text: /*	$NetBSD: sbdsp.c,v 1.76.2.1 1997/12/09 20:33:21 thorpej Exp $	*/
  
  /*
   * Copyright (c) 1991-1993 Regents of the University of California.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the Computer Systems
   *	Engineering Group at Lawrence Berkeley Laboratory.
   * 4. Neither the name of the University nor of the Laboratory may be used
   *    to endorse or promote products derived from this software without
   *    specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  
  /*
   * SoundBlaster Pro code provided by John Kohl, based on lots of
   * information he gleaned from Steve Haehnichen <steve@vigra.com>'s
   * SBlast driver for 386BSD and DOS driver code from Daniel Sachs
   * <sachs@meibm15.cen.uiuc.edu>.
   * Lots of rewrites by Lennart Augustsson <augustss@cs.chalmers.se>
   * with information from SB "Hardware Programming Guide" and the
   * Linux drivers.
   */
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/errno.h>
  #include <sys/ioctl.h>
  #include <sys/syslog.h>
  #include <sys/device.h>
  #include <sys/proc.h>
  #include <sys/buf.h>
  #include <vm/vm.h>
  
  #include <machine/cpu.h>
  #include <machine/intr.h>
  #include <machine/bus.h>
  
  #include <sys/audioio.h>
  #include <dev/audio_if.h>
  #include <dev/mulaw.h>
  #include <dev/auconv.h>
  
  #include <dev/isa/isavar.h>
  #include <dev/isa/isadmavar.h>
  
  #include <dev/isa/sbreg.h>
  #include <dev/isa/sbdspvar.h>
  
  #ifdef AUDIO_DEBUG
  #define DPRINTF(x)	if (sbdspdebug) printf x
  int	sbdspdebug = 0;
  #else
  #define DPRINTF(x)
  #endif
  
  #ifndef SBDSP_NPOLL
  #define SBDSP_NPOLL 3000
  #endif
  
  struct {
  	int wdsp;
  	int rdsp;
  	int wmidi;
  } sberr;
  
  /*
   * Time constant routines follow.  See SBK, section 12.
   * Although they don't come out and say it (in the docs),
   * the card clearly uses a 1MHz countdown timer, as the
   * low-speed formula (p. 12-4) is:
   *	tc = 256 - 10^6 / sr
   * In high-speed mode, the constant is the upper byte of a 16-bit counter,
   * and a 256MHz clock is used:
   *	tc = 65536 - 256 * 10^ 6 / sr
   * Since we can only use the upper byte of the HS TC, the two formulae
   * are equivalent.  (Why didn't they say so?)  E.g.,
   * 	(65536 - 256 * 10 ^ 6 / x) >> 8 = 256 - 10^6 / x
   *
   * The crossover point (from low- to high-speed modes) is different
   * for the SBPRO and SB20.  The table on p. 12-5 gives the following data:
   *
   *				SBPRO			SB20
   *				-----			--------
   * input ls min			4	KHz		4	KHz
   * input ls max			23	KHz		13	KHz
   * input hs max			44.1	KHz		15	KHz
   * output ls min		4	KHz		4	KHz
   * output ls max		23	KHz		23	KHz
   * output hs max		44.1	KHz		44.1	KHz
   */
  /* XXX Should we round the tc?
  #define SB_RATE_TO_TC(x) (((65536 - 256 * 1000000 / (x)) + 128) >> 8)
  */
  #define SB_RATE_TO_TC(x) (256 - 1000000 / (x))
  #define SB_TC_TO_RATE(tc) (1000000 / (256 - (tc)))
  
  struct sbmode {
  	short	model;
  	u_char	channels;
  	u_char	precision;
  	u_short	lowrate, highrate;
  	u_char	cmd;
  	u_char	cmdchan;
  };
  static struct sbmode sbpmodes[] = {
   { SB_1,    1,  8,  4000, 22727, SB_DSP_WDMA      },
   { SB_20,   1,  8,  4000, 22727, SB_DSP_WDMA_LOOP },
   { SB_2x,   1,  8,  4000, 22727, SB_DSP_WDMA_LOOP },
   { SB_2x,   1,  8, 22727, 45454, SB_DSP_HS_OUTPUT },
   { SB_PRO,  1,  8,  4000, 22727, SB_DSP_WDMA_LOOP },
   { SB_PRO,  1,  8, 22727, 45454, SB_DSP_HS_OUTPUT },
   { SB_PRO,  2,  8, 11025, 22727, SB_DSP_HS_OUTPUT },
   /* Yes, we write the record mode to set 16-bit playback mode. weird, huh? */
   { SB_JAZZ, 1,  8,  4000, 22727, SB_DSP_WDMA_LOOP, SB_DSP_RECORD_MONO },
   { SB_JAZZ, 1,  8, 22727, 45454, SB_DSP_HS_OUTPUT, SB_DSP_RECORD_MONO },
   { SB_JAZZ, 2,  8, 11025, 22727, SB_DSP_HS_OUTPUT, SB_DSP_RECORD_STEREO },
   { SB_JAZZ, 1, 16,  4000, 22727, SB_DSP_WDMA_LOOP, JAZZ16_RECORD_MONO },
   { SB_JAZZ, 1, 16, 22727, 45454, SB_DSP_HS_OUTPUT, JAZZ16_RECORD_MONO },
   { SB_JAZZ, 2, 16, 11025, 22727, SB_DSP_HS_OUTPUT, JAZZ16_RECORD_STEREO },
   { SB_16,   1,  8,  5000, 45000, SB_DSP16_WDMA_8  },
   { SB_16,   2,  8,  5000, 45000, SB_DSP16_WDMA_8  },
  #define PLAY16 15 /* must be the index of the next entry in the table */
   { SB_16,   1, 16,  5000, 45000, SB_DSP16_WDMA_16 },
   { SB_16,   2, 16,  5000, 45000, SB_DSP16_WDMA_16 },
   { -1 }
  };
  static struct sbmode sbrmodes[] = {
   { SB_1,    1,  8,  4000, 12987, SB_DSP_RDMA      },
   { SB_20,   1,  8,  4000, 12987, SB_DSP_RDMA_LOOP },
   { SB_2x,   1,  8,  4000, 12987, SB_DSP_RDMA_LOOP },
   { SB_2x,   1,  8, 12987, 14925, SB_DSP_HS_INPUT  },
   { SB_PRO,  1,  8,  4000, 22727, SB_DSP_RDMA_LOOP, SB_DSP_RECORD_MONO },
   { SB_PRO,  1,  8, 22727, 45454, SB_DSP_HS_INPUT,  SB_DSP_RECORD_MONO },
   { SB_PRO,  2,  8, 11025, 22727, SB_DSP_HS_INPUT,  SB_DSP_RECORD_STEREO },
   { SB_JAZZ, 1,  8,  4000, 22727, SB_DSP_RDMA_LOOP, SB_DSP_RECORD_MONO },
   { SB_JAZZ, 1,  8, 22727, 45454, SB_DSP_HS_INPUT,  SB_DSP_RECORD_MONO },
   { SB_JAZZ, 2,  8, 11025, 22727, SB_DSP_HS_INPUT,  SB_DSP_RECORD_STEREO },
   { SB_JAZZ, 1, 16,  4000, 22727, SB_DSP_RDMA_LOOP, JAZZ16_RECORD_MONO },
   { SB_JAZZ, 1, 16, 22727, 45454, SB_DSP_HS_INPUT,  JAZZ16_RECORD_MONO },
   { SB_JAZZ, 2, 16, 11025, 22727, SB_DSP_HS_INPUT,  JAZZ16_RECORD_STEREO },
   { SB_16,   1,  8,  5000, 45000, SB_DSP16_RDMA_8  },
   { SB_16,   2,  8,  5000, 45000, SB_DSP16_RDMA_8  },
   { SB_16,   1, 16,  5000, 45000, SB_DSP16_RDMA_16 },
   { SB_16,   2, 16,  5000, 45000, SB_DSP16_RDMA_16 },
   { -1 }
  };
  
  void	sbversion __P((struct sbdsp_softc *));
  void	sbdsp_jazz16_probe __P((struct sbdsp_softc *));
  void	sbdsp_set_mixer_gain __P((struct sbdsp_softc *sc, int port));
  void	sbdsp_to __P((void *));
  void	sbdsp_pause __P((struct sbdsp_softc *));
  int	sbdsp_set_timeconst __P((struct sbdsp_softc *, int));
  int	sbdsp16_set_rate __P((struct sbdsp_softc *, int, int));
  int	sbdsp_set_in_ports __P((struct sbdsp_softc *, int));
  void	sbdsp_set_ifilter __P((void *, int));
  int	sbdsp_get_ifilter __P((void *));
  
  static	int sbdsp_dma_setup_input __P((struct sbdsp_softc *sc));
  static	int sbdsp_dma_setup_output __P((struct sbdsp_softc *sc));
  static	int sbdsp_adjust __P((int, int));
  
  #ifdef AUDIO_DEBUG
  void sb_printsc __P((struct sbdsp_softc *));
  
  void
  sb_printsc(sc)
  	struct sbdsp_softc *sc;
  {
  	int i;
      
  	printf("open %d dmachan %d/%d %d/%d iobase 0x%x irq %d\n",
  	    (int)sc->sc_open, sc->sc_i.run, sc->sc_o.run, 
  	    sc->sc_drq8, sc->sc_drq16,
  	    sc->sc_iobase, sc->sc_irq);
  	printf("irate %d itc %x orate %d otc %x\n",
  	    sc->sc_i.rate, sc->sc_i.tc,
  	    sc->sc_o.rate, sc->sc_o.tc);
  	printf("spkron %u nintr %lu\n",
  	    sc->spkr_state, sc->sc_interrupts);
  	printf("intr8 %p arg8 %p\n",
  	    sc->sc_intr8, sc->sc_arg16);
  	printf("intr16 %p arg16 %p\n",
  	    sc->sc_intr8, sc->sc_arg16);
  	printf("gain:");
  	for (i = 0; i < SB_NDEVS; i++)
  		printf(" %u,%u", sc->gain[i][SB_LEFT], sc->gain[i][SB_RIGHT]);
  	printf("\n");
  }
  #endif /* AUDIO_DEBUG */
  
  /*
   * Probe / attach routines.
   */
  
  /*
   * Probe for the soundblaster hardware.
   */
  int
  sbdsp_probe(sc)
  	struct sbdsp_softc *sc;
  {
  
  	if (sbdsp_reset(sc) < 0) {
  		DPRINTF(("sbdsp: couldn't reset card\n"));
  		return 0;
  	}
  #ifndef SHARK
  	/* if flags set, go and probe the jazz16 stuff */
  	if (sc->sc_dev.dv_cfdata->cf_flags & 1)
  		sbdsp_jazz16_probe(sc);
  	else
  #endif
  		sbversion(sc);
  	if (sc->sc_model == SB_UNK) {
  		/* Unknown SB model found. */
  		DPRINTF(("sbdsp: unknown SB model found\n"));
  		return 0;
  	}
  	return 1;
  }
  
