_DEBUG
#define DPRINTF(x)      if (sbdspdebug) printf x
#define DPRINTFN(n,x)   if (sbdspdebug >= (n)) printf x
int     sbdspdebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

#ifndef SBDSP_NPOLL
#define SBDSP_NPOLL 3000
#endif

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

/*
 * 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
 */
/* XXX Should we round the tc?
#define SB_RATE_TO_TC(x) (((65536 - 256 * 1000000 / (x)) + 128) >> 8)
*/
#define SB_RATE_TO_TC(x) (256 - 1000000 / (x))
#define SB_TC_TO_RATE(tc) (1000000 / (256 - (tc)))

struct sbmode {
        short   model;
        u_char  channels;
        u_char  precision;
        u_short lowrate, highrate;
        u_char  cmd;
        u_char  cmdchan;
};
static struct sbmode sbpmodes[] = {
 { SB_1,    1,  8,  4000, 22727, SB_DSP_WDMA      },
 { SB_20,   1,  8,  4000, 22727, SB_DSP_WDMA_LOOP },
 { SB_2x,   1,  8,  4000, 22727, SB_DSP_WDMA_LOOP },
 { SB_2x,   1,  8, 22727, 45454, SB_DSP_HS_OUTPUT },
 { SB_PRO,  1,  8,  4000, 22727, SB_DSP_WDMA_LOOP },
 { SB_PRO,  1,  8, 22727, 45454, SB_DSP_HS_OUTPUT },
 { SB_PRO,  2,  8, 11025, 22727, SB_DSP_HS_OUTPUT },
 /* Yes, we write the record mode to set 16-bit playback mode. weird, huh? */
 { SB_JAZZ, 1,  8,  4000, 22727, SB_DSP_WDMA_LOOP, SB_DSP_RECORD_MONO },
 { SB_JAZZ, 1,  8, 22727, 45454, SB_DSP_HS_OUTPUT, SB_DSP_RECORD_MONO },
 { SB_JAZZ, 2,  8, 11025, 22727, SB_DSP_HS_OUTPUT, SB_DSP_RECORD_STEREO },
 { SB_JAZZ, 1, 16,  4000, 22727, SB_DSP_WDMA_LOOP, JAZZ16_RECORD_MONO },
 { SB_JAZZ, 1, 16, 22727, 45454, SB_DSP_HS_OUTPUT, JAZZ16_RECORD_MONO },
 { SB_JAZZ, 2, 16, 11025, 22727, SB_DSP_HS_OUTPUT, JAZZ16_RECORD_STEREO },
 { SB_16,   1,  8,  5000, 45000, SB_DSP16_WDMA_8  },
 { SB_16,   2,  8,  5000, 45000, SB_DSP16_WDMA_8  },
#define PLAY16 15 /* must be the index of the next entry in the table */
 { SB_16,   1, 16,  5000, 45000, SB_DSP16_WDMA_16 },
 { SB_16,   2, 16,  5000, 45000, SB_DSP16_WDMA_16 },
 { -1 }
};
static struct sbmode sbrmodes[] = {
 { SB_1,    1,  8,  4000, 12987, SB_DSP_RDMA      },
 { SB_20,   1,  8,  4000, 12987, SB_DSP_RDMA_LOOP },
 { SB_2x,   1,  8,  4000, 12987, SB_DSP_RDMA_LOOP },
 { SB_2x,   1,  8, 12987, 14925, SB_DSP_HS_INPUT  },
 { SB_PRO,  1,  8,  4000, 22727, SB_DSP_RDMA_LOOP, SB_DSP_RECORD_MONO },
 { SB_PRO,  1,  8, 22727, 45454, SB_DSP_HS_INPUT,  SB_DSP_RECORD_MONO },
 { SB_PRO,  2,  8, 11025, 22727, SB_DSP_HS_INPUT,  SB_DSP_RECORD_STEREO },
 { SB_JAZZ, 1,  8,  4000, 22727, SB_DSP_RDMA_LOOP, SB_DSP_RECORD_MONO },
 { SB_JAZZ, 1,  8, 22727, 45454, SB_DSP_HS_INPUT,  SB_DSP_RECORD_MONO },
 { SB_JAZZ, 2,  8, 11025, 22727, SB_DSP_HS_INPUT,  SB_DSP_RECORD_STEREO },
 { SB_JAZZ, 1, 16,  4000, 22727, SB_DSP_RDMA_LOOP, JAZZ16_RECORD_MONO },
 { SB_JAZZ, 1, 16, 22727, 45454, SB_DSP_HS_INPUT,  JAZZ16_RECORD_MONO },
 { SB_JAZZ, 2, 16, 11025, 22727, SB_DSP_HS_INPUT,  JAZZ16_RECORD_STEREO },
 { SB_16,   1,  8,  5000, 45000, SB_DSP16_RDMA_8  },
 { SB_16,   2,  8,  5000, 45000, SB_DSP16_RDMA_8  },
 { SB_16,   1, 16,  5000, 45000, SB_DSP16_RDMA_16 },
 { SB_16,   2, 16,  5000, 45000, SB_DSP16_RDMA_16 },
 { -1 }
};

static struct audio_params sbdsp_audio_default =
        {44100, AUDIO_ENCODING_SLINEAR_LE, 16, 2, 1, 2};

void    sbversion(struct sbdsp_softc *);
void    sbdsp_jazz16_probe(struct sbdsp_softc *);
void    sbdsp_set_mixer_gain(struct sbdsp_softc *sc, int port);
void    sbdsp_to(void *);
void    sbdsp_pause(struct sbdsp_softc *);
int     sbdsp_set_timeconst(struct sbdsp_softc *, int);
int     sbdsp16_set_rate(struct sbdsp_softc *, int, int);
int     sbdsp_set_in_ports(struct sbdsp_softc *, int);
void    sbdsp_set_ifilter(void *, int);
int     sbdsp_get_ifilter(void *);

int     sbdsp_block_output(void *);
int     sbdsp_block_input(void *);
static  int sbdsp_adjust(int, int);

int     sbdsp_midi_intr(void *);

#ifdef AUDIO_DEBUG
void    sb_printsc(struct sbdsp_softc *);

