sb8.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 1999 Cameron Grant <cg@freebsd.org>
 * Copyright (c) 1997,1998 Luigi Rizzo
 *
 * Derived from files in the Voxware 3.5 distribution,
 * Copyright by Hannu Savolainen 1994, under the same copyright
 * conditions.
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 */
 
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
 
#include <dev/sound/pcm/sound.h>
 
#include  <dev/sound/isa/sb.h>
#include  <dev/sound/chip.h>
 
#include <isa/isavar.h>
 
#include "mixer_if.h"
 
SND_DECLARE_FILE("$FreeBSD$");
 
#define SB_DEFAULT_BUFSZ        4096
 
static u_int32_t sb_fmt[] = {
        SND_FORMAT(AFMT_U8, 1, 0),
        0
};
static struct pcmchan_caps sb200_playcaps = {4000, 23000, sb_fmt, 0};
static struct pcmchan_caps sb200_reccaps = {4000, 13000, sb_fmt, 0};
static struct pcmchan_caps sb201_playcaps = {4000, 44100, sb_fmt, 0};
static struct pcmchan_caps sb201_reccaps = {4000, 15000, sb_fmt, 0};
 
static u_int32_t sbpro_fmt[] = {
        SND_FORMAT(AFMT_U8, 1, 0),
        SND_FORMAT(AFMT_U8, 2, 0),
        0
};
static struct pcmchan_caps sbpro_playcaps = {4000, 44100, sbpro_fmt, 0};
static struct pcmchan_caps sbpro_reccaps = {4000, 44100, sbpro_fmt, 0};
 
struct sb_info;
 
struct sb_chinfo {
        struct sb_info *parent;
        struct pcm_channel *channel;
        struct snd_dbuf *buffer;
        int dir;
        u_int32_t fmt, spd, blksz;
};
 
struct sb_info {
        device_t parent_dev;
        struct resource *io_base;       /* I/O address for the board */
        struct resource *irq;
        struct resource *drq;
        void *ih;
        bus_dma_tag_t parent_dmat;
 
        unsigned int bufsize;
        int bd_id;
        u_long bd_flags;       /* board-specific flags */
        struct sb_chinfo pch, rch;
};
 
static int sb_rd(struct sb_info *sb, int reg);
static void sb_wr(struct sb_info *sb, int reg, u_int8_t val);
static int sb_dspready(struct sb_info *sb);
static int sb_cmd(struct sb_info *sb, u_char val);
static int sb_cmd1(struct sb_info *sb, u_char cmd, int val);
static int sb_cmd2(struct sb_info *sb, u_char cmd, int val);
static u_int sb_get_byte(struct sb_info *sb);
static void sb_setmixer(struct sb_info *sb, u_int port, u_int value);
static int sb_getmixer(struct sb_info *sb, u_int port);
static int sb_reset_dsp(struct sb_info *sb);
 
static void sb_intr(void *arg);
static int sb_speed(struct sb_chinfo *ch);
static int sb_start(struct sb_chinfo *ch);
static int sb_stop(struct sb_chinfo *ch);
 
/*
 * Common code for the midi and pcm functions
 *
 * sb_cmd write a single byte to the CMD port.
 * sb_cmd1 write a CMD + 1 byte arg
 * sb_cmd2 write a CMD + 2 byte arg
 * sb_get_byte returns a single byte from the DSP data port
 */
 
static void
sb_lock(struct sb_info *sb) {
        sbc_lock(device_get_softc(sb->parent_dev));
}
 
static void
sb_unlock(struct sb_info *sb) {
        sbc_unlock(device_get_softc(sb->parent_dev));
}
 
static int
port_rd(struct resource *port, int off)
{
        return bus_space_read_1(rman_get_bustag(port), rman_get_bushandle(port), off);
}
 
static void
port_wr(struct resource *port, int off, u_int8_t data)
{
        bus_space_write_1(rman_get_bustag(port), rman_get_bushandle(port), off, data);
}
 
static int
sb_rd(struct sb_info *sb, int reg)
{
        return port_rd(sb->io_base, reg);
}
 
