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tlv320dac33.c

/*
 * ALSA SoC Texas Instruments TLV320DAC33 codec driver
 *
 * Author:  Peter Ujfalusi <peter.ujfalusi@nokia.com>
 *
 * Copyright:   (C) 2009 Nokia Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/regulator/consumer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include <sound/tlv320dac33-plat.h>
#include "tlv320dac33.h"

#define DAC33_BUFFER_SIZE_BYTES           24576 /* bytes, 12288 16 bit words,
                                     * 6144 stereo */
#define DAC33_BUFFER_SIZE_SAMPLES   6144

#define NSAMPLE_MAX           5700

#define LATENCY_TIME_MS       20

static struct snd_soc_codec *tlv320dac33_codec;

enum dac33_state {
      DAC33_IDLE = 0,
      DAC33_PREFILL,
      DAC33_PLAYBACK,
      DAC33_FLUSH,
};

#define DAC33_NUM_SUPPLIES 3
static const char *dac33_supply_names[DAC33_NUM_SUPPLIES] = {
      "AVDD",
      "DVDD",
      "IOVDD",
};

struct tlv320dac33_priv {
      struct mutex mutex;
      struct workqueue_struct *dac33_wq;
      struct work_struct work;
      struct snd_soc_codec codec;
      struct regulator_bulk_data supplies[DAC33_NUM_SUPPLIES];
      int power_gpio;
      int chip_power;
      int irq;
      unsigned int refclk;

      unsigned int alarm_threshold; /* set to be half of LATENCY_TIME_MS */
      unsigned int nsample_min;     /* nsample should not be lower than
                               * this */
      unsigned int nsample_max;     /* nsample should not be higher than
                               * this */
      unsigned int nsample_switch;  /* Use FIFO or bypass FIFO switch */
      unsigned int nsample;         /* burst read amount from host */

      enum dac33_state state;
};

static const u8 dac33_reg[DAC33_CACHEREGNUM] = {
0x00, 0x00, 0x00, 0x00, /* 0x00 - 0x03 */
0x00, 0x00, 0x00, 0x00, /* 0x04 - 0x07 */
0x00, 0x00, 0x00, 0x00, /* 0x08 - 0x0b */
0x00, 0x00, 0x00, 0x00, /* 0x0c - 0x0f */
0x00, 0x00, 0x00, 0x00, /* 0x10 - 0x13 */
0x00, 0x00, 0x00, 0x00, /* 0x14 - 0x17 */
0x00, 0x00, 0x00, 0x00, /* 0x18 - 0x1b */
0x00, 0x00, 0x00, 0x00, /* 0x1c - 0x1f */
0x00, 0x00, 0x00, 0x00, /* 0x20 - 0x23 */
0x00, 0x00, 0x00, 0x00, /* 0x24 - 0x27 */
0x00, 0x00, 0x00, 0x00, /* 0x28 - 0x2b */
0x00, 0x00, 0x00, 0x80, /* 0x2c - 0x2f */
0x80, 0x00, 0x00, 0x00, /* 0x30 - 0x33 */
0x00, 0x00, 0x00, 0x00, /* 0x34 - 0x37 */
0x00, 0x00,             /* 0x38 - 0x39 */
/* Registers 0x3a - 0x3f are reserved  */
            0x00, 0x00, /* 0x3a - 0x3b */
0x00, 0x00, 0x00, 0x00, /* 0x3c - 0x3f */

0x00, 0x00, 0x00, 0x00, /* 0x40 - 0x43 */
0x00, 0x80,             /* 0x44 - 0x45 */
/* Registers 0x46 - 0x47 are reserved  */
            0x80, 0x80, /* 0x46 - 0x47 */

