/*      $OpenBSD: gus.c,v 1.57 2024/06/22 10:22:29 jsg Exp $    */
/*      $NetBSD: gus.c,v 1.51 1998/01/25 23:48:06 mycroft Exp $ */

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Ken Hornstein and John Kohl.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

/*
 *
 * TODO:
 *      . figure out why mixer activity while sound is playing causes problems
 *        (phantom interrupts?)
 *      . figure out a better deinterleave strategy that avoids sucking up
 *        CPU, memory and cache bandwidth.  (Maybe a special encoding?
 *        Maybe use the double-speed sampling/hardware deinterleave trick
 *        from the GUS SDK?)  A 486/33 isn't quite fast enough to keep
 *        up with 44.1kHz 16-bit stereo output without some drop-outs.
 *      . use CS4231 for 16-bit sampling, for a-law and mu-law playback.
 *      . actually test full-duplex sampling(recording) and playback.
 */

/*
 * Gravis UltraSound driver
 *
 * For more detailed information, see the GUS developers' kit
 * available on the net at:
 *
 * http://www.gravis.com/Public/sdk/GUSDK222.ZIP
 *
 *              See ultrawrd.doc inside--it's MS Word (ick), but it's the bible
 *
 */

/*
 * The GUS Max has a slightly strange set of connections between the CS4231
 * and the GF1 and the DMA interconnects.  It's set up so that the CS4231 can
 * be playing while the GF1 is loading patches from the system.
 *
 * Here's a recreation of the DMA interconnect diagram:
 *
 *       GF1
 *   +---------+                                 digital
 *   |         |  record                         ASIC
 *   |         |--------------+
 *   |         |              |                +--------+
 *   |         | play (dram)  |      +----+    |        |
 *   |         |--------------(------|-\  |    |   +-+  |
 *   +---------+              |      |  >-|----|---|C|--|------  dma chan 1
 *                            |  +---|-/  |    |   +-+  |
 *                            |  |   +----+    |    |   |
 *                            |  |   +----+    |    |   |
 *   +---------+        +-+   +--(---|-\  |    |    |   |
 *   |         | play   |8|      |   |  >-|----|----+---|------  dma chan 2
 *   | ---C----|--------|/|------(---|-/  |    |        |
 *   |    ^    |record  |1|      |   +----+    |        |
 *   |    |    |   /----|6|------+             +--------+
 *   | ---+----|--/     +-+
 *   +---------+
 *     CS4231   8-to-16 bit bus conversion, if needed
 *
 *
 * "C" is an optional combiner.
 *
 */

#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 <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/timeout.h>

#include <machine/cpu.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/cpufunc.h>
#include <sys/audioio.h>
#include <dev/audio_if.h>

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

#include <dev/ic/ics2101reg.h>
#include <dev/ic/cs4231reg.h>
#include <dev/ic/ad1848reg.h>
#include <dev/isa/ics2101var.h>
#include <dev/isa/ad1848var.h>
#include "gusreg.h"
#include "gusvar.h"

#ifdef AUDIO_DEBUG
#define GUSPLAYDEBUG    /*XXX*/
#define DPRINTF(x)      if (gusdebug) printf x
#define DMAPRINTF(x)    if (gusdmadebug) printf x
int     gusdebug = 0;
int     gusdmadebug = 0;
#else
#define DPRINTF(x)
#define DMAPRINTF(x)
#endif
int     gus_dostereo = 1;

#define NDMARECS 2048
#ifdef GUSPLAYDEBUG
int     gusstats = 0;

struct dma_record dmarecords[NDMARECS];

int dmarecord_index = 0;
#endif

struct cfdriver gus_cd = {
        NULL, "gus", DV_DULL
};

/*
 * A mapping from IRQ/DRQ values to the values used in the GUS's internal
 * registers.  A zero means that the referenced IRQ/DRQ is invalid
 */
const int gus_irq_map[] = {
        IRQUNK, IRQUNK, 1, 3, IRQUNK, 2, IRQUNK, 4, IRQUNK, 1, IRQUNK, 5, 6,
        IRQUNK, IRQUNK, 7
};
const int gus_drq_map[] = {
        DRQUNK, 1, DRQUNK, 2, DRQUNK, 3, 4, 5
};

/*
 * A list of valid base addresses for the GUS
 */

const int gus_base_addrs[] = {
        0x210, 0x220, 0x230, 0x240, 0x250, 0x260
};
const int gus_addrs = sizeof(gus_base_addrs) / sizeof(gus_base_addrs[0]);

/*
 * Maximum frequency values of the GUS based on the number of currently active
 * voices.  Since the GUS samples a voice every 1.6 us, the maximum frequency
 * is dependent on the number of active voices.  Yes, it is pretty weird.
 */

static const int gus_max_frequency[] = {
                44100,          /* 14 voices */
                41160,          /* 15 voices */
                38587,          /* 16 voices */
                36317,          /* 17 voices */
                34300,          /* 18 voices */
                32494,          /* 19 voices */
                30870,          /* 20 voices */
                29400,          /* 21 voices */
                28063,          /* 22 voices */
                26843,          /* 23 voices */
                25725,          /* 24 voices */
                24696,          /* 25 voices */
                23746,          /* 26 voices */
                22866,          /* 27 voices */
                22050,          /* 28 voices */
                21289,          /* 29 voices */
                20580,          /* 30 voices */
                19916,          /* 31 voices */
                19293           /* 32 voices */
};
/*
 * A mapping of linear volume levels to the logarithmic volume values used
 * by the GF1 chip on the GUS.  From GUS SDK vol1.c.
 */

static const unsigned short gus_log_volumes[512] = {
 0x0000,
 0x0700, 0x07ff, 0x0880, 0x08ff, 0x0940, 0x0980, 0x09c0, 0x09ff, 0x0a20,
 0x0a40, 0x0a60, 0x0a80, 0x0aa0, 0x0ac0, 0x0ae0, 0x0aff, 0x0b10, 0x0b20,
 0x0b30, 0x0b40, 0x0b50, 0x0b60, 0x0b70, 0x0b80, 0x0b90, 0x0ba0, 0x0bb0,
 0x0bc0, 0x0bd0, 0x0be0, 0x0bf0, 0x0bff, 0x0c08, 0x0c10, 0x0c18, 0x0c20,
 0x0c28, 0x0c30, 0x0c38, 0x0c40, 0x0c48, 0x0c50, 0x0c58, 0x0c60, 0x0c68,
 0x0c70, 0x0c78, 0x0c80, 0x0c88, 0x0c90, 0x0c98, 0x0ca0, 0x0ca8, 0x0cb0,
 0x0cb8, 0x0cc0, 0x0cc8, 0x0cd0, 0x0cd8, 0x0ce0, 0x0ce8, 0x0cf0, 0x0cf8,
 0x0cff, 0x0d04, 0x0d08, 0x0d0c, 0x0d10, 0x0d14, 0x0d18, 0x0d1c, 0x0d20,
 0x0d24, 0x0d28, 0x0d2c, 0x0d30, 0x0d34, 0x0d38, 0x0d3c, 0x0d40, 0x0d44,
 0x0d48, 0x0d4c, 0x0d50, 0x0d54, 0x0d58, 0x0d5c, 0x0d60, 0x0d64, 0x0d68,
 0x0d6c, 0x0d70, 0x0d74, 0x0d78, 0x0d7c, 0x0d80, 0x0d84, 0x0d88, 0x0d8c,
 0x0d90, 0x0d94, 0x0d98, 0x0d9c, 0x0da0, 0x0da4, 0x0da8, 0x0dac, 0x0db0,
 0x0db4, 0x0db8, 0x0dbc, 0x0dc0, 0x0dc4, 0x0dc8, 0x0dcc, 0x0dd0, 0x0dd4,
 0x0dd8, 0x0ddc, 0x0de0, 0x0de4, 0x0de8, 0x0dec, 0x0df0, 0x0df4, 0x0df8,
 0x0dfc, 0x0dff, 0x0e02, 0x0e04, 0x0e06, 0x0e08, 0x0e0a, 0x0e0c, 0x0e0e,
 0x0e10, 0x0e12, 0x0e14, 0x0e16, 0x0e18, 0x0e1a, 0x0e1c, 0x0e1e, 0x0e20,
 0x0e22, 0x0e24, 0x0e26, 0x0e28, 0x0e2a, 0x0e2c, 0x0e2e, 0x0e30, 0x0e32,
 0x0e34, 0x0e36, 0x0e38, 0x0e3a, 0x0e3c, 0x0e3e, 0x0e40, 0x0e42, 0x0e44,
 0x0e46, 0x0e48, 0x0e4a, 0x0e4c, 0x0e4e, 0x0e50, 0x0e52, 0x0e54, 0x0e56,
 0x0e58, 0x0e5a, 0x0e5c, 0x0e5e, 0x0e60, 0x0e62, 0x0e64, 0x0e66, 0x0e68,
 0x0e6a, 0x0e6c, 0x0e6e, 0x0e70, 0x0e72, 0x0e74, 0x0e76, 0x0e78, 0x0e7a,
 0x0e7c, 0x0e7e, 0x0e80, 0x0e82, 0x0e84, 0x0e86, 0x0e88, 0x0e8a, 0x0e8c,
 0x0e8e, 0x0e90, 0x0e92, 0x0e94, 0x0e96, 0x0e98, 0x0e9a, 0x0e9c, 0x0e9e,
 0x0ea0, 0x0ea2, 0x0ea4, 0x0ea6, 0x0ea8, 0x0eaa, 0x0eac, 0x0eae, 0x0eb0,
 0x0eb2, 0x0eb4, 0x0eb6, 0x0eb8, 0x0eba, 0x0ebc, 0x0ebe, 0x0ec0, 0x0ec2,
 0x0ec4, 0x0ec6, 0x0ec8, 0x0eca, 0x0ecc, 0x0ece, 0x0ed0, 0x0ed2, 0x0ed4,
 0x0ed6, 0x0ed8, 0x0eda, 0x0edc, 0x0ede, 0x0ee0, 0x0ee2, 0x0ee4, 0x0ee6,
 0x0ee8, 0x0eea, 0x0eec, 0x0eee, 0x0ef0, 0x0ef2, 0x0ef4, 0x0ef6, 0x0ef8,
 0x0efa, 0x0efc, 0x0efe, 0x0eff, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05,
 0x0f06, 0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
 0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16, 0x0f17,
 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e, 0x0f1f, 0x0f20,
 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26, 0x0f27, 0x0f28, 0x0f29,
 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e, 0x0f2f, 0x0f30, 0x0f31, 0x0f32,
 0x0f33, 0x0f34, 0x0f35, 0x0f36, 0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b,
 0x0f3c, 0x0f3d, 0x0f3e, 0x0f3f, 0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44,
 0x0f45, 0x0f46, 0x0f47, 0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d,
 0x0f4e, 0x0f4f, 0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56,
 0x0f57, 0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
 0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67, 0x0f68,
 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f, 0x0f70, 0x0f71,
 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77, 0x0f78, 0x0f79, 0x0f7a,
 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f, 0x0f80, 0x0f81, 0x0f82, 0x0f83,
 0x0f84, 0x0f85, 0x0f86, 0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c,
 0x0f8d, 0x0f8e, 0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95,
 0x0f96, 0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
 0x0f9f, 0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
 0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf, 0x0fb0,
 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7, 0x0fb8, 0x0fb9,
 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf, 0x0fc0, 0x0fc1, 0x0fc2,
 0x0fc3, 0x0fc4, 0x0fc5, 0x0fc6, 0x0fc7, 0x0fc8, 0x0fc9, 0x0fca, 0x0fcb,
 0x0fcc, 0x0fcd, 0x0fce, 0x0fcf, 0x0fd0, 0x0fd1, 0x0fd2, 0x0fd3, 0x0fd4,
 0x0fd5, 0x0fd6, 0x0fd7, 0x0fd8, 0x0fd9, 0x0fda, 0x0fdb, 0x0fdc, 0x0fdd,
 0x0fde, 0x0fdf, 0x0fe0, 0x0fe1, 0x0fe2, 0x0fe3, 0x0fe4, 0x0fe5, 0x0fe6,
 0x0fe7, 0x0fe8, 0x0fe9, 0x0fea, 0x0feb, 0x0fec, 0x0fed, 0x0fee, 0x0fef,
 0x0ff0, 0x0ff1, 0x0ff2, 0x0ff3, 0x0ff4, 0x0ff5, 0x0ff6, 0x0ff7, 0x0ff8,
 0x0ff9, 0x0ffa, 0x0ffb, 0x0ffc, 0x0ffd, 0x0ffe, 0x0fff};

/*
 * Interface to higher level audio driver
 */
const struct audio_hw_if gus_hw_if = {
        .open = gusopen,
        .close = gusclose,
        .set_params = gus_set_params,
        .round_blocksize = gus_round_blocksize,
        .commit_settings = gus_commit_settings,
        .start_output = gus_dma_output,
        .start_input = gus_dma_input,
        .halt_output = gus_halt_out_dma,
        .halt_input = gus_halt_in_dma,
        .set_port = gus_mixer_set_port,
        .get_port = gus_mixer_get_port,
        .query_devinfo = gus_mixer_query_devinfo,
        .allocm = gus_malloc,
        .freem = gus_free,
        .round_buffersize = gus_round,
};

static const struct audio_hw_if gusmax_hw_if = {
        .open = gusmaxopen,
        .close = gusmax_close,
        .set_params = gusmax_set_params,
        .round_blocksize = gusmax_round_blocksize,
        .commit_settings = gusmax_commit_settings,
        .start_output = gusmax_dma_output,
        .start_input = gusmax_dma_input,
        .halt_output = gusmax_halt_out_dma,
        .halt_input = gusmax_halt_in_dma,
        .set_port = gusmax_mixer_set_port,
        .get_port = gusmax_mixer_get_port,
        .query_devinfo = gusmax_mixer_query_devinfo,
        .allocm = ad1848_malloc,
        .freem = ad1848_free,
        .round_buffersize = ad1848_round,
};

int
gusopen(void *addr, int flags)
{
        struct gus_softc *sc = addr;

        DPRINTF(("gusopen() called\n"));

        if ((flags & (FWRITE | FREAD)) == (FWRITE | FREAD) &&
            sc->sc_recdrq == sc->sc_drq)
                return ENXIO;

        if (sc->sc_flags & GUS_OPEN)
                return EBUSY;