static void
sb_wr(struct sb_info *sb, int reg, u_int8_t val)
{
        port_wr(sb->io_base, reg, val);
}
 
static int
sb_dspready(struct sb_info *sb)
{
        return ((sb_rd(sb, SBDSP_STATUS) & 0x80) == 0);
}
 
static int
sb_dspwr(struct sb_info *sb, u_char val)
{
        int  i;
 
        for (i = 0; i < 1000; i++) {
                if (sb_dspready(sb)) {
                        sb_wr(sb, SBDSP_CMD, val);
                        return 1;
                }
                if (i > 10) DELAY((i > 100)? 1000 : 10);
        }
        printf("sb_dspwr(0x%02x) timed out.\n", val);
        return 0;
}
 
static int
sb_cmd(struct sb_info *sb, u_char val)
{
#if 0
        printf("sb_cmd: %x\n", val);
#endif
        return sb_dspwr(sb, val);
}
 
static int
sb_cmd1(struct sb_info *sb, u_char cmd, int val)
{
#if 0
        printf("sb_cmd1: %x, %x\n", cmd, val);
#endif
        if (sb_dspwr(sb, cmd)) {
                return sb_dspwr(sb, val & 0xff);
        } else return 0;
}
 
static int
sb_cmd2(struct sb_info *sb, u_char cmd, int val)
{
#if 0
        printf("sb_cmd2: %x, %x\n", cmd, val);
#endif
        if (sb_dspwr(sb, cmd)) {
                return sb_dspwr(sb, val & 0xff) &&
                       sb_dspwr(sb, (val >> 8) & 0xff);
        } else return 0;
}
 
/*
 * in the SB, there is a set of indirect "mixer" registers with
 * address at offset 4, data at offset 5
 *
 * we don't need to interlock these, the mixer lock will suffice.
 */
static void
sb_setmixer(struct sb_info *sb, u_int port, u_int value)
{
        sb_wr(sb, SB_MIX_ADDR, (u_char) (port & 0xff)); /* Select register */
        DELAY(10);
        sb_wr(sb, SB_MIX_DATA, (u_char) (value & 0xff));
        DELAY(10);
}
 
static int
sb_getmixer(struct sb_info *sb, u_int port)
{
        int val;
 
        sb_wr(sb, SB_MIX_ADDR, (u_char) (port & 0xff)); /* Select register */
        DELAY(10);
        val = sb_rd(sb, SB_MIX_DATA);
        DELAY(10);
 
        return val;
}
 
static u_int
sb_get_byte(struct sb_info *sb)
{
        int i;
 
        for (i = 1000; i > 0; i--) {
                if (sb_rd(sb, DSP_DATA_AVAIL) & 0x80)
                        return sb_rd(sb, DSP_READ);
                else
                        DELAY(20);
        }
        return 0xffff;
}
 
static int
sb_reset_dsp(struct sb_info *sb)
{
        sb_wr(sb, SBDSP_RST, 3);
        DELAY(100);
        sb_wr(sb, SBDSP_RST, 0);
        if (sb_get_byte(sb) != 0xAA) {
                DEB(printf("sb_reset_dsp 0x%lx failed\n",
                           rman_get_start(sb->io_base)));
                return ENXIO;   /* Sorry */
        }
        return 0;
}
 
static void
sb_release_resources(struct sb_info *sb, device_t dev)
{
        if (sb->irq) {
                if (sb->ih)
                        bus_teardown_intr(dev, sb->irq, sb->ih);
                bus_release_resource(dev, SYS_RES_IRQ, 0, sb->irq);
                sb->irq = NULL;
        }
        if (sb->drq) {
                isa_dma_release(rman_get_start(sb->drq));
                bus_release_resource(dev, SYS_RES_DRQ, 0, sb->drq);
                sb->drq = NULL;
        }
        if (sb->io_base) {
                bus_release_resource(dev, SYS_RES_IOPORT, 0, sb->io_base);
                sb->io_base = NULL;
        }
        if (sb->parent_dmat) {
                bus_dma_tag_destroy(sb->parent_dmat);
                sb->parent_dmat = 0;
        }
        free(sb, M_DEVBUF);
}
 
