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tumbler.c

/*
 * 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 <sound/driver.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <linux/kmod.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <sound/core.h>
#include <asm/io.h>
#include <asm/irq.h>
#ifdef CONFIG_PPC_HAS_FEATURE_CALLS
#include <asm/pmac_feature.h>
#endif
#include "pmac.h"
#include "tumbler_volume.h"

/* 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
};

typedef struct pmac_gpio {
#ifdef CONFIG_PPC_HAS_FEATURE_CALLS
      unsigned int addr;
#else
      void __iomem *addr;
#endif
      int active_state;
} pmac_gpio_t;

typedef struct pmac_tumbler_t {
      pmac_keywest_t i2c;
      pmac_gpio_t audio_reset;
      pmac_gpio_t amp_mute;
      pmac_gpio_t hp_mute;
      pmac_gpio_t hp_detect;
      int headphone_irq;
      unsigned int master_vol[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;
} pmac_tumbler_t;


/*
 */

static int send_init_client(pmac_keywest_t *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;
                  mdelay(10);
            } while (count--);
            if (err < 0)
                  return -ENXIO;
            regs += 2;
      }
      return 0;
}


static int tumbler_init_client(pmac_keywest_t *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 */
      };
      return send_init_client(i2c, regs);
}

static int snapper_init_client(pmac_keywest_t *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 */
      };
      return send_init_client(i2c, regs);
}
      
/*
 * gpio access
 */
#ifdef CONFIG_PPC_HAS_FEATURE_CALLS
#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 */
#else
#define do_gpio_write(gp, val)      writeb(val, (gp)->addr)
#define do_gpio_read(gp)      readb((gp)->addr)
static inline void tumbler_gpio_free(pmac_gpio_t *gp)
{
      if (gp->addr) {
            iounmap(gp->addr);
            gp->addr = NULL;
      }
}
#endif /* CONFIG_PPC_HAS_FEATURE_CALLS */

static void write_audio_gpio(pmac_gpio_t *gp, int active)
{
      if (! gp->addr)
            return;
      active = active ? gp->active_state : !gp->active_state;
      do_gpio_write(gp, active ? 0x05 : 0x04);
}

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

/*
 * update master volume
 */
static int tumbler_set_master_volume(pmac_tumbler_t *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_block_data(mix->i2c.client, TAS_REG_VOL,
                               6, block) < 0) {
            snd_printk("failed to set volume \n");
            return -EINVAL;
      }
      return 0;
}


/* output volume */
static int tumbler_info_master_volume(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix = chip->mixer_data;
      snd_assert(mix, return -ENODEV);
      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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix = chip->mixer_data;
      int change;

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

/* output switch */
static int tumbler_get_master_switch(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix = chip->mixer_data;
      snd_assert(mix, return -ENODEV);
      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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix = chip->mixer_data;
      int change;

      snd_assert(mix, return -ENODEV);
      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(pmac_tumbler_t *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_block_data(mix->i2c.client, TAS_REG_DRC,
                               2, val) < 0) {
            snd_printk("failed to set DRC\n");
            return -EINVAL;
      }
      return 0;
}

/*
 * TAS3004
 */

#define TAS3004_DRC_MAX       0xef

static int snapper_set_drc(pmac_tumbler_t *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_block_data(mix->i2c.client, TAS_REG_DRC,
                               6, val) < 0) {
            snd_printk("failed to set DRC\n");
            return -EINVAL;
      }
      return 0;
}

static int tumbler_info_drc_value(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
{
      pmac_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      if (! (mix = chip->mixer_data))
            return -ENODEV;
      ucontrol->value.integer.value[0] = mix->drc_range;
      return 0;
}

static int tumbler_put_drc_value(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      int change;

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

static int tumbler_get_drc_switch(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      if (! (mix = chip->mixer_data))
            return -ENODEV;
      ucontrol->value.integer.value[0] = mix->drc_enable;
      return 0;
}

static int tumbler_put_drc_switch(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *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(pmac_tumbler_t *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_block_data(mix->i2c.client, info->reg,
                               info->bytes, block) < 0) {
            snd_printk("failed to set mono volume %d\n", info->index);
            return -EINVAL;
      }
      return 0;
}

static int tumbler_info_mono(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      struct tumbler_mono_vol *info = (struct tumbler_mono_vol *)kcontrol->private_value;
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      struct tumbler_mono_vol *info = (struct tumbler_mono_vol *)kcontrol->private_value;
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      int change;