0x80, 0x00, 0x00,       /* 0x48 - 0x4a */
/* Registers 0x4b - 0x7c are reserved  */
                  0x00, /* 0x4b        */
0x00, 0x00, 0x00, 0x00, /* 0x4c - 0x4f */
0x00, 0x00, 0x00, 0x00, /* 0x50 - 0x53 */
0x00, 0x00, 0x00, 0x00, /* 0x54 - 0x57 */
0x00, 0x00, 0x00, 0x00, /* 0x58 - 0x5b */
0x00, 0x00, 0x00, 0x00, /* 0x5c - 0x5f */
0x00, 0x00, 0x00, 0x00, /* 0x60 - 0x63 */
0x00, 0x00, 0x00, 0x00, /* 0x64 - 0x67 */
0x00, 0x00, 0x00, 0x00, /* 0x68 - 0x6b */
0x00, 0x00, 0x00, 0x00, /* 0x6c - 0x6f */
0x00, 0x00, 0x00, 0x00, /* 0x70 - 0x73 */
0x00, 0x00, 0x00, 0x00, /* 0x74 - 0x77 */
0x00, 0x00, 0x00, 0x00, /* 0x78 - 0x7b */
0x00,                   /* 0x7c        */

      0xda, 0x33, 0x03, /* 0x7d - 0x7f */
};

/* Register read and write */
static inline unsigned int dac33_read_reg_cache(struct snd_soc_codec *codec,
                                    unsigned reg)
{
      u8 *cache = codec->reg_cache;
      if (reg >= DAC33_CACHEREGNUM)
            return 0;

      return cache[reg];
}

static inline void dac33_write_reg_cache(struct snd_soc_codec *codec,
                               u8 reg, u8 value)
{
      u8 *cache = codec->reg_cache;
      if (reg >= DAC33_CACHEREGNUM)
            return;

      cache[reg] = value;
}

static int dac33_read(struct snd_soc_codec *codec, unsigned int reg,
                  u8 *value)
{
      struct tlv320dac33_priv *dac33 = codec->private_data;
      int val;

      *value = reg & 0xff;

      /* If powered off, return the cached value */
      if (dac33->chip_power) {
            val = i2c_smbus_read_byte_data(codec->control_data, value[0]);
            if (val < 0) {
                  dev_err(codec->dev, "Read failed (%d)\n", val);
                  value[0] = dac33_read_reg_cache(codec, reg);
            } else {
                  value[0] = val;
                  dac33_write_reg_cache(codec, reg, val);
            }
      } else {
            value[0] = dac33_read_reg_cache(codec, reg);
      }

      return 0;
}

static int dac33_write(struct snd_soc_codec *codec, unsigned int reg,
                   unsigned int value)
{
      struct tlv320dac33_priv *dac33 = codec->private_data;
      u8 data[2];
      int ret = 0;

      /*
       * data is
       *   D15..D8 dac33 register offset
       *   D7...D0 register data
       */
      data[0] = reg & 0xff;
      data[1] = value & 0xff;

      dac33_write_reg_cache(codec, data[0], data[1]);
      if (dac33->chip_power) {
            ret = codec->hw_write(codec->control_data, data, 2);
            if (ret != 2)
                  dev_err(codec->dev, "Write failed (%d)\n", ret);
            else
                  ret = 0;
      }

      return ret;
}

static int dac33_write_locked(struct snd_soc_codec *codec, unsigned int reg,
                   unsigned int value)
{
      struct tlv320dac33_priv *dac33 = codec->private_data;
      int ret;

      mutex_lock(&dac33->mutex);
      ret = dac33_write(codec, reg, value);
      mutex_unlock(&dac33->mutex);

      return ret;
}

#define DAC33_I2C_ADDR_AUTOINC      0x80
static int dac33_write16(struct snd_soc_codec *codec, unsigned int reg,
                   unsigned int value)
{
      struct tlv320dac33_priv *dac33 = codec->private_data;
      u8 data[3];
      int ret = 0;