static int
sb_alloc_resources(struct sb_info *sb, device_t dev)
{
        int rid;
 
        rid = 0;
        if (!sb->io_base)
                sb->io_base = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
                        &rid, RF_ACTIVE);
        rid = 0;
        if (!sb->irq)
                sb->irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
                        &rid, RF_ACTIVE);
        rid = 0;
        if (!sb->drq)
                sb->drq = bus_alloc_resource_any(dev, SYS_RES_DRQ,
                        &rid, RF_ACTIVE);
 
        if (sb->io_base && sb->drq && sb->irq) {
                isa_dma_acquire(rman_get_start(sb->drq));
                isa_dmainit(rman_get_start(sb->drq), sb->bufsize);
 
                return 0;
        } else return ENXIO;
}
 
/************************************************************/
 
static int
sbpromix_init(struct snd_mixer *m)
{
        struct sb_info *sb = mix_getdevinfo(m);
 
        mix_setdevs(m, SOUND_MASK_SYNTH | SOUND_MASK_PCM | SOUND_MASK_LINE |
                       SOUND_MASK_MIC | SOUND_MASK_CD | SOUND_MASK_VOLUME);
 
        mix_setrecdevs(m, SOUND_MASK_LINE | SOUND_MASK_MIC | SOUND_MASK_CD);
 
        sb_setmixer(sb, 0, 1); /* reset mixer */
 
        return 0;
}
 
static int
sbpromix_set(struct snd_mixer *m, unsigned dev, unsigned left, unsigned right)
{
        struct sb_info *sb = mix_getdevinfo(m);
        int reg, max;
        u_char val;
 
        max = 7;
        switch (dev) {
        case SOUND_MIXER_PCM:
                reg = 0x04;
                break;
 
        case SOUND_MIXER_MIC:
                reg = 0x0a;
                max = 3;
                break;
 
        case SOUND_MIXER_VOLUME:
                reg = 0x22;
                break;
 
        case SOUND_MIXER_SYNTH:
                reg = 0x26;
                break;
 
        case SOUND_MIXER_CD:
                reg = 0x28;
                break;
 
        case SOUND_MIXER_LINE:
                reg = 0x2e;
                break;
 
        default:
                return -1;
        }
 
        left = (left * max) / 100;
        right = (dev == SOUND_MIXER_MIC)? left : ((right * max) / 100);
 
        val = (dev == SOUND_MIXER_MIC)? (left << 1) : (left << 5 | right << 1);
        sb_setmixer(sb, reg, val);
 
        left = (left * 100) / max;
        right = (right * 100) / max;
 
        return left | (right << 8);
}
 
static u_int32_t
sbpromix_setrecsrc(struct snd_mixer *m, u_int32_t src)
{
        struct sb_info *sb = mix_getdevinfo(m);
        u_char recdev;
 
        if      (src == SOUND_MASK_LINE)
                recdev = 0x06;
        else if (src == SOUND_MASK_CD)
                recdev = 0x02;
        else { /* default: mic */
                src = SOUND_MASK_MIC;
                recdev = 0;
        }
        sb_setmixer(sb, RECORD_SRC, recdev | (sb_getmixer(sb, RECORD_SRC) & ~0x07));
 
        return src;
}
 
static kobj_method_t sbpromix_mixer_methods[] = {
        KOBJMETHOD(mixer_init,          sbpromix_init),
        KOBJMETHOD(mixer_set,           sbpromix_set),
        KOBJMETHOD(mixer_setrecsrc,     sbpromix_setrecsrc),
        KOBJMETHOD_END
};
MIXER_DECLARE(sbpromix_mixer);
 