  /*
   * Try add-on stuff for Jazz16.
   */
  void
  sbdsp_jazz16_probe(sc)
  	struct sbdsp_softc *sc;
  {
  	static u_char jazz16_irq_conf[16] = {
  	    -1, -1, 0x02, 0x03,
  	    -1, 0x01, -1, 0x04,
  	    -1, 0x02, 0x05, -1,
  	    -1, -1, -1, 0x06};
  	static u_char jazz16_drq_conf[8] = {
  	    -1, 0x01, -1, 0x02,
  	    -1, 0x03, -1, 0x04};
  
  	bus_space_tag_t iot = sc->sc_iot;
  	bus_space_handle_t ioh;
  
  	sbversion(sc);
  
  	DPRINTF(("jazz16 probe\n"));
  
  	if (bus_space_map(iot, JAZZ16_CONFIG_PORT, 1, 0, &ioh)) {
  		DPRINTF(("bus map failed\n"));
  		return;
  	}
  
  	if (jazz16_drq_conf[sc->sc_drq8] == (u_char)-1 ||
  	    jazz16_irq_conf[sc->sc_irq] == (u_char)-1) {
  		DPRINTF(("drq/irq check failed\n"));
  		goto done;		/* give up, we can't do it. */
  	}
  
  	bus_space_write_1(iot, ioh, 0, JAZZ16_WAKEUP);
  	delay(10000);			/* delay 10 ms */
  	bus_space_write_1(iot, ioh, 0, JAZZ16_SETBASE);
  	bus_space_write_1(iot, ioh, 0, sc->sc_iobase & 0x70);
  
  	if (sbdsp_reset(sc) < 0) {
  		DPRINTF(("sbdsp_reset check failed\n"));
  		goto done;		/* XXX? what else could we do? */
  	}
  
  	if (sbdsp_wdsp(sc, JAZZ16_READ_VER)) {
  		DPRINTF(("read16 setup failed\n"));
  		goto done;
  	}
  
  	if (sbdsp_rdsp(sc) != JAZZ16_VER_JAZZ) {
  		DPRINTF(("read16 failed\n"));
  		goto done;
  	}
  
  	/* XXX set both 8 & 16-bit drq to same channel, it works fine. */
  	sc->sc_drq16 = sc->sc_drq8;
  	if (sbdsp_wdsp(sc, JAZZ16_SET_DMAINTR) ||
  	    sbdsp_wdsp(sc, (jazz16_drq_conf[sc->sc_drq16] << 4) |
  		jazz16_drq_conf[sc->sc_drq8]) ||
  	    sbdsp_wdsp(sc, jazz16_irq_conf[sc->sc_irq])) {
  		DPRINTF(("sbdsp: can't write jazz16 probe stuff\n"));
  	} else {
  		DPRINTF(("jazz16 detected!\n"));
  		sc->sc_model = SB_JAZZ;
  		sc->sc_mixer_model = SBM_CT1345; /* XXX really? */
  	}
  
  done:
  	bus_space_unmap(iot, ioh, 1);
  }
  
  /*
   * Attach hardware to driver, attach hardware driver to audio
   * pseudo-device driver .
   */
  void
  sbdsp_attach(sc)
  	struct sbdsp_softc *sc;
  {
  	struct audio_params pparams, rparams;
          int i;
          u_int v;
  
  	/*
  	 * Create our DMA maps.
  	 */
  	if (sc->sc_drq8 != -1) {
  		if (isa_dmamap_create(sc->sc_isa, sc->sc_drq8,
  		    MAX_ISADMA, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW)) {
  			printf("%s: can't create map for drq %d\n",
  			    sc->sc_dev.dv_xname, sc->sc_drq8);
  			return;
  		}
  	}
  	if (sc->sc_drq16 != -1 && sc->sc_drq16 != sc->sc_drq8) {
  		if (isa_dmamap_create(sc->sc_isa, sc->sc_drq16,
  		    MAX_ISADMA, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW)) {
  			printf("%s: can't create map for drq %d\n",
  			    sc->sc_dev.dv_xname, sc->sc_drq16);
  			return;
  		}
  	}
  
  	pparams = audio_default;
  	rparams = audio_default;
          sbdsp_set_params(sc, AUMODE_RECORD|AUMODE_PLAY, 0, &pparams, &rparams);
  
  	sbdsp_set_in_ports(sc, 1 << SB_MIC_VOL);
  
  	if (sc->sc_mixer_model != SBM_NONE) {
          	/* Reset the mixer.*/
  		sbdsp_mix_write(sc, SBP_MIX_RESET, SBP_MIX_RESET);
                  /* And set our own default values */
  		for (i = 0; i < SB_NDEVS; i++) {
  			switch(i) {
  			case SB_MIC_VOL:
  			case SB_LINE_IN_VOL:
  				v = 0;
  				break;
  			case SB_BASS:
  			case SB_TREBLE:
  				v = SB_ADJUST_GAIN(sc, AUDIO_MAX_GAIN/2);
  				break;
  			case SB_CD_IN_MUTE:
  			case SB_MIC_IN_MUTE:
  			case SB_LINE_IN_MUTE:
  			case SB_MIDI_IN_MUTE:
  			case SB_CD_SWAP:
  			case SB_MIC_SWAP:
  			case SB_LINE_SWAP:
  			case SB_MIDI_SWAP:
  			case SB_CD_OUT_MUTE:
  			case SB_MIC_OUT_MUTE:
  			case SB_LINE_OUT_MUTE:
  				v = 0;
  				break;
  			default:
  				v = SB_ADJUST_GAIN(sc, AUDIO_MAX_GAIN / 2);
  				break;
  			}
  			sc->gain[i][SB_LEFT] = sc->gain[i][SB_RIGHT] = v;
  			sbdsp_set_mixer_gain(sc, i);
  		}
  		sc->in_filter = 0;	/* no filters turned on, please */
  	}
  
  	printf(": dsp v%d.%02d%s\n",
  	       SBVER_MAJOR(sc->sc_version), SBVER_MINOR(sc->sc_version),
  	       sc->sc_model == SB_JAZZ ? ": <Jazz16>" : "");
  
  	sc->sc_fullduplex = ISSB16CLASS(sc) && 
  		sc->sc_drq8 != -1 && sc->sc_drq16 != -1 &&
  		sc->sc_drq8 != sc->sc_drq16;
  }
  
  void
  sbdsp_mix_write(sc, mixerport, val)
  	struct sbdsp_softc *sc;
  	int mixerport;
  	int val;
  {
  	bus_space_tag_t iot = sc->sc_iot;
  	bus_space_handle_t ioh = sc->sc_ioh;
  	int s;
  
  	s = splaudio();
  	bus_space_write_1(iot, ioh, SBP_MIXER_ADDR, mixerport);
  	delay(20);
  	bus_space_write_1(iot, ioh, SBP_MIXER_DATA, val);
  	delay(30);
  	splx(s);
  }
  
  int
  sbdsp_mix_read(sc, mixerport)
  	struct sbdsp_softc *sc;
  	int mixerport;
  {
  	bus_space_tag_t iot = sc->sc_iot;
  	bus_space_handle_t ioh = sc->sc_ioh;
  	int val;
  	int s;
  
  	s = splaudio();
  	bus_space_write_1(iot, ioh, SBP_MIXER_ADDR, mixerport);
  	delay(20);
  	val = bus_space_read_1(iot, ioh, SBP_MIXER_DATA);
  	delay(30);
  	splx(s);
  	return val;
  }
  
  /*
   * Various routines to interface to higher level audio driver
   */
  
  int
  sbdsp_query_encoding(addr, fp)
  	void *addr;
  	struct audio_encoding *fp;
  {
  	struct sbdsp_softc *sc = addr;
  	int emul;
  
  	emul = ISSB16CLASS(sc) ? 0 : AUDIO_ENCODINGFLAG_EMULATED;
  
  	switch (fp->index) {
  	case 0:
  		strcpy(fp->name, AudioEulinear);
  		fp->encoding = AUDIO_ENCODING_ULINEAR;
  		fp->precision = 8;
  		fp->flags = 0;
  		return 0;
  	case 1:
  		strcpy(fp->name, AudioEmulaw);
  		fp->encoding = AUDIO_ENCODING_ULAW;
  		fp->precision = 8;
  		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
  		return 0;
  	case 2:
  		strcpy(fp->name, AudioEalaw);
  		fp->encoding = AUDIO_ENCODING_ALAW;
  		fp->precision = 8;
  		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
  		return 0;
  	case 3:
  		strcpy(fp->name, AudioEslinear);
  		fp->encoding = AUDIO_ENCODING_SLINEAR;
  		fp->precision = 8;
  		fp->flags = emul;
  		return 0;
          }
          if (!ISSB16CLASS(sc) && sc->sc_model != SB_JAZZ)
  		return EINVAL;
  
          switch(fp->index) {
          case 4:
  		strcpy(fp->name, AudioEslinear_le);
  		fp->encoding = AUDIO_ENCODING_SLINEAR_LE;
  		fp->precision = 16;
  		fp->flags = 0;
  		return 0;
  	case 5:
  		strcpy(fp->name, AudioEulinear_le);
  		fp->encoding = AUDIO_ENCODING_ULINEAR_LE;
  		fp->precision = 16;
  		fp->flags = emul;
  		return 0;
  	case 6:
  		strcpy(fp->name, AudioEslinear_be);
  		fp->encoding = AUDIO_ENCODING_SLINEAR_BE;
  		fp->precision = 16;
  		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
  		return 0;
  	case 7:
  		strcpy(fp->name, AudioEulinear_be);
  		fp->encoding = AUDIO_ENCODING_ULINEAR_BE;
  		fp->precision = 16;
  		fp->flags = AUDIO_ENCODINGFLAG_EMULATED;
  		return 0;
  	default:
  		return EINVAL;
  	}
  	return 0;
  }
  
  int
  sbdsp_set_params(addr, setmode, usemode, play, rec)
  	void *addr;
  	int setmode, usemode;
  	struct audio_params *play, *rec;
  {
  	struct sbdsp_softc *sc = addr;
  	struct sbmode *m;
  	u_int rate, tc, bmode;
  	void (*swcode) __P((void *, u_char *buf, int cnt));
  	int factor;
  	int model;
  	int chan;
  	struct audio_params *p;
  	int mode;
  
  	model = sc->sc_model;
  	if (model > SB_16) 
  		model = SB_16;	/* later models work like SB16 */
  
