snapper.c

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/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD AND BSD-3-Clause
 *
 * Copyright 2008 by Marco Trillo. 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 ``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 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.
 *
 * $FreeBSD$
 */
/*-
 * Copyright (c) 2002, 2003 Tsubai Masanari.  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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 *
 *      NetBSD: snapper.c,v 1.28 2008/05/16 03:49:54 macallan Exp
 *      Id: snapper.c,v 1.11 2002/10/31 17:42:13 tsubai Exp 
 */
 
/*
 *      Apple Snapper audio.
 */
 
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <machine/dbdma.h>
#include <machine/intr_machdep.h>
#include <machine/resource.h>
#include <machine/bus.h>
#include <machine/pio.h>
#include <sys/rman.h>
 
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iiconf.h>
#include <dev/ofw/ofw_bus.h>
 
#ifdef HAVE_KERNEL_OPTION_HEADERS
#include "opt_snd.h"
#endif
 
#include <dev/sound/pcm/sound.h>
 
#include "mixer_if.h"
 
extern kobj_class_t i2s_mixer_class;
extern device_t i2s_mixer;
 
struct snapper_softc
{
        device_t sc_dev;
        uint32_t sc_addr;
};
 
static int      snapper_probe(device_t);
static int      snapper_attach(device_t);
static int      snapper_init(struct snd_mixer *m);
static int      snapper_uninit(struct snd_mixer *m);
static int      snapper_reinit(struct snd_mixer *m);
static int      snapper_set(struct snd_mixer *m, unsigned dev, unsigned left,
                    unsigned right);
static u_int32_t        snapper_setrecsrc(struct snd_mixer *m, u_int32_t src);
 
static device_method_t snapper_methods[] = {
        /* Device interface. */
        DEVMETHOD(device_probe,         snapper_probe),
        DEVMETHOD(device_attach,        snapper_attach),
        { 0, 0 }
};
 
static driver_t snapper_driver = {
        "snapper",
        snapper_methods,
        sizeof(struct snapper_softc)
};
static devclass_t snapper_devclass;
 
DRIVER_MODULE(snapper, iicbus, snapper_driver, snapper_devclass, 0, 0);
MODULE_VERSION(snapper, 1);
MODULE_DEPEND(snapper, iicbus, 1, 1, 1);
 
static kobj_method_t snapper_mixer_methods[] = {
        KOBJMETHOD(mixer_init,          snapper_init),
        KOBJMETHOD(mixer_uninit,        snapper_uninit),
        KOBJMETHOD(mixer_reinit,        snapper_reinit),
        KOBJMETHOD(mixer_set,           snapper_set),
        KOBJMETHOD(mixer_setrecsrc,     snapper_setrecsrc),
        KOBJMETHOD_END
};
 
MIXER_DECLARE(snapper_mixer);
 