/************************************************************/
 
static int
sbmix_init(struct snd_mixer *m)
{
        struct sb_info *sb = mix_getdevinfo(m);
 
        mix_setdevs(m, SOUND_MASK_SYNTH | SOUND_MASK_PCM | SOUND_MASK_CD | SOUND_MASK_VOLUME);
 
        mix_setrecdevs(m, 0);
 
        sb_setmixer(sb, 0, 1); /* reset mixer */
 
        return 0;
}
 
static int
sbmix_set(struct snd_mixer *m, unsigned dev, unsigned left, unsigned right)
{
        struct sb_info *sb = mix_getdevinfo(m);
        int reg, max;
 
        max = 7;
        switch (dev) {
        case SOUND_MIXER_VOLUME:
                reg = 0x2;
                break;
 
        case SOUND_MIXER_SYNTH:
                reg = 0x6;
                break;
 
        case SOUND_MIXER_CD:
                reg = 0x8;
                break;
 
        case SOUND_MIXER_PCM:
                reg = 0x0a;
                max = 3;
                break;
 
        default:
                return -1;
        }
 
        left = (left * max) / 100;
 
        sb_setmixer(sb, reg, left << 1);
 
        left = (left * 100) / max;
 
        return left | (left << 8);
}
 
static u_int32_t
sbmix_setrecsrc(struct snd_mixer *m, u_int32_t src)
{
        return 0;
}
 
static kobj_method_t sbmix_mixer_methods[] = {
        KOBJMETHOD(mixer_init,          sbmix_init),
        KOBJMETHOD(mixer_set,           sbmix_set),
        KOBJMETHOD(mixer_setrecsrc,     sbmix_setrecsrc),
        KOBJMETHOD_END
};
MIXER_DECLARE(sbmix_mixer);
 
/************************************************************/
 
static void
sb_intr(void *arg)
{
        struct sb_info *sb = (struct sb_info *)arg;
 
        sb_lock(sb);
        if (sndbuf_runsz(sb->pch.buffer) > 0) {
                sb_unlock(sb);
                chn_intr(sb->pch.channel);
                sb_lock(sb);
        }
 
        if (sndbuf_runsz(sb->rch.buffer) > 0) {
                sb_unlock(sb);
                chn_intr(sb->rch.channel);
                sb_lock(sb);
        }
 
        sb_rd(sb, DSP_DATA_AVAIL); /* int ack */
        sb_unlock(sb);
}
 
static int
sb_speed(struct sb_chinfo *ch)
{
        struct sb_info *sb = ch->parent;
        int play = (ch->dir == PCMDIR_PLAY)? 1 : 0;
        int stereo = (AFMT_CHANNEL(ch->fmt) > 1)? 1 : 0;
        int speed, tmp, thresh, max;
        u_char tconst;
 
        if (sb->bd_id >= 0x300) {
                thresh = stereo? 11025 : 23000;
                max = stereo? 22050 : 44100;
        } else if (sb->bd_id > 0x200) {
                thresh = play? 23000 : 13000;
                max = play? 44100 : 15000;
        } else {
                thresh = 999999;
                max = play? 23000 : 13000;
        }
 
        speed = ch->spd;
        if (speed > max)
                speed = max;
 
        sb_lock(sb);
        sb->bd_flags &= ~BD_F_HISPEED;
        if (speed > thresh)
                sb->bd_flags |= BD_F_HISPEED;
 
        tmp = 65536 - (256000000 / (speed << stereo));
        tconst = tmp >> 8;
 
        sb_cmd1(sb, 0x40, tconst); /* set time constant */
 
        speed = (256000000 / (65536 - tmp)) >> stereo;
 
        ch->spd = speed;
        sb_unlock(sb);
        return speed;
}
 
static int
sb_start(struct sb_chinfo *ch)
{
        struct sb_info *sb = ch->parent;
        int play = (ch->dir == PCMDIR_PLAY)? 1 : 0;
        int stereo = (AFMT_CHANNEL(ch->fmt) > 1)? 1 : 0;
        int l = ch->blksz;
        u_char i;
 
        l--;
 
        sb_lock(sb);
        if (play)
                sb_cmd(sb, DSP_CMD_SPKON);
 
        if (sb->bd_flags & BD_F_HISPEED)
                i = play? 0x90 : 0x98;
        else
                i = play? 0x1c : 0x2c;
 
        sb_setmixer(sb, 0x0e, stereo? 2 : 0);
        sb_cmd2(sb, 0x48, l);
        sb_cmd(sb, i);
 