  	/* Set first record info, then play info */
  	for(mode = AUMODE_RECORD; mode != -1; 
  	    mode = mode == AUMODE_RECORD ? AUMODE_PLAY : -1) {
  		if ((setmode & mode) == 0)
  			continue;
  
  		p = mode == AUMODE_PLAY ? play : rec;
  		/* Locate proper commands */
  		for(m = mode == AUMODE_PLAY ? sbpmodes : sbrmodes; 
  		    m->model != -1; m++) {
  			if (model == m->model &&
  			    p->channels == m->channels &&
  			    p->precision == m->precision &&
  			    p->sample_rate >= m->lowrate && 
  			    p->sample_rate < m->highrate)
  				break;
  		}
  		if (m->model == -1)
  			return EINVAL;
  		rate = p->sample_rate;
  		swcode = 0;
  		factor = 1;
  		tc = 1;
  		bmode = -1;
  		if (model == SB_16) {
  			switch (p->encoding) {
  			case AUDIO_ENCODING_SLINEAR_BE:
  				if (p->precision == 16)
  					swcode = swap_bytes;
  				/* fall into */
  			case AUDIO_ENCODING_SLINEAR_LE:
  				bmode = SB_BMODE_SIGNED;
  				break;
  			case AUDIO_ENCODING_ULINEAR_BE:
  				if (p->precision == 16)
  					swcode = swap_bytes;
  				/* fall into */
  			case AUDIO_ENCODING_ULINEAR_LE:
  				bmode = SB_BMODE_UNSIGNED;
  				break;
  			case AUDIO_ENCODING_ULAW:
  				if (mode == AUMODE_PLAY) {
  					swcode = mulaw_to_ulinear16;
  					factor = 2;
  					m = &sbpmodes[PLAY16];
  				} else
  					swcode = ulinear8_to_mulaw;
  				bmode = SB_BMODE_UNSIGNED;
  				break;
  			case AUDIO_ENCODING_ALAW:
  				if (mode == AUMODE_PLAY) {
  					swcode = alaw_to_ulinear16;
  					factor = 2;
  					m = &sbpmodes[PLAY16];
  				} else
  					swcode = ulinear8_to_alaw;
  				bmode = SB_BMODE_UNSIGNED;
  				break;
  			default:
  				return EINVAL;
  			}
  			if (p->channels == 2)
  				bmode |= SB_BMODE_STEREO;
  		} else if (m->model == SB_JAZZ && m->precision == 16) {
  			switch (p->encoding) {
  			case AUDIO_ENCODING_SLINEAR_LE:
  				break;
  			case AUDIO_ENCODING_ULINEAR_LE:
  				swcode = change_sign16;
  				break;
  			case AUDIO_ENCODING_SLINEAR_BE:
  				swcode = swap_bytes;
  				break;
  			case AUDIO_ENCODING_ULINEAR_BE:
  				swcode = mode == AUMODE_PLAY ?
  					swap_bytes_change_sign16 : change_sign16_swap_bytes;
  				break;
  			case AUDIO_ENCODING_ULAW:
  				swcode = mode == AUMODE_PLAY ? 
  					mulaw_to_ulinear8 : ulinear8_to_mulaw;
  				break;
  			case AUDIO_ENCODING_ALAW:
  				swcode = mode == AUMODE_PLAY ? 
  					alaw_to_ulinear8 : ulinear8_to_alaw;
  				break;
  			default:
  				return EINVAL;
  			}
  			tc = SB_RATE_TO_TC(p->sample_rate * p->channels);
  			p->sample_rate = SB_TC_TO_RATE(tc) / p->channels;
  		} else {
  			switch (p->encoding) {
  			case AUDIO_ENCODING_SLINEAR_BE:
  			case AUDIO_ENCODING_SLINEAR_LE:
  				swcode = change_sign8;
  				break;
  			case AUDIO_ENCODING_ULINEAR_BE:
  			case AUDIO_ENCODING_ULINEAR_LE:
  				break;
  			case AUDIO_ENCODING_ULAW:
  				swcode = mode == AUMODE_PLAY ? 
  					mulaw_to_ulinear8 : ulinear8_to_mulaw;
  				break;
  			case AUDIO_ENCODING_ALAW:
  				swcode = mode == AUMODE_PLAY ? 
  					alaw_to_ulinear8 : ulinear8_to_alaw;
  				break;
  			default:
  				return EINVAL;
  			}
  			tc = SB_RATE_TO_TC(p->sample_rate * p->channels);
  			p->sample_rate = SB_TC_TO_RATE(tc) / p->channels;
  		}
  
  		chan = m->precision == 16 ? sc->sc_drq16 : sc->sc_drq8;
  		if (mode == AUMODE_PLAY) {
  			sc->sc_o.rate = rate;
  			sc->sc_o.tc = tc;
  			sc->sc_o.modep = m;
  			sc->sc_o.bmode = bmode;
  			sc->sc_o.dmachan = chan;
  		} else {
  			sc->sc_i.rate = rate;
  			sc->sc_i.tc = tc;
  			sc->sc_i.modep = m;
  			sc->sc_i.bmode = bmode;
  			sc->sc_i.dmachan = chan;
  		}
  
  		p->sw_code = swcode;
  		p->factor = factor;
  		DPRINTF(("sbdsp_set_params: model=%d, mode=%d, rate=%ld, prec=%d, chan=%d, enc=%d -> tc=%02x, cmd=%02x, bmode=%02x, cmdchan=%02x, swcode=%p, factor=%d\n", 
  			 sc->sc_model, mode, p->sample_rate, p->precision, p->channels,
  			 p->encoding, tc, m->cmd, bmode, m->cmdchan, swcode, factor));
  
  	}
  	/*
  	 * XXX
  	 * Should wait for chip to be idle.
  	 */
  	sc->sc_i.run = SB_NOTRUNNING;
  	sc->sc_o.run = SB_NOTRUNNING;
  
  	if (sc->sc_fullduplex &&
  	    (usemode & (AUMODE_PLAY | AUMODE_RECORD)) == (AUMODE_PLAY | AUMODE_RECORD) &&
  	    sc->sc_i.dmachan == sc->sc_o.dmachan) {
  		DPRINTF(("sbdsp_commit: fd=%d, usemode=%d, idma=%d, odma=%d\n", sc->sc_fullduplex, usemode, sc->sc_i.dmachan, sc->sc_o.dmachan));
  		if (sc->sc_o.dmachan == sc->sc_drq8) {
  			/* Use 16 bit DMA for playing by expanding the samples. */
  			play->sw_code = linear8_to_linear16;
  			play->factor = 2;
  			sc->sc_o.modep = &sbpmodes[PLAY16];
  			sc->sc_o.dmachan = sc->sc_drq16;
  		} else {
  			return EINVAL;
  		}
  	}
  	DPRINTF(("sbdsp_set_params ichan=%d, ochan=%d\n", sc->sc_i.dmachan, sc->sc_o.dmachan));
  
  	return 0;
  }
  
  void
  sbdsp_set_ifilter(addr, which)
  	void *addr;
  	int which;
  {
  	struct sbdsp_softc *sc = addr;
  	int mixval;
  
  	mixval = sbdsp_mix_read(sc, SBP_INFILTER) & ~SBP_IFILTER_MASK;
  	switch (which) {
  	case 0:
  		mixval |= SBP_FILTER_OFF;
  		break;
  	case SB_TREBLE:
  		mixval |= SBP_FILTER_ON | SBP_IFILTER_HIGH;
  		break;
  	case SB_BASS:
  		mixval |= SBP_FILTER_ON | SBP_IFILTER_LOW; 
  		break;
  	default:
  		return;
  	}
  	sc->in_filter = mixval & SBP_IFILTER_MASK;
  	sbdsp_mix_write(sc, SBP_INFILTER, mixval);
  }
  
  int
  sbdsp_get_ifilter(addr)
  	void *addr;
  {
  	struct sbdsp_softc *sc = addr;
  	
  	sc->in_filter =
  		sbdsp_mix_read(sc, SBP_INFILTER) & SBP_IFILTER_MASK;
  	switch (sc->in_filter) {
  	case SBP_FILTER_ON|SBP_IFILTER_HIGH:
  		return SB_TREBLE;
  	case SBP_FILTER_ON|SBP_IFILTER_LOW:
  		return SB_BASS;
  	default:
  		return 0;
  	}
  }
  
  int
  sbdsp_set_in_ports(sc, mask)
  	struct sbdsp_softc *sc;
  	int mask;
  {
  	int bitsl, bitsr;
  	int sbport;
  
  	DPRINTF(("sbdsp_set_in_ports: model=%d, mask=%x\n",
  		 sc->sc_mixer_model, mask));
  
  	switch(sc->sc_mixer_model) {
  	case SBM_NONE:
  		return EINVAL;
  	case SBM_CT1335:
  		if (mask != (1 << SB_MIC_VOL))
  			return EINVAL;
  		break;
  	case SBM_CT1345:
  		switch (mask) {
  		case 1 << SB_MIC_VOL:
  			sbport = SBP_FROM_MIC;
  			break;
  		case 1 << SB_LINE_IN_VOL:
  			sbport = SBP_FROM_LINE;
  			break;
  		case 1 << SB_CD_VOL:
  			sbport = SBP_FROM_CD;
  			break;
  		default:
  			return (EINVAL);
  		}
  		sbdsp_mix_write(sc, SBP_RECORD_SOURCE, sbport | sc->in_filter);
  		break;
  	case SBM_CT1XX5:
  	case SBM_CT1745:
  		if (mask & ~((1<<SB_MIDI_VOL) | (1<<SB_LINE_IN_VOL) |
  			     (1<<SB_CD_VOL) | (1<<SB_MIC_VOL)))
  			return EINVAL;
  		bitsr = 0;
  		if (mask & (1<<SB_MIDI_VOL))    bitsr |= SBP_MIDI_SRC_R;
  		if (mask & (1<<SB_LINE_IN_VOL)) bitsr |= SBP_LINE_SRC_R;
  		if (mask & (1<<SB_CD_VOL))      bitsr |= SBP_CD_SRC_R;
  		bitsl = SB_SRC_R_TO_L(bitsr);
  		if (mask & (1<<SB_MIC_VOL)) {
  			bitsl |= SBP_MIC_SRC;
  			bitsr |= SBP_MIC_SRC;
  		}
  		sbdsp_mix_write(sc, SBP_RECORD_SOURCE_L, bitsl);
  		sbdsp_mix_write(sc, SBP_RECORD_SOURCE_R, bitsr);
  		break;
  	}
  
  	sc->in_mask = mask;
  
  	return 0;
  }
  
  int
  sbdsp_speaker_ctl(addr, newstate)
  	void *addr;
  	int newstate;
  {
  	struct sbdsp_softc *sc = addr;
  
  	if ((newstate == SPKR_ON) &&
  	    (sc->spkr_state == SPKR_OFF)) {
  		sbdsp_spkron(sc);
  		sc->spkr_state = SPKR_ON;
  	}
  	if ((newstate == SPKR_OFF) &&
  	    (sc->spkr_state == SPKR_ON)) {
  		sbdsp_spkroff(sc);
  		sc->spkr_state = SPKR_OFF;
  	}
  	return 0;
  }
  
  int
  sbdsp_round_blocksize(addr, blk)
  	void *addr;
  	int blk;
  {
  	blk &= -4;		/* round to biggest sample size */
  	return blk;
  }
  
  int
  sbdsp_open(addr, flags)
  	void *addr;
  	int flags;
  {
  	struct sbdsp_softc *sc = addr;
  
