tumbler.c

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/*
 * PMac Tumbler/Snapper lowlevel functions
 *
 * Copyright (c) by Takashi Iwai <[email protected]>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *   Rene Rebe <[email protected]>:
 *     * update from shadow registers on wakeup and headphone plug
 *     * automatically toggle DRC on headphone plug
 *  
 */


#include <linux/init.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <sound/core.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include "pmac.h"
#include "tumbler_volume.h"

#undef DEBUG

#ifdef DEBUG
#define DBG(fmt...) printk(KERN_DEBUG fmt)
#else
#define DBG(fmt...)
#endif

#define IS_G4DA (of_machine_is_compatible("PowerMac3,4"))

/* i2c address for tumbler */
#define TAS_I2C_ADDR    0x34

/* registers */
#define TAS_REG_MCS 0x01    /* main control */
#define TAS_REG_DRC 0x02
#define TAS_REG_VOL 0x04
#define TAS_REG_TREBLE  0x05
#define TAS_REG_BASS    0x06
#define TAS_REG_INPUT1  0x07
#define TAS_REG_INPUT2  0x08

/* tas3001c */
#define TAS_REG_PCM TAS_REG_INPUT1
 
/* tas3004 */
#define TAS_REG_LMIX    TAS_REG_INPUT1
#define TAS_REG_RMIX    TAS_REG_INPUT2
#define TAS_REG_MCS2    0x43        /* main control 2 */
#define TAS_REG_ACS 0x40        /* analog control */

/* mono volumes for tas3001c/tas3004 */
enum {
    VOL_IDX_PCM_MONO, /* tas3001c only */
    VOL_IDX_BASS, VOL_IDX_TREBLE,
    VOL_IDX_LAST_MONO
};

/* stereo volumes for tas3004 */
enum {
    VOL_IDX_PCM, VOL_IDX_PCM2, VOL_IDX_ADC,
    VOL_IDX_LAST_MIX
};

struct pmac_gpio {
    unsigned int addr;
    u8 active_val;
    u8 inactive_val;
    u8 active_state;
};

struct pmac_tumbler {
    struct pmac_keywest i2c;
    struct pmac_gpio audio_reset;
    struct pmac_gpio amp_mute;
    struct pmac_gpio line_mute;
    struct pmac_gpio line_detect;
    struct pmac_gpio hp_mute;
    struct pmac_gpio hp_detect;
    int headphone_irq;
    int lineout_irq;
    unsigned int save_master_vol[2];
    unsigned int master_vol[2];
    unsigned int save_master_switch[2];
    unsigned int master_switch[2];
    unsigned int mono_vol[VOL_IDX_LAST_MONO];
    unsigned int mix_vol[VOL_IDX_LAST_MIX][2]; /* stereo volumes for tas3004 */
    int drc_range;
    int drc_enable;
    int capture_source;
    int anded_reset;
    int auto_mute_notify;
    int reset_on_sleep;
    u8  acs;
};


/*
 */

static int send_init_client(struct pmac_keywest *i2c, unsigned int *regs)
{
    while (*regs > 0) {
        int err, count = 10;
        do {
            err = i2c_smbus_write_byte_data(i2c->client,
                            regs[0], regs[1]);
            if (err >= 0)
                break;
            DBG("(W) i2c error %d\n", err);
            mdelay(10);
        } while (count--);
        if (err < 0)
            return -ENXIO;
        regs += 2;
    }
    return 0;
}


static int tumbler_init_client(struct pmac_keywest *i2c)
{
    static unsigned int regs[] = {
        /* normal operation, SCLK=64fps, i2s output, i2s input, 16bit width */
        TAS_REG_MCS, (1<<6)|(2<<4)|(2<<2)|0,
        0, /* terminator */
    };
    DBG("(I) tumbler init client\n");
    return send_init_client(i2c, regs);
}

static int snapper_init_client(struct pmac_keywest *i2c)
{
    static unsigned int regs[] = {
        /* normal operation, SCLK=64fps, i2s output, 16bit width */
        TAS_REG_MCS, (1<<6)|(2<<4)|0,
        /* normal operation, all-pass mode */
        TAS_REG_MCS2, (1<<1),
        /* normal output, no deemphasis, A input, power-up, line-in */
        TAS_REG_ACS, 0,
        0, /* terminator */
    };
    DBG("(I) snapper init client\n");
    return send_init_client(i2c, regs);
}
    
/*
 * gpio access
 */
#define do_gpio_write(gp, val) \
    pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, (gp)->addr, val)
#define do_gpio_read(gp) \
    pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, (gp)->addr, 0)
#define tumbler_gpio_free(gp) /* NOP */

static void write_audio_gpio(struct pmac_gpio *gp, int active)
{
    if (! gp->addr)
        return;
    active = active ? gp->active_val : gp->inactive_val;
    do_gpio_write(gp, active);
    DBG("(I) gpio %x write %d\n", gp->addr, active);
}

static int check_audio_gpio(struct pmac_gpio *gp)
{
    int ret;

    if (! gp->addr)
        return 0;

    ret = do_gpio_read(gp);

    return (ret & 0x1) == (gp->active_val & 0x1);
}

static int read_audio_gpio(struct pmac_gpio *gp)
{
    int ret;
    if (! gp->addr)
        return 0;
    ret = do_gpio_read(gp);
    ret = (ret & 0x02) !=0;
    return ret == gp->active_state;
}