#define SNAPPER_IICADDR 0x6a    /* Hard-coded I2C slave addr */
 
/* Snapper (Texas Instruments TAS3004) registers. */
#define SNAPPER_MCR1    0x01    /* Main control register 1 (1byte) */
#define SNAPPER_DRC     0x02    /* Dynamic range compression (6bytes) */
#define SNAPPER_VOLUME  0x04    /* Volume (6bytes) */
#define SNAPPER_TREBLE  0x05    /* Treble control (1byte) */
#define SNAPPER_BASS    0x06    /* Bass control (1byte) */
#define SNAPPER_MIXER_L 0x07    /* Mixer left gain (9bytes) */
#define SNAPPER_MIXER_R 0x08    /* Mixer right gain (9bytes) */
#define SNAPPER_LB0     0x0a    /* Left biquad 0 (15bytes) */
#define SNAPPER_LB1     0x0b    /* Left biquad 1 (15bytes) */
#define SNAPPER_LB2     0x0c    /* Left biquad 2 (15bytes) */
#define SNAPPER_LB3     0x0d    /* Left biquad 3 (15bytes) */
#define SNAPPER_LB4     0x0e    /* Left biquad 4 (15bytes) */
#define SNAPPER_LB5     0x0f    /* Left biquad 5 (15bytes) */
#define SNAPPER_LB6     0x10    /* Left biquad 6 (15bytes) */
#define SNAPPER_RB0     0x13    /* Right biquad 0 (15bytes) */
#define SNAPPER_RB1     0x14    /* Right biquad 1 (15bytes) */
#define SNAPPER_RB2     0x15    /* Right biquad 2 (15bytes) */
#define SNAPPER_RB3     0x16    /* Right biquad 3 (15bytes) */
#define SNAPPER_RB4     0x17    /* Right biquad 4 (15bytes) */
#define SNAPPER_RB5     0x18    /* Right biquad 5 (15bytes) */
#define SNAPPER_RB6     0x19    /* Right biquad 6 (15bytes) */
#define SNAPPER_LLB     0x21    /* Left loudness biquad (15bytes) */
#define SNAPPER_RLB     0x22    /* Right loudness biquad (15bytes) */
#define SNAPPER_LLB_GAIN        0x23    /* Left loudness biquad gain (3bytes) */
#define SNAPPER_RLB_GAIN        0x24    /* Right loudness biquad gain (3bytes) */
#define SNAPPER_ACR             0x40    /* Analog control register (1byte) */
#define SNAPPER_MCR2    0x43    /* Main control register 2 (1byte) */
#define SNAPPER_MCR1_FL 0x80    /* Fast load */
#define SNAPPER_MCR1_SC 0x40    /* SCLK frequency */
#define  SNAPPER_MCR1_SC_32     0x00    /*  32fs */
#define  SNAPPER_MCR1_SC_64     0x40    /*  64fs */
#define SNAPPER_MCR1_SM 0x30    /* Output serial port mode */
#define  SNAPPER_MCR1_SM_L      0x00    /*  Left justified */
#define  SNAPPER_MCR1_SM_R      0x10    /*  Right justified */
#define  SNAPPER_MCR1_SM_I2S 0x20       /*  I2S */
#define SNAPPER_MCR1_W  0x03    /* Serial port word length */
#define  SNAPPER_MCR1_W_16      0x00    /*  16 bit */
#define  SNAPPER_MCR1_W_18      0x01    /*  18 bit */
#define  SNAPPER_MCR1_W_20      0x02    /*  20 bit */
#define  SNAPPER_MCR1_W_24      0x03    /*  24 bit */
#define SNAPPER_MCR2_DL 0x80    /* Download */
#define SNAPPER_MCR2_AP 0x02    /* All pass mode */
#define SNAPPER_ACR_ADM 0x80    /* ADC output mode */
#define SNAPPER_ACR_LRB 0x40    /* Select B input */
#define SNAPPER_ACR_DM  0x0c    /* De-emphasis control */
#define  SNAPPER_ACR_DM_OFF     0x00    /*  off */
#define  SNAPPER_ACR_DM_48      0x04    /*  fs = 48kHz */
#define  SNAPPER_ACR_DM_44      0x08    /*  fs = 44.1kHz */
#define SNAPPER_ACR_INP 0x02    /* Analog input select */
#define  SNAPPER_ACR_INP_A      0x00    /*  A */
#define  SNAPPER_ACR_INP_B      0x02    /*  B */
#define SNAPPER_ACR_APD 0x01    /* Analog power down */
 
struct snapper_reg {
        u_char MCR1[1];
        u_char DRC[6];
        u_char VOLUME[6];
        u_char TREBLE[1];
        u_char BASS[1];
        u_char MIXER_L[9];
        u_char MIXER_R[9];
        u_char LB0[15];
        u_char LB1[15];
        u_char LB2[15];
        u_char LB3[15];
        u_char LB4[15];
        u_char LB5[15];
        u_char LB6[15];
        u_char RB0[15];
        u_char RB1[15];
        u_char RB2[15];
        u_char RB3[15];
        u_char RB4[15];
        u_char RB5[15];
        u_char RB6[15];
        u_char LLB[15];
        u_char RLB[15];
        u_char LLB_GAIN[3];
        u_char RLB_GAIN[3];
        u_char ACR[1];
        u_char MCR2[1];
};
 