          DPRINTF(("sbdsp_open: sc=%p\n", sc));
  
  	if (sc->sc_open != 0 || sbdsp_reset(sc) != 0)
  		return ENXIO;
  
  	sc->sc_open = 1;
  	sc->sc_openflags = flags;
  	sc->sc_mintr = 0;
  	if (ISSBPRO(sc) &&
  	    sbdsp_wdsp(sc, SB_DSP_RECORD_MONO) < 0) {
  		DPRINTF(("sbdsp_open: can't set mono mode\n"));
  		/* we'll readjust when it's time for DMA. */
  	}
  
  	/*
  	 * Leave most things as they were; users must change things if
  	 * the previous process didn't leave it they way they wanted.
  	 * Looked at another way, it's easy to set up a configuration
  	 * in one program and leave it for another to inherit.
  	 */
  	DPRINTF(("sbdsp_open: opened\n"));
  
  	return 0;
  }
  
  void
  sbdsp_close(addr)
  	void *addr;
  {
  	struct sbdsp_softc *sc = addr;
  
          DPRINTF(("sbdsp_close: sc=%p\n", sc));
  
  	sc->sc_open = 0;
  	sbdsp_spkroff(sc);
  	sc->spkr_state = SPKR_OFF;
  	sc->sc_intr8 = 0;
  	sc->sc_intr16 = 0;
  	sc->sc_mintr = 0;
  	sbdsp_haltdma(sc);
  
  	DPRINTF(("sbdsp_close: closed\n"));
  }
  
  /*
   * Lower-level routines
   */
  
  /*
   * Reset the card.
   * Return non-zero if the card isn't detected.
   */
  int
  sbdsp_reset(sc)
  	struct sbdsp_softc *sc;
  {
  	bus_space_tag_t iot = sc->sc_iot;
  	bus_space_handle_t ioh = sc->sc_ioh;
  
  	sc->sc_intr8 = 0;
  	sc->sc_intr16 = 0;
  	if (sc->sc_i.run != SB_NOTRUNNING) {
  		isa_dmaabort(sc->sc_isa, sc->sc_i.dmachan);
  		sc->sc_i.run = SB_NOTRUNNING;
  	}
  	if (sc->sc_o.run != SB_NOTRUNNING) {
  		isa_dmaabort(sc->sc_isa, sc->sc_o.dmachan);
  		sc->sc_o.run = SB_NOTRUNNING;
  	}
  
  	/*
  	 * See SBK, section 11.3.
  	 * We pulse a reset signal into the card.
  	 * Gee, what a brilliant hardware design.
  	 */
  	bus_space_write_1(iot, ioh, SBP_DSP_RESET, 1);
  	delay(10);
  	bus_space_write_1(iot, ioh, SBP_DSP_RESET, 0);
  	delay(30);
  	if (sbdsp_rdsp(sc) != SB_MAGIC)
  		return -1;
  
  	return 0;
  }
  
  /*
   * Write a byte to the dsp.
   * We are at the mercy of the card as we use a
   * polling loop and wait until it can take the byte.
   */
  int
  sbdsp_wdsp(sc, v)
  	struct sbdsp_softc *sc;
  	int v;
  {
  	bus_space_tag_t iot = sc->sc_iot;
  	bus_space_handle_t ioh = sc->sc_ioh;
  	int i;
  	u_char x;
  
  	for (i = SBDSP_NPOLL; --i >= 0; ) {
  		x = bus_space_read_1(iot, ioh, SBP_DSP_WSTAT);
  		delay(10);
  		if ((x & SB_DSP_BUSY) == 0) {
  			bus_space_write_1(iot, ioh, SBP_DSP_WRITE, v);
  			delay(10);
  			return 0;
  		}
  	}
  	++sberr.wdsp;
  	return -1;
  }
  
  /*
   * Read a byte from the DSP, using polling.
   */
  int
  sbdsp_rdsp(sc)
  	struct sbdsp_softc *sc;
  {
  	bus_space_tag_t iot = sc->sc_iot;
  	bus_space_handle_t ioh = sc->sc_ioh;
  	int i;
  	u_char x;
  
  	for (i = SBDSP_NPOLL; --i >= 0; ) {
  		x = bus_space_read_1(iot, ioh, SBP_DSP_RSTAT);
  		delay(10);
  		if (x & SB_DSP_READY) {
  			x = bus_space_read_1(iot, ioh, SBP_DSP_READ);
  			delay(10);
  			return x;
  		}
  	}
  	++sberr.rdsp;
  	return -1;
  }
  
  /*
   * Doing certain things (like toggling the speaker) make
   * the SB hardware go away for a while, so pause a little.
   */
  void
  sbdsp_to(arg)
  	void *arg;
  {
  	wakeup(arg);
  }
  
  void
  sbdsp_pause(sc)
  	struct sbdsp_softc *sc;
  {
  	extern int hz;
  
  	timeout(sbdsp_to, sbdsp_to, hz/8);
  	(void)tsleep(sbdsp_to, PWAIT, "sbpause", 0);
  }
  
  /*
   * Turn on the speaker.  The SBK documention says this operation
   * can take up to 1/10 of a second.  Higher level layers should
   * probably let the task sleep for this amount of time after
   * calling here.  Otherwise, things might not work (because
   * sbdsp_wdsp() and sbdsp_rdsp() will probably timeout.)
   *
   * These engineers had their heads up their ass when
   * they designed this card.
   */
  void
  sbdsp_spkron(sc)
  	struct sbdsp_softc *sc;
  {
  	(void)sbdsp_wdsp(sc, SB_DSP_SPKR_ON);
  	sbdsp_pause(sc);
  }
  
  /*
   * Turn off the speaker; see comment above.
   */
  void
  sbdsp_spkroff(sc)
  	struct sbdsp_softc *sc;
  {
  	(void)sbdsp_wdsp(sc, SB_DSP_SPKR_OFF);
  	sbdsp_pause(sc);
  }
  
  /*
   * Read the version number out of the card.
   * Store version information in the softc.
   */
  void
  sbversion(sc)
  	struct sbdsp_softc *sc;
  {
  	int v;
  
  	sc->sc_model = SB_UNK;
  	sc->sc_version = 0;
  	if (sbdsp_wdsp(sc, SB_DSP_VERSION) < 0)
  		return;
  	v = sbdsp_rdsp(sc) << 8;
  	v |= sbdsp_rdsp(sc);
  	if (v < 0)
  		return;
  	sc->sc_version = v;
  	switch(SBVER_MAJOR(v)) {
  	case 1:
  		sc->sc_mixer_model = SBM_NONE;
  		sc->sc_model = SB_1;
  		break;
  	case 2:
  		/* Some SB2 have a mixer, some don't. */
  		sbdsp_mix_write(sc, SBP_1335_MASTER_VOL, 0x04);
  		sbdsp_mix_write(sc, SBP_1335_MIDI_VOL,   0x06);
  		/* Check if we can read back the mixer values. */
  		if ((sbdsp_mix_read(sc, SBP_1335_MASTER_VOL) & 0x0e) == 0x04 &&
  		    (sbdsp_mix_read(sc, SBP_1335_MIDI_VOL)   & 0x0e) == 0x06)
  			sc->sc_mixer_model = SBM_CT1335;
  		else
  			sc->sc_mixer_model = SBM_NONE;
  		if (SBVER_MINOR(v) == 0)
  			sc->sc_model = SB_20;
  		else
  			sc->sc_model = SB_2x;
  		break;
  	case 3:
  		sc->sc_mixer_model = SBM_CT1345;
  		sc->sc_model = SB_PRO;
  		break;
  	case 4:
  #if 0
  /* XXX This does not work */
  		/* Most SB16 have a tone controls, but some don't. */
  		sbdsp_mix_write(sc, SB16P_TREBLE_L, 0x80);
  		/* Check if we can read back the mixer value. */
  		if ((sbdsp_mix_read(sc, SB16P_TREBLE_L) & 0xf0) == 0x80)
  			sc->sc_mixer_model = SBM_CT1745;
  		else
  			sc->sc_mixer_model = SBM_CT1XX5;
  #else
  		sc->sc_mixer_model = SBM_CT1745;
  #endif
  		/* XXX what about SB_32 */
  		if (SBVER_MINOR(v) == 16)
  			sc->sc_model = SB_64;
  		else
  			sc->sc_model = SB_16;
  		break;
  	}
  }
  
  /*
   * Halt a DMA in progress.
   */
  int
  sbdsp_haltdma(addr)
  	void *addr;
  {
  	struct sbdsp_softc *sc = addr;
  
  	DPRINTF(("sbdsp_haltdma: sc=%p\n", sc));
  
  	sbdsp_reset(sc);
  	return 0;
  }
  
  int
  sbdsp_set_timeconst(sc, tc)
  	struct sbdsp_softc *sc;
  	int tc;
  {
  	DPRINTF(("sbdsp_set_timeconst: sc=%p tc=%d\n", sc, tc));
  
  	if (sbdsp_wdsp(sc, SB_DSP_TIMECONST) < 0 ||
  	    sbdsp_wdsp(sc, tc) < 0)
  		return EIO;
  	    
  	return 0;
  }
  
  int
  sbdsp16_set_rate(sc, cmd, rate)
  	struct sbdsp_softc *sc;
  	int cmd, rate;
  {
  	DPRINTF(("sbdsp16_set_rate: sc=%p cmd=0x%02x rate=%d\n", sc, cmd, rate));
  
  	if (sbdsp_wdsp(sc, cmd) < 0 ||
  	    sbdsp_wdsp(sc, rate >> 8) < 0 ||
  	    sbdsp_wdsp(sc, rate) < 0)
  		return EIO;
  	return 0;
  }
  
  int
  sbdsp_dma_init_input(addr, buf, cc)
  	void *addr;
  	void *buf;
  	int cc;
  {
  	struct sbdsp_softc *sc = addr;
  
  	if (sc->sc_model == SB_1)
  		return 0;
  	sc->sc_i.run = SB_DMARUNNING;
  	DPRINTF(("sbdsp: dma start loop input addr=%p cc=%d chan=%d\n", 
  		 buf, cc, sc->sc_i.dmachan));
  	isa_dmastart(sc->sc_isa, sc->sc_i.dmachan, buf,
  		     cc, NULL, DMAMODE_READ | DMAMODE_LOOP, BUS_DMA_NOWAIT);
  	return 0;
  }
  
  static int
  sbdsp_dma_setup_input(sc)
  	struct sbdsp_softc *sc;
  {
  	int stereo = sc->sc_i.modep->channels == 2;
  	int filter;
  