/*
 * update master volume
 */
static int tumbler_set_master_volume(struct pmac_tumbler *mix)
{
    unsigned char block[6];
    unsigned int left_vol, right_vol;
  
    if (! mix->i2c.client)
        return -ENODEV;
  
    if (! mix->master_switch[0])
        left_vol = 0;
    else {
        left_vol = mix->master_vol[0];
        if (left_vol >= ARRAY_SIZE(master_volume_table))
            left_vol = ARRAY_SIZE(master_volume_table) - 1;
        left_vol = master_volume_table[left_vol];
    }
    if (! mix->master_switch[1])
        right_vol = 0;
    else {
        right_vol = mix->master_vol[1];
        if (right_vol >= ARRAY_SIZE(master_volume_table))
            right_vol = ARRAY_SIZE(master_volume_table) - 1;
        right_vol = master_volume_table[right_vol];
    }

    block[0] = (left_vol >> 16) & 0xff;
    block[1] = (left_vol >> 8)  & 0xff;
    block[2] = (left_vol >> 0)  & 0xff;

    block[3] = (right_vol >> 16) & 0xff;
    block[4] = (right_vol >> 8)  & 0xff;
    block[5] = (right_vol >> 0)  & 0xff;
  
    if (i2c_smbus_write_i2c_block_data(mix->i2c.client, TAS_REG_VOL, 6,
                       block) < 0) {
        snd_printk(KERN_ERR "failed to set volume \n");
        return -EINVAL;
    }
    DBG("(I) succeeded to set volume (%u, %u)\n", left_vol, right_vol);
    return 0;
}


/* output volume */
static int tumbler_info_master_volume(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_info *uinfo)
{
    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 2;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = ARRAY_SIZE(master_volume_table) - 1;
    return 0;
}

static int tumbler_get_master_volume(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix = chip->mixer_data;

    ucontrol->value.integer.value[0] = mix->master_vol[0];
    ucontrol->value.integer.value[1] = mix->master_vol[1];
    return 0;
}

static int tumbler_put_master_volume(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix = chip->mixer_data;
    unsigned int vol[2];
    int change;

    vol[0] = ucontrol->value.integer.value[0];
    vol[1] = ucontrol->value.integer.value[1];
    if (vol[0] >= ARRAY_SIZE(master_volume_table) ||
        vol[1] >= ARRAY_SIZE(master_volume_table))
        return -EINVAL;
    change = mix->master_vol[0] != vol[0] ||
        mix->master_vol[1] != vol[1];
    if (change) {
        mix->master_vol[0] = vol[0];
        mix->master_vol[1] = vol[1];
        tumbler_set_master_volume(mix);
    }
    return change;
}

/* output switch */
static int tumbler_get_master_switch(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix = chip->mixer_data;

    ucontrol->value.integer.value[0] = mix->master_switch[0];
    ucontrol->value.integer.value[1] = mix->master_switch[1];
    return 0;
}

static int tumbler_put_master_switch(struct snd_kcontrol *kcontrol,
                     struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix = chip->mixer_data;
    int change;

    change = mix->master_switch[0] != ucontrol->value.integer.value[0] ||
        mix->master_switch[1] != ucontrol->value.integer.value[1];
    if (change) {
        mix->master_switch[0] = !!ucontrol->value.integer.value[0];
        mix->master_switch[1] = !!ucontrol->value.integer.value[1];
        tumbler_set_master_volume(mix);
    }
    return change;
}


/*
 * TAS3001c dynamic range compression
 */

#define TAS3001_DRC_MAX     0x5f

static int tumbler_set_drc(struct pmac_tumbler *mix)
{
    unsigned char val[2];

    if (! mix->i2c.client)
        return -ENODEV;
  
    if (mix->drc_enable) {
        val[0] = 0xc1; /* enable, 3:1 compression */
        if (mix->drc_range > TAS3001_DRC_MAX)
            val[1] = 0xf0;
        else if (mix->drc_range < 0)
            val[1] = 0x91;
        else
            val[1] = mix->drc_range + 0x91;
    } else {
        val[0] = 0;
        val[1] = 0;
    }

    if (i2c_smbus_write_i2c_block_data(mix->i2c.client, TAS_REG_DRC,
                       2, val) < 0) {
        snd_printk(KERN_ERR "failed to set DRC\n");
        return -EINVAL;
    }
    DBG("(I) succeeded to set DRC (%u, %u)\n", val[0], val[1]);
    return 0;
}

/*
 * TAS3004
 */

#define TAS3004_DRC_MAX     0xef

static int snapper_set_drc(struct pmac_tumbler *mix)
{
    unsigned char val[6];

    if (! mix->i2c.client)
        return -ENODEV;
  
    if (mix->drc_enable)
        val[0] = 0x50; /* 3:1 above threshold */
    else
        val[0] = 0x51; /* disabled */
    val[1] = 0x02; /* 1:1 below threshold */
    if (mix->drc_range > 0xef)
        val[2] = 0xef;
    else if (mix->drc_range < 0)
        val[2] = 0x00;
    else
        val[2] = mix->drc_range;
    val[3] = 0xb0;
    val[4] = 0x60;
    val[5] = 0xa0;

    if (i2c_smbus_write_i2c_block_data(mix->i2c.client, TAS_REG_DRC,
                       6, val) < 0) {
        snd_printk(KERN_ERR "failed to set DRC\n");
        return -EINVAL;
    }
    DBG("(I) succeeded to set DRC (%u, %u)\n", val[0], val[1]);
    return 0;
}

static int tumbler_info_drc_value(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_info *uinfo)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 1;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max =
        chip->model == PMAC_TUMBLER ? TAS3001_DRC_MAX : TAS3004_DRC_MAX;
    return 0;
}

static int tumbler_get_drc_value(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    if (! (mix = chip->mixer_data))
        return -ENODEV;
    ucontrol->value.integer.value[0] = mix->drc_range;
    return 0;
}

static int tumbler_put_drc_value(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    unsigned int val;
    int change;

    if (! (mix = chip->mixer_data))
        return -ENODEV;
    val = ucontrol->value.integer.value[0];
    if (chip->model == PMAC_TUMBLER) {
        if (val > TAS3001_DRC_MAX)
            return -EINVAL;
    } else {
        if (val > TAS3004_DRC_MAX)
            return -EINVAL;
    }
    change = mix->drc_range != val;
    if (change) {
        mix->drc_range = val;
        if (chip->model == PMAC_TUMBLER)
            tumbler_set_drc(mix);
        else
            snapper_set_drc(mix);
    }
    return change;
}

static int tumbler_get_drc_switch(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    if (! (mix = chip->mixer_data))
        return -ENODEV;
    ucontrol->value.integer.value[0] = mix->drc_enable;
    return 0;
}

static int tumbler_put_drc_switch(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    int change;

    if (! (mix = chip->mixer_data))
        return -ENODEV;
    change = mix->drc_enable != ucontrol->value.integer.value[0];
    if (change) {
        mix->drc_enable = !!ucontrol->value.integer.value[0];
        if (chip->model == PMAC_TUMBLER)
            tumbler_set_drc(mix);
        else
            snapper_set_drc(mix);
    }
    return change;
}