static const struct snapper_reg snapper_initdata = {
        { SNAPPER_MCR1_SC_64 | SNAPPER_MCR1_SM_I2S | 
          SNAPPER_MCR1_W_16 },                                  /* MCR1 */
        { 1, 0, 0, 0, 0, 0 },                                   /* DRC */
        { 0, 0, 0, 0, 0, 0 },                                   /* VOLUME */
        { 0x72 },                                               /* TREBLE */
        { 0x72 },                                               /* BASS */
        { 0x10, 0x00, 0x00, 0, 0, 0, 0, 0, 0 },                 /* MIXER_L */
        { 0x10, 0x00, 0x00, 0, 0, 0, 0, 0, 0 },                 /* MIXER_R */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0x10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },     /* BIQUAD */
        { 0, 0, 0 },                                            /* LLB_GAIN */
        { 0, 0, 0 },                                            /* RLB_GAIN */
        { SNAPPER_ACR_ADM | SNAPPER_ACR_LRB | SNAPPER_ACR_INP_B },/* ACR */
        { SNAPPER_MCR2_AP }                                      /* MCR2 */
};
 
static const char snapper_regsize[] = {
        0,                                      /* 0x00 */
        sizeof snapper_initdata.MCR1,           /* 0x01 */
        sizeof snapper_initdata.DRC,            /* 0x02 */
        0,                                      /* 0x03 */
        sizeof snapper_initdata.VOLUME,         /* 0x04 */
        sizeof snapper_initdata.TREBLE,         /* 0x05 */
        sizeof snapper_initdata.BASS,           /* 0x06 */
        sizeof snapper_initdata.MIXER_L,        /* 0x07 */
        sizeof snapper_initdata.MIXER_R,        /* 0x08 */
        0,                                      /* 0x09 */
        sizeof snapper_initdata.LB0,            /* 0x0a */
        sizeof snapper_initdata.LB1,            /* 0x0b */
        sizeof snapper_initdata.LB2,            /* 0x0c */
        sizeof snapper_initdata.LB3,            /* 0x0d */
        sizeof snapper_initdata.LB4,            /* 0x0e */
        sizeof snapper_initdata.LB5,            /* 0x0f */
        sizeof snapper_initdata.LB6,            /* 0x10 */
        0,                                      /* 0x11 */
        0,                                      /* 0x12 */
        sizeof snapper_initdata.RB0,            /* 0x13 */
        sizeof snapper_initdata.RB1,            /* 0x14 */
        sizeof snapper_initdata.RB2,            /* 0x15 */
        sizeof snapper_initdata.RB3,            /* 0x16 */
        sizeof snapper_initdata.RB4,            /* 0x17 */
        sizeof snapper_initdata.RB5,            /* 0x18 */
        sizeof snapper_initdata.RB6,            /* 0x19 */
        0,0,0,0, 0,0,
        0,                                      /* 0x20 */
        sizeof snapper_initdata.LLB,            /* 0x21 */
        sizeof snapper_initdata.RLB,            /* 0x22 */
        sizeof snapper_initdata.LLB_GAIN,       /* 0x23 */
        sizeof snapper_initdata.RLB_GAIN,       /* 0x24 */
        0,0,0,0, 0,0,0,0, 0,0,0,
        0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
        sizeof snapper_initdata.ACR,            /* 0x40 */
        0,                                      /* 0x41 */
        0,                                      /* 0x42 */
        sizeof snapper_initdata.MCR2            /* 0x43 */
};
 