  	/* Initialize the PCM */
  	if (ISSBPRO(sc)) {
  		if (sbdsp_wdsp(sc, sc->sc_i.modep->cmdchan) < 0)
  			return 0;
  		filter = stereo ? SBP_FILTER_OFF : sc->in_filter;
  		sbdsp_mix_write(sc, SBP_INFILTER,
  				(sbdsp_mix_read(sc, SBP_INFILTER) &
  				 ~SBP_IFILTER_MASK) | filter);
  	}
  	
  	if (ISSB16CLASS(sc)) {
  		if (sbdsp16_set_rate(sc, SB_DSP16_INPUTRATE, 
  				     sc->sc_i.rate)) {
  			DPRINTF(("sbdsp_dma_setup_input: rate=%d set failed\n",
  				 sc->sc_i.rate));
  			return 0;
  		}
  	} else {
  		if (sbdsp_set_timeconst(sc, sc->sc_i.tc)) {
  			DPRINTF(("sbdsp_dma_setup_input: tc=%d set failed\n",
  				 sc->sc_i.rate));
  			return 0;
  		}
  	}
  	return 1;
  }
  
  int
  sbdsp_dma_input(addr, p, cc, intr, arg)
  	void *addr;
  	void *p;
  	int cc;
  	void (*intr) __P((void *));
  	void *arg;
  {
  	struct sbdsp_softc *sc = addr;
  	
  #ifdef AUDIO_DEBUG
  	if (sbdspdebug > 1)
  		printf("sbdsp_dma_input: sc=%p buf=%p cc=%d intr=%p(%p)\n", 
  		       addr, p, cc, intr, arg);
  #endif
  #ifdef DIAGNOSTIC
  	if (sc->sc_i.modep->channels == 2 && (cc & 1)) {
  		DPRINTF(("stereo record odd bytes (%d)\n", cc));
  		return EIO;
  	}
  #endif
  
  	if (sc->sc_i.modep->precision == 8) {
  #ifdef DIAGNOSTIC
  		if (sc->sc_i.dmachan != sc->sc_drq8) {
  			printf("sbdsp_dma_input: prec=%d bad chan %d\n",
  			       sc->sc_i.modep->precision, sc->sc_i.dmachan);
  			return EIO;
  		}
  #endif
  		sc->sc_intr8 = intr;
  		sc->sc_arg8 = arg;
  	} else {
  #ifdef DIAGNOSTIC
  		if (sc->sc_i.dmachan != sc->sc_drq16) {
  			printf("sbdsp_dma_input: prec=%d bad chan %d\n",
  			       sc->sc_i.modep->precision, sc->sc_i.dmachan);
  			return EIO;
  		}
  #endif
  		sc->sc_intr16 = intr;
  		sc->sc_arg16 = arg;
  	}
  		
  	switch(sc->sc_i.run) {
  	case SB_NOTRUNNING:
  		/* Non-looping mode, not initialized */
  		sc->sc_i.run = SB_RUNNING;
  		if (!sbdsp_dma_setup_input(sc))
  			goto giveup;
  		/* fall into */
  	case SB_RUNNING:
  		/* Non-looping mode, start DMA */
  #ifdef AUDIO_DEBUG
  		if (sbdspdebug > 2)
  			printf("sbdsp_dma_input: dmastart buf=%p cc=%d chan=%d\n", 
  			       p, cc, sc->sc_i.dmachan);
  #endif
  		isa_dmastart(sc->sc_isa, sc->sc_i.dmachan, p,
  			     cc, NULL, DMAMODE_READ, BUS_DMA_NOWAIT);
  
  		/* Start PCM in non-looping mode */
  		if ((sc->sc_model == SB_JAZZ && sc->sc_i.dmachan > 3) ||
  		    (sc->sc_model != SB_JAZZ && sc->sc_i.modep->precision == 16))
  			cc >>= 1;
  		--cc;
  		if (sbdsp_wdsp(sc, sc->sc_i.modep->cmd) < 0 ||
  		    sbdsp_wdsp(sc, cc) < 0 ||
  		    sbdsp_wdsp(sc, cc >> 8) < 0) {
  			DPRINTF(("sbdsp_dma_input: SB1 DMA start failed\n"));
  			goto giveup;
  		}
  		break;
  	case SB_DMARUNNING:
  		/* Looping mode, not initialized */
  		sc->sc_i.run = SB_PCMRUNNING;
  		if (!sbdsp_dma_setup_input(sc))
  			goto giveup;
  		if ((sc->sc_model == SB_JAZZ && sc->sc_i.dmachan > 3) ||
  		    (sc->sc_model != SB_JAZZ && sc->sc_i.modep->precision == 16))
  			cc >>= 1;
  		--cc;
  		/* Initialize looping PCM */
  		if (ISSB16CLASS(sc)) {
  #ifdef AUDIO_DEBUG
  			if (sbdspdebug > 2)
  				printf("sbdsp16 input command cmd=0x%02x bmode=0x%02x cc=%d\n",
  				       sc->sc_i.modep->cmd, sc->sc_i.bmode, cc);
  #endif
  			if (sbdsp_wdsp(sc, sc->sc_i.modep->cmd) < 0 || 
  			    sbdsp_wdsp(sc, sc->sc_i.bmode) < 0 ||
  			    sbdsp_wdsp(sc, cc) < 0 ||
  			    sbdsp_wdsp(sc, cc >> 8) < 0) {
  				DPRINTF(("sbdsp_dma_input: SB16 DMA start failed\n"));
  				DPRINTF(("sbdsp16 input command cmd=0x%02x bmode=0x%02x cc=%d\n",
  					 sc->sc_i.modep->cmd, sc->sc_i.bmode, cc));
  				goto giveup;
  			}
  		} else {
  			DPRINTF(("sbdsp_dma_input: set blocksize=%d\n", cc));
  			if (sbdsp_wdsp(sc, SB_DSP_BLOCKSIZE) < 0 ||
  			    sbdsp_wdsp(sc, cc) < 0 ||
  			    sbdsp_wdsp(sc, cc >> 8) < 0) {
  				DPRINTF(("sbdsp_dma_input: SB2 DMA blocksize failed\n"));
  				goto giveup;
  			}
  			if (sbdsp_wdsp(sc, sc->sc_i.modep->cmd) < 0) {
  				DPRINTF(("sbdsp_dma_input: SB2 DMA start failed\n"));
  				goto giveup;
  			}
  		}
  		break;
  	case SB_PCMRUNNING:
  		/* Looping mode, nothing to do */
  		break;
  	}
  	return 0;
  
  giveup:
  	sbdsp_reset(sc);
  	return EIO;
  }
  
  int
  sbdsp_dma_init_output(addr, buf, cc)
  	void *addr;
  	void *buf;
  	int cc;
  {
  	struct sbdsp_softc *sc = addr;
  
  	if (sc->sc_model == SB_1)
  		return 0;
  	sc->sc_o.run = SB_DMARUNNING;
  	DPRINTF(("sbdsp: dma start loop output buf=%p cc=%d chan=%d\n",
  		 buf, cc, sc->sc_o.dmachan));
  	isa_dmastart(sc->sc_isa, sc->sc_o.dmachan, buf,
  		     cc, NULL, DMAMODE_WRITE | DMAMODE_LOOP, BUS_DMA_NOWAIT);
  	return 0;
  }
  
  static int
  sbdsp_dma_setup_output(sc)
  	struct sbdsp_softc *sc;
  {
  	int stereo = sc->sc_o.modep->channels == 2;
  	int cmd;
  
  	if (ISSBPRO(sc)) {
  		/* make sure we re-set stereo mixer bit when we start output. */
  		sbdsp_mix_write(sc, SBP_STEREO,
  				(sbdsp_mix_read(sc, SBP_STEREO) & ~SBP_PLAYMODE_MASK) |
  				(stereo ?  SBP_PLAYMODE_STEREO : SBP_PLAYMODE_MONO));
  		cmd = sc->sc_o.modep->cmdchan;
  		if (cmd && sbdsp_wdsp(sc, cmd) < 0)
  			return 0;
  	}
  	
  	if (ISSB16CLASS(sc)) {
  		if (sbdsp16_set_rate(sc, SB_DSP16_OUTPUTRATE,
  				     sc->sc_o.rate)) {
  			DPRINTF(("sbdsp_dma_setup_output: rate=%d set failed\n",
  				 sc->sc_o.rate));
  			return 0;
  		}
  	} else {
  		if (sbdsp_set_timeconst(sc, sc->sc_o.tc)) {
  			DPRINTF(("sbdsp_dma_setup_output: tc=%d set failed\n",
  				 sc->sc_o.rate));
  			return 0;
  		}
  	}
  	return 1;
  }
  
  int
  sbdsp_dma_output(addr, p, cc, intr, arg)
  	void *addr;
  	void *p;
  	int cc;
  	void (*intr) __P((void *));
  	void *arg;
  {
  	struct sbdsp_softc *sc = addr;
  	
  #ifdef AUDIO_DEBUG
  	if (sbdspdebug > 1)
  		printf("sbdsp_dma_output: sc=%p buf=%p cc=%d intr=%p(%p)\n", addr, p, cc, intr, arg);
  #endif
  #ifdef DIAGNOSTIC
  	if (sc->sc_o.modep->channels == 2 && (cc & 1)) {
  		DPRINTF(("stereo playback odd bytes (%d)\n", cc));
  		return EIO;
  	}
  #endif
  
  	if (sc->sc_o.modep->precision == 8) {
  #ifdef DIAGNOSTIC
  		if (sc->sc_o.dmachan != sc->sc_drq8) {
  			printf("sbdsp_dma_output: prec=%d bad chan %d\n",
  			       sc->sc_o.modep->precision, sc->sc_o.dmachan);
  			return EIO;
  		}
  #endif
  		sc->sc_intr8 = intr;
  		sc->sc_arg8 = arg;
  	} else {
  #ifdef DIAGNOSTIC
  		if (sc->sc_o.dmachan != sc->sc_drq16) {
  			printf("sbdsp_dma_output: prec=%d bad chan %d\n",
  			       sc->sc_o.modep->precision, sc->sc_o.dmachan);
  			return EIO;
  		}
  #endif
  		sc->sc_intr16 = intr;
  		sc->sc_arg16 = arg;
  	}
  
