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maya44.c

/*
 *   ALSA driver for ICEnsemble VT1724 (Envy24HT)
 *
 *   Lowlevel functions for ESI Maya44 cards
 *
 *    Copyright (c) 2009 Takashi Iwai <tiwai@suse.de>
 *    Based on the patches by Rainer Zimmermann <mail@lightshed.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
 *
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/tlv.h>

#include "ice1712.h"
#include "envy24ht.h"
#include "maya44.h"

/* WM8776 register indexes */
#define WM8776_REG_HEADPHONE_L            0x00
#define WM8776_REG_HEADPHONE_R            0x01
#define WM8776_REG_HEADPHONE_MASTER 0x02
#define WM8776_REG_DAC_ATTEN_L            0x03
#define WM8776_REG_DAC_ATTEN_R            0x04
#define WM8776_REG_DAC_ATTEN_MASTER 0x05
#define WM8776_REG_DAC_PHASE        0x06
#define WM8776_REG_DAC_CONTROL            0x07
#define WM8776_REG_DAC_MUTE         0x08
#define WM8776_REG_DAC_DEEMPH       0x09
#define WM8776_REG_DAC_IF_CONTROL   0x0a
#define WM8776_REG_ADC_IF_CONTROL   0x0b
#define WM8776_REG_MASTER_MODE_CONTROL    0x0c
#define WM8776_REG_POWERDOWN        0x0d
#define WM8776_REG_ADC_ATTEN_L            0x0e
#define WM8776_REG_ADC_ATTEN_R            0x0f
#define WM8776_REG_ADC_ALC1         0x10
#define WM8776_REG_ADC_ALC2         0x11
#define WM8776_REG_ADC_ALC3         0x12
#define WM8776_REG_ADC_NOISE_GATE   0x13
#define WM8776_REG_ADC_LIMITER            0x14
#define WM8776_REG_ADC_MUX          0x15
#define WM8776_REG_OUTPUT_MUX       0x16
#define WM8776_REG_RESET            0x17

#define WM8776_NUM_REGS             0x18

/* clock ratio identifiers for snd_wm8776_set_rate() */
#define WM8776_CLOCK_RATIO_128FS    0
#define WM8776_CLOCK_RATIO_192FS    1
#define WM8776_CLOCK_RATIO_256FS    2
#define WM8776_CLOCK_RATIO_384FS    3
#define WM8776_CLOCK_RATIO_512FS    4
#define WM8776_CLOCK_RATIO_768FS    5

enum { WM_VOL_HP, WM_VOL_DAC, WM_VOL_ADC, WM_NUM_VOLS };
enum { WM_SW_DAC, WM_SW_BYPASS, WM_NUM_SWITCHES };

00076 struct snd_wm8776 {
      unsigned char addr;
      unsigned short regs[WM8776_NUM_REGS];
      unsigned char volumes[WM_NUM_VOLS][2];
      unsigned int switch_bits;
};

00083 struct snd_maya44 {
      struct snd_ice1712 *ice;
      struct snd_wm8776 wm[2];
      struct mutex mutex;
};


/* write the given register and save the data to the cache */
static void wm8776_write(struct snd_ice1712 *ice, struct snd_wm8776 *wm,
                   unsigned char reg, unsigned short val)
{
      /*
       * WM8776 registers are up to 9 bits wide, bit 8 is placed in the LSB
       * of the address field
       */
      snd_vt1724_write_i2c(ice, wm->addr,
                       (reg << 1) | ((val >> 8) & 1),
                       val & 0xff);
      wm->regs[reg] = val;
}

/*
 * update the given register with and/or mask and save the data to the cache
 */
static int wm8776_write_bits(struct snd_ice1712 *ice, struct snd_wm8776 *wm,
                       unsigned char reg,
                       unsigned short mask, unsigned short val)
{
      val |= wm->regs[reg] & ~mask;
      if (val != wm->regs[reg]) {
            wm8776_write(ice, wm, reg, val);
            return 1;
      }
      return 0;
}