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

        /*
         * Some initialization
         */

        sc->sc_flags |= GUS_OPEN;
        sc->sc_dmabuf = 0;
        sc->sc_playbuf = -1;
        sc->sc_bufcnt = 0;
        sc->sc_voc[GUS_VOICE_LEFT].start_addr = GUS_MEM_OFFSET - 1;
        sc->sc_voc[GUS_VOICE_LEFT].current_addr = GUS_MEM_OFFSET;

        if (HAS_CODEC(sc)) {
                ad1848_open(&sc->sc_codec, flags);
                sc->sc_codec.mute[AD1848_AUX1_CHANNEL] = 0;
                ad1848_mute_channel(&sc->sc_codec, AD1848_AUX1_CHANNEL, 0); /* turn on DAC output */
                if (flags & FREAD) {
                        sc->sc_codec.mute[AD1848_MONO_CHANNEL] = 0;
                        ad1848_mute_channel(&sc->sc_codec, AD1848_MONO_CHANNEL, 0);
                }
        } else if (flags & FREAD) {
                /* enable/unmute the microphone */
                if (HAS_MIXER(sc)) {
                        gusics_mic_mute(&sc->sc_mixer, 0);
                } else
                        gus_mic_ctl(sc, SPKR_ON);
        }
        if (sc->sc_nbufs == 0)
            gus_round_blocksize(sc, GUS_BUFFER_MULTIPLE); /* default blksiz */
        return 0;
}

int
gusmaxopen(void *addr, int flags)
{
        struct ad1848_softc *ac = addr;
        return gusopen(ac->parent, flags);
}

void
gus_deinterleave(struct gus_softc *sc, void *buf, int size)
{
        /* deinterleave the stereo data.  We can use sc->sc_deintr_buf
           for scratch space. */
        int i;

        if (size > sc->sc_blocksize) {
                printf("gus: deinterleave %d > %d\n", size, sc->sc_blocksize);
                return;
        } else if (size < sc->sc_blocksize) {
                DPRINTF(("gus: deinterleave %d < %d\n", size, sc->sc_blocksize));
        }

        /*
         * size is in bytes.
         */
        if (sc->sc_precision == 16) {
                u_short *dei = sc->sc_deintr_buf;
                u_short *sbuf = buf;
                size >>= 1;             /* bytecnt to shortcnt */
                /* copy 2nd of each pair of samples to the staging area, while
                   compacting the 1st of each pair into the original area. */
                for (i = 0; i < size/2-1; i++)  {
                        dei[i] = sbuf[i*2+1];
                        sbuf[i+1] = sbuf[i*2+2];
                }
                /*
                 * this has copied one less sample than half of the
                 * buffer.  The first sample of the 1st stream was
                 * already in place and didn't need copying.
                 * Therefore, we've moved all of the 1st stream's
                 * samples into place.  We have one sample from 2nd
                 * stream in the last slot of original area, not
                 * copied to the staging area (But we don't need to!).
                 * Copy the remainder of the original stream into place.
                 */
                bcopy(dei, &sbuf[size/2], i * sizeof(short));
        } else {
                u_char *dei = sc->sc_deintr_buf;
                u_char *sbuf = buf;
                for (i = 0; i < size/2-1; i++)  {
                        dei[i] = sbuf[i*2+1];
                        sbuf[i+1] = sbuf[i*2+2];
                }
                bcopy(dei, &sbuf[size/2], i);
        }
}

/*
 * Actually output a buffer to the DSP chip
 */

int
gusmax_dma_output(void *addr, void *buf, int size, void (*intr)(void *),
    void *arg)
{
        struct ad1848_softc *ac = addr;
        return gus_dma_output(ac->parent, buf, size, intr, arg);
}

/*
 * called at splaudio() from interrupt handler.
 */
void
stereo_dmaintr(void *arg)
{
    struct gus_softc *sc = arg;
    struct stereo_dma_intr *sa = &sc->sc_stereo;

    DMAPRINTF(("stereo_dmaintr"));

    /*
     * Put other half in its place, then call the real interrupt routine :)
     */

    sc->sc_dmaoutintr = sa->intr;
    sc->sc_outarg = sa->arg;

#ifdef GUSPLAYDEBUG
    if (gusstats) {
      microtime(&dmarecords[dmarecord_index].tv);
      dmarecords[dmarecord_index].gusaddr = sa->dmabuf;
      dmarecords[dmarecord_index].bsdaddr = sa->buffer;
      dmarecords[dmarecord_index].count = sa->size;
      dmarecords[dmarecord_index].channel = 1;
      dmarecords[dmarecord_index++].direction = 1;
      dmarecord_index = dmarecord_index % NDMARECS;
    }
#endif

    gusdmaout(sc, sa->flags, sa->dmabuf, (caddr_t) sa->buffer, sa->size);

    sa->flags = 0;
    sa->dmabuf = 0;
    sa->buffer = 0;
    sa->size = 0;
    sa->intr = 0;
    sa->arg = 0;
}

/*
 * Start up DMA output to the card.
 * Called at splaudio(), either from intr handler or from
 * generic audio code.
 */
int
gus_dma_output(void *addr, void *buf, int size, void (*intr)(void *), void *arg)
{
        struct gus_softc *sc = addr;
        u_char *buffer = buf;
        u_long boarddma;
        int flags;

        DMAPRINTF(("gus_dma_output %d @ %p\n", size, buf));
        if (size != sc->sc_blocksize) {
            DPRINTF(("gus_dma_output reqsize %d not sc_blocksize %d\n",
                     size, sc->sc_blocksize));
            return EINVAL;
        }

        flags = GUSMASK_DMA_WRITE;
        if (sc->sc_precision == 16)
            flags |= GUSMASK_DMA_DATA_SIZE;
        if (sc->sc_encoding == AUDIO_ENCODING_ULAW ||
            sc->sc_encoding == AUDIO_ENCODING_ALAW ||
            sc->sc_encoding == AUDIO_ENCODING_ULINEAR_BE ||
            sc->sc_encoding == AUDIO_ENCODING_ULINEAR_LE)
            flags |= GUSMASK_DMA_INVBIT;

        if (sc->sc_channels == 2) {
                if (sc->sc_precision == 16) {
                        if (size & 3) {
                                DPRINTF(("gus_dma_output: unpaired 16bit samples"));
                                size &= 3;
                        }
                } else if (size & 1) {
                        DPRINTF(("gus_dma_output: unpaired samples"));
                        size &= 1;
                }
                if (size == 0) {
                        return 0;
                }

                gus_deinterleave(sc, (void *)buffer, size);

                size >>= 1;

                boarddma = size * sc->sc_dmabuf + GUS_MEM_OFFSET;

                sc->sc_stereo.intr = intr;
                sc->sc_stereo.arg = arg;
                sc->sc_stereo.size = size;
                sc->sc_stereo.dmabuf = boarddma + GUS_LEFT_RIGHT_OFFSET;
                sc->sc_stereo.buffer = buffer + size;
                sc->sc_stereo.flags = flags;
                if (gus_dostereo) {
                  intr = stereo_dmaintr;
                  arg = sc;
                }
        } else
                boarddma = size * sc->sc_dmabuf + GUS_MEM_OFFSET;


        sc->sc_flags |= GUS_LOCKED;
        sc->sc_dmaoutintr = intr;
        sc->sc_outarg = arg;

#ifdef GUSPLAYDEBUG
        if (gusstats) {
          microtime(&dmarecords[dmarecord_index].tv);
          dmarecords[dmarecord_index].gusaddr = boarddma;
          dmarecords[dmarecord_index].bsdaddr = buffer;
          dmarecords[dmarecord_index].count = size;
          dmarecords[dmarecord_index].channel = 0;
          dmarecords[dmarecord_index++].direction = 1;
          dmarecord_index = dmarecord_index % NDMARECS;
        }
#endif

        gusdmaout(sc, flags, boarddma, (caddr_t) buffer, size);
        return 0;
}

void
gusmax_close(void *addr)
{
        struct ad1848_softc *ac = addr;
        struct gus_softc *sc = ac->parent;
#if 0
        ac->mute[AD1848_AUX1_CHANNEL] = MUTE_ALL;
        ad1848_mute_channel(ac, MUTE_ALL); /* turn off DAC output */
#endif
        ad1848_close(ac);
        gusclose(sc);
}

/*
 * Close out device stuff.  Called at splaudio() from generic audio layer.
 */
void
gusclose(void *addr)
{
        struct gus_softc *sc = addr;

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

/*      if (sc->sc_flags & GUS_DMAOUT_ACTIVE) */ {
                gus_halt_out_dma(sc);
        }
/*      if (sc->sc_flags & GUS_DMAIN_ACTIVE) */ {
                gus_halt_in_dma(sc);
        }
        sc->sc_flags &= ~(GUS_OPEN|GUS_LOCKED|GUS_DMAOUT_ACTIVE|GUS_DMAIN_ACTIVE);

        if (sc->sc_deintr_buf) {
                free(sc->sc_deintr_buf, M_DEVBUF, 0);
                sc->sc_deintr_buf = NULL;
        }
        /* turn off speaker, etc. */

        /* make sure the voices shut up: */
        gus_stop_voice(sc, GUS_VOICE_LEFT, 1);
        gus_stop_voice(sc, GUS_VOICE_RIGHT, 0);
}

/*
 * Service interrupts.  Farm them off to helper routines if we are using the
 * GUS for simple playback/record
 */

#ifdef AUDIO_DEBUG
int gusintrcnt;
int gusdmaintrcnt;
int gusvocintrcnt;
#endif

int
gusintr(void *arg)
{
        struct gus_softc *sc = arg;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh1 = sc->sc_ioh1;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        unsigned char intr;

        int retval = 0;

        DPRINTF(("gusintr\n"));
#ifdef AUDIO_DEBUG
        gusintrcnt++;
#endif
        if (HAS_CODEC(sc))
                retval = ad1848_intr(&sc->sc_codec);
        mtx_enter(&audio_lock);
        if ((intr = bus_space_read_1(iot, ioh1, GUS_IRQ_STATUS)) & GUSMASK_IRQ_DMATC) {
                DMAPRINTF(("gusintr dma flags=%x\n", sc->sc_flags));
#ifdef AUDIO_DEBUG
                gusdmaintrcnt++;
#endif
                retval += gus_dmaout_intr(sc);
                if (sc->sc_flags & GUS_DMAIN_ACTIVE) {
                    SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_CONTROL);
                    intr = bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);
                    if (intr & GUSMASK_SAMPLE_DMATC) {
                        retval += gus_dmain_intr(sc);
                    }
                }
        }
        if (intr & (GUSMASK_IRQ_VOICE | GUSMASK_IRQ_VOLUME)) {
                DMAPRINTF(("gusintr voice flags=%x\n", sc->sc_flags));
#ifdef AUDIO_DEBUG
                gusvocintrcnt++;
#endif
                retval += gus_voice_intr(sc);
        }
        if (retval) {
                mtx_leave(&audio_lock);
                return 1;
        }
        mtx_leave(&audio_lock);
        return retval;
}

int gus_bufcnt[GUS_MEM_FOR_BUFFERS / GUS_BUFFER_MULTIPLE];
int gus_restart;                                /* how many restarts? */
int gus_stops;                          /* how many times did voice stop? */
int gus_falsestops;                     /* stopped but not done? */
int gus_continues;

struct playcont {
        struct timeval tv;
        u_int playbuf;
        u_int dmabuf;
        u_char bufcnt;
        u_char vaction;
        u_char voccntl;
        u_char volcntl;
        u_long curaddr;
        u_long endaddr;
} playstats[NDMARECS];

int playcntr;

void
gus_dmaout_timeout(void *arg)
{
        struct gus_softc *sc = arg;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        printf("%s: dmaout timeout\n", sc->sc_dev.dv_xname);
        /*
         * Stop any DMA.
         */

        mtx_enter(&audio_lock);
        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0);
 
#if 0
        /* XXX we will dmadone below? */
        isa_dmaabort(sc->sc_dev.dv_parent, sc->sc_drq);
#endif
 
        gus_dmaout_dointr(sc);
        mtx_leave(&audio_lock);
}


/*
 * Service DMA interrupts.  This routine will only get called if we're doing
 * a DMA transfer for playback/record requests from the audio layer.
 */

int
gus_dmaout_intr(struct gus_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        /*
         * If we got a DMA transfer complete from the GUS DRAM, then deal
         * with it.
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        if (bus_space_read_1(iot, ioh2, GUS_DATA_HIGH) & GUSMASK_DMA_IRQPEND) {
            timeout_del(&sc->sc_dma_tmo);
            gus_dmaout_dointr(sc);
            return 1;
        }
        return 0;
}

void
gus_dmaout_dointr(struct gus_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        /* sc->sc_dmaoutcnt - 1 because DMA controller counts from zero?. */
        isa_dmadone(sc->sc_dev.dv_parent, sc->sc_drq);
        sc->sc_flags &= ~GUS_DMAOUT_ACTIVE;  /* pending DMA is done */
        DMAPRINTF(("gus_dmaout_dointr %d @ %p\n", sc->sc_dmaoutcnt,
                   sc->sc_dmaoutaddr));