  	switch(sc->sc_o.run) {
  	case SB_NOTRUNNING:
  		/* Non-looping mode, not initialized */
  		sc->sc_o.run = SB_RUNNING;
  		if (!sbdsp_dma_setup_output(sc))
  			goto giveup;
  		/* fall into */
  	case SB_RUNNING:
  		/* Non-looping mode, initialized. Start DMA and PCM */
  #ifdef AUDIO_DEBUG
  		if (sbdspdebug > 2)
  			printf("sbdsp: start dma out addr=%p, cc=%d, chan=%d\n",
  			       p, cc, sc->sc_o.dmachan);
  #endif
  		isa_dmastart(sc->sc_isa, sc->sc_o.dmachan, p,
  			     cc, NULL, DMAMODE_WRITE, BUS_DMA_NOWAIT);
  		if ((sc->sc_model == SB_JAZZ && sc->sc_o.dmachan > 3) ||
  		    (sc->sc_model != SB_JAZZ && sc->sc_o.modep->precision == 16))
  			cc >>= 1;
  		--cc;
  		if (sbdsp_wdsp(sc, sc->sc_o.modep->cmd) < 0 ||
  		    sbdsp_wdsp(sc, cc) < 0 ||
  		    sbdsp_wdsp(sc, cc >> 8) < 0) {
  			DPRINTF(("sbdsp_dma_output: SB1 DMA start failed\n"));
  			goto giveup;
  		}
  		break;
  	case SB_DMARUNNING:
  		/* Looping mode, not initialized */
  		sc->sc_o.run = SB_PCMRUNNING;
  		if (!sbdsp_dma_setup_output(sc))
  			goto giveup;
  		if ((sc->sc_model == SB_JAZZ && sc->sc_o.dmachan > 3) ||
  		    (sc->sc_model != SB_JAZZ && sc->sc_o.modep->precision == 16))
  			cc >>= 1;
  		--cc;
  		/* Initialize looping PCM */
  		if (ISSB16CLASS(sc)) {
  			DPRINTF(("sbdsp_dma_output: SB16 cmd=0x%02x bmode=0x%02x cc=%d\n", 
  				 sc->sc_o.modep->cmd,sc->sc_o.bmode, cc));
  			if (sbdsp_wdsp(sc, sc->sc_o.modep->cmd) < 0 || 
  			    sbdsp_wdsp(sc, sc->sc_o.bmode) < 0 ||
  			    sbdsp_wdsp(sc, cc) < 0 ||
  			    sbdsp_wdsp(sc, cc >> 8) < 0) {
  				DPRINTF(("sbdsp_dma_output: SB16 DMA start failed\n"));
  				goto giveup;
  			}
  		} else {
  			DPRINTF(("sbdsp_dma_output: set blocksize=%d\n", cc));
  			if (sbdsp_wdsp(sc, SB_DSP_BLOCKSIZE) < 0 ||
  			    sbdsp_wdsp(sc, cc) < 0 ||
  			    sbdsp_wdsp(sc, cc >> 8) < 0) {
  				DPRINTF(("sbdsp_dma_output: SB2 DMA blocksize failed\n"));
  				goto giveup;
  			}
  			if (sbdsp_wdsp(sc, sc->sc_o.modep->cmd) < 0) {
  				DPRINTF(("sbdsp_dma_output: SB2 DMA start failed\n"));
  				goto giveup;
  			}
  		}
  		break;
  	case SB_PCMRUNNING:
  		/* Looping mode, nothing to do */
  		break;
  	}
  	return 0;
  
  giveup:
  	sbdsp_reset(sc);
  	return EIO;
  }
  
  /*
   * Only the DSP unit on the sound blaster generates interrupts.
   * There are three cases of interrupt: reception of a midi byte
   * (when mode is enabled), completion of dma transmission, or 
   * completion of a dma reception.
   *
   * If there is interrupt sharing or a spurious interrupt occurs
   * there is no way to distinguish this on an SB2.  So if you have
   * an SB2 and experience problems, buy an SB16 (it's only $40).
   */
  int
  sbdsp_intr(arg)
  	void *arg;
  {
  	struct sbdsp_softc *sc = arg;
  	int loop = sc->sc_model != SB_1;
  	u_char irq;
  
  #ifdef AUDIO_DEBUG
  	if (sbdspdebug > 1)
  		printf("sbdsp_intr: intr8=%p, intr16=%p\n",
  		       sc->sc_intr8, sc->sc_intr16);
  #endif
  	if (ISSB16CLASS(sc)) {
  		irq = sbdsp_mix_read(sc, SBP_IRQ_STATUS);
  		if ((irq & (SBP_IRQ_DMA8 | SBP_IRQ_DMA16)) == 0) {
  			DPRINTF(("sbdsp_intr: Spurious interrupt 0x%x\n", irq));
  			return 0;
  		}
  	} else {
  		if (!loop && !isa_dmafinished(sc->sc_isa, sc->sc_drq8))
  			return 0;
  		irq = SBP_IRQ_DMA8;
  	}
  	sc->sc_interrupts++;
  	delay(10);		/* XXX why? */
  #if 0
  	if (sc->sc_mintr != 0) {
  		x = sbdsp_rdsp(sc);
  		(*sc->sc_mintr)(sc->sc_arg, x);
  	} else
  #endif
  	if (sc->sc_intr8 == 0 && sc->sc_intr16 == 0) {
  		DPRINTF(("sbdsp_intr: Unexpected interrupt 0x%x\n", irq));
  		/* XXX return 0;*/	/* Did not expect an interrupt */
  	}
  
  	/* clear interrupt */
  	if (irq & SBP_IRQ_DMA8) {
  		bus_space_read_1(sc->sc_iot, sc->sc_ioh, SBP_DSP_IRQACK8);
  		if (!loop)
  			isa_dmadone(sc->sc_isa, sc->sc_drq8);
  		if (sc->sc_intr8)
  			(*sc->sc_intr8)(sc->sc_arg8);
  	}
  	if (irq & SBP_IRQ_DMA16) {
  		bus_space_read_1(sc->sc_iot, sc->sc_ioh, SBP_DSP_IRQACK16);
  		if (sc->sc_intr16)
  			(*sc->sc_intr16)(sc->sc_arg16);
  	}
  	return 1;
  }
  
  #if 0
  /*
   * Enter midi uart mode and arrange for read interrupts
   * to vector to `intr'.  This puts the card in a mode
   * which allows only midi I/O; the card must be reset
   * to leave this mode.  Unfortunately, the card does not
   * use transmit interrupts, so bytes must be output
   * using polling.  To keep the polling overhead to a
   * minimum, output should be driven off a timer.
   * This is a little tricky since only 320us separate
   * consecutive midi bytes.
   */
  void
  sbdsp_set_midi_mode(sc, intr, arg)
  	struct sbdsp_softc *sc;
  	void (*intr)();
  	void *arg;
  {
  
  	sbdsp_wdsp(sc, SB_MIDI_UART_INTR);
  	sc->sc_mintr = intr;
  	sc->sc_intr = 0;
  	sc->sc_arg = arg;
  }
  
  /*
   * Write a byte to the midi port, when in midi uart mode.
   */
  void
  sbdsp_midi_output(sc, v)
  	struct sbdsp_softc *sc;
  	int v;
  {
  
  	if (sbdsp_wdsp(sc, v) < 0)
  		++sberr.wmidi;
  }
  #endif
  
  /* Mask a value 0-255, but round it first */
  #define MAXVAL 256
  static int
  sbdsp_adjust(val, mask)
  	int val, mask;
  {
  	val += (MAXVAL - mask) >> 1;
  	if (val >= MAXVAL)
  		val = MAXVAL-1;
  	return val & mask;
  }
  
  void
  sbdsp_set_mixer_gain(sc, port)
  	struct sbdsp_softc *sc;
  	int port;
  {
  	int src, gain;
  
  	switch(sc->sc_mixer_model) {
  	case SBM_NONE:
  		return;
  	case SBM_CT1335:
  		gain = SB_1335_GAIN(sc->gain[port][SB_LEFT]);
  		switch(port) {
  		case SB_MASTER_VOL:
  			src = SBP_1335_MASTER_VOL;
  			break;
  		case SB_MIDI_VOL:
  			src = SBP_1335_MIDI_VOL;
  			break;
  		case SB_CD_VOL:
  			src = SBP_1335_CD_VOL;
  			break;
  		case SB_VOICE_VOL:
  			src = SBP_1335_VOICE_VOL;
  			gain = SB_1335_MASTER_GAIN(sc->gain[port][SB_LEFT]);
  			break;
  		default:
  			return;
  		}
  		sbdsp_mix_write(sc, src, gain);
  		break;
  	case SBM_CT1345:
  		gain = SB_STEREO_GAIN(sc->gain[port][SB_LEFT],
  				      sc->gain[port][SB_RIGHT]);
  		switch (port) {
  		case SB_MIC_VOL:
  			src = SBP_MIC_VOL;
  #ifndef SHARK
  			gain = SB_MIC_GAIN(sc->gain[port][SB_LEFT]);
  #endif
  			break;
  		case SB_MASTER_VOL:
  			src = SBP_MASTER_VOL;
  			break;
  		case SB_LINE_IN_VOL:
  			src = SBP_LINE_VOL;
  			break;
  		case SB_VOICE_VOL:
  			src = SBP_VOICE_VOL;
  			break;
  		case SB_MIDI_VOL:
  			src = SBP_MIDI_VOL;
  			break;
  		case SB_CD_VOL:
  			src = SBP_CD_VOL;
  			break;
  		default:
  			return;
  		}
  		sbdsp_mix_write(sc, src, gain);
  		break;
  	case SBM_CT1XX5:
  	case SBM_CT1745:
  		switch (port) {
  		case SB_MIC_VOL:
  			src = SB16P_MIC_L;
  			break;
  		case SB_MASTER_VOL:
  			src = SB16P_MASTER_L;
  			break;
  		case SB_LINE_IN_VOL:
  			src = SB16P_LINE_L;
  			break;
  		case SB_VOICE_VOL:
  			src = SB16P_VOICE_L;
  			break;
  		case SB_MIDI_VOL:
  			src = SB16P_MIDI_L;
  			break;
  		case SB_CD_VOL:
  			src = SB16P_CD_L;
  			break;
  		case SB_INPUT_GAIN:
  			src = SB16P_INPUT_GAIN_L;
  			break;
  		case SB_OUTPUT_GAIN:
  			src = SB16P_OUTPUT_GAIN_L;
  			break;
  		case SB_TREBLE:
  			src = SB16P_TREBLE_L;
  			break;
  		case SB_BASS:
  			src = SB16P_BASS_L;
  			break;
  		case SB_PCSPEAKER:
  			sbdsp_mix_write(sc, SB16P_PCSPEAKER, sc->gain[port][SB_LEFT]);
  			return;
  		default:
  			return;
  		}
  		sbdsp_mix_write(sc, src, sc->gain[port][SB_LEFT]);
  		sbdsp_mix_write(sc, SB16P_L_TO_R(src), sc->gain[port][SB_RIGHT]);
  		break;
  	}
  }
  
  int
  sbdsp_mixer_set_port(addr, cp)
  	void *addr;
  	mixer_ctrl_t *cp;
  {
  	struct sbdsp_softc *sc = addr;
  	int lgain, rgain;
  	int mask, bits;
  	int lmask, rmask, lbits, rbits;
  	int mute, swap;
      