/*
 * mono volumes
 */

struct tumbler_mono_vol {
    int index;
    int reg;
    int bytes;
    unsigned int max;
    unsigned int *table;
};

static int tumbler_set_mono_volume(struct pmac_tumbler *mix,
                   struct tumbler_mono_vol *info)
{
    unsigned char block[4];
    unsigned int vol;
    int i;
  
    if (! mix->i2c.client)
        return -ENODEV;
  
    vol = mix->mono_vol[info->index];
    if (vol >= info->max)
        vol = info->max - 1;
    vol = info->table[vol];
    for (i = 0; i < info->bytes; i++)
        block[i] = (vol >> ((info->bytes - i - 1) * 8)) & 0xff;
    if (i2c_smbus_write_i2c_block_data(mix->i2c.client, info->reg,
                       info->bytes, block) < 0) {
        snd_printk(KERN_ERR "failed to set mono volume %d\n",
               info->index);
        return -EINVAL;
    }
    return 0;
}

static int tumbler_info_mono(struct snd_kcontrol *kcontrol,
                 struct snd_ctl_elem_info *uinfo)
{
    struct tumbler_mono_vol *info = (struct tumbler_mono_vol *)kcontrol->private_value;

    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 1;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = info->max - 1;
    return 0;
}

static int tumbler_get_mono(struct snd_kcontrol *kcontrol,
                struct snd_ctl_elem_value *ucontrol)
{
    struct tumbler_mono_vol *info = (struct tumbler_mono_vol *)kcontrol->private_value;
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    if (! (mix = chip->mixer_data))
        return -ENODEV;
    ucontrol->value.integer.value[0] = mix->mono_vol[info->index];
    return 0;
}

static int tumbler_put_mono(struct snd_kcontrol *kcontrol,
                struct snd_ctl_elem_value *ucontrol)
{
    struct tumbler_mono_vol *info = (struct tumbler_mono_vol *)kcontrol->private_value;
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    unsigned int vol;
    int change;

    if (! (mix = chip->mixer_data))
        return -ENODEV;
    vol = ucontrol->value.integer.value[0];
    if (vol >= info->max)
        return -EINVAL;
    change = mix->mono_vol[info->index] != vol;
    if (change) {
        mix->mono_vol[info->index] = vol;
        tumbler_set_mono_volume(mix, info);
    }
    return change;
}

/* TAS3001c mono volumes */
static struct tumbler_mono_vol tumbler_pcm_vol_info = {
    .index = VOL_IDX_PCM_MONO,
    .reg = TAS_REG_PCM,
    .bytes = 3,
    .max = ARRAY_SIZE(mixer_volume_table),
    .table = mixer_volume_table,
};

static struct tumbler_mono_vol tumbler_bass_vol_info = {
    .index = VOL_IDX_BASS,
    .reg = TAS_REG_BASS,
    .bytes = 1,
    .max = ARRAY_SIZE(bass_volume_table),
    .table = bass_volume_table,
};

static struct tumbler_mono_vol tumbler_treble_vol_info = {
    .index = VOL_IDX_TREBLE,
    .reg = TAS_REG_TREBLE,
    .bytes = 1,
    .max = ARRAY_SIZE(treble_volume_table),
    .table = treble_volume_table,
};

/* TAS3004 mono volumes */
static struct tumbler_mono_vol snapper_bass_vol_info = {
    .index = VOL_IDX_BASS,
    .reg = TAS_REG_BASS,
    .bytes = 1,
    .max = ARRAY_SIZE(snapper_bass_volume_table),
    .table = snapper_bass_volume_table,
};

static struct tumbler_mono_vol snapper_treble_vol_info = {
    .index = VOL_IDX_TREBLE,
    .reg = TAS_REG_TREBLE,
    .bytes = 1,
    .max = ARRAY_SIZE(snapper_treble_volume_table),
    .table = snapper_treble_volume_table,
};


#define DEFINE_MONO(xname,type) { \
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,\
    .name = xname, \
    .info = tumbler_info_mono, \
    .get = tumbler_get_mono, \
    .put = tumbler_put_mono, \
    .private_value = (unsigned long)(&tumbler_##type##_vol_info), \
}

#define DEFINE_SNAPPER_MONO(xname,type) { \
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,\
    .name = xname, \
    .info = tumbler_info_mono, \
    .get = tumbler_get_mono, \
    .put = tumbler_put_mono, \
    .private_value = (unsigned long)(&snapper_##type##_vol_info), \
}


