/*
   * PMac Tumbler/Snapper lowlevel functions
   *
   * Copyright (c) by Takashi Iwai <tiwai@suse.de>
   *
   *   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 <rene.rebe@gmx.net>:
   *     * 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 <linux/of_irq.h>

  #include <linux/io.h>

  #include <sound/core.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
  ", 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
  ");

  	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
  ");

  	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
  ", 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 
  ");

  		return -EINVAL;
  	}

  	DBG("(I) succeeded to set volume (%u, %u)
  ", 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
  ");

  		return -EINVAL;
  	}

  	DBG("(I) succeeded to set DRC (%u, %u)
  ", 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
  ");

  		return -EINVAL;
  	}

  	DBG("(I) succeeded to set DRC (%u, %u)
  ", 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
  ",
  			   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
  ", 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 const char * const texts[2] = {

  		"Line", "Mic"
  	};

  
  	return snd_ctl_enum_info(uinfo, 1, 2, texts);

  }

  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[] = {

  	{ .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[] = {

  	{ .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 = {

  	.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 = {

  	.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 = {

  	.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 = {

  	.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
  ", 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 !
  ", device);

  		snd_printdd("cannot find device %s
  ", 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 !
  ", device);

  			snd_printd("cannot find address for device %s
  ", 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 !
  ",
  	    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 !
  ");

  		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 !
  ");

  		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
  ");
  	} else
  		printk(KERN_ERR "tumbler: i2c is not initialized
  ");
  	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 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 <= 0)

  		irq = tumbler_find_device("headphone-detect",
  					  NULL, &mix->hp_detect, 1);

  	if (irq <= 0)

  		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 <= 0)

  		irq = tumbler_find_device("line-output-detect",
  					  NULL, &mix->line_detect, 1);

  	if (IS_G4DA && irq <= 0)

  		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 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
  ", 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;
  }