  	DPRINTF(("sbdsp_mixer_set_port: port=%d num_channels=%d\n", cp->dev,
  	    cp->un.value.num_channels));
  
  	if (sc->sc_mixer_model == SBM_NONE)
  		return EINVAL;
  
  	switch (cp->dev) {
  	case SB_TREBLE:
  	case SB_BASS:
  		if (sc->sc_mixer_model == SBM_CT1345 ||
                      sc->sc_mixer_model == SBM_CT1XX5) {
  			if (cp->type != AUDIO_MIXER_ENUM)
  				return EINVAL;
  			switch (cp->dev) {
  			case SB_TREBLE:
  				sbdsp_set_ifilter(addr, cp->un.ord ? SB_TREBLE : 0);
  				return 0;
  			case SB_BASS:
  				sbdsp_set_ifilter(addr, cp->un.ord ? SB_BASS : 0);
  				return 0;
  			}
  		}
  	case SB_PCSPEAKER:
  	case SB_INPUT_GAIN:
  	case SB_OUTPUT_GAIN:
  		if (!ISSBM1745(sc))
  			return EINVAL;
  	case SB_MIC_VOL:
  	case SB_LINE_IN_VOL:
  		if (sc->sc_mixer_model == SBM_CT1335)
  			return EINVAL;
  	case SB_VOICE_VOL:
  	case SB_MIDI_VOL:
  	case SB_CD_VOL:
  	case SB_MASTER_VOL:
  		if (cp->type != AUDIO_MIXER_VALUE)
  			return EINVAL;
  
  		/*
  		 * All the mixer ports are stereo except for the microphone.
  		 * If we get a single-channel gain value passed in, then we
  		 * duplicate it to both left and right channels.
  		 */
  
  		switch (cp->dev) {
  		case SB_MIC_VOL:
  			if (cp->un.value.num_channels != 1)
  				return EINVAL;
  
  #ifdef SHARK
  			lgain = rgain = cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] & 0xf0;
  #else
  			lgain = rgain = SB_ADJUST_MIC_GAIN(sc, 
  			  cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
  #endif
  			break;
  		case SB_PCSPEAKER:
  			if (cp->un.value.num_channels != 1)
  				return EINVAL;
  			/* fall into */
  		case SB_INPUT_GAIN:
  		case SB_OUTPUT_GAIN:
  			lgain = rgain = SB_ADJUST_2_GAIN(sc, 
  			  cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
  			break;
  #ifdef SHARK
  		case SB_VOICE_VOL:
  			/* Range for Audio 2 volume is 0..f */
  			switch (cp->un.value.num_channels) {
  			case 1:
  				lgain = rgain = cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] & 0xf0;
  				break;
  			case 2:
  				lgain = cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT] & 0xf0;
  				rgain = cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] & 0xf0;
  				break;
  			}
  			break;
  		case SB_MASTER_VOL:
  			/* Range for master volume is 0..f */
  			switch (cp->un.value.num_channels) {
  			case 1:
  				lgain = rgain = cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] & 0xf0;
  				break;
  			case 2:
  				lgain = cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT] & 0xf0;
  				rgain = cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] & 0xf0;
  				break;
  			}
  			break;
  #endif
  		default:
  			switch (cp->un.value.num_channels) {
  			case 1:
  				lgain = rgain = SB_ADJUST_GAIN(sc, 
  				  cp->un.value.level[AUDIO_MIXER_LEVEL_MONO]);
  				break;
  			case 2:
  				if (sc->sc_mixer_model == SBM_CT1335)
  					return EINVAL;
  				lgain = SB_ADJUST_GAIN(sc, 
  				  cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT]);
  				rgain = SB_ADJUST_GAIN(sc, 
  				  cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
  				break;
  			default:
  				return EINVAL;
  			}
  			break;
  		}
  		sc->gain[cp->dev][SB_LEFT]  = lgain;
  		sc->gain[cp->dev][SB_RIGHT] = rgain;
  
  		sbdsp_set_mixer_gain(sc, cp->dev);
  		break;
  
  	case SB_RECORD_SOURCE:
  		if (ISSBM1745(sc)) {
  			if (cp->type != AUDIO_MIXER_SET)
  				return EINVAL;
  			return sbdsp_set_in_ports(sc, cp->un.mask);
  		} else {
  			if (cp->type != AUDIO_MIXER_ENUM)
  				return EINVAL;
  			sc->in_port = cp->un.ord;
  			return sbdsp_set_in_ports(sc, 1 << cp->un.ord);
  		}
  		break;
  
  	case SB_AGC:
  		if (!ISSBM1745(sc) || cp->type != AUDIO_MIXER_ENUM)
  			return EINVAL;
  		sbdsp_mix_write(sc, SB16P_AGC, cp->un.ord & 1);
  		break;
  
  	case SB_CD_OUT_MUTE:
  		mask = SB16P_SW_CD;
  		goto omute;
  	case SB_MIC_OUT_MUTE:
  		mask = SB16P_SW_MIC;
  		goto omute;
  	case SB_LINE_OUT_MUTE:
  		mask = SB16P_SW_LINE;
  	omute:
  		if (cp->type != AUDIO_MIXER_ENUM)
  			return EINVAL;
  		bits = sbdsp_mix_read(sc, SB16P_OSWITCH);
  		sc->gain[cp->dev][SB_LR] = cp->un.ord != 0;
  		if (cp->un.ord)
  			bits = bits & ~mask;
  		else
  			bits = bits | mask;
  		sbdsp_mix_write(sc, SB16P_OSWITCH, bits);
  		break;
  
  	case SB_MIC_IN_MUTE:
  	case SB_MIC_SWAP:
  		lmask = rmask = SB16P_SW_MIC;
  		goto imute;
  	case SB_CD_IN_MUTE:
  	case SB_CD_SWAP:
  		lmask = SB16P_SW_CD_L;
  		rmask = SB16P_SW_CD_R;
  		goto imute;
  	case SB_LINE_IN_MUTE:
  	case SB_LINE_SWAP:
  		lmask = SB16P_SW_LINE_L;
  		rmask = SB16P_SW_LINE_R;
  		goto imute;
  	case SB_MIDI_IN_MUTE:
  	case SB_MIDI_SWAP:
  		lmask = SB16P_SW_MIDI_L;
  		rmask = SB16P_SW_MIDI_R;
  	imute:
  		if (cp->type != AUDIO_MIXER_ENUM)
  			return EINVAL;
  		mask = lmask | rmask;
  		lbits = sbdsp_mix_read(sc, SB16P_ISWITCH_L) & ~mask;
  		rbits = sbdsp_mix_read(sc, SB16P_ISWITCH_R) & ~mask;
  		sc->gain[cp->dev][SB_LR] = cp->un.ord != 0;
  		if (SB_IS_IN_MUTE(cp->dev)) {
  			mute = cp->dev;
  			swap = mute - SB_CD_IN_MUTE + SB_CD_SWAP;
  		} else {
  			swap = cp->dev;
  			mute = swap + SB_CD_IN_MUTE - SB_CD_SWAP;
  		}
  		if (sc->gain[swap][SB_LR]) {
  			mask = lmask;
  			lmask = rmask;
  			rmask = mask;
  		}
  		if (!sc->gain[mute][SB_LR]) {
  			lbits = lbits | lmask;
  			rbits = rbits | rmask;
  		}
  		sbdsp_mix_write(sc, SB16P_ISWITCH_L, lbits);
  		sbdsp_mix_write(sc, SB16P_ISWITCH_L, rbits);
  		break;
  
  	default:
  		return EINVAL;
  	}
  
  	return 0;
  }
  
  int
  sbdsp_mixer_get_port(addr, cp)
  	void *addr;
  	mixer_ctrl_t *cp;
  {
  	struct sbdsp_softc *sc = addr;
      
  	DPRINTF(("sbdsp_mixer_get_port: port=%d\n", cp->dev));
  
  	if (sc->sc_mixer_model == SBM_NONE)
  		return EINVAL;
  
  	switch (cp->dev) {
  	case SB_TREBLE:
  	case SB_BASS:
  		if (sc->sc_mixer_model == SBM_CT1345 ||
                      sc->sc_mixer_model == SBM_CT1XX5) {
  			switch (cp->dev) {
  			case SB_TREBLE:
  				cp->un.ord = sbdsp_get_ifilter(addr) == SB_TREBLE;
  				return 0;
  			case SB_BASS:
  				cp->un.ord = sbdsp_get_ifilter(addr) == SB_BASS;
  				return 0;
  			}
  		}
  	case SB_PCSPEAKER:
  	case SB_INPUT_GAIN:
  	case SB_OUTPUT_GAIN:
  		if (!ISSBM1745(sc))
  			return EINVAL;
  	case SB_MIC_VOL:
  	case SB_LINE_IN_VOL:
  		if (sc->sc_mixer_model == SBM_CT1335)
  			return EINVAL;
  	case SB_VOICE_VOL:
  	case SB_MIDI_VOL:
  	case SB_CD_VOL:
  	case SB_MASTER_VOL:
  		switch (cp->dev) {
  		case SB_MIC_VOL:
  		case SB_PCSPEAKER:
  			if (cp->un.value.num_channels != 1)
  				return EINVAL;
  			/* fall into */
  		default:
  			switch (cp->un.value.num_channels) {
  			case 1:
  				cp->un.value.level[AUDIO_MIXER_LEVEL_MONO] = 
  					sc->gain[cp->dev][SB_LEFT];
  				break;
  			case 2:
  				cp->un.value.level[AUDIO_MIXER_LEVEL_LEFT] = 
  					sc->gain[cp->dev][SB_LEFT];
  				cp->un.value.level[AUDIO_MIXER_LEVEL_RIGHT] = 
  					sc->gain[cp->dev][SB_RIGHT];
  				break;
  			default:
  				return EINVAL;
  			}
  			break;
  		}
  		break;
  
  	case SB_RECORD_SOURCE:
  		if (ISSBM1745(sc))
  			cp->un.mask = sc->in_mask;
  		else
  			cp->un.ord = sc->in_port;
  		break;
  
  	case SB_AGC:
  		if (!ISSBM1745(sc))
  			return EINVAL;
  		cp->un.ord = sbdsp_mix_read(sc, SB16P_AGC);
  		break;
  
  	case SB_CD_IN_MUTE:
  	case SB_MIC_IN_MUTE:
  	case SB_LINE_IN_MUTE:
  	case SB_MIDI_IN_MUTE:
  	case SB_CD_SWAP:
  	case SB_MIC_SWAP:
  	case SB_LINE_SWAP:
  	case SB_MIDI_SWAP:
  	case SB_CD_OUT_MUTE:
  	case SB_MIC_OUT_MUTE:
  	case SB_LINE_OUT_MUTE:
  		cp->un.ord = sc->gain[cp->dev][SB_LR];
  		break;
  
  	default:
  		return EINVAL;
  	}
  
  	return 0;
  }
  
  int
  sbdsp_mixer_query_devinfo(addr, dip)
  	void *addr;
  	mixer_devinfo_t *dip;
  {
  	struct sbdsp_softc *sc = addr;
  	int chan, class, is1745;
  