        sb->bd_flags |= BD_F_DMARUN;
        sb_unlock(sb);
        return 0;
}
 
static int
sb_stop(struct sb_chinfo *ch)
{
        struct sb_info *sb = ch->parent;
        int play = (ch->dir == PCMDIR_PLAY)? 1 : 0;
 
        sb_lock(sb);
        if (sb->bd_flags & BD_F_HISPEED)
                sb_reset_dsp(sb);
        else {
#if 0
                /*
                 * NOTE: DSP_CMD_DMAEXIT_8 does not work with old
                 * soundblaster.
                 */
                sb_cmd(sb, DSP_CMD_DMAEXIT_8);
#endif
                sb_reset_dsp(sb);
        }
 
        if (play)
                sb_cmd(sb, DSP_CMD_SPKOFF); /* speaker off */
        sb_unlock(sb);
        sb->bd_flags &= ~BD_F_DMARUN;
        return 0;
}
 
/* channel interface */
static void *
sbchan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
{
        struct sb_info *sb = devinfo;
        struct sb_chinfo *ch = (dir == PCMDIR_PLAY)? &sb->pch : &sb->rch;
 
        ch->parent = sb;
        ch->channel = c;
        ch->dir = dir;
        ch->buffer = b;
        if (sndbuf_alloc(ch->buffer, sb->parent_dmat, 0, sb->bufsize) != 0)
                return NULL;
        sndbuf_dmasetup(ch->buffer, sb->drq);
        return ch;
}
 
static int
sbchan_setformat(kobj_t obj, void *data, u_int32_t format)
{
        struct sb_chinfo *ch = data;
 
        ch->fmt = format;
        return 0;
}
 
static u_int32_t
sbchan_setspeed(kobj_t obj, void *data, u_int32_t speed)
{
        struct sb_chinfo *ch = data;
 
        ch->spd = speed;
        return sb_speed(ch);
}
 
static u_int32_t
sbchan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
{
        struct sb_chinfo *ch = data;
 
        ch->blksz = blocksize;
        return ch->blksz;
}
 
static int
sbchan_trigger(kobj_t obj, void *data, int go)
{
        struct sb_chinfo *ch = data;
 
        if (!PCMTRIG_COMMON(go))
                return 0;
 
        sndbuf_dma(ch->buffer, go);
        if (go == PCMTRIG_START)
                sb_start(ch);
        else
                sb_stop(ch);
        return 0;
}
 
static u_int32_t
sbchan_getptr(kobj_t obj, void *data)
{
        struct sb_chinfo *ch = data;
 
        return sndbuf_dmaptr(ch->buffer);
}
 
static struct pcmchan_caps *
sbchan_getcaps(kobj_t obj, void *data)
{
        struct sb_chinfo *ch = data;
        int p = (ch->dir == PCMDIR_PLAY)? 1 : 0;
 
        if (ch->parent->bd_id == 0x200)
                return p? &sb200_playcaps : &sb200_reccaps;
        if (ch->parent->bd_id < 0x300)
                return p? &sb201_playcaps : &sb201_reccaps;
        return p? &sbpro_playcaps : &sbpro_reccaps;
}
 
static kobj_method_t sbchan_methods[] = {
        KOBJMETHOD(channel_init,                sbchan_init),
        KOBJMETHOD(channel_setformat,           sbchan_setformat),
        KOBJMETHOD(channel_setspeed,            sbchan_setspeed),
        KOBJMETHOD(channel_setblocksize,        sbchan_setblocksize),
        KOBJMETHOD(channel_trigger,             sbchan_trigger),
        KOBJMETHOD(channel_getptr,              sbchan_getptr),
        KOBJMETHOD(channel_getcaps,             sbchan_getcaps),
        KOBJMETHOD_END
};
CHANNEL_DECLARE(sbchan);
 
/************************************************************/
 
static int
sb_probe(device_t dev)
{
        char buf[64];
        uintptr_t func, ver, r, f;
 