      /*
       * data is
       *   D23..D16 dac33 register offset
       *   D15..D8  register data MSB
       *   D7...D0  register data LSB
       */
      data[0] = reg & 0xff;
      data[1] = (value >> 8) & 0xff;
      data[2] = value & 0xff;

      dac33_write_reg_cache(codec, data[0], data[1]);
      dac33_write_reg_cache(codec, data[0] + 1, data[2]);

      if (dac33->chip_power) {
            /* We need to set autoincrement mode for 16 bit writes */
            data[0] |= DAC33_I2C_ADDR_AUTOINC;
            ret = codec->hw_write(codec->control_data, data, 3);
            if (ret != 3)
                  dev_err(codec->dev, "Write failed (%d)\n", ret);
            else
                  ret = 0;
      }

      return ret;
}

static void dac33_restore_regs(struct snd_soc_codec *codec)
{
      struct tlv320dac33_priv *dac33 = codec->private_data;
      u8 *cache = codec->reg_cache;
      u8 data[2];
      int i, ret;

      if (!dac33->chip_power)
            return;

      for (i = DAC33_PWR_CTRL; i <= DAC33_INTP_CTRL_B; i++) {
            data[0] = i;
            data[1] = cache[i];
            /* Skip the read only registers */
            if ((i >= DAC33_INT_OSC_STATUS &&
                        i <= DAC33_INT_OSC_FREQ_RAT_READ_B) ||
                (i >= DAC33_FIFO_WPTR_MSB && i <= DAC33_FIFO_IRQ_FLAG) ||
                i == DAC33_DAC_STATUS_FLAGS ||
                i == DAC33_SRC_EST_REF_CLK_RATIO_A ||
                i == DAC33_SRC_EST_REF_CLK_RATIO_B)
                  continue;
            ret = codec->hw_write(codec->control_data, data, 2);
            if (ret != 2)
                  dev_err(codec->dev, "Write failed (%d)\n", ret);
      }
      for (i = DAC33_LDAC_PWR_CTRL; i <= DAC33_LINEL_TO_LLO_VOL; i++) {
            data[0] = i;
            data[1] = cache[i];
            ret = codec->hw_write(codec->control_data, data, 2);
            if (ret != 2)
                  dev_err(codec->dev, "Write failed (%d)\n", ret);
      }
      for (i = DAC33_LINER_TO_RLO_VOL; i <= DAC33_OSC_TRIM; i++) {
            data[0] = i;
            data[1] = cache[i];
            ret = codec->hw_write(codec->control_data, data, 2);
            if (ret != 2)
                  dev_err(codec->dev, "Write failed (%d)\n", ret);
      }
}

static inline void dac33_soft_power(struct snd_soc_codec *codec, int power)
{
      u8 reg;

      reg = dac33_read_reg_cache(codec, DAC33_PWR_CTRL);
      if (power)
            reg |= DAC33_PDNALLB;
      else
            reg &= ~DAC33_PDNALLB;
      dac33_write(codec, DAC33_PWR_CTRL, reg);
}

static int dac33_hard_power(struct snd_soc_codec *codec, int power)
{
      struct tlv320dac33_priv *dac33 = codec->private_data;
      int ret;

      mutex_lock(&dac33->mutex);
      if (power) {
            ret = regulator_bulk_enable(ARRAY_SIZE(dac33->supplies),
                                dac33->supplies);
            if (ret != 0) {
                  dev_err(codec->dev,
                        "Failed to enable supplies: %d\n", ret);
                        goto exit;
            }

            if (dac33->power_gpio >= 0)
                  gpio_set_value(dac33->power_gpio, 1);

            dac33->chip_power = 1;

            /* Restore registers */
            dac33_restore_regs(codec);

            dac33_soft_power(codec, 1);
      } else {
            dac33_soft_power(codec, 0);
            if (dac33->power_gpio >= 0)
                  gpio_set_value(dac33->power_gpio, 0);

            ret = regulator_bulk_disable(ARRAY_SIZE(dac33->supplies),
                                   dac33->supplies);
            if (ret != 0) {
                  dev_err(codec->dev,
                        "Failed to disable supplies: %d\n", ret);
                  goto exit;
            }

            dac33->chip_power = 0;
      }

exit:
      mutex_unlock(&dac33->mutex);
      return ret;
}

static int dac33_get_nsample(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
      struct tlv320dac33_priv *dac33 = codec->private_data;