/*
 * WM8776 volume controls
 */

00124 struct maya_vol_info {
      unsigned int maxval;          /* volume range: 0..maxval */
      unsigned char regs[2];        /* left and right registers */
      unsigned short mask;          /* value mask */
      unsigned short offset;        /* zero-value offset */
      unsigned short mute;          /* mute bit */
      unsigned short update;        /* update bits */
      unsigned char mux_bits[2];    /* extra bits for ADC mute */
};

static struct maya_vol_info vol_info[WM_NUM_VOLS] = {
      [WM_VOL_HP] = {
            .maxval = 80,
            .regs = { WM8776_REG_HEADPHONE_L, WM8776_REG_HEADPHONE_R },
            .mask = 0x7f,
            .offset = 0x30,
            .mute = 0x00,
            .update = 0x180,  /* update and zero-cross enable */
      },
      [WM_VOL_DAC] = {
            .maxval = 255,
            .regs = { WM8776_REG_DAC_ATTEN_L, WM8776_REG_DAC_ATTEN_R },
            .mask = 0xff,
            .offset = 0x01,
            .mute = 0x00,
            .update = 0x100,  /* zero-cross enable */
      },
      [WM_VOL_ADC] = {
            .maxval = 91,
            .regs = { WM8776_REG_ADC_ATTEN_L, WM8776_REG_ADC_ATTEN_R },
            .mask = 0xff,
            .offset = 0xa5,
            .mute = 0xa5,
            .update = 0x100,  /* update */
            .mux_bits = { 0x80, 0x40 }, /* ADCMUX bits */
      },
};

/*
 * dB tables
 */
/* headphone output: mute, -73..+6db (1db step) */
static const DECLARE_TLV_DB_SCALE(db_scale_hp, -7400, 100, 1);
/* DAC output: mute, -127..0db (0.5db step) */
static const DECLARE_TLV_DB_SCALE(db_scale_dac, -12750, 50, 1);
/* ADC gain: mute, -21..+24db (0.5db step) */
static const DECLARE_TLV_DB_SCALE(db_scale_adc, -2100, 50, 1);

static int maya_vol_info(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_info *uinfo)
{
      unsigned int idx = kcontrol->private_value;
      struct maya_vol_info *vol = &vol_info[idx];

      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = vol->maxval;
      return 0;
}

static int maya_vol_get(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      struct snd_wm8776 *wm =
            &chip->wm[snd_ctl_get_ioff(kcontrol, &ucontrol->id)];
      unsigned int idx = kcontrol->private_value;

      mutex_lock(&chip->mutex);
      ucontrol->value.integer.value[0] = wm->volumes[idx][0];
      ucontrol->value.integer.value[1] = wm->volumes[idx][1];
      mutex_unlock(&chip->mutex);
      return 0;
}

static int maya_vol_put(struct snd_kcontrol *kcontrol,
                  struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      struct snd_wm8776 *wm =
            &chip->wm[snd_ctl_get_ioff(kcontrol, &ucontrol->id)];
      unsigned int idx = kcontrol->private_value;
      struct maya_vol_info *vol = &vol_info[idx];
      unsigned int val, data;
      int ch, changed = 0;

      mutex_lock(&chip->mutex);
      for (ch = 0; ch < 2; ch++) {
            val = ucontrol->value.integer.value[ch];
            if (val > vol->maxval)
                  val = vol->maxval;
            if (val == wm->volumes[idx][ch])
                  continue;
            if (!val)
                  data = vol->mute;
            else
                  data = (val - 1) + vol->offset;
            data |= vol->update;
            changed |= wm8776_write_bits(chip->ice, wm, vol->regs[ch],
                                   vol->mask | vol->update, data);
            if (vol->mux_bits[ch])
                  wm8776_write_bits(chip->ice, wm, WM8776_REG_ADC_MUX,
                                vol->mux_bits[ch],
                                val ? 0 : vol->mux_bits[ch]);
            wm->volumes[idx][ch] = val;
      }
      mutex_unlock(&chip->mutex);
      return changed;
}

/*
 * WM8776 switch controls
 */

#define COMPOSE_SW_VAL(idx, reg, mask)    ((idx) | ((reg) << 8) | ((mask) << 16))
#define GET_SW_VAL_IDX(val)   ((val) & 0xff)
#define GET_SW_VAL_REG(val)   (((val) >> 8) & 0xff)
#define GET_SW_VAL_MASK(val)  (((val) >> 16) & 0xff)