/*
 * snapper mixer volumes
 */

static int snapper_set_mix_vol1(struct pmac_tumbler *mix, int idx, int ch, int reg)
{
    int i, j, vol;
    unsigned char block[9];

    vol = mix->mix_vol[idx][ch];
    if (vol >= ARRAY_SIZE(mixer_volume_table)) {
        vol = ARRAY_SIZE(mixer_volume_table) - 1;
        mix->mix_vol[idx][ch] = vol;
    }

    for (i = 0; i < 3; i++) {
        vol = mix->mix_vol[i][ch];
        vol = mixer_volume_table[vol];
        for (j = 0; j < 3; j++)
            block[i * 3 + j] = (vol >> ((2 - j) * 8)) & 0xff;
    }
    if (i2c_smbus_write_i2c_block_data(mix->i2c.client, reg,
                       9, block) < 0) {
        snd_printk(KERN_ERR "failed to set mono volume %d\n", reg);
        return -EINVAL;
    }
    return 0;
}

static int snapper_set_mix_vol(struct pmac_tumbler *mix, int idx)
{
    if (! mix->i2c.client)
        return -ENODEV;
    if (snapper_set_mix_vol1(mix, idx, 0, TAS_REG_LMIX) < 0 ||
        snapper_set_mix_vol1(mix, idx, 1, TAS_REG_RMIX) < 0)
        return -EINVAL;
    return 0;
}

static int snapper_info_mix(struct snd_kcontrol *kcontrol,
                struct snd_ctl_elem_info *uinfo)
{
    uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
    uinfo->count = 2;
    uinfo->value.integer.min = 0;
    uinfo->value.integer.max = ARRAY_SIZE(mixer_volume_table) - 1;
    return 0;
}

static int snapper_get_mix(struct snd_kcontrol *kcontrol,
               struct snd_ctl_elem_value *ucontrol)
{
    int idx = (int)kcontrol->private_value;
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    if (! (mix = chip->mixer_data))
        return -ENODEV;
    ucontrol->value.integer.value[0] = mix->mix_vol[idx][0];
    ucontrol->value.integer.value[1] = mix->mix_vol[idx][1];
    return 0;
}

static int snapper_put_mix(struct snd_kcontrol *kcontrol,
               struct snd_ctl_elem_value *ucontrol)
{
    int idx = (int)kcontrol->private_value;
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    unsigned int vol[2];
    int change;

    if (! (mix = chip->mixer_data))
        return -ENODEV;
    vol[0] = ucontrol->value.integer.value[0];
    vol[1] = ucontrol->value.integer.value[1];
    if (vol[0] >= ARRAY_SIZE(mixer_volume_table) ||
        vol[1] >= ARRAY_SIZE(mixer_volume_table))
        return -EINVAL;
    change = mix->mix_vol[idx][0] != vol[0] ||
        mix->mix_vol[idx][1] != vol[1];
    if (change) {
        mix->mix_vol[idx][0] = vol[0];
        mix->mix_vol[idx][1] = vol[1];
        snapper_set_mix_vol(mix, idx);
    }
    return change;
}


/*
 * mute switches. FIXME: Turn that into software mute when both outputs are muted
 * to avoid codec reset on ibook M7
 */

enum { TUMBLER_MUTE_HP, TUMBLER_MUTE_AMP, TUMBLER_MUTE_LINE };

static int tumbler_get_mute_switch(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    struct pmac_gpio *gp;
    if (! (mix = chip->mixer_data))
        return -ENODEV;
    switch(kcontrol->private_value) {
    case TUMBLER_MUTE_HP:
        gp = &mix->hp_mute; break;
    case TUMBLER_MUTE_AMP:
        gp = &mix->amp_mute;    break;
    case TUMBLER_MUTE_LINE:
        gp = &mix->line_mute;   break;
    default:
        gp = NULL;
    }
    if (gp == NULL)
        return -EINVAL;
    ucontrol->value.integer.value[0] = !check_audio_gpio(gp);
    return 0;
}

static int tumbler_put_mute_switch(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix;
    struct pmac_gpio *gp;
    int val;
#ifdef PMAC_SUPPORT_AUTOMUTE
    if (chip->update_automute && chip->auto_mute)
        return 0; /* don't touch in the auto-mute mode */
#endif  
    if (! (mix = chip->mixer_data))
        return -ENODEV;
    switch(kcontrol->private_value) {
    case TUMBLER_MUTE_HP:
        gp = &mix->hp_mute; break;
    case TUMBLER_MUTE_AMP:
        gp = &mix->amp_mute;    break;
    case TUMBLER_MUTE_LINE:
        gp = &mix->line_mute;   break;
    default:
        gp = NULL;
    }
    if (gp == NULL)
        return -EINVAL;
    val = ! check_audio_gpio(gp);
    if (val != ucontrol->value.integer.value[0]) {
        write_audio_gpio(gp, ! ucontrol->value.integer.value[0]);
        return 1;
    }
    return 0;
}

static int snapper_set_capture_source(struct pmac_tumbler *mix)
{
    if (! mix->i2c.client)
        return -ENODEV;
    if (mix->capture_source)
        mix->acs |= 2;
    else
        mix->acs &= ~2;
    return i2c_smbus_write_byte_data(mix->i2c.client, TAS_REG_ACS, mix->acs);
}

static int snapper_info_capture_source(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_info *uinfo)
{
    static char *texts[2] = {
        "Line", "Mic"
    };
    uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
    uinfo->count = 1;
    uinfo->value.enumerated.items = 2;
    if (uinfo->value.enumerated.item > 1)
        uinfo->value.enumerated.item = 1;
    strcpy(uinfo->value.enumerated.name, texts[uinfo->value.enumerated.item]);
    return 0;
}

static int snapper_get_capture_source(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix = chip->mixer_data;

    ucontrol->value.enumerated.item[0] = mix->capture_source;
    return 0;
}

static int snapper_put_capture_source(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
    struct snd_pmac *chip = snd_kcontrol_chip(kcontrol);
    struct pmac_tumbler *mix = chip->mixer_data;
    int change;

    change = ucontrol->value.enumerated.item[0] != mix->capture_source;
    if (change) {
        mix->capture_source = !!ucontrol->value.enumerated.item[0];
        snapper_set_capture_source(mix);
    }
    return change;
}

#define DEFINE_SNAPPER_MIX(xname,idx,ofs) { \
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,\
    .name = xname, \
    .info = snapper_info_mix, \
    .get = snapper_get_mix, \
    .put = snapper_put_mix, \
    .index = idx,\
    .private_value = ofs, \
}