/* dB = 20 * log (x) table. */
static u_int    snapper_volume_table[100] = {           
        0x00000148,   0x0000015C,   0x00000171,   0x00000186,   // -46.0,       -45.5,  -45.0,  -44.5,
        0x0000019E,   0x000001B6,   0x000001D0,   0x000001EB,   // -44.0,       -43.5,  -43.0,  -42.5,
        0x00000209,   0x00000227,   0x00000248,   0x0000026B,   // -42.0,       -41.5,  -41.0,  -40.5,
        0x0000028F,   0x000002B6,   0x000002DF,   0x0000030B,   // -40.0,       -39.5,  -39.0,  -38.5,
        0x00000339,   0x0000036A,   0x0000039E,   0x000003D5,   // -38.0,       -37.5,  -37.0,  -36.5,
        0x0000040F,   0x0000044C,   0x0000048D,   0x000004D2,   // -36.0,       -35.5,  -35.0,  -34.5,
        0x0000051C,   0x00000569,   0x000005BB,   0x00000612,   // -34.0,       -33.5,  -33.0,  -32.5,
        0x0000066E,   0x000006D0,   0x00000737,   0x000007A5,   // -32.0,       -31.5,  -31.0,  -30.5,
        0x00000818,   0x00000893,   0x00000915,   0x0000099F,   // -30.0,       -29.5,  -29.0,  -28.5,
        0x00000A31,   0x00000ACC,   0x00000B6F,   0x00000C1D,   // -28.0,       -27.5,  -27.0,  -26.5,
        0x00000CD5,   0x00000D97,   0x00000E65,   0x00000F40,   // -26.0,       -25.5,  -25.0,  -24.5,
        0x00001027,   0x0000111C,   0x00001220,   0x00001333,   // -24.0,       -23.5,  -23.0,  -22.5,
        0x00001456,   0x0000158A,   0x000016D1,   0x0000182B,   // -22.0,       -21.5,  -21.0,  -20.5,
        0x0000199A,   0x00001B1E,   0x00001CB9,   0x00001E6D,   // -20.0,       -19.5,  -19.0,  -18.5,
        0x0000203A,   0x00002223,   0x00002429,   0x0000264E,   // -18.0,       -17.5,  -17.0,  -16.5,
        0x00002893,   0x00002AFA,   0x00002D86,   0x00003039,   // -16.0,       -15.5,  -15.0,  -14.5,
        0x00003314,   0x0000361B,   0x00003950,   0x00003CB5,   // -14.0,       -13.5,  -13.0,  -12.5,
        0x0000404E,   0x0000441D,   0x00004827,   0x00004C6D,   // -12.0,       -11.5,  -11.0,  -10.5,
        0x000050F4,   0x000055C0,   0x00005AD5,   0x00006037,   // -10.0,       -9.5,   -9.0,   -8.5,
        0x000065EA,   0x00006BF4,   0x0000725A,   0x00007920,   // -8.0,        -7.5,   -7.0,   -6.5,
        0x0000804E,   0x000087EF,   0x00008FF6,   0x0000987D,   // -6.0,        -5.5,   -5.0,   -4.5,
        0x0000A186,   0x0000AB19,   0x0000B53C,   0x0000BFF9,   // -4.0,        -3.5,   -3.0,   -2.5,
        0x0000CB59,   0x0000D766,   0x0000E429,   0x0000F1AE,   // -2.0,        -1.5,   -1.0,   -0.5,
        0x00010000,   0x00010F2B,   0x00011F3D,   0x00013042,   // 0.0,   +0.5, +1.0,   +1.5,
        0x00014249,   0x00015562,   0x0001699C,   0x00017F09    // 2.0,   +2.5, +3.0,   +3.5,
};
 
static int
snapper_write(struct snapper_softc *sc, uint8_t reg, const void *data)
{
        u_int size;
        uint8_t buf[16];
 
        struct iic_msg msg[] = {
                { sc->sc_addr, IIC_M_WR, 0, buf }
        };
                
        KASSERT(reg < sizeof(snapper_regsize), ("bad reg"));
        size = snapper_regsize[reg];
        msg[0].len = size + 1;
        buf[0] = reg;
        memcpy(&buf[1], data, size);
 
        iicbus_transfer(sc->sc_dev, msg, 1);
 
        return (0);
}
 
static int
snapper_probe(device_t dev)
{
        const char *name, *compat;
 
        name = ofw_bus_get_name(dev);
        if (name == NULL)
                return (ENXIO);
 
        if (strcmp(name, "deq") == 0) {
                if (iicbus_get_addr(dev) != SNAPPER_IICADDR)
                        return (ENXIO);
        } else if (strcmp(name, "codec") == 0) {
                compat = ofw_bus_get_compat(dev);
                if (compat == NULL || strcmp(compat, "tas3004") != 0)
                        return (ENXIO);
        } else {
                return (ENXIO);
        }
 
        device_set_desc(dev, "Texas Instruments TAS3004 Audio Codec");
        return (0);
}
 
static int
snapper_attach(device_t dev)
{
        struct snapper_softc *sc;
                
        sc = device_get_softc(dev);
        sc->sc_dev = dev;
        sc->sc_addr = iicbus_get_addr(dev);
 
        i2s_mixer_class = &snapper_mixer_class;
        i2s_mixer = dev;
 
        return (0);
}
 
static int
snapper_init(struct snd_mixer *m)
{
        struct snapper_softc *sc;
        u_int           x = 0;
 
        sc = device_get_softc(mix_getdevinfo(m));
 