      if (! (mix = chip->mixer_data))
            return -ENODEV;
      change = mix->mono_vol[info->index] != ucontrol->value.integer.value[0];
      if (change) {
            mix->mono_vol[info->index] = ucontrol->value.integer.value[0];
            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(pmac_tumbler_t *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_block_data(mix->i2c.client, reg, 9, block) < 0) {
            snd_printk("failed to set mono volume %d\n", reg);
            return -EINVAL;
      }
      return 0;
}

static int snapper_set_mix_vol(pmac_tumbler_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      int idx = (int)kcontrol->private_value;
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      int idx = (int)kcontrol->private_value;
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      int change;

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


/*
 * mute switches
 */

enum { TUMBLER_MUTE_HP, TUMBLER_MUTE_AMP };

static int tumbler_get_mute_switch(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      pmac_gpio_t *gp;
      if (! (mix = chip->mixer_data))
            return -ENODEV;
      gp = (kcontrol->private_value == TUMBLER_MUTE_HP) ? &mix->hp_mute : &mix->amp_mute;
      ucontrol->value.integer.value[0] = ! read_audio_gpio(gp);
      return 0;
}

static int tumbler_put_mute_switch(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix;
      pmac_gpio_t *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;
      gp = (kcontrol->private_value == TUMBLER_MUTE_HP) ? &mix->hp_mute : &mix->amp_mute;
      val = ! read_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(pmac_tumbler_t *mix)
{
      if (! mix->i2c.client)
            return -ENODEV;
      return i2c_smbus_write_byte_data(mix->i2c.client, TAS_REG_ACS,
                               mix->capture_source ? 2 : 0);
}

static int snapper_info_capture_source(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *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(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix = chip->mixer_data;

      snd_assert(mix, return -ENODEV);
      ucontrol->value.integer.value[0] = mix->capture_source;
      return 0;
}

static int snapper_put_capture_source(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucontrol)
{
      pmac_t *chip = snd_kcontrol_chip(kcontrol);
      pmac_tumbler_t *mix = chip->mixer_data;
      int change;

      snd_assert(mix, return -ENODEV);
      change = ucontrol->value.integer.value[0] != mix->capture_source;
      if (change) {
            mix->capture_source = !!ucontrol->value.integer.value[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 snd_kcontrol_new_t tumbler_mixers[] __initdata = {
      { .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 snd_kcontrol_new_t snapper_mixers[] __initdata = {
      { .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),
      DEFINE_SNAPPER_MIX("PCM Playback Volume", 1, 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 snd_kcontrol_new_t tumbler_hp_sw __initdata = {
      .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 snd_kcontrol_new_t tumbler_speaker_sw __initdata = {
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "PC 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 snd_kcontrol_new_t tumbler_drc_sw __initdata = {
      .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(pmac_t *chip)
{
      pmac_tumbler_t *mix = chip->mixer_data;
      return read_audio_gpio(&mix->hp_detect);
}

static void check_mute(pmac_t *chip, pmac_gpio_t *gp, int val, int do_notify, snd_kcontrol_t *sw)
{
      //pmac_tumbler_t *mix = chip->mixer_data;
      if (val != read_audio_gpio(gp)) {
            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 void
device_change_handler(void *self)
{
      pmac_t *chip = (pmac_t*) self;
      pmac_tumbler_t *mix;

      if (!chip)
            return;

      mix = chip->mixer_data;

      /* first set the DRC so the speaker do not explode -ReneR */
      if (chip->model == PMAC_TUMBLER)
            tumbler_set_drc(mix);
      else
            snapper_set_drc(mix);

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

static void tumbler_update_automute(pmac_t *chip, int do_notify)
{
      if (chip->auto_mute) {
            pmac_tumbler_t *mix = chip->mixer_data;
            snd_assert(mix, return);
            if (tumbler_detect_headphone(chip)) {
                  /* mute speaker */
                  check_mute(chip, &mix->amp_mute, 1, do_notify, chip->speaker_sw_ctl);
                  check_mute(chip, &mix->hp_mute, 0, do_notify, chip->master_sw_ctl);
                  mix->drc_enable = 0;

            } else {
                  /* unmute speaker */
                  check_mute(chip, &mix->amp_mute, 0, do_notify, chip->speaker_sw_ctl);
                  check_mute(chip, &mix->hp_mute, 1, do_notify, chip->master_sw_ctl);
                  mix->drc_enable = 1;
            }
            if (do_notify) {
                  snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                               &chip->hp_detect_ctl->id);
                  snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                                 &chip->drc_sw_ctl->id);
            }