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

        printf("open %d dmachan %d/%d %d/%d iobase 0x%x irq %d\n",
            (int)sc->sc_open, sc->sc_i.run, sc->sc_o.run,
            sc->sc_drq8, sc->sc_drq16,
            sc->sc_iobase, sc->sc_irq);
        printf("irate %d itc %x orate %d otc %x\n",
            sc->sc_i.rate, sc->sc_i.tc,
            sc->sc_o.rate, sc->sc_o.tc);
        printf("spkron %u nintr %lu\n",
            sc->spkr_state, sc->sc_interrupts);
        printf("intr8 %p arg8 %p\n",
            sc->sc_intr8, sc->sc_arg16);
        printf("intr16 %p arg16 %p\n",
            sc->sc_intr8, sc->sc_arg16);
        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(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 & 1)
                sbdsp_jazz16_probe(sc);
        else
                sbversion(sc);
        if (sc->sc_model == SB_UNK) {
                /* Unknown SB model found. */
                DPRINTF(("sbdsp: unknown SB model found\n"));
                return 0;
        }
        return 1;
}

/*
 * Try add-on stuff for Jazz16.
 */
void
sbdsp_jazz16_probe(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};

        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh;

        sbversion(sc);

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

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

        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"));
                sc->sc_model = SB_JAZZ;
                sc->sc_mixer_model = SBM_CT1345; /* XXX really? */
        }

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

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

        /*
         * Create our DMA maps.
         */
        if (sc->sc_drq8 != -1) {
                if (isa_dmamap_create(sc->sc_isa, sc->sc_drq8,
                    MAX_ISADMA, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW)) {
                        printf("%s: can't create map for drq %d\n",
                            sc->sc_dev.dv_xname, sc->sc_drq8);
                        return;
                }
        }
        if (sc->sc_drq16 != -1 && sc->sc_drq16 != sc->sc_drq8) {
                if (isa_dmamap_create(sc->sc_isa, sc->sc_drq16,
                    MAX_ISADMA, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW)) {
                        printf("%s: can't create map for drq %d\n",
                            sc->sc_dev.dv_xname, sc->sc_drq16);
                        return;
                }
        }

        pparams = sbdsp_audio_default;
        rparams = sbdsp_audio_default;
        sbdsp_set_params(sc, AUMODE_RECORD|AUMODE_PLAY, 0, &pparams, &rparams);

        sbdsp_set_in_ports(sc, 1 << SB_MIC_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;
                        case SB_CD_IN_MUTE:
                        case SB_MIC_IN_MUTE:
                        case SB_LINE_IN_MUTE:
                        case SB_MIDI_IN_MUTE:
                        case SB_CD_SWAP:
                        case SB_MIC_SWAP:
                        case SB_LINE_SWAP:
                        case SB_MIDI_SWAP:
                        case SB_CD_OUT_MUTE:
                        case SB_MIC_OUT_MUTE:
                        case SB_LINE_OUT_MUTE:
                                v = 0;
                                break;
                        default:
                                v = SB_ADJUST_GAIN(sc, AUDIO_MAX_GAIN / 2);
                                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_version), SBVER_MINOR(sc->sc_version),
               sc->sc_model == SB_JAZZ ? ": <Jazz16>" : "");

        timeout_set(&sc->sc_tmo, sbdsp_to, sbdsp_to);
        sc->sc_fullduplex = ISSB16CLASS(sc) &&
                sc->sc_drq8 != -1 && sc->sc_drq16 != -1 &&
                sc->sc_drq8 != sc->sc_drq16;
}

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

        mtx_enter(&audio_lock);
        bus_space_write_1(iot, ioh, SBP_MIXER_ADDR, mixerport);
        delay(20);
        bus_space_write_1(iot, ioh, SBP_MIXER_DATA, val);
        delay(30);
        mtx_leave(&audio_lock);
}

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

        mtx_enter(&audio_lock);
        bus_space_write_1(iot, ioh, SBP_MIXER_ADDR, mixerport);
        delay(20);
        val = bus_space_read_1(iot, ioh, SBP_MIXER_DATA);
        delay(30);
        mtx_leave(&audio_lock);
        return val;
}

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

int
sbdsp_set_params(void *addr, int setmode, int usemode,
    struct audio_params *play, struct audio_params *rec)
{
        struct sbdsp_softc *sc = addr;
        struct sbmode *m;
        u_int rate, tc, bmode;
        int model;
        int chan;
        struct audio_params *p;
        int mode;

        if (sc->sc_open == SB_OPEN_MIDI)
                return EBUSY;

        model = sc->sc_model;
        if (model > SB_16)
                model = SB_16;  /* later models work like SB16 */

        /*
         * Prior to the SB16, we have only one clock, so make the sample
         * rates match.
         */
        if (!ISSB16CLASS(sc) &&
            play->sample_rate != rec->sample_rate &&
            usemode == (AUMODE_PLAY | AUMODE_RECORD)) {
                if (setmode == AUMODE_PLAY) {
                        rec->sample_rate = play->sample_rate;
                        setmode |= AUMODE_RECORD;
                } else if (setmode == AUMODE_RECORD) {
                        play->sample_rate = rec->sample_rate;
                        setmode |= AUMODE_PLAY;
                } else
                        return (EINVAL);
        }

        /* Set first record info, then play info */
        for (mode = AUMODE_RECORD; mode != -1;
             mode = mode == AUMODE_RECORD ? AUMODE_PLAY : -1) {
                if ((setmode & mode) == 0)
                        continue;

                p = mode == AUMODE_PLAY ? play : rec;

                switch (model) {
                case SB_1:
                case SB_20:
                        if (mode == AUMODE_PLAY) {
                                if (p->sample_rate < 4000)
                                        p->sample_rate = 4000;
                                else if (p->sample_rate > 22727)
                                        p->sample_rate = 22727; /* 22050 ? */
                        } else {
                                if (p->sample_rate < 4000)
                                        p->sample_rate = 4000;
                                else if (p->sample_rate > 12987)
                                        p->sample_rate = 12987;
                        }
                        break;
                case SB_2x:
                        if (mode == AUMODE_PLAY) {
                                if (p->sample_rate < 4000)
                                        p->sample_rate = 4000;
                                else if (p->sample_rate > 45454)
                                        p->sample_rate = 45454; /* 44100 ? */
                        } else {
                                if (p->sample_rate < 4000)
                                        p->sample_rate = 4000;
                                else if (p->sample_rate > 14925)
                                        p->sample_rate = 14925; /* ??? */
                        }
                        break;
                case SB_PRO:
                case SB_JAZZ:
                        if (p->channels == 2) {
                                if (p->sample_rate < 11025)
                                        p->sample_rate = 11025;
                                else if (p->sample_rate > 22727)
                                        p->sample_rate = 22727; /* 22050 ? */
                        } else {
                                if (p->sample_rate < 4000)
                                        p->sample_rate = 4000;
                                else if (p->sample_rate > 45454)
                                        p->sample_rate = 45454; /* 44100 ? */
                        }
                        break;
                case SB_16:
                        if (p->sample_rate < 5000)
                                p->sample_rate = 5000;
                        else if (p->sample_rate > 45000)
                                p->sample_rate = 45000; /* 44100 ? */
                        break;
                }