      ucontrol->value.integer.value[0] = dac33->nsample;

      return 0;
}

static int dac33_set_nsample(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
      struct tlv320dac33_priv *dac33 = codec->private_data;
      int ret = 0;

      if (dac33->nsample == ucontrol->value.integer.value[0])
            return 0;

      if (ucontrol->value.integer.value[0] < dac33->nsample_min ||
          ucontrol->value.integer.value[0] > dac33->nsample_max)
            ret = -EINVAL;
      else
            dac33->nsample = ucontrol->value.integer.value[0];

      return ret;
}

static int dac33_get_nsample_switch(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
      struct tlv320dac33_priv *dac33 = codec->private_data;

      ucontrol->value.integer.value[0] = dac33->nsample_switch;

      return 0;
}

static int dac33_set_nsample_switch(struct snd_kcontrol *kcontrol,
                   struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
      struct tlv320dac33_priv *dac33 = codec->private_data;
      int ret = 0;

      if (dac33->nsample_switch == ucontrol->value.integer.value[0])
            return 0;
      /* Do not allow changes while stream is running*/
      if (codec->active)
            return -EPERM;

      if (ucontrol->value.integer.value[0] < 0 ||
          ucontrol->value.integer.value[0] > 1)
            ret = -EINVAL;
      else
            dac33->nsample_switch = ucontrol->value.integer.value[0];

      return ret;
}

/*
 * DACL/R digital volume control:
 * from 0 dB to -63.5 in 0.5 dB steps
 * Need to be inverted later on:
 * 0x00 == 0 dB
 * 0x7f == -63.5 dB
 */
static DECLARE_TLV_DB_SCALE(dac_digivol_tlv, -6350, 50, 0);

static const struct snd_kcontrol_new dac33_snd_controls[] = {
      SOC_DOUBLE_R_TLV("DAC Digital Playback Volume",
            DAC33_LDAC_DIG_VOL_CTRL, DAC33_RDAC_DIG_VOL_CTRL,
            0, 0x7f, 1, dac_digivol_tlv),
      SOC_DOUBLE_R("DAC Digital Playback Switch",
             DAC33_LDAC_DIG_VOL_CTRL, DAC33_RDAC_DIG_VOL_CTRL, 7, 1, 1),
      SOC_DOUBLE_R("Line to Line Out Volume",
             DAC33_LINEL_TO_LLO_VOL, DAC33_LINER_TO_RLO_VOL, 0, 127, 1),
};

static const struct snd_kcontrol_new dac33_nsample_snd_controls[] = {
      SOC_SINGLE_EXT("nSample", 0, 0, 5900, 0,
             dac33_get_nsample, dac33_set_nsample),
      SOC_SINGLE_EXT("nSample Switch", 0, 0, 1, 0,
             dac33_get_nsample_switch, dac33_set_nsample_switch),
};

/* Analog bypass */
static const struct snd_kcontrol_new dac33_dapm_abypassl_control =
      SOC_DAPM_SINGLE("Switch", DAC33_LINEL_TO_LLO_VOL, 7, 1, 1);

static const struct snd_kcontrol_new dac33_dapm_abypassr_control =
      SOC_DAPM_SINGLE("Switch", DAC33_LINER_TO_RLO_VOL, 7, 1, 1);

static const struct snd_soc_dapm_widget dac33_dapm_widgets[] = {
      SND_SOC_DAPM_OUTPUT("LEFT_LO"),
      SND_SOC_DAPM_OUTPUT("RIGHT_LO"),

      SND_SOC_DAPM_INPUT("LINEL"),
      SND_SOC_DAPM_INPUT("LINER"),

      SND_SOC_DAPM_DAC("DACL", "Left Playback", DAC33_LDAC_PWR_CTRL, 2, 0),
      SND_SOC_DAPM_DAC("DACR", "Right Playback", DAC33_RDAC_PWR_CTRL, 2, 0),