            /* finally we need to schedule an update of the mixer values
               (master and DRC are enough for now) -ReneR */
            schedule_work(&device_change);

      }
}
#endif /* PMAC_SUPPORT_AUTOMUTE */


/* interrupt - headphone plug changed */
static irqreturn_t headphone_intr(int irq, void *devid, struct pt_regs *regs)
{
      pmac_t *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 *np;
  
      if (! (np = find_devices("gpio")))
            return NULL;
  
      for (np = np->child; np; np = np->sibling) {
            char *property = get_property(np, "audio-gpio", NULL);
            if (property && strcmp(property, name) == 0)
                  return np;
      }  
      return NULL;
}

/* look for audio-gpio device */
static struct device_node *find_compatible_audio_device(const char *name)
{
      struct device_node *np;
  
      if (! (np = find_devices("gpio")))
            return NULL;
  
      for (np = np->child; np; np = np->sibling) {
            if (device_is_compatible(np, name))
                  return np;
      }  
      return NULL;
}

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

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

      base = (u32 *)get_property(node, "AAPL,address", NULL);
      if (! base) {
            snd_printd("cannot find address for device %s\n", device);
            return -ENODEV;
      }

#ifdef CONFIG_PPC_HAS_FEATURE_CALLS
      gp->addr = (*base) & 0x0000ffff;
#else
      gp->addr = ioremap((unsigned long)(*base), 1);
#endif
      base = (u32 *)get_property(node, "audio-gpio-active-state", NULL);
      if (base)
            gp->active_state = *base;
      else
            gp->active_state = 1;


      return (node->n_intrs > 0) ? node->intrs[0].line : 0;
}

/* reset audio */
static void tumbler_reset_audio(pmac_t *chip)
{
      pmac_tumbler_t *mix = chip->mixer_data;

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

#ifdef CONFIG_PMAC_PBOOK
/* resume mixer */
static void tumbler_resume(pmac_t *chip)
{
      pmac_tumbler_t *mix = chip->mixer_data;

      snd_assert(mix, return);

      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);
}
#endif

/* initialize tumbler */
static int __init tumbler_init(pmac_t *chip)
{
      int irq, err;
      pmac_tumbler_t *mix = chip->mixer_data;
      snd_assert(mix, return -EINVAL);

      tumbler_find_device("audio-hw-reset", &mix->audio_reset, 0);
      tumbler_find_device("amp-mute", &mix->amp_mute, 0);
      tumbler_find_device("headphone-mute", &mix->hp_mute, 0);
      irq = tumbler_find_device("headphone-detect", &mix->hp_detect, 0);
      if (irq < 0)
            irq = tumbler_find_device("keywest-gpio15", &mix->hp_detect, 1);

      tumbler_reset_audio(chip);

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

static void tumbler_cleanup(pmac_t *chip)
{
      pmac_tumbler_t *mix = chip->mixer_data;
      if (! mix)
            return;

      if (mix->headphone_irq >= 0)
            free_irq(mix->headphone_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 __init snd_pmac_tumbler_init(pmac_t *chip)
{
      int i, err;
      pmac_tumbler_t *mix;
      u32 *paddr;
      struct device_node *tas_node;
      char *chipname;

#ifdef CONFIG_KMOD
      if (current->fs->root)
            request_module("i2c-keywest");
#endif /* CONFIG_KMOD */      

      mix = kmalloc(sizeof(*mix), GFP_KERNEL);
      if (! mix)
            return -ENOMEM;
      memset(mix, 0, sizeof(*mix));
      mix->headphone_irq = -1;

      chip->mixer_data = mix;
      chip->mixer_free = tumbler_cleanup;

      if ((err = tumbler_init(chip)) < 0)
            return err;

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

      paddr = (u32 *)get_property(tas_node, "i2c-address", NULL);
      if (paddr)
            mix->i2c.addr = (*paddr) >> 1;
      else
            mix->i2c.addr = TAS_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;
      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;


#ifdef CONFIG_PMAC_PBOOK
      chip->resume = tumbler_resume;
#endif

      INIT_WORK(&device_change, device_change_handler, (void *)chip);

#ifdef PMAC_SUPPORT_AUTOMUTE
      if (mix->headphone_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 */
#endif

      return 0;
}

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