#define maya_sw_info    snd_ctl_boolean_mono_info

static int maya_sw_get(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      struct snd_wm8776 *wm =
            &chip->wm[snd_ctl_get_ioff(kcontrol, &ucontrol->id)];
      unsigned int idx = GET_SW_VAL_IDX(kcontrol->private_value);

      ucontrol->value.integer.value[0] = (wm->switch_bits >> idx) & 1;
      return 0;
}

static int maya_sw_put(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      struct snd_wm8776 *wm =
            &chip->wm[snd_ctl_get_ioff(kcontrol, &ucontrol->id)];
      unsigned int idx = GET_SW_VAL_IDX(kcontrol->private_value);
      unsigned int mask, val;
      int changed;

      mutex_lock(&chip->mutex);
      mask = 1 << idx;
      wm->switch_bits &= ~mask;
      val = ucontrol->value.integer.value[0];
      if (val)
            wm->switch_bits |= mask;
      mask = GET_SW_VAL_MASK(kcontrol->private_value);
      changed = wm8776_write_bits(chip->ice, wm,
                            GET_SW_VAL_REG(kcontrol->private_value),
                            mask, val ? mask : 0);
      mutex_unlock(&chip->mutex);
      return changed;
}

/*
 * GPIO pins (known ones for maya44)
 */
#define GPIO_PHANTOM_OFF      2
#define GPIO_MIC_RELAY        4
#define GPIO_SPDIF_IN_INV     5
#define GPIO_MUST_BE_0        7

/*
 * GPIO switch controls
 */

#define COMPOSE_GPIO_VAL(shift, inv)      ((shift) | ((inv) << 8))
#define GET_GPIO_VAL_SHIFT(val)           ((val) & 0xff)
#define GET_GPIO_VAL_INV(val)       (((val) >> 8) & 1)

static int maya_set_gpio_bits(struct snd_ice1712 *ice, unsigned int mask,
                        unsigned int bits)
{
      unsigned int data;
      data = snd_ice1712_gpio_read(ice);
      if ((data & mask) == bits)
            return 0;
      snd_ice1712_gpio_write(ice, (data & ~mask) | bits);
      return 1;
}

#define maya_gpio_sw_info     snd_ctl_boolean_mono_info

static int maya_gpio_sw_get(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      unsigned int shift = GET_GPIO_VAL_SHIFT(kcontrol->private_value);
      unsigned int val;

      val = (snd_ice1712_gpio_read(chip->ice) >> shift) & 1;
      if (GET_GPIO_VAL_INV(kcontrol->private_value))
            val = !val;
      ucontrol->value.integer.value[0] = val;
      return 0;
}

static int maya_gpio_sw_put(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      unsigned int shift = GET_GPIO_VAL_SHIFT(kcontrol->private_value);
      unsigned int val, mask;
      int changed;

      mutex_lock(&chip->mutex);
      mask = 1 << shift;
      val = ucontrol->value.integer.value[0];
      if (GET_GPIO_VAL_INV(kcontrol->private_value))
            val = !val;
      val = val ? mask : 0;
      changed = maya_set_gpio_bits(chip->ice, mask, val);
      mutex_unlock(&chip->mutex);
      return changed;
}

/*
 * capture source selection
 */

/* known working input slots (0-4) */
#define MAYA_LINE_IN    1     /* in-2 */
#define MAYA_MIC_IN     3     /* in-4 */

static void wm8776_select_input(struct snd_maya44 *chip, int idx, int line)
{
      wm8776_write_bits(chip->ice, &chip->wm[idx], WM8776_REG_ADC_MUX,
                    0x1f, 1 << line);
}

static int maya_rec_src_info(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_info *uinfo)
{
      static char *texts[] = { "Line", "Mic" };

      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = ARRAY_SIZE(texts);
      if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
            uinfo->value.enumerated.item =
                  uinfo->value.enumerated.items - 1;
      strcpy(uinfo->value.enumerated.name,
             texts[uinfo->value.enumerated.item]);
      return 0;
}

static int maya_rec_src_get(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      int sel;

      if (snd_ice1712_gpio_read(chip->ice) & (1 << GPIO_MIC_RELAY))
            sel = 1;
      else
            sel = 0;
      ucontrol->value.enumerated.item[0] = sel;
      return 0;
}

static int maya_rec_src_put(struct snd_kcontrol *kcontrol,
                      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      int sel = ucontrol->value.enumerated.item[0];
      int changed;

      mutex_lock(&chip->mutex);
      changed = maya_set_gpio_bits(chip->ice, 1 << GPIO_MIC_RELAY,
                             sel ? (1 << GPIO_MIC_RELAY) : 0);
      wm8776_select_input(chip, 0, sel ? MAYA_MIC_IN : MAYA_LINE_IN);
      mutex_unlock(&chip->mutex);
      return changed;
}