        snapper_write(sc, SNAPPER_LB0, snapper_initdata.LB0);
        snapper_write(sc, SNAPPER_LB1, snapper_initdata.LB1);
        snapper_write(sc, SNAPPER_LB2, snapper_initdata.LB2);
        snapper_write(sc, SNAPPER_LB3, snapper_initdata.LB3);
        snapper_write(sc, SNAPPER_LB4, snapper_initdata.LB4);
        snapper_write(sc, SNAPPER_LB5, snapper_initdata.LB5);
        snapper_write(sc, SNAPPER_LB6, snapper_initdata.LB6);
        snapper_write(sc, SNAPPER_RB0, snapper_initdata.RB0);
        snapper_write(sc, SNAPPER_RB1, snapper_initdata.RB1);
        snapper_write(sc, SNAPPER_RB1, snapper_initdata.RB1);
        snapper_write(sc, SNAPPER_RB2, snapper_initdata.RB2);
        snapper_write(sc, SNAPPER_RB3, snapper_initdata.RB3);
        snapper_write(sc, SNAPPER_RB4, snapper_initdata.RB4);
        snapper_write(sc, SNAPPER_RB5, snapper_initdata.RB5);
        snapper_write(sc, SNAPPER_RB6, snapper_initdata.RB6);
        snapper_write(sc, SNAPPER_MCR1, snapper_initdata.MCR1);
        snapper_write(sc, SNAPPER_MCR2, snapper_initdata.MCR2);
        snapper_write(sc, SNAPPER_DRC, snapper_initdata.DRC);
        snapper_write(sc, SNAPPER_VOLUME, snapper_initdata.VOLUME);
        snapper_write(sc, SNAPPER_TREBLE, snapper_initdata.TREBLE);
        snapper_write(sc, SNAPPER_BASS, snapper_initdata.BASS);
        snapper_write(sc, SNAPPER_MIXER_L, snapper_initdata.MIXER_L);
        snapper_write(sc, SNAPPER_MIXER_R, snapper_initdata.MIXER_R);
        snapper_write(sc, SNAPPER_LLB, snapper_initdata.LLB);
        snapper_write(sc, SNAPPER_RLB, snapper_initdata.RLB);
        snapper_write(sc, SNAPPER_LLB_GAIN, snapper_initdata.LLB_GAIN);
        snapper_write(sc, SNAPPER_RLB_GAIN, snapper_initdata.RLB_GAIN);
        snapper_write(sc, SNAPPER_ACR, snapper_initdata.ACR);
 
        x |= SOUND_MASK_VOLUME;
        mix_setdevs(m, x);
 
        return (0);
}
 
static int
snapper_uninit(struct snd_mixer *m)
{
        return (0);
}
 
static int
snapper_reinit(struct snd_mixer *m)
{
        return (0);
}
 
static int
snapper_set(struct snd_mixer *m, unsigned dev, unsigned left, unsigned right)
{
        struct snapper_softc *sc;
        struct mtx *mixer_lock;
        int locked;
        u_int l, r;
        u_char reg[6];
 
        sc = device_get_softc(mix_getdevinfo(m));
        mixer_lock = mixer_get_lock(m);
        locked = mtx_owned(mixer_lock);
 
        if (left > 100 || right > 100)
                return (0);
 
        l = (left == 0) ? 0 : snapper_volume_table[left - 1];
        r = (right == 0) ? 0 : snapper_volume_table[right - 1];
 
        switch (dev) {
        case SOUND_MIXER_VOLUME:
                reg[0] = (l & 0xff0000) >> 16;
                reg[1] = (l & 0x00ff00) >> 8;
                reg[2] = l & 0x0000ff;
                reg[3] = (r & 0xff0000) >> 16;
                reg[4] = (r & 0x00ff00) >> 8;
                reg[5] = r & 0x0000ff;
 
                /*
                 * We need to unlock the mixer lock because iicbus_transfer()
                 * may sleep. The mixer lock itself is unnecessary here
                 * because it is meant to serialize hardware access, which
                 * is taken care of by the I2C layer, so this is safe.
                 */
 
                if (locked)
                        mtx_unlock(mixer_lock);
 
                snapper_write(sc, SNAPPER_VOLUME, reg);
 
                if (locked)
                        mtx_lock(mixer_lock);
 
                return (left | (right << 8));
        }
 
        return (0);
}
 
static u_int32_t
snapper_setrecsrc(struct snd_mixer *m, u_int32_t src)
{
        return (0);
}