                /* Locate proper commands */
                for(m = mode == AUMODE_PLAY ? sbpmodes : sbrmodes;
                    m->model != -1; m++) {
                        if (model == m->model &&
                            p->channels == m->channels &&
                            p->precision == m->precision &&
                            p->sample_rate >= m->lowrate &&
                            p->sample_rate <= m->highrate)
                                break;
                }
                if (m->model == -1)
                        return EINVAL;
                rate = p->sample_rate;
                tc = 1;
                bmode = -1;
                if (model == SB_16) {
                        switch (p->encoding) {
                        case AUDIO_ENCODING_SLINEAR_BE:
                                if (p->precision == 16)
                                        return EINVAL;
                                /* fall into */
                        case AUDIO_ENCODING_SLINEAR_LE:
                                bmode = SB_BMODE_SIGNED;
                                break;
                        case AUDIO_ENCODING_ULINEAR_BE:
                                if (p->precision == 16)
                                        return EINVAL;
                                /* fall into */
                        case AUDIO_ENCODING_ULINEAR_LE:
                                bmode = SB_BMODE_UNSIGNED;
                                break;
                        default:
                                return EINVAL;
                        }
                        if (p->channels == 2)
                                bmode |= SB_BMODE_STEREO;
                } else if (m->model == SB_JAZZ && m->precision == 16) {
                        switch (p->encoding) {
                        case AUDIO_ENCODING_SLINEAR_LE:
                                break;
                        default:
                                return EINVAL;
                        }
                        tc = SB_RATE_TO_TC(p->sample_rate * p->channels);
                        p->sample_rate = SB_TC_TO_RATE(tc) / p->channels;
                } else {
                        switch (p->encoding) {
                        case AUDIO_ENCODING_ULINEAR_BE:
                        case AUDIO_ENCODING_ULINEAR_LE:
                                break;
                        default:
                                return EINVAL;
                        }
                        tc = SB_RATE_TO_TC(p->sample_rate * p->channels);
                        p->sample_rate = SB_TC_TO_RATE(tc) / p->channels;
                }

                chan = m->precision == 16 ? sc->sc_drq16 : sc->sc_drq8;
                if (mode == AUMODE_PLAY) {
                        sc->sc_o.rate = rate;
                        sc->sc_o.tc = tc;
                        sc->sc_o.modep = m;
                        sc->sc_o.bmode = bmode;
                        sc->sc_o.dmachan = chan;
                } else {
                        sc->sc_i.rate = rate;
                        sc->sc_i.tc = tc;
                        sc->sc_i.modep = m;
                        sc->sc_i.bmode = bmode;
                        sc->sc_i.dmachan = chan;
                }

                p->bps = AUDIO_BPS(p->precision);
                p->msb = 1;
                DPRINTF(("sbdsp_set_params: model=%d, mode=%d, rate=%ld, prec=%d, chan=%d, enc=%d -> tc=%02x, cmd=%02x, bmode=%02x, cmdchan=%02x\n",
                         sc->sc_model, mode, p->sample_rate, p->precision, p->channels,
                         p->encoding, tc, m->cmd, bmode, m->cmdchan));

        }

        /*
         * XXX
         * Should wait for chip to be idle.
         */
        sc->sc_i.run = SB_NOTRUNNING;
        sc->sc_o.run = SB_NOTRUNNING;

        if (sc->sc_fullduplex &&
            usemode == (AUMODE_PLAY | AUMODE_RECORD) &&
            sc->sc_i.dmachan == sc->sc_o.dmachan) {
                DPRINTF(("sbdsp_set_params: fd=%d, usemode=%d, idma=%d, odma=%d\n", sc->sc_fullduplex, usemode, sc->sc_i.dmachan, sc->sc_o.dmachan));
                return EINVAL;
        }
        DPRINTF(("sbdsp_set_params ichan=%d, ochan=%d\n",
                 sc->sc_i.dmachan, sc->sc_o.dmachan));

        return 0;
}

void
sbdsp_set_ifilter(void *addr, int which)
{
        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(void *addr)
{
        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_in_ports(struct sbdsp_softc *sc, int mask)
{
        int bitsl, bitsr;
        int sbport;

        if (sc->sc_open == SB_OPEN_MIDI)
                return EBUSY;

        DPRINTF(("sbdsp_set_in_ports: model=%d, mask=%x\n",
                 sc->sc_mixer_model, mask));

        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, sbport | sc->in_filter);
                break;
        case SBM_CT1XX5:
        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 & (1<<SB_MIDI_VOL))    bitsr |= SBP_MIDI_SRC_R;
                if (mask & (1<<SB_LINE_IN_VOL)) bitsr |= SBP_LINE_SRC_R;
                if (mask & (1<<SB_CD_VOL))      bitsr |= SBP_CD_SRC_R;
                bitsl = SB_SRC_R_TO_L(bitsr);
                if (mask & (1<<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;

        return 0;
}

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

        if (sc->sc_open == SB_OPEN_MIDI)
                return EBUSY;

        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(void *addr, int blk)
{
        return (blk + 3) & -4;  /* round to biggest sample size */
}

int
sbdsp_open(void *addr, int flags)
{
        struct sbdsp_softc *sc = addr;

        DPRINTF(("sbdsp_open: sc=%p\n", sc));

        if ((flags & (FWRITE | FREAD)) == (FWRITE | FREAD) &&
            !sc->sc_fullduplex)
                return ENXIO;
        if (sc->sc_open != SB_CLOSED)
                return EBUSY;
        if (sbdsp_reset(sc) != 0)
                return EIO;

        sbdsp_speaker_ctl(sc, (flags & FWRITE) ? SPKR_ON : SPKR_OFF);

        sc->sc_open = SB_OPEN_AUDIO;
        sc->sc_openflags = flags;
        sc->sc_intrm = 0;
        if (ISSBPRO(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(void *addr)
{
        struct sbdsp_softc *sc = addr;