/*
 */
static struct snd_kcontrol_new tumbler_mixers[] __devinitdata = {
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Master Playback Volume",
      .info = tumbler_info_master_volume,
      .get = tumbler_get_master_volume,
      .put = tumbler_put_master_volume
    },
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Master Playback Switch",
      .info = snd_pmac_boolean_stereo_info,
      .get = tumbler_get_master_switch,
      .put = tumbler_put_master_switch
    },
    DEFINE_MONO("Tone Control - Bass", bass),
    DEFINE_MONO("Tone Control - Treble", treble),
    DEFINE_MONO("PCM Playback Volume", pcm),
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "DRC Range",
      .info = tumbler_info_drc_value,
      .get = tumbler_get_drc_value,
      .put = tumbler_put_drc_value
    },
};

static struct snd_kcontrol_new snapper_mixers[] __devinitdata = {
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Master Playback Volume",
      .info = tumbler_info_master_volume,
      .get = tumbler_get_master_volume,
      .put = tumbler_put_master_volume
    },
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Master Playback Switch",
      .info = snd_pmac_boolean_stereo_info,
      .get = tumbler_get_master_switch,
      .put = tumbler_put_master_switch
    },
    DEFINE_SNAPPER_MIX("PCM Playback Volume", 0, VOL_IDX_PCM),
    /* Alternative PCM is assigned to Mic analog loopback on iBook G4 */
    DEFINE_SNAPPER_MIX("Mic Playback Volume", 0, VOL_IDX_PCM2),
    DEFINE_SNAPPER_MIX("Monitor Mix Volume", 0, VOL_IDX_ADC),
    DEFINE_SNAPPER_MONO("Tone Control - Bass", bass),
    DEFINE_SNAPPER_MONO("Tone Control - Treble", treble),
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "DRC Range",
      .info = tumbler_info_drc_value,
      .get = tumbler_get_drc_value,
      .put = tumbler_put_drc_value
    },
    { .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Input Source", /* FIXME: "Capture Source" doesn't work properly */
      .info = snapper_info_capture_source,
      .get = snapper_get_capture_source,
      .put = snapper_put_capture_source
    },
};

static struct snd_kcontrol_new tumbler_hp_sw __devinitdata = {
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
    .name = "Headphone Playback Switch",
    .info = snd_pmac_boolean_mono_info,
    .get = tumbler_get_mute_switch,
    .put = tumbler_put_mute_switch,
    .private_value = TUMBLER_MUTE_HP,
};
static struct snd_kcontrol_new tumbler_speaker_sw __devinitdata = {
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
    .name = "Speaker Playback Switch",
    .info = snd_pmac_boolean_mono_info,
    .get = tumbler_get_mute_switch,
    .put = tumbler_put_mute_switch,
    .private_value = TUMBLER_MUTE_AMP,
};
static struct snd_kcontrol_new tumbler_lineout_sw __devinitdata = {
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
    .name = "Line Out Playback Switch",
    .info = snd_pmac_boolean_mono_info,
    .get = tumbler_get_mute_switch,
    .put = tumbler_put_mute_switch,
    .private_value = TUMBLER_MUTE_LINE,
};
static struct snd_kcontrol_new tumbler_drc_sw __devinitdata = {
    .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
    .name = "DRC Switch",
    .info = snd_pmac_boolean_mono_info,
    .get = tumbler_get_drc_switch,
    .put = tumbler_put_drc_switch
};


#ifdef PMAC_SUPPORT_AUTOMUTE
/*
 * auto-mute stuffs
 */
static int tumbler_detect_headphone(struct snd_pmac *chip)
{
    struct pmac_tumbler *mix = chip->mixer_data;
    int detect = 0;

    if (mix->hp_detect.addr)
        detect |= read_audio_gpio(&mix->hp_detect);
    return detect;
}

static int tumbler_detect_lineout(struct snd_pmac *chip)
{
    struct pmac_tumbler *mix = chip->mixer_data;
    int detect = 0;

    if (mix->line_detect.addr)
        detect |= read_audio_gpio(&mix->line_detect);
    return detect;
}

static void check_mute(struct snd_pmac *chip, struct pmac_gpio *gp, int val, int do_notify,
               struct snd_kcontrol *sw)
{
    if (check_audio_gpio(gp) != val) {
        write_audio_gpio(gp, val);
        if (do_notify)
            snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                       &sw->id);
    }
}

static struct work_struct device_change;
static struct snd_pmac *device_change_chip;

static void device_change_handler(struct work_struct *work)
{
    struct snd_pmac *chip = device_change_chip;
    struct pmac_tumbler *mix;
    int headphone, lineout;

    if (!chip)
        return;

    mix = chip->mixer_data;
    if (snd_BUG_ON(!mix))
        return;

    headphone = tumbler_detect_headphone(chip);
    lineout = tumbler_detect_lineout(chip);

    DBG("headphone: %d, lineout: %d\n", headphone, lineout);

    if (headphone || lineout) {
        /* unmute headphone/lineout & mute speaker */
        if (headphone)
            check_mute(chip, &mix->hp_mute, 0, mix->auto_mute_notify,
                   chip->master_sw_ctl);
        if (lineout && mix->line_mute.addr != 0)
            check_mute(chip, &mix->line_mute, 0, mix->auto_mute_notify,
                   chip->lineout_sw_ctl);
        if (mix->anded_reset)
            msleep(10);
        check_mute(chip, &mix->amp_mute, !IS_G4DA, mix->auto_mute_notify,
               chip->speaker_sw_ctl);
    } else {
        /* unmute speaker, mute others */
        check_mute(chip, &mix->amp_mute, 0, mix->auto_mute_notify,
               chip->speaker_sw_ctl);
        if (mix->anded_reset)
            msleep(10);
        check_mute(chip, &mix->hp_mute, 1, mix->auto_mute_notify,
               chip->master_sw_ctl);
        if (mix->line_mute.addr != 0)
            check_mute(chip, &mix->line_mute, 1, mix->auto_mute_notify,
                   chip->lineout_sw_ctl);
    }
    if (mix->auto_mute_notify)
        snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                       &chip->hp_detect_ctl->id);