/*
 * Maya44 routing switch settings have different meanings than the standard
 * ice1724 switches as defined in snd_vt1724_pro_route_info (ice1724.c).
 */
static int maya_pb_route_info(struct snd_kcontrol *kcontrol,
                        struct snd_ctl_elem_info *uinfo)
{
      static char *texts[] = {
            "PCM Out", /* 0 */
            "Input 1", "Input 2", "Input 3", "Input 4"
      };

      uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
      uinfo->count = 1;
      uinfo->value.enumerated.items = ARRAY_SIZE(texts);
      if (uinfo->value.enumerated.item >= uinfo->value.enumerated.items)
            uinfo->value.enumerated.item =
                  uinfo->value.enumerated.items - 1;
      strcpy(uinfo->value.enumerated.name,
             texts[uinfo->value.enumerated.item]);
      return 0;
}

static int maya_pb_route_shift(int idx)
{
      static const unsigned char shift[10] =
            { 8, 20, 0, 3, 11, 23, 14, 26, 17, 29 };
      return shift[idx % 10];
}

static int maya_pb_route_get(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
      ucontrol->value.enumerated.item[0] =
            snd_ice1724_get_route_val(chip->ice, maya_pb_route_shift(idx));
      return 0;
}

static int maya_pb_route_put(struct snd_kcontrol *kcontrol,
                       struct snd_ctl_elem_value *ucontrol)
{
      struct snd_maya44 *chip = snd_kcontrol_chip(kcontrol);
      int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
      return snd_ice1724_put_route_val(chip->ice,
                               ucontrol->value.enumerated.item[0],
                               maya_pb_route_shift(idx));
}


/*
 * controls to be added
 */

static struct snd_kcontrol_new maya_controls[] __devinitdata = {
      {
            .name = "Crossmix Playback Volume",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
            .info = maya_vol_info,
            .get = maya_vol_get,
            .put = maya_vol_put,
            .tlv = { .p = db_scale_hp },
            .private_value = WM_VOL_HP,
            .count = 2,
      },
      {
            .name = "PCM Playback Volume",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
            .info = maya_vol_info,
            .get = maya_vol_get,
            .put = maya_vol_put,
            .tlv = { .p = db_scale_dac },
            .private_value = WM_VOL_DAC,
            .count = 2,
      },
      {
            .name = "Line Capture Volume",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
            .info = maya_vol_info,
            .get = maya_vol_get,
            .put = maya_vol_put,
            .tlv = { .p = db_scale_adc },
            .private_value = WM_VOL_ADC,
            .count = 2,
      },
      {
            .name = "PCM Playback Switch",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .info = maya_sw_info,
            .get = maya_sw_get,
            .put = maya_sw_put,
            .private_value = COMPOSE_SW_VAL(WM_SW_DAC,
                                    WM8776_REG_OUTPUT_MUX, 0x01),
            .count = 2,
      },
      {
            .name = "Bypass Playback Switch",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .info = maya_sw_info,
            .get = maya_sw_get,
            .put = maya_sw_put,
            .private_value = COMPOSE_SW_VAL(WM_SW_BYPASS,
                                    WM8776_REG_OUTPUT_MUX, 0x04),
            .count = 2,
      },
      {
            .name = "Capture Source",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .info = maya_rec_src_info,
            .get = maya_rec_src_get,
            .put = maya_rec_src_put,
      },
      {
            .name = "Mic Phantom Power Switch",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .info = maya_gpio_sw_info,
            .get = maya_gpio_sw_get,
            .put = maya_gpio_sw_put,
            .private_value = COMPOSE_GPIO_VAL(GPIO_PHANTOM_OFF, 1),
      },
      {
            .name = "SPDIF Capture Switch",
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .info = maya_gpio_sw_info,
            .get = maya_gpio_sw_get,
            .put = maya_gpio_sw_put,
            .private_value = COMPOSE_GPIO_VAL(GPIO_SPDIF_IN_INV, 1),
      },
      {
            .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
            .name = "H/W Playback Route",
            .info = maya_pb_route_info,
            .get = maya_pb_route_get,
            .put = maya_pb_route_put,
            .count = 4,  /* FIXME: do controls 5-9 have any meaning? */
      },
};