        /*
         * to prevent clicking, we need to copy last sample
         * from last buffer to scratch area just before beginning of
         * buffer.  However, if we're doing formats that are converted by
         * the card during the DMA process, we need to pick up the converted
         * byte rather than the one we have in memory.
         */
        if (sc->sc_dmabuf == sc->sc_nbufs - 1) {
          int i;
          switch (sc->sc_encoding) {
          case AUDIO_ENCODING_SLINEAR_LE:
          case AUDIO_ENCODING_SLINEAR_BE:
            if (sc->sc_precision == 8)
              goto byte;
            /* we have the native format */
            for (i = 1; i <= 2; i++)
              guspoke(iot, ioh2, sc->sc_gusaddr -
                      (sc->sc_nbufs - 1) * sc->sc_chanblocksize - i,
                      sc->sc_dmaoutaddr[sc->sc_dmaoutcnt-i]);
            break;
          case AUDIO_ENCODING_ULINEAR_LE:
          case AUDIO_ENCODING_ULINEAR_BE:
            guspoke(iot, ioh2, sc->sc_gusaddr -
                    (sc->sc_nbufs - 1) * sc->sc_chanblocksize - 2,
                    guspeek(iot, ioh2,
                            sc->sc_gusaddr + sc->sc_chanblocksize - 2));
          case AUDIO_ENCODING_ALAW:
          case AUDIO_ENCODING_ULAW:
          byte:
            /* we need to fetch the translated byte, then stuff it. */
            guspoke(iot, ioh2, sc->sc_gusaddr -
                    (sc->sc_nbufs - 1) * sc->sc_chanblocksize - 1,
                    guspeek(iot, ioh2,
                            sc->sc_gusaddr + sc->sc_chanblocksize - 1));
            break;
          }
        }
        /*
         * If this is the first half of stereo, "ignore" this one
         * and copy out the second half.
         */
        if (sc->sc_dmaoutintr == stereo_dmaintr) {
            (*sc->sc_dmaoutintr)(sc->sc_outarg);
            return;
        }
        /*
         * If the voice is stopped, then start it.  Reset the loop
         * and roll bits.  Call the audio layer routine, since if
         * we're starting a stopped voice, that means that the next
         * buffer can be filled
         */

        sc->sc_flags &= ~GUS_LOCKED;
        if (sc->sc_voc[GUS_VOICE_LEFT].voccntl &
            GUSMASK_VOICE_STOPPED) {
            if (sc->sc_flags & GUS_PLAYING) {
                printf("%s: playing yet stopped?\n", sc->sc_dev.dv_xname);
            }
            sc->sc_bufcnt++; /* another yet to be played */
            gus_start_playing(sc, sc->sc_dmabuf);
            gus_restart++;
        } else {
            /*
             * set the sound action based on which buffer we
             * just transferred.  If we just transferred buffer 0
             * we want the sound to loop when it gets to the nth
             * buffer; if we just transferred
             * any other buffer, we want the sound to roll over
             * at least one more time.  The voice interrupt
             * handlers will take care of accounting &
             * setting control bits if it's not caught up to us
             * yet.
             */
            if (++sc->sc_bufcnt == 2) {
                /*
                 * XXX
                 * If we're too slow in reaction here,
                 * the voice could be just approaching the
                 * end of its run.  It should be set to stop,
                 * so these adjustments might not DTRT.
                 */
                if (sc->sc_dmabuf == 0 &&
                    sc->sc_playbuf == sc->sc_nbufs - 1) {
                    /* player is just at the last buf, we're at the
                       first.  Turn on looping, turn off rolling. */
                    sc->sc_voc[GUS_VOICE_LEFT].voccntl |= GUSMASK_LOOP_ENABLE;
                    sc->sc_voc[GUS_VOICE_LEFT].volcntl &= ~GUSMASK_VOICE_ROLL;
                    playstats[playcntr].vaction = 3;
                } else {
                    /* player is at previous buf:
                       turn on rolling, turn off looping */
                    sc->sc_voc[GUS_VOICE_LEFT].voccntl &= ~GUSMASK_LOOP_ENABLE;
                    sc->sc_voc[GUS_VOICE_LEFT].volcntl |= GUSMASK_VOICE_ROLL;
                    playstats[playcntr].vaction = 4;
                }
#ifdef GUSPLAYDEBUG
                if (gusstats) {
                  microtime(&playstats[playcntr].tv);
                  playstats[playcntr].endaddr = sc->sc_voc[GUS_VOICE_LEFT].end_addr;
                  playstats[playcntr].voccntl = sc->sc_voc[GUS_VOICE_LEFT].voccntl;
                  playstats[playcntr].volcntl = sc->sc_voc[GUS_VOICE_LEFT].volcntl;
                  playstats[playcntr].playbuf = sc->sc_playbuf;
                  playstats[playcntr].dmabuf = sc->sc_dmabuf;
                  playstats[playcntr].bufcnt = sc->sc_bufcnt;
                  playstats[playcntr++].curaddr = gus_get_curaddr(sc, GUS_VOICE_LEFT);
                  playcntr = playcntr % NDMARECS;
                }
#endif
                bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, GUS_VOICE_LEFT);
                SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[GUS_VOICE_LEFT].voccntl);
                SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[GUS_VOICE_LEFT].volcntl);
            }
        }
        gus_bufcnt[sc->sc_bufcnt-1]++;
        /*
         * flip to the next DMA buffer
         */

        sc->sc_dmabuf = (sc->sc_dmabuf + 1) % sc->sc_nbufs;
        /*
         * See comments below about DMA admission control strategy.
         * We can call the upper level here if we have an
         * idle buffer (not currently playing) to DMA into.
         */
        if (sc->sc_dmaoutintr && sc->sc_bufcnt < sc->sc_nbufs) {
            /* clean out to prevent double calls */
            void (*pfunc)(void *) = sc->sc_dmaoutintr;
            void *arg = sc->sc_outarg;

            sc->sc_outarg = 0;
            sc->sc_dmaoutintr = 0;
            (*pfunc)(arg);
        }
}

/*
 * Service voice interrupts
 */

int
gus_voice_intr(struct gus_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        int ignore = 0, voice, rval = 0;
        unsigned char intr, status;

        /*
         * The point of this may not be obvious at first.  A voice can
         * interrupt more than once; according to the GUS SDK we are supposed
         * to ignore multiple interrupts for the same voice.
         */

        while(1) {
                SELECT_GUS_REG(iot, ioh2, GUSREG_IRQ_STATUS);
                intr = bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);

                if ((intr & (GUSMASK_WIRQ_VOLUME | GUSMASK_WIRQ_VOICE))
                        == (GUSMASK_WIRQ_VOLUME | GUSMASK_WIRQ_VOICE))
                        /*
                         * No more interrupts, time to return
                         */
                        return rval;

                if ((intr & GUSMASK_WIRQ_VOICE) == 0) {

                    /*
                     * We've got a voice interrupt.  Ignore previous
                     * interrupts by the same voice.
                     */

                    rval = 1;
                    voice = intr & GUSMASK_WIRQ_VOICEMASK;

                    if ((1 << voice) & ignore)
                        break;

                    ignore |= 1 << voice;

                    /*
                     * If the voice is stopped, then force it to stop
                     * (this stops it from continuously generating IRQs)
                     */

                    SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL+0x80);
                    status = bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);
                    if (status & GUSMASK_VOICE_STOPPED) {
                        if (voice != GUS_VOICE_LEFT) {
                            DMAPRINTF(("%s: spurious voice %d stop?\n",
                                       sc->sc_dev.dv_xname, voice));
                            gus_stop_voice(sc, voice, 0);
                            continue;
                        }
                        gus_stop_voice(sc, voice, 1);
                        /* also kill right voice */
                        gus_stop_voice(sc, GUS_VOICE_RIGHT, 0);
                        sc->sc_bufcnt--; /* it finished a buffer */
                        if (sc->sc_bufcnt > 0) {
                            /*
                             * probably a race to get here: the voice
                             * stopped while the DMA code was just trying to
                             * get the next buffer in place.
                             * Start the voice again.
                             */
                            printf("%s: stopped voice not drained? (%x)\n",
                                   sc->sc_dev.dv_xname, sc->sc_bufcnt);
                            gus_falsestops++;

                            sc->sc_playbuf = (sc->sc_playbuf + 1) % sc->sc_nbufs;
                            gus_start_playing(sc, sc->sc_playbuf);
                        } else if (sc->sc_bufcnt < 0) {
                            panic("%s: negative bufcnt in stopped voice",
                                   sc->sc_dev.dv_xname);
                        } else {
                            sc->sc_playbuf = -1; /* none are active */
                            gus_stops++;
                        }
                        /* fall through to callback and admit another
                           buffer.... */
                    } else if (sc->sc_bufcnt != 0) {
                        /*
                         * This should always be taken if the voice
                         * is not stopped.
                         */
                        gus_continues++;
                        if (gus_continue_playing(sc, voice)) {
                                /*
                                 * we shouldn't have continued--active DMA
                                 * is in the way in the ring, for
                                 * some as-yet undebugged reason.
                                 */
                                gus_stop_voice(sc, GUS_VOICE_LEFT, 1);
                                /* also kill right voice */
                                gus_stop_voice(sc, GUS_VOICE_RIGHT, 0);
                                sc->sc_playbuf = -1;
                                gus_stops++;
                        }
                    }
                    /*
                     * call the upper level to send on down another
                     * block. We do admission rate control as follows:
                     *
                     * When starting up output (in the first N
                     * blocks), call the upper layer after the DMA is
                     * complete (see above in gus_dmaout_intr()).
                     *
                     * When output is already in progress and we have
                     * no more GUS buffers to use for DMA, the DMA
                     * output routines do not call the upper layer.
                     * Instead, we call the DMA completion routine
                     * here, after the voice interrupts indicating
                     * that it's finished with a buffer.
                     *
                     * However, don't call anything here if the DMA
                     * output flag is set, (which shouldn't happen)
                     * because we'll squish somebody else's DMA if
                     * that's the case.  When DMA is done, it will
                     * call back if there is a spare buffer.
                     */
                    if (sc->sc_dmaoutintr && !(sc->sc_flags & GUS_LOCKED)) {
                        if (sc->sc_dmaoutintr == stereo_dmaintr)
                            printf("gusdmaout botch?\n");
                        else {
                            /* clean out to avoid double calls */
                            void (*pfunc)(void *) = sc->sc_dmaoutintr;
                            void *arg = sc->sc_outarg;

                            sc->sc_outarg = 0;
                            sc->sc_dmaoutintr = 0;
                            (*pfunc)(arg);
                        }
                    }
                }

                /*
                 * Ignore other interrupts for now
                 */
        }
        return 0;
}

void
gus_start_playing(struct gus_softc *sc, int bufno)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        /*
         * Start the voices playing, with buffer BUFNO.
         */

        /*
         * Loop or roll if we have buffers ready.
         */

        if (sc->sc_bufcnt == 1) {
                sc->sc_voc[GUS_VOICE_LEFT].voccntl &= ~(GUSMASK_LOOP_ENABLE);
                sc->sc_voc[GUS_VOICE_LEFT].volcntl &= ~(GUSMASK_VOICE_ROLL);
        } else {
                if (bufno == sc->sc_nbufs - 1) {
                        sc->sc_voc[GUS_VOICE_LEFT].voccntl |= GUSMASK_LOOP_ENABLE;
                        sc->sc_voc[GUS_VOICE_LEFT].volcntl &= ~(GUSMASK_VOICE_ROLL);
                } else {
                        sc->sc_voc[GUS_VOICE_LEFT].voccntl &= ~GUSMASK_LOOP_ENABLE;
                        sc->sc_voc[GUS_VOICE_LEFT].volcntl |= GUSMASK_VOICE_ROLL;
                }
        }

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, GUS_VOICE_LEFT);

        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[GUS_VOICE_LEFT].voccntl);

        SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[GUS_VOICE_LEFT].volcntl);

        sc->sc_voc[GUS_VOICE_LEFT].current_addr =
                GUS_MEM_OFFSET + sc->sc_chanblocksize * bufno;
        sc->sc_voc[GUS_VOICE_LEFT].end_addr =
                sc->sc_voc[GUS_VOICE_LEFT].current_addr + sc->sc_chanblocksize - 1;
        sc->sc_voc[GUS_VOICE_RIGHT].current_addr =
                sc->sc_voc[GUS_VOICE_LEFT].current_addr +
                (gus_dostereo && sc->sc_channels == 2 ? GUS_LEFT_RIGHT_OFFSET : 0);
        /*
         * set up right channel to just loop forever, no interrupts,
         * starting at the buffer we just filled.  We'll feed it data
         * at the same time as left channel.
         */
        sc->sc_voc[GUS_VOICE_RIGHT].voccntl |= GUSMASK_LOOP_ENABLE;
        sc->sc_voc[GUS_VOICE_RIGHT].volcntl &= ~(GUSMASK_VOICE_ROLL);

#ifdef GUSPLAYDEBUG
        if (gusstats) {
                microtime(&playstats[playcntr].tv);
                playstats[playcntr].curaddr = sc->sc_voc[GUS_VOICE_LEFT].current_addr;

                playstats[playcntr].voccntl = sc->sc_voc[GUS_VOICE_LEFT].voccntl;
                playstats[playcntr].volcntl = sc->sc_voc[GUS_VOICE_LEFT].volcntl;
                playstats[playcntr].endaddr = sc->sc_voc[GUS_VOICE_LEFT].end_addr;
                playstats[playcntr].playbuf = bufno;
                playstats[playcntr].dmabuf = sc->sc_dmabuf;
                playstats[playcntr].bufcnt = sc->sc_bufcnt;
                playstats[playcntr++].vaction = 5;
                playcntr = playcntr % NDMARECS;
        }
#endif

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, GUS_VOICE_RIGHT);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[GUS_VOICE_RIGHT].voccntl);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[GUS_VOICE_RIGHT].volcntl);

        gus_start_voice(sc, GUS_VOICE_RIGHT, 0);
        gus_start_voice(sc, GUS_VOICE_LEFT, 1);
        if (sc->sc_playbuf == -1)
                /* mark start of playing */
                sc->sc_playbuf = bufno;
}

int
gus_continue_playing(struct gus_softc *sc, int voice)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        /*
         * stop this voice from interrupting while we work.
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].voccntl & ~(GUSMASK_VOICE_IRQ));

        /*
         * update playbuf to point to the buffer the hardware just started
         * playing
         */
        sc->sc_playbuf = (sc->sc_playbuf + 1) % sc->sc_nbufs;

        /*
         * account for buffer just finished
         */
        if (--sc->sc_bufcnt == 0) {
                DPRINTF(("gus: bufcnt 0 on continuing voice?\n"));
        }
        if (sc->sc_playbuf == sc->sc_dmabuf && (sc->sc_flags & GUS_LOCKED)) {
                printf("%s: continue into active dmabuf?\n", sc->sc_dev.dv_xname);
                return 1;
        }

        /*
         * Select the end of the buffer based on the currently active
         * buffer, [plus extra contiguous buffers (if ready)].
         */