      /* Analog bypass */
      SND_SOC_DAPM_SWITCH("Analog Left Bypass", SND_SOC_NOPM, 0, 0,
                        &dac33_dapm_abypassl_control),
      SND_SOC_DAPM_SWITCH("Analog Right Bypass", SND_SOC_NOPM, 0, 0,
                        &dac33_dapm_abypassr_control),

      SND_SOC_DAPM_REG(snd_soc_dapm_mixer, "Output Left Amp Power",
                   DAC33_OUT_AMP_PWR_CTRL, 6, 3, 3, 0),
      SND_SOC_DAPM_REG(snd_soc_dapm_mixer, "Output Right Amp Power",
                   DAC33_OUT_AMP_PWR_CTRL, 4, 3, 3, 0),
};

static const struct snd_soc_dapm_route audio_map[] = {
      /* Analog bypass */
      {"Analog Left Bypass", "Switch", "LINEL"},
      {"Analog Right Bypass", "Switch", "LINER"},

      {"Output Left Amp Power", NULL, "DACL"},
      {"Output Right Amp Power", NULL, "DACR"},

      {"Output Left Amp Power", NULL, "Analog Left Bypass"},
      {"Output Right Amp Power", NULL, "Analog Right Bypass"},

      /* output */
      {"LEFT_LO", NULL, "Output Left Amp Power"},
      {"RIGHT_LO", NULL, "Output Right Amp Power"},
};

static int dac33_add_widgets(struct snd_soc_codec *codec)
{
      snd_soc_dapm_new_controls(codec, dac33_dapm_widgets,
                          ARRAY_SIZE(dac33_dapm_widgets));

      /* set up audio path interconnects */
      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

      return 0;
}

static int dac33_set_bias_level(struct snd_soc_codec *codec,
                        enum snd_soc_bias_level level)
{
      int ret;

      switch (level) {
      case SND_SOC_BIAS_ON:
            dac33_soft_power(codec, 1);
            break;
      case SND_SOC_BIAS_PREPARE:
            break;
      case SND_SOC_BIAS_STANDBY:
            if (codec->bias_level == SND_SOC_BIAS_OFF) {
                  ret = dac33_hard_power(codec, 1);
                  if (ret != 0)
                        return ret;
            }

            dac33_soft_power(codec, 0);
            break;
      case SND_SOC_BIAS_OFF:
            ret = dac33_hard_power(codec, 0);
            if (ret != 0)
                  return ret;

            break;
      }
      codec->bias_level = level;

      return 0;
}

static void dac33_work(struct work_struct *work)
{
      struct snd_soc_codec *codec;
      struct tlv320dac33_priv *dac33;
      u8 reg;

      dac33 = container_of(work, struct tlv320dac33_priv, work);
      codec = &dac33->codec;

      mutex_lock(&dac33->mutex);
      switch (dac33->state) {
      case DAC33_PREFILL:
            dac33->state = DAC33_PLAYBACK;
            dac33_write16(codec, DAC33_NSAMPLE_MSB,
                        DAC33_THRREG(dac33->nsample));
            dac33_write16(codec, DAC33_PREFILL_MSB,
                        DAC33_THRREG(dac33->alarm_threshold));
            break;
      case DAC33_PLAYBACK:
            dac33_write16(codec, DAC33_NSAMPLE_MSB,
                        DAC33_THRREG(dac33->nsample));
            break;
      case DAC33_IDLE:
            break;
      case DAC33_FLUSH:
            dac33->state = DAC33_IDLE;
            /* Mask all interrupts from dac33 */
            dac33_write(codec, DAC33_FIFO_IRQ_MASK, 0);

            /* flush fifo */
            reg = dac33_read_reg_cache(codec, DAC33_FIFO_CTRL_A);
            reg |= DAC33_FIFOFLUSH;
            dac33_write(codec, DAC33_FIFO_CTRL_A, reg);
            break;
      }
      mutex_unlock(&dac33->mutex);
}

static irqreturn_t dac33_interrupt_handler(int irq, void *dev)
{
      struct snd_soc_codec *codec = dev;
      struct tlv320dac33_priv *dac33 = codec->private_data;

      queue_work(dac33->dac33_wq, &dac33->work);

      return IRQ_HANDLED;
}

static void dac33_shutdown(struct snd_pcm_substream *substream,
                       struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct tlv320dac33_priv *dac33 = codec->private_data;
      unsigned int pwr_ctrl;