static int __devinit maya44_add_controls(struct snd_ice1712 *ice)
{
      int err, i;

      for (i = 0; i < ARRAY_SIZE(maya_controls); i++) {
            err = snd_ctl_add(ice->card, snd_ctl_new1(&maya_controls[i],
                                            ice->spec));
            if (err < 0)
                  return err;
      }
      return 0;
}


/*
 * initialize a wm8776 chip
 */
static void __devinit wm8776_init(struct snd_ice1712 *ice,
                          struct snd_wm8776 *wm, unsigned int addr)
{
      static const unsigned short inits_wm8776[] = {
            0x02, 0x100, /* R2: headphone L+R muted + update */
            0x05, 0x100, /* R5: DAC output L+R muted + update */
            0x06, 0x000, /* R6: DAC output phase normal */
            0x07, 0x091, /* R7: DAC enable zero cross detection,
                        normal output */
            0x08, 0x000, /* R8: DAC soft mute off */
            0x09, 0x000, /* R9: no deemph, DAC zero detect disabled */
            0x0a, 0x022, /* R10: DAC I2C mode, std polarities, 24bit */
            0x0b, 0x022, /* R11: ADC I2C mode, std polarities, 24bit,
                        highpass filter enabled */
            0x0c, 0x042, /* R12: ADC+DAC slave, ADC+DAC 44,1kHz */
            0x0d, 0x000, /* R13: all power up */
            0x0e, 0x100, /* R14: ADC left muted,
                        enable zero cross detection */
            0x0f, 0x100, /* R15: ADC right muted,
                        enable zero cross detection */
                       /* R16: ALC...*/
            0x11, 0x000, /* R17: disable ALC */
                       /* R18: ALC...*/
                       /* R19: noise gate...*/
            0x15, 0x000, /* R21: ADC input mux init, mute all inputs */
            0x16, 0x001, /* R22: output mux, select DAC */
            0xff, 0xff
      };

      const unsigned short *ptr;
      unsigned char reg;
      unsigned short data;

      wm->addr = addr;
      /* enable DAC output; mute bypass, aux & all inputs */
      wm->switch_bits = (1 << WM_SW_DAC);

      ptr = inits_wm8776;
      while (*ptr != 0xff) {
            reg = *ptr++;
            data = *ptr++;
            wm8776_write(ice, wm, reg, data);
      }
}


/*
 * change the rate on the WM8776 codecs.
 * this assumes that the VT17xx's rate is changed by the calling function.
 * NOTE: even though the WM8776's are running in slave mode and rate
 * selection is automatic, we need to call snd_wm8776_set_rate() here
 * to make sure some flags are set correctly.
 */
static void set_rate(struct snd_ice1712 *ice, unsigned int rate)
{
      struct snd_maya44 *chip = ice->spec;
      unsigned int ratio, adc_ratio, val;
      int i;

      switch (rate) {
      case 192000:
            ratio = WM8776_CLOCK_RATIO_128FS;
            break;
      case 176400:
            ratio = WM8776_CLOCK_RATIO_128FS;
            break;
      case 96000:
            ratio = WM8776_CLOCK_RATIO_256FS;
            break;
      case 88200:
            ratio = WM8776_CLOCK_RATIO_384FS;
            break;
      case 48000:
            ratio = WM8776_CLOCK_RATIO_512FS;
            break;
      case 44100:
            ratio = WM8776_CLOCK_RATIO_512FS;
            break;
      case 32000:
            ratio = WM8776_CLOCK_RATIO_768FS;
            break;
      case 0:
            /* no hint - S/PDIF input is master, simply return */
            return;
      default:
            snd_BUG();
            return;
      }