        /*
         * set endpoint at end of buffer we just started playing.
         *
         * The total gets -1 because end addrs are one less than you might
         * think (the end_addr is the address of the last sample to play)
         */
        gus_set_endaddr(sc, voice, GUS_MEM_OFFSET +
                        sc->sc_chanblocksize * (sc->sc_playbuf + 1) - 1);

        if (sc->sc_bufcnt < 2) {
                /*
                 * Clear out the loop and roll flags, and rotate the currently
                 * playing buffer.  That way, if we don't manage to get more
                 * data before this buffer finishes, we'll just stop.
                 */
                sc->sc_voc[voice].voccntl &= ~GUSMASK_LOOP_ENABLE;
                sc->sc_voc[voice].volcntl &= ~GUSMASK_VOICE_ROLL;
                playstats[playcntr].vaction = 0;
        } else {
                /*
                 * We have some buffers to play.  set LOOP if we're on the
                 * last buffer in the ring, otherwise set ROLL.
                 */
                if (sc->sc_playbuf == sc->sc_nbufs - 1) {
                        sc->sc_voc[voice].voccntl |= GUSMASK_LOOP_ENABLE;
                        sc->sc_voc[voice].volcntl &= ~GUSMASK_VOICE_ROLL;
                        playstats[playcntr].vaction = 1;
                } else {
                        sc->sc_voc[voice].voccntl &= ~GUSMASK_LOOP_ENABLE;
                        sc->sc_voc[voice].volcntl |= GUSMASK_VOICE_ROLL;
                        playstats[playcntr].vaction = 2;
                }
        }
#ifdef GUSPLAYDEBUG
        if (gusstats) {
                microtime(&playstats[playcntr].tv);
                playstats[playcntr].curaddr = gus_get_curaddr(sc, voice);

                playstats[playcntr].voccntl = sc->sc_voc[voice].voccntl;
                playstats[playcntr].volcntl = sc->sc_voc[voice].volcntl;
                playstats[playcntr].endaddr = sc->sc_voc[voice].end_addr;
                playstats[playcntr].playbuf = sc->sc_playbuf;
                playstats[playcntr].dmabuf = sc->sc_dmabuf;
                playstats[playcntr++].bufcnt = sc->sc_bufcnt;
                playcntr = playcntr % NDMARECS;
        }
#endif

        /*
         * (re-)set voice parameters.  This will reenable interrupts from this
         * voice.
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].voccntl);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].volcntl);
        return 0;
}

/*
 * Send/receive data into GUS's DRAM using DMA.  Called at splaudio()
 */

void
gusdmaout(struct gus_softc *sc, int flags, u_long gusaddr, caddr_t buffaddr,
    int length)
{
        unsigned char c = (unsigned char) flags;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        DMAPRINTF(("gusdmaout flags=%x scflags=%x\n", flags, sc->sc_flags));

        sc->sc_gusaddr = gusaddr;

        /*
         * If we're using a 16 bit DMA channel, we have to jump through some
         * extra hoops; this includes translating the DRAM address a bit
         */

        if (sc->sc_drq >= 4) {
                c |= GUSMASK_DMA_WIDTH;
                gusaddr = convert_to_16bit(gusaddr);
        }

        /*
         * Add flag bits that we always set - fast DMA, enable IRQ
         */

        c |= GUSMASK_DMA_ENABLE | GUSMASK_DMA_R0 | GUSMASK_DMA_IRQ;

        /*
         * Make sure the GUS _isn't_ setup for DMA
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0);

        /*
         * Tell the PC DMA controller to start doing DMA
         */

        sc->sc_dmaoutaddr = (u_char *) buffaddr;
        sc->sc_dmaoutcnt = length;
        isa_dmastart(sc->sc_dev.dv_parent, sc->sc_drq, buffaddr, length,
            NULL, DMAMODE_WRITE, BUS_DMA_NOWAIT);

        /*
         * Set up DMA address - use the upper 16 bits ONLY
         */

        sc->sc_flags |= GUS_DMAOUT_ACTIVE;

        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_START);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, (int) (gusaddr >> 4));

        /*
         * Tell the GUS to start doing DMA
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, c);

        /*
         * XXX If we don't finish in one second, give up...
         */
        timeout_add_sec(&sc->sc_dma_tmo, 1);
}

/*
 * Start a voice playing on the GUS.  Called from interrupt handler at
 * splaudio().
 */

void
gus_start_voice(struct gus_softc *sc, int voice, int intrs)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        u_long start;
        u_long current;
        u_long end;

        /*
         * Pick all the values for the voice out of the gus_voice struct
         * and use those to program the voice
         */

        start = sc->sc_voc[voice].start_addr;
        current = sc->sc_voc[voice].current_addr;
        end = sc->sc_voc[voice].end_addr;

        /*
         * If we're using 16 bit data, mangle the addresses a bit
         */

        if (sc->sc_voc[voice].voccntl & GUSMASK_DATA_SIZE16) {
                /* -1 on start so that we get onto sample boundary--other
                   code always sets it for 1-byte rollover protection */
                start = convert_to_16bit(start-1);
                current = convert_to_16bit(current);
                end = convert_to_16bit(end);
        }

        /*
         * Select the voice we want to use, and program the data addresses
         */

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) voice);

        SELECT_GUS_REG(iot, ioh2, GUSREG_START_ADDR_HIGH);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_HIGH(start));
        SELECT_GUS_REG(iot, ioh2, GUSREG_START_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(start));

        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_HIGH);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_HIGH(current));
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(current));

        SELECT_GUS_REG(iot, ioh2, GUSREG_END_ADDR_HIGH);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_HIGH(end));
        SELECT_GUS_REG(iot, ioh2, GUSREG_END_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(end));

        /*
         * (maybe) enable interrupts, disable voice stopping
         */

        if (intrs) {
                sc->sc_flags |= GUS_PLAYING; /* playing is about to start */
                sc->sc_voc[voice].voccntl |= GUSMASK_VOICE_IRQ;
                DMAPRINTF(("gus voice playing=%x\n", sc->sc_flags));
        } else
                sc->sc_voc[voice].voccntl &= ~GUSMASK_VOICE_IRQ;
        sc->sc_voc[voice].voccntl &= ~(GUSMASK_VOICE_STOPPED |
                GUSMASK_STOP_VOICE);

        /*
         * Tell the GUS about it.  Note that we're doing volume ramping here
         * from 0 up to the set volume to help reduce clicks.
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_START_VOLUME);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);
        SELECT_GUS_REG(iot, ioh2, GUSREG_END_VOLUME);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].current_volume >> 4);
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_VOLUME);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x00);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_RATE);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 63);

        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].voccntl);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);
        delay(50);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].voccntl);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);

}

/*
 * Stop a given voice.  Called at splaudio().
 */

void
gus_stop_voice(struct gus_softc *sc, int voice, int intrs_too)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        sc->sc_voc[voice].voccntl |= GUSMASK_VOICE_STOPPED |
                GUSMASK_STOP_VOICE;
        if (intrs_too) {
          sc->sc_voc[voice].voccntl &= ~(GUSMASK_VOICE_IRQ);
          /* no more DMA to do */
          sc->sc_flags &= ~GUS_PLAYING;
        }
        DMAPRINTF(("gusintr voice notplaying=%x\n", sc->sc_flags));

        guspoke(iot, ioh2, 0L, 0);

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) voice);

        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_VOLUME);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].voccntl);
        delay(100);
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_VOLUME);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
        SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[voice].voccntl);

        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_HIGH);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);

}


/*
 * Set the volume of a given voice.  Called at splaudio().
 */
void
gus_set_volume(struct gus_softc *sc, int voice, int volume)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        unsigned int gusvol;

        gusvol = gus_log_volumes[volume < 512 ? volume : 511];

        sc->sc_voc[voice].current_volume = gusvol;

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) voice);

        SELECT_GUS_REG(iot, ioh2, GUSREG_START_VOLUME);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, (unsigned char) (gusvol >> 4));

        SELECT_GUS_REG(iot, ioh2, GUSREG_END_VOLUME);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, (unsigned char) (gusvol >> 4));

        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_VOLUME);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, gusvol << 4);
        delay(500);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, gusvol << 4);

}

/*
 * Interface to the audio layer.
 */

int
gusmax_set_params(void *addr, int setmode, int usemode, struct audio_params *p,
    struct audio_params *r)
{
        struct ad1848_softc *ac = addr;
        struct gus_softc *sc = ac->parent;
        int error;

        error = ad1848_set_params(ac, setmode, usemode, p, r);
        if (error)
                return error;
        error = gus_set_params(sc, setmode, usemode, p, r);
        return error;
}

int
gus_set_params(void *addr, int setmode, int usemode, struct audio_params *p,
    struct audio_params *r)
{
        struct gus_softc *sc = addr;

        switch (p->encoding) {
        case AUDIO_ENCODING_SLINEAR_LE:
        case AUDIO_ENCODING_ULINEAR_LE:
                break;
        default:
                return (EINVAL);
        }

        /* XXX: why?! this is called with interrupts disabled */
        mtx_enter(&audio_lock);

        if (p->precision == 8) {
                sc->sc_voc[GUS_VOICE_LEFT].voccntl &= ~GUSMASK_DATA_SIZE16;
                sc->sc_voc[GUS_VOICE_RIGHT].voccntl &= ~GUSMASK_DATA_SIZE16;
        } else {
                sc->sc_voc[GUS_VOICE_LEFT].voccntl |= GUSMASK_DATA_SIZE16;
                sc->sc_voc[GUS_VOICE_RIGHT].voccntl |= GUSMASK_DATA_SIZE16;
        }

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

        mtx_leave(&audio_lock);

        if (p->sample_rate > gus_max_frequency[sc->sc_voices - GUS_MIN_VOICES])
                p->sample_rate = gus_max_frequency[sc->sc_voices - GUS_MIN_VOICES];
        if (setmode & AUMODE_RECORD)
                sc->sc_irate = p->sample_rate;
        if (setmode & AUMODE_PLAY)
                sc->sc_orate = p->sample_rate;

        p->bps = AUDIO_BPS(p->precision);
        r->bps = AUDIO_BPS(r->precision);
        p->msb = r->msb = 1;

        return 0;
}

/*
 * Interface to the audio layer - set the blocksize to the correct number
 * of units
 */

int
gusmax_round_blocksize(void *addr, int blocksize)
{
        struct ad1848_softc *ac = addr;
        struct gus_softc *sc = ac->parent;

/*      blocksize = ad1848_round_blocksize(ac, blocksize);*/
        return gus_round_blocksize(sc, blocksize);
}

int
gus_round_blocksize(void *addr, int blocksize)
{
        struct gus_softc *sc = addr;

        DPRINTF(("gus_round_blocksize called\n"));

        if ((sc->sc_encoding == AUDIO_ENCODING_ULAW ||
             sc->sc_encoding == AUDIO_ENCODING_ALAW) && blocksize > 32768)
                blocksize = 32768;
        else if (blocksize > 65536)
                blocksize = 65536;

        if ((blocksize % GUS_BUFFER_MULTIPLE) != 0)
                blocksize = (blocksize / GUS_BUFFER_MULTIPLE + 1) *
                        GUS_BUFFER_MULTIPLE;

        /* set up temporary buffer to hold the deinterleave, if necessary
           for stereo output */
        if (sc->sc_deintr_buf) {
                free(sc->sc_deintr_buf, M_DEVBUF, 0);
                sc->sc_deintr_buf = NULL;
        }
        sc->sc_deintr_buf = malloc(blocksize/2, M_DEVBUF, M_WAITOK);

        sc->sc_blocksize = blocksize;
        /* multi-buffering not quite working yet. */
        sc->sc_nbufs = /*GUS_MEM_FOR_BUFFERS / blocksize*/ 2;

        gus_set_chan_addrs(sc);

        return blocksize;
}

int
gus_get_out_gain(caddr_t addr)
{
        struct gus_softc *sc = (struct gus_softc *) addr;

        DPRINTF(("gus_get_out_gain called\n"));
        return sc->sc_ogain / 2;
}

inline void
gus_set_voices(struct gus_softc *sc, int voices)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        /*
         * Select the active number of voices
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_ACTIVE_VOICES);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, (voices-1) | 0xc0);

        sc->sc_voices = voices;
}

/*
 * Actually set the settings of various values on the card
 */

int
gusmax_commit_settings(void *addr)
{
        struct ad1848_softc *ac = addr;
        struct gus_softc *sc = ac->parent;
        int error;

        error = ad1848_commit_settings(ac);
        if (error)
                return error;
        return gus_commit_settings(sc);
}

/*
 * Commit the settings.  Called at normal IPL.
 */
int
gus_commit_settings(void *addr)
{
        struct gus_softc *sc = addr;

        DPRINTF(("gus_commit_settings called (gain = %d)\n",sc->sc_ogain));


        /* XXX: why?! this is called with interrupts disabled */
        mtx_enter(&audio_lock);

        gus_set_recrate(sc, sc->sc_irate);
        gus_set_volume(sc, GUS_VOICE_LEFT, sc->sc_ogain);
        gus_set_volume(sc, GUS_VOICE_RIGHT, sc->sc_ogain);
        gus_set_samprate(sc, GUS_VOICE_LEFT, sc->sc_orate);
        gus_set_samprate(sc, GUS_VOICE_RIGHT, sc->sc_orate);
        mtx_leave(&audio_lock);
        gus_set_chan_addrs(sc);

        return 0;
}

void
gus_set_chan_addrs(struct gus_softc *sc)
{
        /*
         * We use sc_nbufs * blocksize bytes of storage in the on-board GUS
         * ram.
         * For mono, each of the sc_nbufs buffers is DMA'd to in one chunk,
         * and both left & right channels play the same buffer.
         *
         * For stereo, each channel gets a contiguous half of the memory,
         * and each has sc_nbufs buffers of size blocksize/2.
         * Stereo data are deinterleaved in main memory before the DMA out
         * routines are called to queue the output.
         *
         * The blocksize per channel is kept in sc_chanblocksize.
         */
        if (sc->sc_channels == 2)
            sc->sc_chanblocksize = sc->sc_blocksize/2;
        else
            sc->sc_chanblocksize = sc->sc_blocksize;

        sc->sc_voc[GUS_VOICE_LEFT].start_addr = GUS_MEM_OFFSET - 1;
        sc->sc_voc[GUS_VOICE_RIGHT].start_addr =
            (gus_dostereo && sc->sc_channels == 2 ? GUS_LEFT_RIGHT_OFFSET : 0)
              + GUS_MEM_OFFSET - 1;
        sc->sc_voc[GUS_VOICE_RIGHT].current_addr =
            sc->sc_voc[GUS_VOICE_RIGHT].start_addr + 1;
        sc->sc_voc[GUS_VOICE_RIGHT].end_addr =
            sc->sc_voc[GUS_VOICE_RIGHT].start_addr +
            sc->sc_nbufs * sc->sc_chanblocksize;