#ifdef CONFIG_SND_POWERMAC_AUTO_DRC
    mix->drc_enable = ! (headphone || lineout);
    if (mix->auto_mute_notify)
        snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                   &chip->drc_sw_ctl->id);
    if (chip->model == PMAC_TUMBLER)
        tumbler_set_drc(mix);
    else
        snapper_set_drc(mix);
#endif

    /* reset the master volume so the correct amplification is applied */
    tumbler_set_master_volume(mix);
}

static void tumbler_update_automute(struct snd_pmac *chip, int do_notify)
{
    if (chip->auto_mute) {
        struct pmac_tumbler *mix;
        mix = chip->mixer_data;
        if (snd_BUG_ON(!mix))
            return;
        mix->auto_mute_notify = do_notify;
        schedule_work(&device_change);
    }
}
#endif /* PMAC_SUPPORT_AUTOMUTE */


/* interrupt - headphone plug changed */
static irqreturn_t headphone_intr(int irq, void *devid)
{
    struct snd_pmac *chip = devid;
    if (chip->update_automute && chip->initialized) {
        chip->update_automute(chip, 1);
        return IRQ_HANDLED;
    }
    return IRQ_NONE;
}

/* look for audio-gpio device */
static struct device_node *find_audio_device(const char *name)
{
    struct device_node *gpiop;
    struct device_node *np;
  
    gpiop = of_find_node_by_name(NULL, "gpio");
    if (! gpiop)
        return NULL;
  
    for (np = of_get_next_child(gpiop, NULL); np;
            np = of_get_next_child(gpiop, np)) {
        const char *property = of_get_property(np, "audio-gpio", NULL);
        if (property && strcmp(property, name) == 0)
            break;
    }  
    of_node_put(gpiop);
    return np;
}

/* look for audio-gpio device */
static struct device_node *find_compatible_audio_device(const char *name)
{
    struct device_node *gpiop;
    struct device_node *np;
  
    gpiop = of_find_node_by_name(NULL, "gpio");
    if (!gpiop)
        return NULL;
  
    for (np = of_get_next_child(gpiop, NULL); np;
            np = of_get_next_child(gpiop, np)) {
        if (of_device_is_compatible(np, name))
            break;
    }  
    of_node_put(gpiop);
    return np;
}

/* find an audio device and get its address */
static long tumbler_find_device(const char *device, const char *platform,
                struct pmac_gpio *gp, int is_compatible)
{
    struct device_node *node;
    const u32 *base;
    u32 addr;
    long ret;

    if (is_compatible)
        node = find_compatible_audio_device(device);
    else
        node = find_audio_device(device);
    if (! node) {
        DBG("(W) cannot find audio device %s !\n", device);
        snd_printdd("cannot find device %s\n", device);
        return -ENODEV;
    }

    base = of_get_property(node, "AAPL,address", NULL);
    if (! base) {
        base = of_get_property(node, "reg", NULL);
        if (!base) {
            DBG("(E) cannot find address for device %s !\n", device);
            snd_printd("cannot find address for device %s\n", device);
            of_node_put(node);
            return -ENODEV;
        }
        addr = *base;
        if (addr < 0x50)
            addr += 0x50;
    } else
        addr = *base;

    gp->addr = addr & 0x0000ffff;
    /* Try to find the active state, default to 0 ! */
    base = of_get_property(node, "audio-gpio-active-state", NULL);
    if (base) {
        gp->active_state = *base;
        gp->active_val = (*base) ? 0x5 : 0x4;
        gp->inactive_val = (*base) ? 0x4 : 0x5;
    } else {
        const u32 *prop = NULL;
        gp->active_state = IS_G4DA
                && !strncmp(device, "keywest-gpio1", 13);
        gp->active_val = 0x4;
        gp->inactive_val = 0x5;
        /* Here are some crude hacks to extract the GPIO polarity and
         * open collector informations out of the do-platform script
         * as we don't yet have an interpreter for these things
         */
        if (platform)
            prop = of_get_property(node, platform, NULL);
        if (prop) {
            if (prop[3] == 0x9 && prop[4] == 0x9) {
                gp->active_val = 0xd;
                gp->inactive_val = 0xc;
            }
            if (prop[3] == 0x1 && prop[4] == 0x1) {
                gp->active_val = 0x5;
                gp->inactive_val = 0x4;
            }
        }
    }

    DBG("(I) GPIO device %s found, offset: %x, active state: %d !\n",
        device, gp->addr, gp->active_state);

    ret = irq_of_parse_and_map(node, 0);
    of_node_put(node);
    return ret;
}

/* reset audio */
static void tumbler_reset_audio(struct snd_pmac *chip)
{
    struct pmac_tumbler *mix = chip->mixer_data;

    if (mix->anded_reset) {
        DBG("(I) codec anded reset !\n");
        write_audio_gpio(&mix->hp_mute, 0);
        write_audio_gpio(&mix->amp_mute, 0);
        msleep(200);
        write_audio_gpio(&mix->hp_mute, 1);
        write_audio_gpio(&mix->amp_mute, 1);
        msleep(100);
        write_audio_gpio(&mix->hp_mute, 0);
        write_audio_gpio(&mix->amp_mute, 0);
        msleep(100);
    } else {
        DBG("(I) codec normal reset !\n");

        write_audio_gpio(&mix->audio_reset, 0);
        msleep(200);
        write_audio_gpio(&mix->audio_reset, 1);
        msleep(100);
        write_audio_gpio(&mix->audio_reset, 0);
        msleep(100);
    }
}