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

        sc->sc_open = SB_CLOSED;
        sbdsp_spkroff(sc);
        sc->spkr_state = SPKR_OFF;
        sc->sc_intr8 = 0;
        sc->sc_intr16 = 0;
        sc->sc_intrm = 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(struct sbdsp_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;

        sc->sc_intr8 = 0;
        sc->sc_intr16 = 0;
        if (sc->sc_i.run != SB_NOTRUNNING) {
                isa_dmaabort(sc->sc_isa, sc->sc_i.dmachan);
                sc->sc_i.run = SB_NOTRUNNING;
        }
        if (sc->sc_o.run != SB_NOTRUNNING) {
                isa_dmaabort(sc->sc_isa, sc->sc_o.dmachan);
                sc->sc_o.run = SB_NOTRUNNING;
        }

        /*
         * 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;
}

/*
 * Write a byte to the dsp.
 * 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(struct sbdsp_softc *sc, int v)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;
        int i;
        u_char x;

        for (i = SBDSP_NPOLL; --i >= 0; ) {
                x = bus_space_read_1(iot, ioh, SBP_DSP_WSTAT);
                delay(10);
                if ((x & SB_DSP_BUSY) == 0) {
                        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(struct sbdsp_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh = sc->sc_ioh;
        int i;
        u_char x;

        for (i = SBDSP_NPOLL; --i >= 0; ) {
                x = bus_space_read_1(iot, ioh, SBP_DSP_RSTAT);
                delay(10);
                if (x & SB_DSP_READY) {
                        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(void *arg)
{
        wakeup(arg);
}

void
sbdsp_pause(struct sbdsp_softc *sc)
{
        timeout_add_msec(&sc->sc_tmo, 125);     /* 8x per second */
        tsleep_nsec(sbdsp_to, PWAIT, "sbpause", INFSLP);
}

/*
 * Turn on the speaker.  The SBK documentation 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(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(struct sbdsp_softc *sc)
{
        (void)sbdsp_wdsp(sc, SB_DSP_SPKR_OFF);
        sbdsp_pause(sc);
}

/*
 * Read the version number out of the card.
 * Store version information in the softc.
 */
void
sbversion(struct sbdsp_softc *sc)
{
        int v;

        sc->sc_model = SB_UNK;
        sc->sc_version = 0;
        if (sbdsp_wdsp(sc, SB_DSP_VERSION) < 0)
                return;
        v = sbdsp_rdsp(sc) << 8;
        v |= sbdsp_rdsp(sc);
        if (v < 0)
                return;
        sc->sc_version = v;
        switch(SBVER_MAJOR(v)) {
        case 1:
                sc->sc_mixer_model = SBM_NONE;
                sc->sc_model = SB_1;
                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) & 0x0e) == 0x04 &&
                    (sbdsp_mix_read(sc, SBP_1335_MIDI_VOL)   & 0x0e) == 0x06)
                        sc->sc_mixer_model = SBM_CT1335;
                else
                        sc->sc_mixer_model = SBM_NONE;
                if (SBVER_MINOR(v) == 0)
                        sc->sc_model = SB_20;
                else
                        sc->sc_model = SB_2x;
                break;
        case 3:
                sc->sc_mixer_model = SBM_CT1345;
                sc->sc_model = SB_PRO;
                break;
        case 4:
#if 0
/* XXX This does not work */
                /* Most SB16 have a tone controls, but some don't. */
                sbdsp_mix_write(sc, SB16P_TREBLE_L, 0x80);
                /* Check if we can read back the mixer value. */
                if ((sbdsp_mix_read(sc, SB16P_TREBLE_L) & 0xf0) == 0x80)
                        sc->sc_mixer_model = SBM_CT1745;
                else
                        sc->sc_mixer_model = SBM_CT1XX5;
#else
                sc->sc_mixer_model = SBM_CT1745;
#endif
#if 0
/* XXX figure out a good way of determining the model */
                /* XXX what about SB_32 */
                if (SBVER_MINOR(v) == 16)
                        sc->sc_model = SB_64;
                else
#endif
                        sc->sc_model = SB_16;
                break;
        }
}

/*
 * Halt a DMA in progress.
 */
int
sbdsp_haltdma(void *addr)
{
        struct sbdsp_softc *sc = addr;

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

        mtx_enter(&audio_lock);
        sbdsp_reset(sc);
        mtx_leave(&audio_lock);
        return 0;
}

int
sbdsp_set_timeconst(struct sbdsp_softc *sc, int tc)
{
        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
sbdsp16_set_rate(struct sbdsp_softc *sc, int cmd, int rate)
{
        DPRINTF(("sbdsp16_set_rate: sc=%p cmd=0x%02x rate=%d\n", sc, cmd, rate));

        if (sbdsp_wdsp(sc, cmd) < 0 ||
            sbdsp_wdsp(sc, rate >> 8) < 0 ||
            sbdsp_wdsp(sc, rate) < 0)
                return EIO;
        return 0;
}

int
sbdsp_trigger_input(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, struct audio_params *param)
{
        struct sbdsp_softc *sc = addr;
        int stereo = param->channels == 2;
        int width = param->precision;
        int filter;
        int rc;

#ifdef DIAGNOSTIC
        if (stereo && (blksize & 1)) {
                DPRINTF(("stereo record odd bytes (%d)\n", blksize));
                return (EIO);
        }
#endif

        sc->sc_intrr = intr;
        sc->sc_argr = arg;

        if (width == 8) {
#ifdef DIAGNOSTIC
                if (sc->sc_i.dmachan != sc->sc_drq8) {
                        printf("sbdsp_trigger_input: width=%d bad chan %d\n",
                            width, sc->sc_i.dmachan);                   
                        return (EIO);
                }
#endif
                sc->sc_intr8 = sbdsp_block_input;
                sc->sc_arg8 = addr;
        } else {
#ifdef DIAGNOSTIC
                if (sc->sc_i.dmachan != sc->sc_drq16) {
                        printf("sbdsp_trigger_input: width=%d bad chan %d\n",
                            width, sc->sc_i.dmachan);
                        return (EIO);
                }
#endif
                sc->sc_intr16 = sbdsp_block_input;
                sc->sc_arg16 = addr;
        }

        if ((sc->sc_model == SB_JAZZ) ? (sc->sc_i.dmachan > 3) : (width == 16))
                blksize >>= 1;
        --blksize;
        sc->sc_i.blksize = blksize;

        if (ISSBPRO(sc)) {
                if (sbdsp_wdsp(sc, sc->sc_i.modep->cmdchan) < 0)
                        return (EIO);
                filter = stereo ? SBP_FILTER_OFF : sc->in_filter;
                sbdsp_mix_write(sc, SBP_INFILTER,
                    (sbdsp_mix_read(sc, SBP_INFILTER) & ~SBP_IFILTER_MASK) |
                    filter);
        }

        if (ISSB16CLASS(sc)) {
                if (sbdsp16_set_rate(sc, SB_DSP16_INPUTRATE, sc->sc_i.rate)) {
                        DPRINTF(("sbdsp_trigger_input: rate=%d set failed\n",
                                 sc->sc_i.rate));
                        return (EIO);
                }
        } else {
                if (sbdsp_set_timeconst(sc, sc->sc_i.tc)) {
                        DPRINTF(("sbdsp_trigger_input: tc=%d set failed\n",
                                 sc->sc_i.rate));
                        return (EIO);
                }
        }