}

/*
 * Set the sample rate of the given voice.  Called at splaudio().
 */

void
gus_set_samprate(struct gus_softc *sc, int voice, int freq)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        unsigned int fc;
        u_long temp, f = (u_long) freq;

        /*
         * calculate fc based on the number of active voices;
         * we need to use longs to preserve enough bits
         */

        temp = (u_long) gus_max_frequency[sc->sc_voices-GUS_MIN_VOICES];

        fc = (unsigned int)(((f << 9L) + (temp >> 1L)) / temp);

        fc <<= 1;


        /*
         * Program the voice frequency, and set it in the voice data record
         */

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) voice);
        SELECT_GUS_REG(iot, ioh2, GUSREG_FREQ_CONTROL);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, fc);

        sc->sc_voc[voice].rate = freq;

}

/*
 * Set the sample rate of the recording frequency.  Formula is from the GUS
 * SDK.  Called at splaudio().
 */

void
gus_set_recrate(struct gus_softc *sc, u_long rate)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        u_char realrate;
        DPRINTF(("gus_set_recrate %lu\n", rate));

#if 0
        realrate = 9878400/(16*(rate+2)); /* formula from GUS docs */
#endif
        realrate = (9878400 >> 4)/rate - 2; /* formula from code, sigh. */

        SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_FREQ);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, realrate);
}

/*
 * Turn the output on or off.  Note that some
 * of these bits are flipped in the register
 */

int
gus_speaker_ctl(void *addr, int newstate)
{
        struct gus_softc *sc = (struct gus_softc *) addr;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh1 = sc->sc_ioh1;

        /* Line out bit is flipped: 0 enables, 1 disables */
        if ((newstate == SPKR_ON) &&
            (sc->sc_mixcontrol & GUSMASK_LINE_OUT)) {
                sc->sc_mixcontrol &= ~GUSMASK_LINE_OUT;
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);
        }
        if ((newstate == SPKR_OFF) &&
            (sc->sc_mixcontrol & GUSMASK_LINE_OUT) == 0) {
                sc->sc_mixcontrol |= GUSMASK_LINE_OUT;
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);
        }

        return 0;
}

int
gus_linein_ctl(void *addr, int newstate)
{
        struct gus_softc *sc = (struct gus_softc *) addr;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh1 = sc->sc_ioh1;

        /* Line in bit is flipped: 0 enables, 1 disables */
        if ((newstate == SPKR_ON) &&
            (sc->sc_mixcontrol & GUSMASK_LINE_IN)) {
                sc->sc_mixcontrol &= ~GUSMASK_LINE_IN;
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);
        }
        if ((newstate == SPKR_OFF) &&
            (sc->sc_mixcontrol & GUSMASK_LINE_IN) == 0) {
                sc->sc_mixcontrol |= GUSMASK_LINE_IN;
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);
        }

        return 0;
}

int
gus_mic_ctl(void *addr, int newstate)
{
        struct gus_softc *sc = (struct gus_softc *) addr;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh1 = sc->sc_ioh1;

        /* Mic bit is normal: 1 enables, 0 disables */
        if ((newstate == SPKR_ON) &&
            (sc->sc_mixcontrol & GUSMASK_MIC_IN) == 0) {
                sc->sc_mixcontrol |= GUSMASK_MIC_IN;
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);
        }
        if ((newstate == SPKR_OFF) &&
            (sc->sc_mixcontrol & GUSMASK_MIC_IN)) {
                sc->sc_mixcontrol &= ~GUSMASK_MIC_IN;
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);
        }

        return 0;
}

/*
 * Set the end address of a give voice.  Called at splaudio().
 */

void
gus_set_endaddr(struct gus_softc *sc, int voice, u_long addr)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        sc->sc_voc[voice].end_addr = addr;

        if (sc->sc_voc[voice].voccntl & GUSMASK_DATA_SIZE16)
                addr = convert_to_16bit(addr);

        SELECT_GUS_REG(iot, ioh2, GUSREG_END_ADDR_HIGH);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_HIGH(addr));
        SELECT_GUS_REG(iot, ioh2, GUSREG_END_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(addr));

}

#ifdef GUSPLAYDEBUG
/*
 * Set current address.  Called at splaudio().
 */
void
gus_set_curaddr(struct gus_softc *sc, int voice, u_long addr)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        sc->sc_voc[voice].current_addr = addr;

        if (sc->sc_voc[voice].voccntl & GUSMASK_DATA_SIZE16)
                addr = convert_to_16bit(addr);

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) voice);

        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_HIGH);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_HIGH(addr));
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, ADDR_LOW(addr));

}

/*
 * Get current GUS playback address.  Called at splaudio().
 */
u_long
gus_get_curaddr(struct gus_softc *sc, int voice)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        u_long addr;

        bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) voice);
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_HIGH|GUSREG_READ);
        addr = (bus_space_read_2(iot, ioh2, GUS_DATA_LOW) & 0x1fff) << 7;
        SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_LOW|GUSREG_READ);
        addr |= (bus_space_read_2(iot, ioh2, GUS_DATA_LOW) >> 9L) & 0x7f;

        if (sc->sc_voc[voice].voccntl & GUSMASK_DATA_SIZE16)
            addr = (addr & 0xc0000) | ((addr & 0x1ffff) << 1); /* undo 16-bit change */
        DPRINTF(("gus voice %d curaddr %ld end_addr %ld\n",
                 voice, addr, sc->sc_voc[voice].end_addr));
        /* XXX sanity check the address? */

        return(addr);
}
#endif

/*
 * Convert an address value to a "16 bit" value - why this is necessary I
 * have NO idea
 */

u_long
convert_to_16bit(u_long address)
{
        u_long old_address;

        old_address = address;
        address >>= 1;
        address &= 0x0001ffffL;
        address |= (old_address & 0x000c0000L);

        return (address);
}

/*
 * Write a value into the GUS's DRAM
 */

void
guspoke(bus_space_tag_t iot, bus_space_handle_t ioh2, long address,
    unsigned char value)
{

        /*
         * Select the DRAM address
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DRAM_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, (unsigned int) (address & 0xffff));
        SELECT_GUS_REG(iot, ioh2, GUSREG_DRAM_ADDR_HIGH);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, (unsigned char) ((address >> 16) & 0xff));

        /*
         * Actually write the data
         */

        bus_space_write_1(iot, ioh2, GUS_DRAM_DATA, value);
}

/*
 * Read a value from the GUS's DRAM
 */

unsigned char
guspeek(bus_space_tag_t iot, bus_space_handle_t ioh2, u_long address)
{

        /*
         * Select the DRAM address
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DRAM_ADDR_LOW);
        bus_space_write_2(iot, ioh2, GUS_DATA_LOW, (unsigned int) (address & 0xffff));
        SELECT_GUS_REG(iot, ioh2, GUSREG_DRAM_ADDR_HIGH);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, (unsigned char) ((address >> 16) & 0xff));

        /*
         * Read in the data from the board
         */

        return (unsigned char) bus_space_read_1(iot, ioh2, GUS_DRAM_DATA);
}

/*
 * Reset the Gravis UltraSound card, completely
 */

void
gusreset(struct gus_softc *sc, int voices)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh1 = sc->sc_ioh1;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        bus_space_handle_t ioh4 = sc->sc_ioh4;
        int i;

        mtx_enter(&audio_lock);

        /*
         * Reset the GF1 chip
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_RESET);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);

        delay(500);

        /*
         * Release reset
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_RESET);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, GUSMASK_MASTER_RESET);

        delay(500);

        /*
         * Reset MIDI port as well, if applicable
         */

        if (ioh4 != (bus_space_handle_t)NULL) {
                bus_space_write_1(iot, ioh4, GUS_MIDI_CONTROL, MIDI_RESET);

                delay(500);

                bus_space_write_1(iot, ioh4, GUS_MIDI_CONTROL, 0x00);
        }

        /*
         * Clear interrupts
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);
        SELECT_GUS_REG(iot, ioh2, GUSREG_TIMER_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);
        SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);

        gus_set_voices(sc, voices);

        bus_space_read_1(iot, ioh1, GUS_IRQ_STATUS);
        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);
        SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_CONTROL);
        bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);
        SELECT_GUS_REG(iot, ioh2, GUSREG_IRQ_STATUS);
        bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);

        /*
         * Reset voice specific information
         */

        for(i = 0; i < voices; i++) {
                bus_space_write_1(iot, ioh2, GUS_VOICE_SELECT, (unsigned char) i);

                SELECT_GUS_REG(iot, ioh2, GUSREG_VOICE_CNTL);

                sc->sc_voc[i].voccntl = GUSMASK_VOICE_STOPPED |
                        GUSMASK_STOP_VOICE;

                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[i].voccntl);

                sc->sc_voc[i].volcntl = GUSMASK_VOLUME_STOPPED |
                                GUSMASK_STOP_VOLUME;

                SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_CONTROL);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, sc->sc_voc[i].volcntl);

                delay(100);

                gus_set_samprate(sc, i, 8000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_START_ADDR_HIGH);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_START_ADDR_LOW);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_END_ADDR_HIGH);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_END_ADDR_LOW);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_VOLUME_RATE);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x01);
                SELECT_GUS_REG(iot, ioh2, GUSREG_START_VOLUME);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x10);
                SELECT_GUS_REG(iot, ioh2, GUSREG_END_VOLUME);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0xe0);
                SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_VOLUME);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);

                SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_HIGH);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_CUR_ADDR_LOW);
                bus_space_write_2(iot, ioh2, GUS_DATA_LOW, 0x0000);
                SELECT_GUS_REG(iot, ioh2, GUSREG_PAN_POS);
                bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x07);
        }

        /*
         * Clear out any pending IRQs
         */

        bus_space_read_1(iot, ioh1, GUS_IRQ_STATUS);
        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);
        SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_CONTROL);
        bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);
        SELECT_GUS_REG(iot, ioh2, GUSREG_IRQ_STATUS);
        bus_space_read_1(iot, ioh2, GUS_DATA_HIGH);

        SELECT_GUS_REG(iot, ioh2, GUSREG_RESET);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, GUSMASK_MASTER_RESET | GUSMASK_DAC_ENABLE |
                GUSMASK_IRQ_ENABLE);

        mtx_leave(&audio_lock);
}


int
gus_init_cs4231(struct gus_softc *sc)
{
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh1 = sc->sc_ioh1;
        int port = sc->sc_iobase;
        u_char ctrl;

        ctrl = (port & 0xf0) >> 4;      /* set port address middle nibble */
        /*
         * The codec is a bit weird--swapped dma channels.
         */
        ctrl |= GUS_MAX_CODEC_ENABLE;
        if (sc->sc_drq >= 4)
                ctrl |= GUS_MAX_RECCHAN16;
        if (sc->sc_recdrq >= 4)
                ctrl |= GUS_MAX_PLAYCHAN16;

        bus_space_write_1(iot, ioh1, GUS_MAX_CTRL, ctrl);

        sc->sc_codec.sc_iot = sc->sc_iot;
        sc->sc_codec.sc_iobase = port+GUS_MAX_CODEC_BASE;

        if (ad1848_mapprobe(&sc->sc_codec, sc->sc_codec.sc_iobase) == 0) {
                sc->sc_flags &= ~GUS_CODEC_INSTALLED;
                return (0);
        } else {
                struct ad1848_volume vol = {AUDIO_MAX_GAIN, AUDIO_MAX_GAIN};
                sc->sc_flags |= GUS_CODEC_INSTALLED;
                sc->sc_codec.parent = sc;
                sc->sc_codec.sc_drq = sc->sc_recdrq;
                sc->sc_codec.sc_recdrq = sc->sc_drq;
                /* enable line in and mic in the GUS mixer; the codec chip
                   will do the real mixing for them. */
                sc->sc_mixcontrol &= ~GUSMASK_LINE_IN; /* 0 enables. */
                sc->sc_mixcontrol |= GUSMASK_MIC_IN; /* 1 enables. */
                bus_space_write_1(iot, ioh1, GUS_MIX_CONTROL, sc->sc_mixcontrol);

                ad1848_attach(&sc->sc_codec);
                /* turn on pre-MUX microphone gain. */
                ad1848_set_mic_gain(&sc->sc_codec, &vol);

                return (1);
        }
}

/*
 * stubs (XXX)
 */

int
gus_set_in_gain(caddr_t addr, u_int gain,  u_char balance)
{
        DPRINTF(("gus_set_in_gain called\n"));
        return 0;
}

int
gus_get_in_gain(caddr_t addr)
{
        DPRINTF(("gus_get_in_gain called\n"));
        return 0;
}

int
gusmax_dma_input(void *addr, void *buf, int size, void (*callback)(void *),
    void *arg)
{
        struct ad1848_softc *sc = addr;
        return gus_dma_input(sc->parent, buf, size, callback, arg);
}

/*
 * Start sampling the input source into the requested DMA buffer.
 * Called at splaudio(), either from top-half or from interrupt handler.
 */
int
gus_dma_input(void *addr, void *buf, int size, void (*callback)(void *),
    void *arg)
{
        struct gus_softc *sc = addr;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;
        u_char dmac;
        DMAPRINTF(("gus_dma_input called\n"));

        /*
         * Sample SIZE bytes of data from the card, into buffer at BUF.
         */
        if (sc->sc_precision == 16) {
            return EINVAL;              /* XXX */
        }

        /* set DMA modes */
        dmac = GUSMASK_SAMPLE_IRQ|GUSMASK_SAMPLE_START;
        if (sc->sc_recdrq >= 4)
                dmac |= GUSMASK_SAMPLE_DATA16;
        if (sc->sc_encoding == AUDIO_ENCODING_ULAW ||
            sc->sc_encoding == AUDIO_ENCODING_ALAW ||
            sc->sc_encoding == AUDIO_ENCODING_ULINEAR_LE ||
            sc->sc_encoding == AUDIO_ENCODING_ULINEAR_BE)
            dmac |= GUSMASK_SAMPLE_INVBIT;
        if (sc->sc_channels == 2)
            dmac |= GUSMASK_SAMPLE_STEREO;
        isa_dmastart(sc->sc_dev.dv_parent, sc->sc_recdrq, buf, size,
            NULL, DMAMODE_READ, BUS_DMA_NOWAIT);