#ifdef CONFIG_PM
/* suspend mixer */
static void tumbler_suspend(struct snd_pmac *chip)
{
    struct pmac_tumbler *mix = chip->mixer_data;

    if (mix->headphone_irq >= 0)
        disable_irq(mix->headphone_irq);
    if (mix->lineout_irq >= 0)
        disable_irq(mix->lineout_irq);
    mix->save_master_switch[0] = mix->master_switch[0];
    mix->save_master_switch[1] = mix->master_switch[1];
    mix->save_master_vol[0] = mix->master_vol[0];
    mix->save_master_vol[1] = mix->master_vol[1];
    mix->master_switch[0] = mix->master_switch[1] = 0;
    tumbler_set_master_volume(mix);
    if (!mix->anded_reset) {
        write_audio_gpio(&mix->amp_mute, 1);
        write_audio_gpio(&mix->hp_mute, 1);
    }
    if (chip->model == PMAC_SNAPPER) {
        mix->acs |= 1;
        i2c_smbus_write_byte_data(mix->i2c.client, TAS_REG_ACS, mix->acs);
    }
    if (mix->anded_reset) {
        write_audio_gpio(&mix->amp_mute, 1);
        write_audio_gpio(&mix->hp_mute, 1);
    } else
        write_audio_gpio(&mix->audio_reset, 1);
}

/* resume mixer */
static void tumbler_resume(struct snd_pmac *chip)
{
    struct pmac_tumbler *mix = chip->mixer_data;

    mix->acs &= ~1;
    mix->master_switch[0] = mix->save_master_switch[0];
    mix->master_switch[1] = mix->save_master_switch[1];
    mix->master_vol[0] = mix->save_master_vol[0];
    mix->master_vol[1] = mix->save_master_vol[1];
    tumbler_reset_audio(chip);
    if (mix->i2c.client && mix->i2c.init_client) {
        if (mix->i2c.init_client(&mix->i2c) < 0)
            printk(KERN_ERR "tumbler_init_client error\n");
    } else
        printk(KERN_ERR "tumbler: i2c is not initialized\n");
    if (chip->model == PMAC_TUMBLER) {
        tumbler_set_mono_volume(mix, &tumbler_pcm_vol_info);
        tumbler_set_mono_volume(mix, &tumbler_bass_vol_info);
        tumbler_set_mono_volume(mix, &tumbler_treble_vol_info);
        tumbler_set_drc(mix);
    } else {
        snapper_set_mix_vol(mix, VOL_IDX_PCM);
        snapper_set_mix_vol(mix, VOL_IDX_PCM2);
        snapper_set_mix_vol(mix, VOL_IDX_ADC);
        tumbler_set_mono_volume(mix, &snapper_bass_vol_info);
        tumbler_set_mono_volume(mix, &snapper_treble_vol_info);
        snapper_set_drc(mix);
        snapper_set_capture_source(mix);
    }
    tumbler_set_master_volume(mix);
    if (chip->update_automute)
        chip->update_automute(chip, 0);
    if (mix->headphone_irq >= 0) {
        unsigned char val;

        enable_irq(mix->headphone_irq);
        /* activate headphone status interrupts */
        val = do_gpio_read(&mix->hp_detect);
        do_gpio_write(&mix->hp_detect, val | 0x80);
    }
    if (mix->lineout_irq >= 0)
        enable_irq(mix->lineout_irq);
}
#endif

/* initialize tumbler */
static int __devinit tumbler_init(struct snd_pmac *chip)
{
    int irq;
    struct pmac_tumbler *mix = chip->mixer_data;

    if (tumbler_find_device("audio-hw-reset",
                "platform-do-hw-reset",
                &mix->audio_reset, 0) < 0)
        tumbler_find_device("hw-reset",
                    "platform-do-hw-reset",
                    &mix->audio_reset, 1);
    if (tumbler_find_device("amp-mute",
                "platform-do-amp-mute",
                &mix->amp_mute, 0) < 0)
        tumbler_find_device("amp-mute",
                    "platform-do-amp-mute",
                    &mix->amp_mute, 1);
    if (tumbler_find_device("headphone-mute",
                "platform-do-headphone-mute",
                &mix->hp_mute, 0) < 0)
        tumbler_find_device("headphone-mute",
                    "platform-do-headphone-mute",
                    &mix->hp_mute, 1);
    if (tumbler_find_device("line-output-mute",
                "platform-do-lineout-mute",
                &mix->line_mute, 0) < 0)
        tumbler_find_device("line-output-mute",
                   "platform-do-lineout-mute",
                    &mix->line_mute, 1);
    irq = tumbler_find_device("headphone-detect",
                  NULL, &mix->hp_detect, 0);
    if (irq <= NO_IRQ)
        irq = tumbler_find_device("headphone-detect",
                      NULL, &mix->hp_detect, 1);
    if (irq <= NO_IRQ)
        irq = tumbler_find_device("keywest-gpio15",
                      NULL, &mix->hp_detect, 1);
    mix->headphone_irq = irq;
    irq = tumbler_find_device("line-output-detect",
                  NULL, &mix->line_detect, 0);
    if (irq <= NO_IRQ)
        irq = tumbler_find_device("line-output-detect",
                      NULL, &mix->line_detect, 1);
    if (IS_G4DA && irq <= NO_IRQ)
        irq = tumbler_find_device("keywest-gpio16",
                      NULL, &mix->line_detect, 1);
    mix->lineout_irq = irq;

    tumbler_reset_audio(chip);
  
    return 0;
}

static void tumbler_cleanup(struct snd_pmac *chip)
{
    struct pmac_tumbler *mix = chip->mixer_data;
    if (! mix)
        return;

    if (mix->headphone_irq >= 0)
        free_irq(mix->headphone_irq, chip);
    if (mix->lineout_irq >= 0)
        free_irq(mix->lineout_irq, chip);
    tumbler_gpio_free(&mix->audio_reset);
    tumbler_gpio_free(&mix->amp_mute);
    tumbler_gpio_free(&mix->hp_mute);
    tumbler_gpio_free(&mix->hp_detect);
    snd_pmac_keywest_cleanup(&mix->i2c);
    kfree(mix);
    chip->mixer_data = NULL;
}