  	DPRINTF(("sbdsp_mixer_query_devinfo: model=%d index=%d\n", 
  		 sc->sc_mixer_model, dip->index));
  
  	if (sc->sc_mixer_model == SBM_NONE)
  		return ENXIO;
  
  	chan = sc->sc_mixer_model == SBM_CT1335 ? 1 : 2;
  	is1745 = ISSBM1745(sc);
  	class = is1745 ? SB_INPUT_CLASS : SB_OUTPUT_CLASS;
  
  	switch (dip->index) {
  	case SB_MASTER_VOL:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = SB_OUTPUT_CLASS;
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNmaster);
  		dip->un.v.num_channels = chan;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  	case SB_MIDI_VOL:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = class;
  		dip->prev = AUDIO_MIXER_LAST;
  		dip->next = is1745 ? SB_MIDI_IN_MUTE : AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNfmsynth);
  		dip->un.v.num_channels = chan;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  	case SB_CD_VOL:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = class;
  		dip->prev = AUDIO_MIXER_LAST;
  		dip->next = is1745 ? SB_CD_IN_MUTE : AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNcd);
  		dip->un.v.num_channels = chan;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  	case SB_VOICE_VOL:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = class;
  		dip->prev = AUDIO_MIXER_LAST;
  		dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNdac);
  		dip->un.v.num_channels = chan;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  	case SB_OUTPUT_CLASS:
  		dip->type = AUDIO_MIXER_CLASS;
  		dip->mixer_class = SB_OUTPUT_CLASS;
  		dip->next = dip->prev = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioCoutputs);
  		return 0;
  	}
  
  	if (sc->sc_mixer_model == SBM_CT1335)
  		return ENXIO;
  
  	switch (dip->index) {
  	case SB_MIC_VOL:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = class;
  		dip->prev = AUDIO_MIXER_LAST;
  		dip->next = is1745 ? SB_MIC_IN_MUTE : AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNmicrophone);
  		dip->un.v.num_channels = 1;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  
  	case SB_LINE_IN_VOL:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = class;
  		dip->prev = AUDIO_MIXER_LAST;
  		dip->next = is1745 ? SB_LINE_IN_MUTE : AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNline);
  		dip->un.v.num_channels = 2;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  
  	case SB_RECORD_SOURCE:
  		dip->mixer_class = SB_RECORD_CLASS;
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNsource);
  		if (ISSBM1745(sc)) {
  			dip->type = AUDIO_MIXER_SET;
  			dip->un.s.num_mem = 4;
  			strcpy(dip->un.s.member[0].label.name, AudioNmicrophone);
  			dip->un.s.member[0].mask = 1 << SB_MIC_VOL;
  			strcpy(dip->un.s.member[1].label.name, AudioNcd);
  			dip->un.s.member[1].mask = 1 << SB_CD_VOL;
  			strcpy(dip->un.s.member[2].label.name, AudioNline);
  			dip->un.s.member[2].mask = 1 << SB_LINE_IN_VOL;
  			strcpy(dip->un.s.member[3].label.name, AudioNfmsynth);
  			dip->un.s.member[3].mask = 1 << SB_MIDI_VOL;
  		} else {
  			dip->type = AUDIO_MIXER_ENUM;
  			dip->un.e.num_mem = 3;
  			strcpy(dip->un.e.member[0].label.name, AudioNmicrophone);
  			dip->un.e.member[0].ord = SB_MIC_VOL;
  			strcpy(dip->un.e.member[1].label.name, AudioNcd);
  			dip->un.e.member[1].ord = SB_CD_VOL;
  			strcpy(dip->un.e.member[2].label.name, AudioNline);
  			dip->un.e.member[2].ord = SB_LINE_IN_VOL;
  		}
  		return 0;
  
  	case SB_BASS:
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNbass);
  		if (sc->sc_mixer_model == SBM_CT1745) {
  			dip->type = AUDIO_MIXER_VALUE;
  			dip->mixer_class = SB_EQUALIZATION_CLASS;
  			dip->un.v.num_channels = 2;
  			strcpy(dip->un.v.units.name, AudioNbass);
  		} else {
  			dip->type = AUDIO_MIXER_ENUM;
  			dip->mixer_class = SB_INPUT_CLASS;
  			dip->un.e.num_mem = 2;
  			strcpy(dip->un.e.member[0].label.name, AudioNoff);
  			dip->un.e.member[0].ord = 0;
  			strcpy(dip->un.e.member[1].label.name, AudioNon);
  			dip->un.e.member[1].ord = 1;
  		}
  		return 0;
  		
  	case SB_TREBLE:
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNtreble);
  		if (sc->sc_mixer_model == SBM_CT1745) {
  			dip->type = AUDIO_MIXER_VALUE;
  			dip->mixer_class = SB_EQUALIZATION_CLASS;
  			dip->un.v.num_channels = 2;
  			strcpy(dip->un.v.units.name, AudioNtreble);
  		} else {
  			dip->type = AUDIO_MIXER_ENUM;
  			dip->mixer_class = SB_INPUT_CLASS;
  			dip->un.e.num_mem = 2;
  			strcpy(dip->un.e.member[0].label.name, AudioNoff);
  			dip->un.e.member[0].ord = 0;
  			strcpy(dip->un.e.member[1].label.name, AudioNon);
  			dip->un.e.member[1].ord = 1;
  		}
  		return 0;
  		
  	case SB_RECORD_CLASS:			/* record source class */
  		dip->type = AUDIO_MIXER_CLASS;
  		dip->mixer_class = SB_RECORD_CLASS;
  		dip->next = dip->prev = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioCrecord);
  		return 0;
  
  	case SB_INPUT_CLASS:
  		dip->type = AUDIO_MIXER_CLASS;
  		dip->mixer_class = SB_INPUT_CLASS;
  		dip->next = dip->prev = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioCinputs);
  		return 0;
  
  	}
  
  	if (sc->sc_mixer_model == SBM_CT1345)
  		return ENXIO;
  
  	switch(dip->index) {
  	case SB_PCSPEAKER:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = SB_INPUT_CLASS;
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, "pc_speaker");
  		dip->un.v.num_channels = 1;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  
  	case SB_INPUT_GAIN:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = SB_INPUT_CLASS;
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNinput);
  		dip->un.v.num_channels = 2;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  
  	case SB_OUTPUT_GAIN:
  		dip->type = AUDIO_MIXER_VALUE;
  		dip->mixer_class = SB_OUTPUT_CLASS;
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioNoutput);
  		dip->un.v.num_channels = 2;
  		strcpy(dip->un.v.units.name, AudioNvolume);
  		return 0;
  
  	case SB_AGC:
  		dip->type = AUDIO_MIXER_ENUM;
  		dip->mixer_class = SB_INPUT_CLASS;
  		dip->prev = dip->next = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, "AGC");
  		dip->un.e.num_mem = 2;
  		strcpy(dip->un.e.member[0].label.name, AudioNoff);
  		dip->un.e.member[0].ord = 0;
  		strcpy(dip->un.e.member[1].label.name, AudioNon);
  		dip->un.e.member[1].ord = 1;
  		return 0;
  
  	case SB_EQUALIZATION_CLASS:
  		dip->type = AUDIO_MIXER_CLASS;
  		dip->mixer_class = SB_EQUALIZATION_CLASS;
  		dip->next = dip->prev = AUDIO_MIXER_LAST;
  		strcpy(dip->label.name, AudioCequalization);
  		return 0;
  
  	case SB_CD_IN_MUTE:
  		dip->prev = SB_CD_VOL;
  		dip->next = SB_CD_SWAP;
  		dip->mixer_class = SB_INPUT_CLASS;
  		goto mute;
  
  	case SB_MIC_IN_MUTE:
  		dip->prev = SB_MIC_VOL;
  		dip->next = SB_MIC_SWAP;
  		dip->mixer_class = SB_INPUT_CLASS;
  		goto mute;
  
  	case SB_LINE_IN_MUTE:
  		dip->prev = SB_LINE_IN_VOL;
  		dip->next = SB_LINE_SWAP;
  		dip->mixer_class = SB_INPUT_CLASS;
  		goto mute;
  
  	case SB_MIDI_IN_MUTE:
  		dip->prev = SB_MIDI_VOL;
  		dip->next = SB_MIDI_SWAP;
  		dip->mixer_class = SB_INPUT_CLASS;
  		goto mute;
  
  	case SB_CD_SWAP:
  		dip->prev = SB_CD_IN_MUTE;
  		dip->next = SB_CD_OUT_MUTE;
  		goto swap;
  
  	case SB_MIC_SWAP:
  		dip->prev = SB_MIC_IN_MUTE;
  		dip->next = SB_MIC_OUT_MUTE;
  		goto swap;
  
  	case SB_LINE_SWAP:
  		dip->prev = SB_LINE_IN_MUTE;
  		dip->next = SB_LINE_OUT_MUTE;
  		goto swap;
  
  	case SB_MIDI_SWAP:
  		dip->prev = SB_MIDI_IN_MUTE;
  		dip->next = AUDIO_MIXER_LAST;
  	swap:
  		dip->mixer_class = SB_INPUT_CLASS;
  		strcpy(dip->label.name, AudioNswap);
  		goto mute1;
  
  	case SB_CD_OUT_MUTE:
  		dip->prev = SB_CD_SWAP;
  		dip->next = AUDIO_MIXER_LAST;
  		dip->mixer_class = SB_OUTPUT_CLASS;
  		goto mute;
  
  	case SB_MIC_OUT_MUTE:
  		dip->prev = SB_MIC_SWAP;
  		dip->next = AUDIO_MIXER_LAST;
  		dip->mixer_class = SB_OUTPUT_CLASS;
  		goto mute;
  
  	case SB_LINE_OUT_MUTE:
  		dip->prev = SB_LINE_SWAP;
  		dip->next = AUDIO_MIXER_LAST;
  		dip->mixer_class = SB_OUTPUT_CLASS;
  	mute:
  		strcpy(dip->label.name, AudioNmute);
  	mute1:
  		dip->type = AUDIO_MIXER_ENUM;
  		dip->un.e.num_mem = 2;
  		strcpy(dip->un.e.member[0].label.name, AudioNoff);
  		dip->un.e.member[0].ord = 0;
  		strcpy(dip->un.e.member[1].label.name, AudioNon);
  		dip->un.e.member[1].ord = 1;
  		return 0;
  
  	}
  
  	return ENXIO;
  }
  
  void *
  sb_malloc(addr, size, pool, flags)
  	void *addr;
  	unsigned long size;
  	int pool;
  	int flags;
  {
  	struct sbdsp_softc *sc = addr;
  
  	return isa_malloc(sc->sc_isa, 4, size, pool, flags);
  }
  
  void
  sb_free(addr, ptr, pool)
  	void *addr;
  	void *ptr;
  	int pool;
  {
  	isa_free(ptr, pool);
  }
  
  unsigned long
  sb_round(addr, size)
  	void *addr;
  	unsigned long size;
  {
  	if (size > MAX_ISADMA)
  		size = MAX_ISADMA;
  	return size;
  }
  
  int
  sb_mappage(addr, mem, off, prot)
  	void *addr;
          void *mem;
          int off;
  	int prot;
  {
  	return isa_mappage(mem, off, prot);
  }
  
  int
  sbdsp_get_props(addr)
  	void *addr;
  {
  	struct sbdsp_softc *sc = addr;
  	return AUDIO_PROP_MMAP | 
  	       (sc->sc_fullduplex ? AUDIO_PROP_FULLDUPLEX : 0);
  }
  