        DPRINTF(("sbdsp: dma start loop input start=%p end=%p chan=%d\n",
            start, end, sc->sc_i.dmachan));
        mtx_enter(&audio_lock);
        isa_dmastart(sc->sc_isa, sc->sc_i.dmachan, start, (char *)end -
            (char *)start, NULL, DMAMODE_READ | DMAMODE_LOOP, BUS_DMA_NOWAIT);
        rc = sbdsp_block_input(addr);
        mtx_leave(&audio_lock);
        return rc;
}

int
sbdsp_block_input(void *addr)
{
        struct sbdsp_softc *sc = addr;
        int cc = sc->sc_i.blksize;

        DPRINTFN(2, ("sbdsp_block_input: sc=%p cc=%d\n", addr, cc));

        if (sc->sc_i.run != SB_NOTRUNNING)
                sc->sc_intrr(sc->sc_argr);

        if (sc->sc_model == SB_1) {
                /* Non-looping mode, start DMA */
                if (sbdsp_wdsp(sc, sc->sc_i.modep->cmd) < 0 ||
                    sbdsp_wdsp(sc, cc) < 0 ||
                    sbdsp_wdsp(sc, cc >> 8) < 0) {
                        DPRINTF(("sbdsp_block_input: SB1 DMA start failed\n"));
                        return (EIO);
                }
                sc->sc_i.run = SB_RUNNING;
        } else if (sc->sc_i.run == SB_NOTRUNNING) {
                /* Initialize looping PCM */
                if (ISSB16CLASS(sc)) {
                        DPRINTFN(3, ("sbdsp16 input command cmd=0x%02x bmode=0x%02x cc=%d\n",
                            sc->sc_i.modep->cmd, sc->sc_i.bmode, cc));
                        if (sbdsp_wdsp(sc, sc->sc_i.modep->cmd) < 0 ||
                            sbdsp_wdsp(sc, sc->sc_i.bmode) < 0 ||
                            sbdsp_wdsp(sc, cc) < 0 ||
                            sbdsp_wdsp(sc, cc >> 8) < 0) {
                                DPRINTF(("sbdsp_block_input: SB16 DMA start failed\n"));
                                return (EIO);
                        }
                } else {
                        DPRINTF(("sbdsp_block_input: set blocksize=%d\n", cc));
                        if (sbdsp_wdsp(sc, SB_DSP_BLOCKSIZE) < 0 ||
                            sbdsp_wdsp(sc, cc) < 0 ||
                            sbdsp_wdsp(sc, cc >> 8) < 0) {
                                DPRINTF(("sbdsp_block_input: SB2 DMA blocksize failed\n"));
                                return (EIO);
                        }
                        if (sbdsp_wdsp(sc, sc->sc_i.modep->cmd) < 0) {
                                DPRINTF(("sbdsp_block_input: SB2 DMA start failed\n"));
                                return (EIO);
                        }
                }
                sc->sc_i.run = SB_LOOPING;
        }

        return (0);
}

int
sbdsp_trigger_output(void *addr, void *start, void *end, int blksize,
    void (*intr)(void *), void *arg, struct audio_params *param)
{
        struct sbdsp_softc *sc = addr;
        int stereo = param->channels == 2;
        int width = param->precision;
        int cmd;
        int rc;

#ifdef DIAGNOSTIC
        if (stereo && (blksize & 1)) {
                DPRINTF(("stereo playback odd bytes (%d)\n", blksize));
                return (EIO);
        }
#endif

        sc->sc_intrp = intr;
        sc->sc_argp = arg;

        if (width == 8) {
#ifdef DIAGNOSTIC
                if (sc->sc_o.dmachan != sc->sc_drq8) {
                        printf("sbdsp_trigger_output: width=%d bad chan %d\n",
                            width, sc->sc_o.dmachan);
                        return (EIO);
                }
#endif
                sc->sc_intr8 = sbdsp_block_output;
                sc->sc_arg8 = addr;
        } else {
#ifdef DIAGNOSTIC
                if (sc->sc_o.dmachan != sc->sc_drq16) {
                        printf("sbdsp_trigger_output: width=%d bad chan %d\n",
                            width, sc->sc_o.dmachan);
                        return (EIO);
                }
#endif
                sc->sc_intr16 = sbdsp_block_output;
                sc->sc_arg16 = addr;
        }

        if ((sc->sc_model == SB_JAZZ) ? (sc->sc_o.dmachan > 3) : (width == 16))
                blksize >>= 1;
        --blksize;
        sc->sc_o.blksize = blksize;

        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) |
                    (stereo ?  SBP_PLAYMODE_STEREO : SBP_PLAYMODE_MONO));
                cmd = sc->sc_o.modep->cmdchan;
                if (cmd && sbdsp_wdsp(sc, cmd) < 0)
                        return (EIO);
        }

        if (ISSB16CLASS(sc)) {
                if (sbdsp16_set_rate(sc, SB_DSP16_OUTPUTRATE, sc->sc_o.rate)) {
                        DPRINTF(("sbdsp_trigger_output: rate=%d set failed\n",
                                 sc->sc_o.rate));
                        return (EIO);
                }
        } else {
                if (sbdsp_set_timeconst(sc, sc->sc_o.tc)) {
                        DPRINTF(("sbdsp_trigger_output: tc=%d set failed\n",
                                 sc->sc_o.rate));
                        return (EIO);
                }
        }

        DPRINTF(("sbdsp: dma start loop output start=%p end=%p chan=%d\n",
            start, end, sc->sc_o.dmachan));
        mtx_enter(&audio_lock);
        isa_dmastart(sc->sc_isa, sc->sc_o.dmachan, start, (char *)end -
            (char *)start, NULL, DMAMODE_WRITE | DMAMODE_LOOP, BUS_DMA_NOWAIT);
        rc = sbdsp_block_output(addr);
        mtx_leave(&audio_lock);
        return rc;
}

int
sbdsp_block_output(void *addr)
{
        struct sbdsp_softc *sc = addr;
        int cc = sc->sc_o.blksize;