        DMAPRINTF(("gus_dma_input isadma_started\n"));
        sc->sc_flags |= GUS_DMAIN_ACTIVE;
        sc->sc_dmainintr = callback;
        sc->sc_inarg = arg;
        sc->sc_dmaincnt = size;
        sc->sc_dmainaddr = buf;

        SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, dmac);      /* Go! */


        DMAPRINTF(("gus_dma_input returning\n"));
        return 0;
}

int
gus_dmain_intr(struct gus_softc *sc)
{
        void (*callback)(void *);
        void *arg;

        DMAPRINTF(("gus_dmain_intr called\n"));
        if (sc->sc_dmainintr) {
            isa_dmadone(sc->sc_dev.dv_parent, sc->sc_recdrq);
            callback = sc->sc_dmainintr;
            arg = sc->sc_inarg;

            sc->sc_dmainaddr = 0;
            sc->sc_dmaincnt = 0;
            sc->sc_dmainintr = 0;
            sc->sc_inarg = 0;

            sc->sc_flags &= ~GUS_DMAIN_ACTIVE;
            DMAPRINTF(("calling dmain_intr callback %p(%p)\n", callback, arg));
            (*callback)(arg);
            return 1;
        } else {
            DMAPRINTF(("gus_dmain_intr false?\n"));
            return 0;                   /* XXX ??? */
        }
}

int
gusmax_halt_out_dma(void *addr)
{
        struct ad1848_softc *sc = addr;
        return gus_halt_out_dma(sc->parent);
}


int
gusmax_halt_in_dma(void *addr)
{
        struct ad1848_softc *sc = addr;
        return gus_halt_in_dma(sc->parent);
}

/*
 * Stop any DMA output.  Called at splaudio().
 */
int
gus_halt_out_dma(void *addr)
{
        struct gus_softc *sc = addr;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        mtx_enter(&audio_lock);
        DMAPRINTF(("gus_halt_out_dma called\n"));
        /*
         * Make sure the GUS _isn't_ setup for DMA
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_DMA_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0);

        timeout_del(&sc->sc_dma_tmo);
        isa_dmaabort(sc->sc_dev.dv_parent, sc->sc_drq);
        sc->sc_flags &= ~(GUS_DMAOUT_ACTIVE|GUS_LOCKED);
        sc->sc_dmaoutintr = 0;
        sc->sc_outarg = 0;
        sc->sc_dmaoutaddr = 0;
        sc->sc_dmaoutcnt = 0;
        sc->sc_dmabuf = 0;
        sc->sc_bufcnt = 0;
        sc->sc_playbuf = -1;
        /* also stop playing */
        gus_stop_voice(sc, GUS_VOICE_LEFT, 1);
        gus_stop_voice(sc, GUS_VOICE_RIGHT, 0);
        mtx_leave(&audio_lock);
        return 0;
}

/*
 * Stop any DMA output.  Called at splaudio().
 */
int
gus_halt_in_dma(void *addr)
{
        struct gus_softc *sc = addr;
        bus_space_tag_t iot = sc->sc_iot;
        bus_space_handle_t ioh2 = sc->sc_ioh2;

        mtx_enter(&audio_lock);
        DMAPRINTF(("gus_halt_in_dma called\n"));

        /*
         * Make sure the GUS _isn't_ setup for DMA
         */

        SELECT_GUS_REG(iot, ioh2, GUSREG_SAMPLE_CONTROL);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH,
             bus_space_read_1(iot, ioh2, GUS_DATA_HIGH) & ~(GUSMASK_SAMPLE_START|GUSMASK_SAMPLE_IRQ));

        isa_dmaabort(sc->sc_dev.dv_parent, sc->sc_recdrq);
        sc->sc_flags &= ~GUS_DMAIN_ACTIVE;
        sc->sc_dmainintr = 0;
        sc->sc_inarg = 0;
        sc->sc_dmainaddr = 0;
        sc->sc_dmaincnt = 0;
        mtx_leave(&audio_lock);
        return 0;
}


ad1848_devmap_t gusmapping[] = {
  {GUSMAX_DAC_LVL, AD1848_KIND_LVL, AD1848_AUX1_CHANNEL},
  {GUSMAX_LINE_IN_LVL, AD1848_KIND_LVL, AD1848_LINE_CHANNEL},
  {GUSMAX_MONO_LVL, AD1848_KIND_LVL, AD1848_MONO_CHANNEL},
  {GUSMAX_CD_LVL, AD1848_KIND_LVL, AD1848_AUX2_CHANNEL},
  {GUSMAX_MONITOR_LVL, AD1848_KIND_LVL, AD1848_MONITOR_CHANNEL},
  {GUSMAX_OUT_LVL, AD1848_KIND_LVL, AD1848_DAC_CHANNEL},
  {GUSMAX_DAC_MUTE, AD1848_KIND_MUTE, AD1848_AUX1_CHANNEL},
  {GUSMAX_LINE_IN_MUTE, AD1848_KIND_MUTE, AD1848_LINE_CHANNEL},
  {GUSMAX_MONO_MUTE, AD1848_KIND_MUTE, AD1848_MONO_CHANNEL},
  {GUSMAX_CD_MUTE, AD1848_KIND_MUTE, AD1848_AUX2_CHANNEL},
  {GUSMAX_MONITOR_MUTE, AD1848_KIND_MUTE, AD1848_MONITOR_CHANNEL},
  {GUSMAX_REC_LVL, AD1848_KIND_RECORDGAIN, -1},
  {GUSMAX_RECORD_SOURCE, AD1848_KIND_RECORDSOURCE, -1}
};

int nummap = sizeof(gusmapping) / sizeof(gusmapping[0]);

int
gusmax_mixer_get_port(void *addr, mixer_ctrl_t *cp)
{
        struct ad1848_softc *ac = addr;
        struct gus_softc *sc = ac->parent;
        struct ad1848_volume vol;
        int error = ad1848_mixer_get_port(ac, gusmapping, nummap, cp);

        if (error != ENXIO)
          return (error);

        error = EINVAL;

        switch (cp->dev) {
        case GUSMAX_SPEAKER_LVL:        /* fake speaker for mute naming */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        if (sc->sc_mixcontrol & GUSMASK_LINE_OUT)
                                vol.left = vol.right = AUDIO_MAX_GAIN;
                        else
                                vol.left = vol.right = AUDIO_MIN_GAIN;
                        error = 0;
                        ad1848_from_vol(cp, &vol);
                }
                break;

        case GUSMAX_SPEAKER_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        cp->un.ord = sc->sc_mixcontrol & GUSMASK_LINE_OUT ? 1 : 0;
                        error = 0;
                }
                break;
        default:
                error = ENXIO;
                break;
        }

        return(error);
}

int
gus_mixer_get_port(void *addr, mixer_ctrl_t *cp)
{
        struct gus_softc *sc = addr;
        struct ics2101_softc *ic = &sc->sc_mixer;
        struct ad1848_volume vol;
        int error = EINVAL;

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

        if (!HAS_MIXER(sc) && cp->dev > GUSICS_MASTER_MUTE)
                return ENXIO;

        switch (cp->dev) {

        case GUSICS_MIC_IN_MUTE:        /* Microphone */
                if (cp->type == AUDIO_MIXER_ENUM) {
                        if (HAS_MIXER(sc))
                                cp->un.ord = ic->sc_mute[GUSMIX_CHAN_MIC][ICSMIX_LEFT];
                        else
                                cp->un.ord =
                                    sc->sc_mixcontrol & GUSMASK_MIC_IN ? 0 : 1;
                        error = 0;
                }
                break;

        case GUSICS_LINE_IN_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        if (HAS_MIXER(sc))
                                cp->un.ord = ic->sc_mute[GUSMIX_CHAN_LINE][ICSMIX_LEFT];
                        else
                                cp->un.ord =
                                    sc->sc_mixcontrol & GUSMASK_LINE_IN ? 1 : 0;
                        error = 0;
                }
                break;

        case GUSICS_MASTER_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        if (HAS_MIXER(sc))
                                cp->un.ord = ic->sc_mute[GUSMIX_CHAN_MASTER][ICSMIX_LEFT];
                        else
                                cp->un.ord =
                                    sc->sc_mixcontrol & GUSMASK_LINE_OUT ? 1 : 0;
                        error = 0;
                }
                break;

        case GUSICS_DAC_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        cp->un.ord = ic->sc_mute[GUSMIX_CHAN_DAC][ICSMIX_LEFT];
                        error = 0;
                }
                break;

        case GUSICS_CD_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        cp->un.ord = ic->sc_mute[GUSMIX_CHAN_CD][ICSMIX_LEFT];
                        error = 0;
                }
                break;

        case GUSICS_MASTER_LVL:
                if (cp->type == AUDIO_MIXER_VALUE) {
                        vol.left = ic->sc_setting[GUSMIX_CHAN_MASTER][ICSMIX_LEFT];
                        vol.right = ic->sc_setting[GUSMIX_CHAN_MASTER][ICSMIX_RIGHT];
                        if (ad1848_from_vol(cp, &vol))
                                error = 0;
                }
                break;

        case GUSICS_MIC_IN_LVL: /* Microphone */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        vol.left = ic->sc_setting[GUSMIX_CHAN_MIC][ICSMIX_LEFT];
                        vol.right = ic->sc_setting[GUSMIX_CHAN_MIC][ICSMIX_RIGHT];
                        if (ad1848_from_vol(cp, &vol))
                                error = 0;
                }
                break;

        case GUSICS_LINE_IN_LVL:        /* line in */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        vol.left = ic->sc_setting[GUSMIX_CHAN_LINE][ICSMIX_LEFT];
                        vol.right = ic->sc_setting[GUSMIX_CHAN_LINE][ICSMIX_RIGHT];
                        if (ad1848_from_vol(cp, &vol))
                                error = 0;
                }
                break;


        case GUSICS_CD_LVL:
                if (cp->type == AUDIO_MIXER_VALUE) {
                        vol.left = ic->sc_setting[GUSMIX_CHAN_CD][ICSMIX_LEFT];
                        vol.right = ic->sc_setting[GUSMIX_CHAN_CD][ICSMIX_RIGHT];
                        if (ad1848_from_vol(cp, &vol))
                                error = 0;
                }
                break;

        case GUSICS_DAC_LVL:            /* dac out */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        vol.left = ic->sc_setting[GUSMIX_CHAN_DAC][ICSMIX_LEFT];
                        vol.right = ic->sc_setting[GUSMIX_CHAN_DAC][ICSMIX_RIGHT];
                        if (ad1848_from_vol(cp, &vol))
                                error = 0;
                }
                break;


        case GUSICS_RECORD_SOURCE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        /* Can't set anything else useful, sigh. */
                         cp->un.ord = 0;
                }
                break;

        default:
                return ENXIO;
            /*NOTREACHED*/
        }
        return error;
}

void
gusics_master_mute(struct ics2101_softc *ic, int mute)
{
        ics2101_mix_mute(ic, GUSMIX_CHAN_MASTER, ICSMIX_LEFT, mute);
        ics2101_mix_mute(ic, GUSMIX_CHAN_MASTER, ICSMIX_RIGHT, mute);
}

void
gusics_mic_mute(struct ics2101_softc *ic, int mute)
{
        ics2101_mix_mute(ic, GUSMIX_CHAN_MIC, ICSMIX_LEFT, mute);
        ics2101_mix_mute(ic, GUSMIX_CHAN_MIC, ICSMIX_RIGHT, mute);
}

void
gusics_linein_mute(struct ics2101_softc *ic, int mute)
{
        ics2101_mix_mute(ic, GUSMIX_CHAN_LINE, ICSMIX_LEFT, mute);
        ics2101_mix_mute(ic, GUSMIX_CHAN_LINE, ICSMIX_RIGHT, mute);
}

void
gusics_cd_mute(struct ics2101_softc *ic, int mute)
{
        ics2101_mix_mute(ic, GUSMIX_CHAN_CD, ICSMIX_LEFT, mute);
        ics2101_mix_mute(ic, GUSMIX_CHAN_CD, ICSMIX_RIGHT, mute);
}

void
gusics_dac_mute(struct ics2101_softc *ic, int mute)
{
        ics2101_mix_mute(ic, GUSMIX_CHAN_DAC, ICSMIX_LEFT, mute);
        ics2101_mix_mute(ic, GUSMIX_CHAN_DAC, ICSMIX_RIGHT, mute);
}

int
gusmax_mixer_set_port(void *addr, mixer_ctrl_t *cp)
{
        struct ad1848_softc *ac = addr;
        struct gus_softc *sc = ac->parent;
        struct ad1848_volume vol;
        int error = ad1848_mixer_set_port(ac, gusmapping, nummap, cp);

        if (error != ENXIO)
          return (error);

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

        switch (cp->dev) {
        case GUSMAX_SPEAKER_LVL:
                if (cp->type == AUDIO_MIXER_VALUE &&
                    cp->un.value.num_channels == 1) {
                        if (ad1848_to_vol(cp, &vol)) {
                                gus_speaker_ctl(sc, vol.left > AUDIO_MIN_GAIN ?
                                                SPKR_ON : SPKR_OFF);
                                error = 0;
                        }
                }
                break;

        case GUSMAX_SPEAKER_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        gus_speaker_ctl(sc, cp->un.ord ? SPKR_OFF : SPKR_ON);
                        error = 0;
                }
                break;

        default:
                return ENXIO;
            /*NOTREACHED*/
    }
    return error;
}

int
gus_mixer_set_port(void *addr, mixer_ctrl_t *cp)
{
        struct gus_softc *sc = addr;
        struct ics2101_softc *ic = &sc->sc_mixer;
        struct ad1848_volume vol;
        int error = EINVAL;