        /* The parent device has already been probed. */
        r = BUS_READ_IVAR(device_get_parent(dev), dev, 0, &func);
        if (func != SCF_PCM)
                return (ENXIO);
 
        r = BUS_READ_IVAR(device_get_parent(dev), dev, 1, &ver);
        f = (ver & 0xffff0000) >> 16;
        ver &= 0x0000ffff;
        if ((f & BD_F_ESS) || (ver >= 0x400))
                return (ENXIO);
 
        snprintf(buf, sizeof buf, "SB DSP %d.%02d", (int) ver >> 8, (int) ver & 0xff);
 
        device_set_desc_copy(dev, buf);
 
        return 0;
}
 
static int
sb_attach(device_t dev)
{
        struct sb_info *sb;
        char status[SND_STATUSLEN];
        uintptr_t ver;
 
        gone_in_dev(dev, 14, "ISA sound driver");
        sb = malloc(sizeof(*sb), M_DEVBUF, M_WAITOK | M_ZERO);
        sb->parent_dev = device_get_parent(dev);
        BUS_READ_IVAR(device_get_parent(dev), dev, 1, &ver);
        sb->bd_id = ver & 0x0000ffff;
        sb->bd_flags = (ver & 0xffff0000) >> 16;
        sb->bufsize = pcm_getbuffersize(dev, 4096, SB_DEFAULT_BUFSZ, 65536);
 
        if (sb_alloc_resources(sb, dev))
                goto no;
        if (sb_reset_dsp(sb))
                goto no;
        if (mixer_init(dev, (sb->bd_id < 0x300)? &sbmix_mixer_class : &sbpromix_mixer_class, sb))
                goto no;
        if (snd_setup_intr(dev, sb->irq, 0, sb_intr, sb, &sb->ih))
                goto no;
 
        pcm_setflags(dev, pcm_getflags(dev) | SD_F_SIMPLEX);
 
        if (bus_dma_tag_create(/*parent*/bus_get_dma_tag(dev), /*alignment*/2,
                        /*boundary*/0,
                        /*lowaddr*/BUS_SPACE_MAXADDR_24BIT,
                        /*highaddr*/BUS_SPACE_MAXADDR,
                        /*filter*/NULL, /*filterarg*/NULL,
                        /*maxsize*/sb->bufsize, /*nsegments*/1,
                        /*maxsegz*/0x3ffff, /*flags*/0,
                        /*lockfunc*/NULL, /*lockarg*/NULL,
                        &sb->parent_dmat) != 0) {
                device_printf(dev, "unable to create dma tag\n");
                goto no;
        }
 
        snprintf(status, SND_STATUSLEN, "at io 0x%jx irq %jd drq %jd bufsz %u %s",
                rman_get_start(sb->io_base), rman_get_start(sb->irq),
                rman_get_start(sb->drq), sb->bufsize, PCM_KLDSTRING(snd_sb8));
 
        if (pcm_register(dev, sb, 1, 1))
                goto no;
        pcm_addchan(dev, PCMDIR_REC, &sbchan_class, sb);
        pcm_addchan(dev, PCMDIR_PLAY, &sbchan_class, sb);
 
        pcm_setstatus(dev, status);
 
        return 0;
 
no:
        sb_release_resources(sb, dev);
        return ENXIO;
}
 
static int
sb_detach(device_t dev)
{
        int r;
        struct sb_info *sb;
 
        r = pcm_unregister(dev);
        if (r)
                return r;
 
        sb = pcm_getdevinfo(dev);
        sb_release_resources(sb, dev);
        return 0;
}
 
static device_method_t sb_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         sb_probe),
        DEVMETHOD(device_attach,        sb_attach),
        DEVMETHOD(device_detach,        sb_detach),
        { 0, 0 }
};
 
static driver_t sb_driver = {
        "pcm",
        sb_methods,
        PCM_SOFTC_SIZE,
};
 
DRIVER_MODULE(snd_sb8, sbc, sb_driver, pcm_devclass, 0, 0);
MODULE_DEPEND(snd_sb8, sound, SOUND_MINVER, SOUND_PREFVER, SOUND_MAXVER);
MODULE_DEPEND(snd_sb8, snd_sbc, 1, 1, 1);
MODULE_VERSION(snd_sb8, 1);