      /* Stop pending workqueue */
      if (dac33->nsample_switch)
            cancel_work_sync(&dac33->work);

      mutex_lock(&dac33->mutex);
      pwr_ctrl = dac33_read_reg_cache(codec, DAC33_PWR_CTRL);
      pwr_ctrl &= ~(DAC33_OSCPDNB | DAC33_DACRPDNB | DAC33_DACLPDNB);
      dac33_write(codec, DAC33_PWR_CTRL, pwr_ctrl);
      mutex_unlock(&dac33->mutex);
}

static void dac33_oscwait(struct snd_soc_codec *codec)
{
      int timeout = 20;
      u8 reg;

      do {
            msleep(1);
            dac33_read(codec, DAC33_INT_OSC_STATUS, &reg);
      } while (((reg & 0x03) != DAC33_OSCSTATUS_NORMAL) && timeout--);
      if ((reg & 0x03) != DAC33_OSCSTATUS_NORMAL)
            dev_err(codec->dev,
                  "internal oscillator calibration failed\n");
}

static int dac33_hw_params(struct snd_pcm_substream *substream,
                     struct snd_pcm_hw_params *params,
                     struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;

      /* Check parameters for validity */
      switch (params_rate(params)) {
      case 44100:
      case 48000:
            break;
      default:
            dev_err(codec->dev, "unsupported rate %d\n",
                  params_rate(params));
            return -EINVAL;
      }

      switch (params_format(params)) {
      case SNDRV_PCM_FORMAT_S16_LE:
            break;
      default:
            dev_err(codec->dev, "unsupported format %d\n",
                  params_format(params));
            return -EINVAL;
      }

      return 0;
}

#define CALC_OSCSET(rate, refclk) ( \
      ((((rate * 10000) / refclk) * 4096) + 5000) / 10000)
#define CALC_RATIOSET(rate, refclk) ( \
      ((((refclk  * 100000) / rate) * 16384) + 50000) / 100000)

/*
 * tlv320dac33 is strict on the sequence of the register writes, if the register
 * writes happens in different order, than dac33 might end up in unknown state.
 * Use the known, working sequence of register writes to initialize the dac33.
 */
static int dac33_prepare_chip(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct tlv320dac33_priv *dac33 = codec->private_data;
      unsigned int oscset, ratioset, pwr_ctrl, reg_tmp;
      u8 aictrl_a, fifoctrl_a;

      switch (substream->runtime->rate) {
      case 44100:
      case 48000:
            oscset = CALC_OSCSET(substream->runtime->rate, dac33->refclk);
            ratioset = CALC_RATIOSET(substream->runtime->rate,
                               dac33->refclk);
            break;
      default:
            dev_err(codec->dev, "unsupported rate %d\n",
                  substream->runtime->rate);
            return -EINVAL;
      }


      aictrl_a = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A);
      aictrl_a &= ~(DAC33_NCYCL_MASK | DAC33_WLEN_MASK);
      fifoctrl_a = dac33_read_reg_cache(codec, DAC33_FIFO_CTRL_A);
      fifoctrl_a &= ~DAC33_WIDTH;
      switch (substream->runtime->format) {
      case SNDRV_PCM_FORMAT_S16_LE:
            aictrl_a |= (DAC33_NCYCL_16 | DAC33_WLEN_16);
            fifoctrl_a |= DAC33_WIDTH;
            break;
      default:
            dev_err(codec->dev, "unsupported format %d\n",
                  substream->runtime->format);
            return -EINVAL;
      }

      mutex_lock(&dac33->mutex);
      dac33_soft_power(codec, 1);

      reg_tmp = dac33_read_reg_cache(codec, DAC33_INT_OSC_CTRL);
      dac33_write(codec, DAC33_INT_OSC_CTRL, reg_tmp);