      /*
       * this currently sets the same rate for ADC and DAC, but limits
       * ADC rate to 256X (96kHz). For 256X mode (96kHz), this sets ADC
       * oversampling to 64x, as recommended by WM8776 datasheet.
       * Setting the rate is not really necessary in slave mode.
       */
      adc_ratio = ratio;
      if (adc_ratio < WM8776_CLOCK_RATIO_256FS)
            adc_ratio = WM8776_CLOCK_RATIO_256FS;

      val = adc_ratio;
      if (adc_ratio == WM8776_CLOCK_RATIO_256FS)
            val |= 8;
      val |= ratio << 4;

      mutex_lock(&chip->mutex);
      for (i = 0; i < 2; i++)
            wm8776_write_bits(ice, &chip->wm[i],
                          WM8776_REG_MASTER_MODE_CONTROL,
                          0x180, val);
      mutex_unlock(&chip->mutex);
}

/*
 * supported sample rates (to override the default one)
 */

static unsigned int rates[] = {
      32000, 44100, 48000, 64000, 88200, 96000, 176400, 192000
};

/* playback rates: 32..192 kHz */
static struct snd_pcm_hw_constraint_list dac_rates = {
      .count = ARRAY_SIZE(rates),
      .list = rates,
      .mask = 0
};


/*
 * chip addresses on I2C bus
 */
static unsigned char wm8776_addr[2] __devinitdata = {
      0x34, 0x36, /* codec 0 & 1 */
};

/*
 * initialize the chip
 */
static int __devinit maya44_init(struct snd_ice1712 *ice)
{
      int i;
      struct snd_maya44 *chip;

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (!chip)
            return -ENOMEM;
      mutex_init(&chip->mutex);
      chip->ice = ice;
      ice->spec = chip;

      /* initialise codecs */
      ice->num_total_dacs = 4;
      ice->num_total_adcs = 4;
      ice->akm_codecs = 0;

      for (i = 0; i < 2; i++) {
            wm8776_init(ice, &chip->wm[i], wm8776_addr[i]);
            wm8776_select_input(chip, i, MAYA_LINE_IN);
      }

      /* set card specific rates */
      ice->hw_rates = &dac_rates;

      /* register change rate notifier */
      ice->gpio.set_pro_rate = set_rate;

      /* RDMA1 (2nd input channel) is used for ADC by default */
      ice->force_rdma1 = 1;

      /* have an own routing control */
      ice->own_routing = 1;

      return 0;
}


/*
 * Maya44 boards don't provide the EEPROM data except for the vendor IDs.
 * hence the driver needs to sets up it properly.
 */

static unsigned char maya44_eeprom[] __devinitdata = {
      [ICE_EEP2_SYSCONF]     = 0x45,
            /* clock xin1=49.152MHz, mpu401, 2 stereo ADCs+DACs */
      [ICE_EEP2_ACLINK]      = 0x80,
            /* I2S */
      [ICE_EEP2_I2S]         = 0xf8,
            /* vol, 96k, 24bit, 192k */
      [ICE_EEP2_SPDIF]       = 0xc3,
            /* enable spdif out, spdif out supp, spdif-in, ext spdif out */
      [ICE_EEP2_GPIO_DIR]    = 0xff,
      [ICE_EEP2_GPIO_DIR1]   = 0xff,
      [ICE_EEP2_GPIO_DIR2]   = 0xff,
      [ICE_EEP2_GPIO_MASK]   = 0/*0x9f*/,
      [ICE_EEP2_GPIO_MASK1]  = 0/*0xff*/,
      [ICE_EEP2_GPIO_MASK2]  = 0/*0x7f*/,
      [ICE_EEP2_GPIO_STATE]  = (1 << GPIO_PHANTOM_OFF) |
                  (1 << GPIO_SPDIF_IN_INV),
      [ICE_EEP2_GPIO_STATE1] = 0x00,
      [ICE_EEP2_GPIO_STATE2] = 0x00,
};

/* entry point */
struct snd_ice1712_card_info snd_vt1724_maya44_cards[] __devinitdata = {
      {
            .subvendor = VT1724_SUBDEVICE_MAYA44,
            .name = "ESI Maya44",
            .model = "maya44",
            .chip_init = maya44_init,
            .build_controls = maya44_add_controls,
            .eeprom_size = sizeof(maya44_eeprom),
            .eeprom_data = maya44_eeprom,
      },
      { } /* terminator */
};

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