        DPRINTFN(2, ("sbdsp_block_output: sc=%p cc=%d\n", addr, cc));

        if (sc->sc_o.run != SB_NOTRUNNING)
                sc->sc_intrp(sc->sc_argp);

        if (sc->sc_model == SB_1) {
                /* Non-looping mode, initialized. Start DMA and PCM */
                if (sbdsp_wdsp(sc, sc->sc_o.modep->cmd) < 0 ||
                    sbdsp_wdsp(sc, cc) < 0 ||
                    sbdsp_wdsp(sc, cc >> 8) < 0) {
                        DPRINTF(("sbdsp_block_output: SB1 DMA start failed\n"));
                        return (EIO);
                }
                sc->sc_o.run = SB_RUNNING;
        } else if (sc->sc_o.run == SB_NOTRUNNING) {
                /* Initialize looping PCM */
                if (ISSB16CLASS(sc)) {
                        DPRINTF(("sbdsp_block_output: SB16 cmd=0x%02x bmode=0x%02x cc=%d\n",
                            sc->sc_o.modep->cmd,sc->sc_o.bmode, cc));
                        if (sbdsp_wdsp(sc, sc->sc_o.modep->cmd) < 0 ||
                            sbdsp_wdsp(sc, sc->sc_o.bmode) < 0 ||
                            sbdsp_wdsp(sc, cc) < 0 ||
                            sbdsp_wdsp(sc, cc >> 8) < 0) {
                                DPRINTF(("sbdsp_block_output: SB16 DMA start failed\n"));
                                return (EIO);
                        }
                } else {
                        DPRINTF(("sbdsp_block_output: set blocksize=%d\n", cc));
                        if (sbdsp_wdsp(sc, SB_DSP_BLOCKSIZE) < 0 ||
                            sbdsp_wdsp(sc, cc) < 0 ||
                            sbdsp_wdsp(sc, cc >> 8) < 0) {
                                DPRINTF(("sbdsp_block_output: SB2 DMA blocksize failed\n"));
                                return (EIO);
                        }
                        if (sbdsp_wdsp(sc, sc->sc_o.modep->cmd) < 0) {
                                DPRINTF(("sbdsp_block_output: SB2 DMA start failed\n"));
                                return (EIO);
                        }
                }
                sc->sc_o.run = SB_LOOPING;
        }

        return (0);
}

/*
 * 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.
 *
 * If there is interrupt sharing or a spurious interrupt occurs
 * there is no way to distinguish this on an SB2.  So if you have
 * an SB2 and experience problems, buy an SB16 (it's only $40).
 */
int
sbdsp_intr(void *arg)
{
        struct sbdsp_softc *sc = arg;
        u_char irq;

        mtx_enter(&audio_lock);
        DPRINTFN(2, ("sbdsp_intr: intr8=%p, intr16=%p\n",
                   sc->sc_intr8, sc->sc_intr16));
        if (ISSB16CLASS(sc)) {          
                bus_space_write_1(sc->sc_iot, sc->sc_ioh,
                    SBP_MIXER_ADDR, SBP_IRQ_STATUS);
                delay(20);
                irq = bus_space_read_1(sc->sc_iot, sc->sc_ioh,
                    SBP_MIXER_DATA);
                delay(30);
                if ((irq & (SBP_IRQ_DMA8 | SBP_IRQ_DMA16 | SBP_IRQ_MPU401)) == 0) {
                        DPRINTF(("sbdsp_intr: Spurious interrupt 0x%x\n", irq));
                        mtx_leave(&audio_lock);
                        return 0;
                }
        } else {
                /* XXXX CHECK FOR INTERRUPT */
                irq = SBP_IRQ_DMA8;
        }

        sc->sc_interrupts++;
        delay(10);              /* XXX why? */

        /* clear interrupt */
        if (irq & SBP_IRQ_DMA8) {
                bus_space_read_1(sc->sc_iot, sc->sc_ioh, SBP_DSP_IRQACK8);
                if (sc->sc_intr8)
                        sc->sc_intr8(sc->sc_arg8);
        }
        if (irq & SBP_IRQ_DMA16) {
                bus_space_read_1(sc->sc_iot, sc->sc_ioh, SBP_DSP_IRQACK16);
                if (sc->sc_intr16)
                        sc->sc_intr16(sc->sc_arg16);
        }
#if NMIDI > 0
        if ((irq & SBP_IRQ_MPU401) && sc->sc_hasmpu) {
                mpu_intr(&sc->sc_mpu_sc);
        }
#endif
        mtx_leave(&audio_lock);
        return 1;
}

/* Like val & mask, but make sure the result is correctly rounded. */
#define MAXVAL 256
static int
sbdsp_adjust(int val, int mask)
{
        val += (MAXVAL - mask) >> 1;
        if (val >= MAXVAL)
                val = MAXVAL-1;
        return val & mask;
}

void
sbdsp_set_mixer_gain(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_CT1XX5:
        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(void *addr, mixer_ctrl_t *cp)
{
        struct sbdsp_softc *sc = addr;
        int lgain, rgain;
        int mask, bits;
        int lmask, rmask, lbits, rbits;
        int mute, swap;

        if (sc->sc_open == SB_OPEN_MIDI)
                return EBUSY;

        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 ||
                    sc->sc_mixer_model == SBM_CT1XX5) {
                        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 (!ISSBM1745(sc))
                        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 (ISSBM1745(sc)) {
                        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;
                        sc->in_port = cp->un.ord;
                        return sbdsp_set_in_ports(sc, 1 << cp->un.ord);
                }
                break;

        case SB_AGC:
                if (!ISSBM1745(sc) || cp->type != AUDIO_MIXER_ENUM)
                        return EINVAL;
                sbdsp_mix_write(sc, SB16P_AGC, cp->un.ord & 1);
                break;

        case SB_CD_OUT_MUTE:
                mask = SB16P_SW_CD;
                goto omute;
        case SB_MIC_OUT_MUTE:
                mask = SB16P_SW_MIC;
                goto omute;
        case SB_LINE_OUT_MUTE:
                mask = SB16P_SW_LINE;
        omute:
                if (cp->type != AUDIO_MIXER_ENUM)
                        return EINVAL;
                bits = sbdsp_mix_read(sc, SB16P_OSWITCH);
                sc->gain[cp->dev][SB_LR] = cp->un.ord != 0;
                if (cp->un.ord)
                        bits = bits & ~mask;
                else
                        bits = bits | mask;
                sbdsp_mix_write(sc, SB16P_OSWITCH, bits);
                break;