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

        if (!HAS_MIXER(sc) && cp->dev > GUSICS_MASTER_MUTE)
                return ENXIO;

        switch (cp->dev) {

        case GUSICS_MIC_IN_MUTE:        /* Microphone */
                if (cp->type == AUDIO_MIXER_ENUM) {
                        DPRINTF(("mic mute %d\n", cp->un.ord));
                        if (HAS_MIXER(sc)) {
                                gusics_mic_mute(ic, cp->un.ord);
                        }
                        gus_mic_ctl(sc, cp->un.ord ? SPKR_OFF : SPKR_ON);
                        error = 0;
                }
                break;

        case GUSICS_LINE_IN_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        DPRINTF(("linein mute %d\n", cp->un.ord));
                        if (HAS_MIXER(sc)) {
                                gusics_linein_mute(ic, cp->un.ord);
                        }
                        gus_linein_ctl(sc, cp->un.ord ? SPKR_OFF : SPKR_ON);
                        error = 0;
                }
                break;

        case GUSICS_MASTER_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        DPRINTF(("master mute %d\n", cp->un.ord));
                        if (HAS_MIXER(sc)) {
                                gusics_master_mute(ic, cp->un.ord);
                        }
                        gus_speaker_ctl(sc, cp->un.ord ? SPKR_OFF : SPKR_ON);
                        error = 0;
                }
                break;

        case GUSICS_DAC_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        gusics_dac_mute(ic, cp->un.ord);
                        error = 0;
                }
                break;

        case GUSICS_CD_MUTE:
                if (cp->type == AUDIO_MIXER_ENUM) {
                        gusics_cd_mute(ic, cp->un.ord);
                        error = 0;
                }
                break;

        case GUSICS_MASTER_LVL:
                if (cp->type == AUDIO_MIXER_VALUE) {
                        if (ad1848_to_vol(cp, &vol)) {
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_MASTER,
                                                      ICSMIX_LEFT,
                                                      vol.left);
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_MASTER,
                                                      ICSMIX_RIGHT,
                                                      vol.right);
                                error = 0;
                        }
                }
                break;

        case GUSICS_MIC_IN_LVL: /* Microphone */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        if (ad1848_to_vol(cp, &vol)) {
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_MIC,
                                                      ICSMIX_LEFT,
                                                      vol.left);
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_MIC,
                                                      ICSMIX_RIGHT,
                                                      vol.right);
                                error = 0;
                        }
                }
                break;

        case GUSICS_LINE_IN_LVL:        /* line in */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        if (ad1848_to_vol(cp, &vol)) {
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_LINE,
                                                      ICSMIX_LEFT,
                                                      vol.left);
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_LINE,
                                                      ICSMIX_RIGHT,
                                                      vol.right);
                                error = 0;
                        }
                }
                break;


        case GUSICS_CD_LVL:
                if (cp->type == AUDIO_MIXER_VALUE) {
                        if (ad1848_to_vol(cp, &vol)) {
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_CD,
                                                      ICSMIX_LEFT,
                                                      vol.left);
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_CD,
                                                      ICSMIX_RIGHT,
                                                      vol.right);
                                error = 0;
                        }
                }
                break;

        case GUSICS_DAC_LVL:            /* dac out */
                if (cp->type == AUDIO_MIXER_VALUE) {
                        if (ad1848_to_vol(cp, &vol)) {
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_DAC,
                                                      ICSMIX_LEFT,
                                                      vol.left);
                                ics2101_mix_attenuate(ic,
                                                      GUSMIX_CHAN_DAC,
                                                      ICSMIX_RIGHT,
                                                      vol.right);
                                error = 0;
                        }
                }
                break;


        case GUSICS_RECORD_SOURCE:
                if (cp->type == AUDIO_MIXER_ENUM && cp->un.ord == 0) {
                        /* Can't set anything else useful, sigh. */
                        error = 0;
                }
                break;

        default:
                return ENXIO;
            /*NOTREACHED*/
        }
        return error;
}

int
gusmax_mixer_query_devinfo(void *addr, mixer_devinfo_t *dip)
{
        DPRINTF(("gusmax_query_devinfo: index=%d\n", dip->index));

        switch(dip->index) {
#if 0
    case GUSMAX_MIC_IN_LVL:     /* Microphone */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_MIC_IN_MUTE;
        strlcpy(dip->label.name, AudioNmicrophone, sizeof dip->label.name);
        dip->un.v.num_channels = 2;
        strlcpy(dip->un.v.units.name, AudioNvolume,
            sizeof dip->un.v.units.name);
        break;
#endif

    case GUSMAX_MONO_LVL:       /* mono/microphone mixer */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_MONO_MUTE;
        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);
        break;

    case GUSMAX_DAC_LVL:                /*  dacout */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_DAC_MUTE;
        strlcpy(dip->label.name, AudioNdac, sizeof dip->label.name);
        dip->un.v.num_channels = 2;
        strlcpy(dip->un.v.units.name, AudioNvolume,
            sizeof dip->un.v.units.name);
        break;

    case GUSMAX_LINE_IN_LVL:    /* line */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_LINE_IN_MUTE;
        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);
        break;

    case GUSMAX_CD_LVL:         /* cd */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_CD_MUTE;
        strlcpy(dip->label.name, AudioNcd, sizeof dip->label.name);
        dip->un.v.num_channels = 2;
        strlcpy(dip->un.v.units.name, AudioNvolume,
            sizeof dip->un.v.units.name);
        break;


    case GUSMAX_MONITOR_LVL:    /* monitor level */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_MONITOR_CLASS;
        dip->next = GUSMAX_MONITOR_MUTE;
        dip->prev = AUDIO_MIXER_LAST;
        strlcpy(dip->label.name, AudioNmonitor, sizeof dip->label.name);
        dip->un.v.num_channels = 1;
        strlcpy(dip->un.v.units.name, AudioNvolume,
            sizeof dip->un.v.units.name);
        break;

    case GUSMAX_OUT_LVL:                /* cs4231 output volume: not useful? */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_MONITOR_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);
        break;

    case GUSMAX_SPEAKER_LVL:            /* fake speaker volume */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_MONITOR_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_SPEAKER_MUTE;
        strlcpy(dip->label.name, AudioNmaster, sizeof dip->label.name);
        dip->un.v.num_channels = 2;
        strlcpy(dip->un.v.units.name, AudioNvolume,
            sizeof dip->un.v.units.name);
        break;

    case GUSMAX_LINE_IN_MUTE:
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_LINE_IN_LVL;
        dip->next = AUDIO_MIXER_LAST;
        goto mute;

    case GUSMAX_DAC_MUTE:
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_DAC_LVL;
        dip->next = AUDIO_MIXER_LAST;
        goto mute;

    case GUSMAX_CD_MUTE:
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_CD_LVL;
        dip->next = AUDIO_MIXER_LAST;
        goto mute;

    case GUSMAX_MONO_MUTE:
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_MONO_LVL;
        dip->next = AUDIO_MIXER_LAST;
        goto mute;

    case GUSMAX_MONITOR_MUTE:
        dip->mixer_class = GUSMAX_OUTPUT_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_MONITOR_LVL;
        dip->next = AUDIO_MIXER_LAST;
        goto mute;

    case GUSMAX_SPEAKER_MUTE:
        dip->mixer_class = GUSMAX_OUTPUT_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_SPEAKER_LVL;
        dip->next = AUDIO_MIXER_LAST;
    mute:
        strlcpy(dip->label.name, AudioNmute, 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;
        break;

    case GUSMAX_REC_LVL:        /* record level */
        dip->type = AUDIO_MIXER_VALUE;
        dip->mixer_class = GUSMAX_RECORD_CLASS;
        dip->prev = AUDIO_MIXER_LAST;
        dip->next = GUSMAX_RECORD_SOURCE;
        strlcpy(dip->label.name, AudioNrecord, sizeof dip->label.name);
        dip->un.v.num_channels = 2;
        strlcpy(dip->un.v.units.name, AudioNvolume, sizeof dip->un.v.units.name);
        break;

    case GUSMAX_RECORD_SOURCE:
        dip->mixer_class = GUSMAX_RECORD_CLASS;
        dip->type = AUDIO_MIXER_ENUM;
        dip->prev = GUSMAX_REC_LVL;
        dip->next = AUDIO_MIXER_LAST;
        strlcpy(dip->label.name, AudioNsource, sizeof dip->label.name);
        dip->un.e.num_mem = 4;
        strlcpy(dip->un.e.member[0].label.name, AudioNoutput,
            sizeof dip->un.e.member[0].label.name);
        dip->un.e.member[0].ord = DAC_IN_PORT;
        strlcpy(dip->un.e.member[1].label.name, AudioNmicrophone,
            sizeof dip->un.e.member[1].label.name);
        dip->un.e.member[1].ord = MIC_IN_PORT;
        strlcpy(dip->un.e.member[2].label.name, AudioNdac,
            sizeof dip->un.e.member[2].label.name);
        dip->un.e.member[2].ord = AUX1_IN_PORT;
        strlcpy(dip->un.e.member[3].label.name, AudioNline,
            sizeof dip->un.e.member[3].label.name);
        dip->un.e.member[3].ord = LINE_IN_PORT;
        break;

    case GUSMAX_INPUT_CLASS:                    /* input class descriptor */
        dip->type = AUDIO_MIXER_CLASS;
        dip->mixer_class = GUSMAX_INPUT_CLASS;
        dip->next = dip->prev = AUDIO_MIXER_LAST;
        strlcpy(dip->label.name, AudioCinputs, sizeof dip->label.name);
        break;

    case GUSMAX_OUTPUT_CLASS:                   /* output class descriptor */
        dip->type = AUDIO_MIXER_CLASS;
        dip->mixer_class = GUSMAX_OUTPUT_CLASS;
        dip->next = dip->prev = AUDIO_MIXER_LAST;
        strlcpy(dip->label.name, AudioCoutputs, sizeof dip->label.name);
        break;

    case GUSMAX_MONITOR_CLASS:                  /* monitor class descriptor */
        dip->type = AUDIO_MIXER_CLASS;
        dip->mixer_class = GUSMAX_MONITOR_CLASS;
        dip->next = dip->prev = AUDIO_MIXER_LAST;
        strlcpy(dip->label.name, AudioCmonitor, sizeof dip->label.name);
        break;

    case GUSMAX_RECORD_CLASS:                   /* record source class */
        dip->type = AUDIO_MIXER_CLASS;
        dip->mixer_class = GUSMAX_RECORD_CLASS;
        dip->next = dip->prev = AUDIO_MIXER_LAST;
        strlcpy(dip->label.name, AudioCrecord, sizeof dip->label.name);
        break;

    default:
        return ENXIO;
        /*NOTREACHED*/
    }
    DPRINTF(("AUDIO_MIXER_DEVINFO: name=%s\n", dip->label.name));
        return 0;
}

int
gus_mixer_query_devinfo(void *addr, mixer_devinfo_t *dip)
{
        struct gus_softc *sc = addr;

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

        if (!HAS_MIXER(sc) && dip->index > GUSICS_MASTER_MUTE)
                return ENXIO;

        switch(dip->index) {

        case GUSICS_MIC_IN_LVL: /* Microphone */
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = GUSICS_MIC_IN_MUTE;
                strlcpy(dip->label.name, AudioNmicrophone,
                    sizeof dip->label.name);
                dip->un.v.num_channels = 2;
                strlcpy(dip->un.v.units.name, AudioNvolume,
                    sizeof dip->un.v.units.name);
                break;

        case GUSICS_LINE_IN_LVL:        /* line */
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = GUSICS_LINE_IN_MUTE;
                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);
                break;

        case GUSICS_CD_LVL:             /* cd */
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = GUSICS_CD_MUTE;
                strlcpy(dip->label.name, AudioNcd, sizeof dip->label.name);
                dip->un.v.num_channels = 2;
                strlcpy(dip->un.v.units.name, AudioNvolume,
                    sizeof dip->un.v.units.name);
                break;

        case GUSICS_DAC_LVL:            /*  dacout */
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = GUSICS_DAC_MUTE;
                strlcpy(dip->label.name, AudioNdac, sizeof dip->label.name);
                dip->un.v.num_channels = 2;
                strlcpy(dip->un.v.units.name, AudioNvolume,
                    sizeof dip->un.v.units.name);
                break;

        case GUSICS_MASTER_LVL:         /*  master output */
                dip->type = AUDIO_MIXER_VALUE;
                dip->mixer_class = GUSICS_OUTPUT_CLASS;
                dip->prev = AUDIO_MIXER_LAST;
                dip->next = GUSICS_MASTER_MUTE;
                strlcpy(dip->label.name, AudioNmaster, sizeof dip->label.name);
                dip->un.v.num_channels = 2;
                strlcpy(dip->un.v.units.name, AudioNvolume,
                    sizeof dip->un.v.units.name);
                break;


        case GUSICS_LINE_IN_MUTE:
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->type = AUDIO_MIXER_ENUM;
                dip->prev = GUSICS_LINE_IN_LVL;
                dip->next = AUDIO_MIXER_LAST;
                goto mute;

        case GUSICS_DAC_MUTE:
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->type = AUDIO_MIXER_ENUM;
                dip->prev = GUSICS_DAC_LVL;
                dip->next = AUDIO_MIXER_LAST;
                goto mute;

        case GUSICS_CD_MUTE:
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->type = AUDIO_MIXER_ENUM;
                dip->prev = GUSICS_CD_LVL;
                dip->next = AUDIO_MIXER_LAST;
                goto mute;

        case GUSICS_MIC_IN_MUTE:
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->type = AUDIO_MIXER_ENUM;
                dip->prev = GUSICS_MIC_IN_LVL;
                dip->next = AUDIO_MIXER_LAST;
                goto mute;

        case GUSICS_MASTER_MUTE:
                dip->mixer_class = GUSICS_OUTPUT_CLASS;
                dip->type = AUDIO_MIXER_ENUM;
                dip->prev = GUSICS_MASTER_LVL;
                dip->next = AUDIO_MIXER_LAST;
mute:
                strlcpy(dip->label.name, AudioNmute, 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;
                break;

        case GUSICS_RECORD_SOURCE:
                dip->mixer_class = GUSICS_RECORD_CLASS;
                dip->type = AUDIO_MIXER_ENUM;
                dip->prev = dip->next = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioNsource, sizeof dip->label.name);
                dip->un.e.num_mem = 1;
                strlcpy(dip->un.e.member[0].label.name, AudioNoutput,
                    sizeof dip->un.e.member[0].label.name);
                dip->un.e.member[0].ord = GUSICS_MASTER_LVL;
                break;

        case GUSICS_INPUT_CLASS:
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = GUSICS_INPUT_CLASS;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioCinputs, sizeof dip->label.name);
                break;

        case GUSICS_OUTPUT_CLASS:
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = GUSICS_OUTPUT_CLASS;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioCoutputs, sizeof dip->label.name);
                break;

        case GUSICS_RECORD_CLASS:
                dip->type = AUDIO_MIXER_CLASS;
                dip->mixer_class = GUSICS_RECORD_CLASS;
                dip->next = dip->prev = AUDIO_MIXER_LAST;
                strlcpy(dip->label.name, AudioCrecord, sizeof dip->label.name);
                break;

        default:
                return ENXIO;
        /*NOTREACHED*/
        }
        DPRINTF(("AUDIO_MIXER_DEVINFO: name=%s\n", dip->label.name));
        return 0;
}