/* exported */
int __devinit snd_pmac_tumbler_init(struct snd_pmac *chip)
{
    int i, err;
    struct pmac_tumbler *mix;
    const u32 *paddr;
    struct device_node *tas_node, *np;
    char *chipname;

    request_module("i2c-powermac");

    mix = kzalloc(sizeof(*mix), GFP_KERNEL);
    if (! mix)
        return -ENOMEM;
    mix->headphone_irq = -1;

    chip->mixer_data = mix;
    chip->mixer_free = tumbler_cleanup;
    mix->anded_reset = 0;
    mix->reset_on_sleep = 1;

    for (np = chip->node->child; np; np = np->sibling) {
        if (!strcmp(np->name, "sound")) {
            if (of_get_property(np, "has-anded-reset", NULL))
                mix->anded_reset = 1;
            if (of_get_property(np, "layout-id", NULL))
                mix->reset_on_sleep = 0;
            break;
        }
    }
    if ((err = tumbler_init(chip)) < 0)
        return err;

    /* set up TAS */
    tas_node = of_find_node_by_name(NULL, "deq");
    if (tas_node == NULL)
        tas_node = of_find_node_by_name(NULL, "codec");
    if (tas_node == NULL)
        return -ENODEV;

    paddr = of_get_property(tas_node, "i2c-address", NULL);
    if (paddr == NULL)
        paddr = of_get_property(tas_node, "reg", NULL);
    if (paddr)
        mix->i2c.addr = (*paddr) >> 1;
    else
        mix->i2c.addr = TAS_I2C_ADDR;
    of_node_put(tas_node);

    DBG("(I) TAS i2c address is: %x\n", mix->i2c.addr);

    if (chip->model == PMAC_TUMBLER) {
        mix->i2c.init_client = tumbler_init_client;
        mix->i2c.name = "TAS3001c";
        chipname = "Tumbler";
    } else {
        mix->i2c.init_client = snapper_init_client;
        mix->i2c.name = "TAS3004";
        chipname = "Snapper";
    }

    if ((err = snd_pmac_keywest_init(&mix->i2c)) < 0)
        return err;

    /*
     * build mixers
     */
    sprintf(chip->card->mixername, "PowerMac %s", chipname);

    if (chip->model == PMAC_TUMBLER) {
        for (i = 0; i < ARRAY_SIZE(tumbler_mixers); i++) {
            if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&tumbler_mixers[i], chip))) < 0)
                return err;
        }
    } else {
        for (i = 0; i < ARRAY_SIZE(snapper_mixers); i++) {
            if ((err = snd_ctl_add(chip->card, snd_ctl_new1(&snapper_mixers[i], chip))) < 0)
                return err;
        }
    }
    chip->master_sw_ctl = snd_ctl_new1(&tumbler_hp_sw, chip);
    if ((err = snd_ctl_add(chip->card, chip->master_sw_ctl)) < 0)
        return err;
    chip->speaker_sw_ctl = snd_ctl_new1(&tumbler_speaker_sw, chip);
    if ((err = snd_ctl_add(chip->card, chip->speaker_sw_ctl)) < 0)
        return err;
    if (mix->line_mute.addr != 0) {
        chip->lineout_sw_ctl = snd_ctl_new1(&tumbler_lineout_sw, chip);
        if ((err = snd_ctl_add(chip->card, chip->lineout_sw_ctl)) < 0)
            return err;
    }
    chip->drc_sw_ctl = snd_ctl_new1(&tumbler_drc_sw, chip);
    if ((err = snd_ctl_add(chip->card, chip->drc_sw_ctl)) < 0)
        return err;

    /* set initial DRC range to 60% */
    if (chip->model == PMAC_TUMBLER)
        mix->drc_range = (TAS3001_DRC_MAX * 6) / 10;
    else
        mix->drc_range = (TAS3004_DRC_MAX * 6) / 10;
    mix->drc_enable = 1; /* will be changed later if AUTO_DRC is set */
    if (chip->model == PMAC_TUMBLER)
        tumbler_set_drc(mix);
    else
        snapper_set_drc(mix);

#ifdef CONFIG_PM
    chip->suspend = tumbler_suspend;
    chip->resume = tumbler_resume;
#endif

    INIT_WORK(&device_change, device_change_handler);
    device_change_chip = chip;

#ifdef PMAC_SUPPORT_AUTOMUTE
    if ((mix->headphone_irq >=0 || mix->lineout_irq >= 0)
        && (err = snd_pmac_add_automute(chip)) < 0)
        return err;
    chip->detect_headphone = tumbler_detect_headphone;
    chip->update_automute = tumbler_update_automute;
    tumbler_update_automute(chip, 0); /* update the status only */

    /* activate headphone status interrupts */
    if (mix->headphone_irq >= 0) {
        unsigned char val;
        if ((err = request_irq(mix->headphone_irq, headphone_intr, 0,
                       "Sound Headphone Detection", chip)) < 0)
            return 0;
        /* activate headphone status interrupts */
        val = do_gpio_read(&mix->hp_detect);
        do_gpio_write(&mix->hp_detect, val | 0x80);
    }
    if (mix->lineout_irq >= 0) {
        unsigned char val;
        if ((err = request_irq(mix->lineout_irq, headphone_intr, 0,
                       "Sound Lineout Detection", chip)) < 0)
            return 0;
        /* activate headphone status interrupts */
        val = do_gpio_read(&mix->line_detect);
        do_gpio_write(&mix->line_detect, val | 0x80);
    }
#endif

    return 0;
}