        case SB_MIC_IN_MUTE:
        case SB_MIC_SWAP:
                lmask = rmask = SB16P_SW_MIC;
                goto imute;
        case SB_CD_IN_MUTE:
        case SB_CD_SWAP:
                lmask = SB16P_SW_CD_L;
                rmask = SB16P_SW_CD_R;
                goto imute;
        case SB_LINE_IN_MUTE:
        case SB_LINE_SWAP:
                lmask = SB16P_SW_LINE_L;
                rmask = SB16P_SW_LINE_R;
                goto imute;
        case SB_MIDI_IN_MUTE:
        case SB_MIDI_SWAP:
                lmask = SB16P_SW_MIDI_L;
                rmask = SB16P_SW_MIDI_R;
        imute:
                if (cp->type != AUDIO_MIXER_ENUM)
                        return EINVAL;
                mask = lmask | rmask;
                lbits = sbdsp_mix_read(sc, SB16P_ISWITCH_L) & ~mask;
                rbits = sbdsp_mix_read(sc, SB16P_ISWITCH_R) & ~mask;
                sc->gain[cp->dev][SB_LR] = cp->un.ord != 0;
                if (SB_IS_IN_MUTE(cp->dev)) {
                        mute = cp->dev;
                        swap = mute - SB_CD_IN_MUTE + SB_CD_SWAP;
                } else {
                        swap = cp->dev;
                        mute = swap + SB_CD_IN_MUTE - SB_CD_SWAP;
                }
                if (sc->gain[swap][SB_LR]) {
                        mask = lmask;
                        lmask = rmask;
                        rmask = mask;
                }
                if (!sc->gain[mute][SB_LR]) {
                        lbits = lbits | lmask;
                        rbits = rbits | rmask;
                }
                sbdsp_mix_write(sc, SB16P_ISWITCH_L, lbits);
                sbdsp_mix_write(sc, SB16P_ISWITCH_L, rbits);
                break;

        default:
                return EINVAL;
        }

        return 0;
}

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

        if (sc->sc_open == SB_OPEN_MIDI)
                return EBUSY;

        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 ||
                    sc->sc_mixer_model == SBM_CT1XX5) {
                        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 (!ISSBM1745(sc))
                        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 (ISSBM1745(sc))
                        cp->un.mask = sc->in_mask;
                else
                        cp->un.ord = sc->in_port;
                break;

        case SB_AGC:
                if (!ISSBM1745(sc))
                        return EINVAL;
                cp->un.ord = sbdsp_mix_read(sc, SB16P_AGC);
                break;

        case SB_CD_IN_MUTE:
        case SB_MIC_IN_MUTE:
        case SB_LINE_IN_MUTE:
        case SB_MIDI_IN_MUTE:
        case SB_CD_SWAP:
        case SB_MIC_SWAP:
        case SB_LINE_SWAP:
        case SB_MIDI_SWAP:
        case SB_CD_OUT_MUTE:
        case SB_MIC_OUT_MUTE:
        case SB_LINE_OUT_MUTE:
                cp->un.ord = sc->gain[cp->dev][SB_LR];
                break;

        default:
                return EINVAL;
        }

        return 0;
}

int
sbdsp_mixer_query_devinfo(void *addr, mixer_devinfo_t *dip)
{
        struct sbdsp_softc *sc = addr;
        int chan, class, is1745;

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

        if (dip->index < 0)
                return ENXIO;

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

        chan = sc->sc_mixer_model == SBM_CT1335 ? 1 : 2;
        is1745 = ISSBM1745(sc);
        class = is1745 ? 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;
                strlcpy(dip->label.name, AudioNmaster, sizeof dip->label.name);
                dip->un.v.num_channels = chan;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                return 0;
        case SB_MIDI_VOL:
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = class;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = is1745 ? SB_MIDI_IN_MUTE : AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioNfmsynth, sizeof dip->label.name);
                dip->un.v.num_channels = chan;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                return 0;
        case SB_CD_VOL:
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = class;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = is1745 ? SB_CD_IN_MUTE : AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioNcd, sizeof dip->label.name);
                dip->un.v.num_channels = chan;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                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;
                strlcpy(dip->label.name, AudioNdac, sizeof dip->label.name);
                dip->un.v.num_channels = chan;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                return 0;
        case SB_OUTPUT_CLASS:
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = SB_OUTPUT_CLASS;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioCoutputs, sizeof dip->label.name);
                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 = is1745 ? SB_MIC_IN_MUTE : AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioNmicrophone,
                    sizeof dip->label.name);
                dip->un.v.num_channels = 1;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                return 0;

        case SB_LINE_IN_VOL:
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = class;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = is1745 ? SB_LINE_IN_MUTE : AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioNline, sizeof dip->label.name);
                dip->un.v.num_channels = 2;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                return 0;

        case SB_RECORD_SOURCE:
                dip->mixer_class = SB_RECORD_CLASS;
                dip->prev = dip->next = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioNsource, sizeof dip->label.name);
                if (ISSBM1745(sc)) {
                        dip->type = AUDIO_MIXER_SET;
                        dip->un.s.num_mem = 4;
                        strlcpy(dip->un.s.member[0].label.name,
                            AudioNmicrophone,
                            sizeof dip->un.s.member[0].label.name);
                        dip->un.s.member[0].mask = 1 << SB_MIC_VOL;
                        strlcpy(dip->un.s.member[1].label.name,
                            AudioNcd, sizeof dip->un.s.member[1].label.name);
                        dip->un.s.member[1].mask = 1 << SB_CD_VOL;
                        strlcpy(dip->un.s.member[2].label.name,
                            AudioNline, sizeof dip->un.s.member[2].label.name);
                        dip->un.s.member[2].mask = 1 << SB_LINE_IN_VOL;
                        strlcpy(dip->un.s.member[3].label.name,
                            AudioNfmsynth,
                            sizeof dip->un.s.member[3].label.name);
                        dip->un.s.member[3].mask = 1 << SB_MIDI_VOL;
                } else {
                        dip->type = AUDIO_MIXER_ENUM;
                        dip->un.e.num_mem = 3;
                        strlcpy(dip->un.e.member[0].label.name,
                            AudioNmicrophone,
                            sizeof dip->un.e.member[0].label.name);
                        dip->un.e.member[0].ord = SB_MIC_VOL;
                        strlcpy(dip->un.e.member[1].label.name, AudioNcd,
                            sizeof dip->un.e.member[1].label.name);
                        dip->un.e.member[1].ord = SB_CD_VOL;
                        strlcpy(dip->un.e.member[2].label.name, AudioNline,
                            sizeof dip->un.e.member[2].label.name);
                        dip->un.e.member[2].ord = SB_LINE_IN_VOL;
                }
                return 0;