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

        if (direction == AUMODE_PLAY)
                drq = sc->sc_drq;
        else
                drq = sc->sc_recdrq;

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

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

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

/*
 * Setup the ICS mixer in "transparent" mode: reset everything to a sensible
 * level.  Levels as suggested by GUS SDK code.
 */

void
gus_init_ics2101(struct gus_softc *sc)
{
        struct ics2101_softc *ic = &sc->sc_mixer;
        sc->sc_mixer.sc_iot = sc->sc_iot;
        sc->sc_mixer.sc_selio = GUS_MIXER_SELECT;
        sc->sc_mixer.sc_selio_ioh = sc->sc_ioh3;
        sc->sc_mixer.sc_dataio = GUS_MIXER_DATA;
        sc->sc_mixer.sc_dataio_ioh = sc->sc_ioh2;
        sc->sc_mixer.sc_flags = (sc->sc_revision == 5) ? ICS_FLIP : 0;

        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_MIC,
                              ICSMIX_LEFT,
                              ICSMIX_MIN_ATTN);
        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_MIC,
                              ICSMIX_RIGHT,
                              ICSMIX_MIN_ATTN);
        /*
         * Start with microphone muted by the mixer...
         */
        gusics_mic_mute(ic, 1);

        /* ... and enabled by the GUS master mix control */
        gus_mic_ctl(sc, SPKR_ON);

        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_LINE,
                              ICSMIX_LEFT,
                              ICSMIX_MIN_ATTN);
        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_LINE,
                              ICSMIX_RIGHT,
                              ICSMIX_MIN_ATTN);

        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_CD,
                              ICSMIX_LEFT,
                              ICSMIX_MIN_ATTN);
        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_CD,
                              ICSMIX_RIGHT,
                              ICSMIX_MIN_ATTN);

        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_DAC,
                              ICSMIX_LEFT,
                              ICSMIX_MIN_ATTN);
        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_DAC,
                              ICSMIX_RIGHT,
                              ICSMIX_MIN_ATTN);

        ics2101_mix_attenuate(ic,
                              ICSMIX_CHAN_4,
                              ICSMIX_LEFT,
                              ICSMIX_MAX_ATTN);
        ics2101_mix_attenuate(ic,
                              ICSMIX_CHAN_4,
                              ICSMIX_RIGHT,
                              ICSMIX_MAX_ATTN);

        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_MASTER,
                              ICSMIX_LEFT,
                              ICSMIX_MIN_ATTN);
        ics2101_mix_attenuate(ic,
                              GUSMIX_CHAN_MASTER,
                              ICSMIX_RIGHT,
                              ICSMIX_MIN_ATTN);
        /* unmute other stuff: */
        gusics_cd_mute(ic, 0);
        gusics_dac_mute(ic, 0);
        gusics_linein_mute(ic, 0);
        return;
}



void
gus_subattach(struct gus_softc *sc, struct isa_attach_args *ia)
{
        int             i;
        bus_space_tag_t iot;
        unsigned char   c,d,m;
        u_long          s;

        iot = sc->sc_iot;

        /*
         * Figure out our board rev, and see if we need to initialize the
         * mixer
         */

        c = bus_space_read_1(iot, sc->sc_ioh3, GUS_BOARD_REV);
        if (c != 0xff)
                sc->sc_revision = c;
        else
                sc->sc_revision = 0;

        SELECT_GUS_REG(iot, sc->sc_ioh2, GUSREG_RESET);
        bus_space_write_1(iot, sc->sc_ioh2, GUS_DATA_HIGH, 0x00);

        gusreset(sc, GUS_MAX_VOICES); /* initialize all voices */
        gusreset(sc, GUS_MIN_VOICES); /* then set to just the ones we use */

        /*
         * Setup the IRQ and DRQ lines in software, using values from
         * config file
         */

        m = GUSMASK_LINE_IN|GUSMASK_LINE_OUT;           /* disable all */

        c = ((unsigned char) gus_irq_map[ia->ia_irq]) | GUSMASK_BOTH_RQ;

        if (sc->sc_recdrq == sc->sc_drq)
                d = (unsigned char) (gus_drq_map[sc->sc_drq] |
                                GUSMASK_BOTH_RQ);
        else
                d = (unsigned char) (gus_drq_map[sc->sc_drq] |
                                gus_drq_map[sc->sc_recdrq] << 3);

        /*
         * Program the IRQ and DMA channels on the GUS.  Note that we hardwire
         * the GUS to only use one IRQ channel, but we give the user the
         * option of using two DMA channels (the other one given by the drq2
         * option in the config file).  Two DMA channels are needed for full-
         * duplex operation.
         *
         * The order of these operations is very magical.
         */

        s = intr_disable();             /* XXX needed? */

        bus_space_write_1(iot, sc->sc_ioh1, GUS_REG_CONTROL, GUS_REG_IRQCTL);
        bus_space_write_1(iot, sc->sc_ioh1, GUS_MIX_CONTROL, m);
        bus_space_write_1(iot, sc->sc_ioh1, GUS_IRQCTL_CONTROL, 0x00);
        bus_space_write_1(iot, sc->sc_ioh1, 0x0f, 0x00);

        bus_space_write_1(iot, sc->sc_ioh1, GUS_MIX_CONTROL, m);

        /* magic reset? */
        bus_space_write_1(iot, sc->sc_ioh1, GUS_DMA_CONTROL, d | 0x80);

        bus_space_write_1(iot, sc->sc_ioh1, GUS_MIX_CONTROL,
            m | GUSMASK_CONTROL_SEL);
        bus_space_write_1(iot, sc->sc_ioh1, GUS_IRQ_CONTROL, c);

        bus_space_write_1(iot, sc->sc_ioh1, GUS_MIX_CONTROL, m);
        bus_space_write_1(iot, sc->sc_ioh1, GUS_DMA_CONTROL, d);

        bus_space_write_1(iot, sc->sc_ioh1, GUS_MIX_CONTROL,
            m | GUSMASK_CONTROL_SEL);
        bus_space_write_1(iot, sc->sc_ioh1, GUS_IRQ_CONTROL, c);

        bus_space_write_1(iot, sc->sc_ioh2, GUS_VOICE_SELECT, 0x00);

        /* enable line in, line out.  leave mic disabled. */
        bus_space_write_1(iot, sc->sc_ioh1, GUS_MIX_CONTROL,
             (m | GUSMASK_LATCHES) & ~(GUSMASK_LINE_OUT|GUSMASK_LINE_IN));
        bus_space_write_1(iot, sc->sc_ioh2, GUS_VOICE_SELECT, 0x00);

        intr_restore(s);

        sc->sc_mixcontrol =
                (m | GUSMASK_LATCHES) & ~(GUSMASK_LINE_OUT|GUSMASK_LINE_IN);

        sc->sc_codec.sc_isa = sc->sc_isa;

        if (sc->sc_revision >= 5 && sc->sc_revision <= 9) {
                sc->sc_flags |= GUS_MIXER_INSTALLED;
                gus_init_ics2101(sc);
        }
        if (sc->sc_revision < 10 || !gus_init_cs4231(sc)) {
                /* Not using the CS4231, so create our DMA maps. */
                if (sc->sc_drq != -1) {
                        if (isa_dmamap_create(sc->sc_isa, sc->sc_drq,
                            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_drq);
                                return;
                        }
                }
                if (sc->sc_recdrq != -1 && sc->sc_recdrq != sc->sc_drq) {
                        if (isa_dmamap_create(sc->sc_isa, sc->sc_recdrq,
                            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_recdrq);
                                return;
                        }
                }
        }

        timeout_set(&sc->sc_dma_tmo, gus_dmaout_timeout, sc);

        SELECT_GUS_REG(iot, sc->sc_ioh2, GUSREG_RESET);
        /*
         * Check to see how much memory we have on this card; see if any
         * "mirroring" occurs.  We're assuming at least 256K already exists
         * on the card; otherwise the initial probe would have failed
         */

        guspoke(iot, sc->sc_ioh2, 0L, 0x00);
        for(i = 1; i < 1024; i++) {
                u_long loc;

                /*
                 * See if we've run into mirroring yet
                 */

                if (guspeek(iot, sc->sc_ioh2, 0L) != 0)
                        break;

                loc = i << 10;

                guspoke(iot, sc->sc_ioh2, loc, 0xaa);
                if (guspeek(iot, sc->sc_ioh2, loc) != 0xaa)
                        break;
        }

        sc->sc_dsize = i;
        /*
         * The "official" (3.x) version number cannot easily be obtained.
         * The revision register does not correspond to the minor number
         * of the board version. Simply use the revision register as
         * identification.
         */
        printf(": ver %d", sc->sc_revision);
        if (sc->sc_revision >= 10)
                printf(", MAX");
        else {
                if (HAS_MIXER(sc))
                        printf(", ICS2101 mixer");
                if (HAS_CODEC(sc))
                        printf(", %s codec/mixer", sc->sc_codec.chip_name);
        }
        printf(", %dKB DRAM, ", sc->sc_dsize);
        if (sc->sc_recdrq == sc->sc_drq) {
                printf("half-duplex");
        } else {
                printf("full-duplex, record drq %d", sc->sc_recdrq);
        }

        printf("\n");

        /*
         * Setup a default interrupt handler
         */

        sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq,
            IST_EDGE, IPL_AUDIO | IPL_MPSAFE,
            gusintr, sc /* sc->sc_gusdsp */, sc->sc_dev.dv_xname);

        /*
         * Set some default values
         * XXX others start with 8kHz mono mulaw
         */

        sc->sc_irate = sc->sc_orate = 44100;
        sc->sc_encoding = AUDIO_ENCODING_SLINEAR_LE;
        sc->sc_precision = 16;
        sc->sc_voc[GUS_VOICE_LEFT].voccntl |= GUSMASK_DATA_SIZE16;
        sc->sc_voc[GUS_VOICE_RIGHT].voccntl |= GUSMASK_DATA_SIZE16;
        sc->sc_channels = 1;
        sc->sc_ogain = 340;
        gus_commit_settings(sc);

        /*
         * We always put the left channel full left & right channel
         * full right.
         * For mono playback, we set up both voices playing the same buffer.
         */
        bus_space_write_1(iot, sc->sc_ioh2, GUS_VOICE_SELECT,
            (u_char)GUS_VOICE_LEFT);
        SELECT_GUS_REG(iot, sc->sc_ioh2, GUSREG_PAN_POS);
        bus_space_write_1(iot, sc->sc_ioh2, GUS_DATA_HIGH, GUS_PAN_FULL_LEFT);

        bus_space_write_1(iot, sc->sc_ioh2, GUS_VOICE_SELECT,
            (u_char)GUS_VOICE_RIGHT);
        SELECT_GUS_REG(iot, sc->sc_ioh2, GUSREG_PAN_POS);
        bus_space_write_1(iot, sc->sc_ioh2, GUS_DATA_HIGH, GUS_PAN_FULL_RIGHT);

        /*
         * Attach to the generic audio layer
         */

        if (HAS_CODEC(sc)) {
                audio_attach_mi(&gusmax_hw_if, (void *)&sc->sc_codec, NULL,
                    &sc->sc_dev);
        } else {
                audio_attach_mi(&gus_hw_if, (void *)sc, NULL, &sc->sc_dev);
        }
}

/*
 * Test to see if a particular I/O base is valid for the GUS.  Return true
 * if it is.
 */

int
gus_test_iobase(bus_space_tag_t iot, int iobase)
{
        bus_space_handle_t ioh1, ioh2, ioh3, ioh4;
        u_char s1, s2;
        int rv = 0;

        /* Map i/o space */
        if (bus_space_map(iot, iobase, GUS_NPORT1, 0, &ioh1))
                return 0;
        if (bus_space_map(iot, iobase+GUS_IOH2_OFFSET, GUS_NPORT2, 0, &ioh2))
                goto bad1;

        /* XXX Maybe we shouldn't fail on mapping this, but just assume
         * the card is of revision 0? */
        if (bus_space_map(iot, iobase+GUS_IOH3_OFFSET, GUS_NPORT3, 0, &ioh3))
                goto bad2;

        if (bus_space_map(iot, iobase+GUS_IOH4_OFFSET, GUS_NPORT4, 0, &ioh4))
                goto bad3;

        /*
         * Reset GUS to an initial state before we do anything.
         */

        mtx_enter(&audio_lock);
        delay(500);

        SELECT_GUS_REG(iot, ioh2, GUSREG_RESET);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, 0x00);

        delay(500);

        SELECT_GUS_REG(iot, ioh2, GUSREG_RESET);
        bus_space_write_1(iot, ioh2, GUS_DATA_HIGH, GUSMASK_MASTER_RESET);

        delay(500);

        mtx_leave(&audio_lock);

        /*
         * See if we can write to the board's memory
         */

        s1 = guspeek(iot, ioh2, 0L);
        s2 = guspeek(iot, ioh2, 1L);

        guspoke(iot, ioh2, 0L, 0xaa);
        guspoke(iot, ioh2, 1L, 0x55);

        if (guspeek(iot, ioh2, 0L) != 0xaa)
                goto bad;

        guspoke(iot, ioh2, 0L, s1);
        guspoke(iot, ioh2, 1L, s2);

        rv = 1;

bad:
        bus_space_unmap(iot, ioh4, GUS_NPORT4);
bad3:
        bus_space_unmap(iot, ioh3, GUS_NPORT3);
bad2:
        bus_space_unmap(iot, ioh2, GUS_NPORT2);
bad1:
        bus_space_unmap(iot, ioh1, GUS_NPORT1);
        return rv;
}