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

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

        case SB_INPUT_CLASS:
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = SB_INPUT_CLASS;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioCinputs, sizeof dip->label.name);
                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;
                strlcpy(dip->label.name, "pc_speaker", sizeof dip->label.name);
                dip->un.v.num_channels = 1;
                strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
                return 0;

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

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

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

        case SB_EQUALIZATION_CLASS:
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = SB_EQUALIZATION_CLASS;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioCequalization, sizeof dip->label.name);
                return 0;

        case SB_CD_IN_MUTE:
                dip->prev = SB_CD_VOL;
                dip->next = SB_CD_SWAP;
                dip->mixer_class = SB_INPUT_CLASS;
                goto mute;

        case SB_MIC_IN_MUTE:
                dip->prev = SB_MIC_VOL;
                dip->next = SB_MIC_SWAP;
                dip->mixer_class = SB_INPUT_CLASS;
                goto mute;

        case SB_LINE_IN_MUTE:
                dip->prev = SB_LINE_IN_VOL;
                dip->next = SB_LINE_SWAP;
                dip->mixer_class = SB_INPUT_CLASS;
                goto mute;

        case SB_MIDI_IN_MUTE:
                dip->prev = SB_MIDI_VOL;
                dip->next = SB_MIDI_SWAP;
                dip->mixer_class = SB_INPUT_CLASS;
                goto mute;

        case SB_CD_SWAP:
                dip->prev = SB_CD_IN_MUTE;
                dip->next = SB_CD_OUT_MUTE;
                goto swap;

        case SB_MIC_SWAP:
                dip->prev = SB_MIC_IN_MUTE;
                dip->next = SB_MIC_OUT_MUTE;
                goto swap;

        case SB_LINE_SWAP:
                dip->prev = SB_LINE_IN_MUTE;
                dip->next = SB_LINE_OUT_MUTE;
                goto swap;

        case SB_MIDI_SWAP:
                dip->prev = SB_MIDI_IN_MUTE;
                dip->next = AUDIO_MIXER_LAST;
        swap:
                dip->mixer_class = SB_INPUT_CLASS;
                strlcpy(dip->label.name, AudioNswap, sizeof dip->label.name);
                goto mute1;

        case SB_CD_OUT_MUTE:
                dip->prev = SB_CD_SWAP;
                dip->next = AUDIO_MIXER_LAST;
                dip->mixer_class = SB_OUTPUT_CLASS;
                goto mute;

        case SB_MIC_OUT_MUTE:
                dip->prev = SB_MIC_SWAP;
                dip->next = AUDIO_MIXER_LAST;
                dip->mixer_class = SB_OUTPUT_CLASS;
                goto mute;

        case SB_LINE_OUT_MUTE:
                dip->prev = SB_LINE_SWAP;
                dip->next = AUDIO_MIXER_LAST;
                dip->mixer_class = SB_OUTPUT_CLASS;
        mute:
                strlcpy(dip->label.name, AudioNmute, sizeof dip->label.name);
        mute1:
                dip->type = AUDIO_MIXER_ENUM;
                dip->un.e.num_mem = 2;
                strlcpy(dip->un.e.member[0].label.name, AudioNoff,
                    sizeof dip->un.e.member[0].label.name);
                dip->un.e.member[0].ord = 0;
                strlcpy(dip->un.e.member[1].label.name, AudioNon,
                    sizeof dip->un.e.member[1].label.name);
                dip->un.e.member[1].ord = 1;
                return 0;

        }

        return ENXIO;
}

void *
sb_malloc(void *addr, int direction, size_t size, int pool, int flags)
{
        struct sbdsp_softc *sc = addr;
        int drq;

        /* 8-bit has more restrictive alignment */
        if (sc->sc_drq8 != -1)
                drq = sc->sc_drq8;
        else
                drq = sc->sc_drq16;

        return isa_malloc(sc->sc_isa, drq, size, pool, flags);
}

void
sb_free(void *addr, void *ptr, int pool)
{
        isa_free(ptr, pool);
}

size_t
sb_round(void *addr, int direction, size_t size)
{
        if (size > MAX_ISADMA)
                size = MAX_ISADMA;
        return size;
}

#if NMIDI > 0
/*
 * MIDI related routines.
 */

int
sbdsp_midi_open(void *addr, int flags, void (*iintr)(void *, int),
    void (*ointr)(void *), void *arg)
{
        struct sbdsp_softc *sc = addr;

        DPRINTF(("sbdsp_midi_open: sc=%p\n", sc));

        if (sc->sc_open != SB_CLOSED)
                return EBUSY;
        if (sbdsp_reset(sc) != 0)
                return EIO;

        if (sc->sc_model >= SB_20)
                if (sbdsp_wdsp(sc, SB_MIDI_UART_INTR)) /* enter UART mode */
                        return EIO;
        sc->sc_open = SB_OPEN_MIDI;
        sc->sc_openflags = flags;
        sc->sc_intr8 = sbdsp_midi_intr;
        sc->sc_arg8 = addr;
        sc->sc_intrm = iintr;
        sc->sc_argm = arg;
        return 0;
}

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

        DPRINTF(("sbdsp_midi_close: sc=%p\n", sc));

        if (sc->sc_model >= SB_20)
                sbdsp_reset(sc); /* exit UART mode */
        sc->sc_open = SB_CLOSED;
        sc->sc_intrm = 0;
}

int
sbdsp_midi_output(void *addr, int d)
{
        struct sbdsp_softc *sc = addr;

        if (sc->sc_model < SB_20 && sbdsp_wdsp(sc, SB_MIDI_WRITE))
                return 1;
        (void)sbdsp_wdsp(sc, d);
        return 1;
}

void
sbdsp_midi_getinfo(void *addr, struct midi_info *mi)
{
        struct sbdsp_softc *sc = addr;

        mi->name = sc->sc_model < SB_20 ? "SB MIDI cmd" : "SB MIDI UART";
        mi->props = MIDI_PROP_CAN_INPUT;
}

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

        sc->sc_intrm(sc->sc_argm, sbdsp_rdsp(sc));
        return (0);
}

#endif