      /* Write registers 0x08 and 0x09 (MSB, LSB) */
      dac33_write16(codec, DAC33_INT_OSC_FREQ_RAT_A, oscset);

      /* calib time: 128 is a nice number ;) */
      dac33_write(codec, DAC33_CALIB_TIME, 128);

      /* adjustment treshold & step */
      dac33_write(codec, DAC33_INT_OSC_CTRL_B, DAC33_ADJTHRSHLD(2) |
                                     DAC33_ADJSTEP(1));

      /* div=4 / gain=1 / div */
      dac33_write(codec, DAC33_INT_OSC_CTRL_C, DAC33_REFDIV(4));

      pwr_ctrl = dac33_read_reg_cache(codec, DAC33_PWR_CTRL);
      pwr_ctrl |= DAC33_OSCPDNB | DAC33_DACRPDNB | DAC33_DACLPDNB;
      dac33_write(codec, DAC33_PWR_CTRL, pwr_ctrl);

      dac33_oscwait(codec);

      if (dac33->nsample_switch) {
            /* 50-51 : ASRC Control registers */
            dac33_write(codec, DAC33_ASRC_CTRL_A, (1 << 4)); /* div=2 */
            dac33_write(codec, DAC33_ASRC_CTRL_B, 1); /* ??? */

            /* Write registers 0x34 and 0x35 (MSB, LSB) */
            dac33_write16(codec, DAC33_SRC_REF_CLK_RATIO_A, ratioset);

            /* Set interrupts to high active */
            dac33_write(codec, DAC33_INTP_CTRL_A, DAC33_INTPM_AHIGH);

            dac33_write(codec, DAC33_FIFO_IRQ_MODE_B,
                      DAC33_ATM(DAC33_FIFO_IRQ_MODE_LEVEL));
            dac33_write(codec, DAC33_FIFO_IRQ_MASK, DAC33_MAT);
      } else {
            /* 50-51 : ASRC Control registers */
            dac33_write(codec, DAC33_ASRC_CTRL_A, DAC33_SRCBYP);
            dac33_write(codec, DAC33_ASRC_CTRL_B, 0); /* ??? */
      }

      if (dac33->nsample_switch)
            fifoctrl_a &= ~DAC33_FBYPAS;
      else
            fifoctrl_a |= DAC33_FBYPAS;
      dac33_write(codec, DAC33_FIFO_CTRL_A, fifoctrl_a);

      dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_A, aictrl_a);
      reg_tmp = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_B);
      if (dac33->nsample_switch)
            reg_tmp &= ~DAC33_BCLKON;
      else
            reg_tmp |= DAC33_BCLKON;
      dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_B, reg_tmp);

      if (dac33->nsample_switch) {
            /* 20: BCLK divide ratio */
            dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_C, 3);

            dac33_write16(codec, DAC33_ATHR_MSB,
                        DAC33_THRREG(dac33->alarm_threshold));
      } else {
            dac33_write(codec, DAC33_SER_AUDIOIF_CTRL_C, 32);
      }

      mutex_unlock(&dac33->mutex);

      return 0;
}

static void dac33_calculate_times(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct tlv320dac33_priv *dac33 = codec->private_data;
      unsigned int nsample_limit;

      /* Number of samples (16bit, stereo) in one period */
      dac33->nsample_min = snd_pcm_lib_period_bytes(substream) / 4;

      /* Number of samples (16bit, stereo) in ALSA buffer */
      dac33->nsample_max = snd_pcm_lib_buffer_bytes(substream) / 4;
      /* Subtract one period from the total */
      dac33->nsample_max -= dac33->nsample_min;

      /* Number of samples for LATENCY_TIME_MS / 2 */
      dac33->alarm_threshold = substream->runtime->rate /
                         (1000 / (LATENCY_TIME_MS / 2));

      /* Find and fix up the lowest nsmaple limit */
      nsample_limit = substream->runtime->rate / (1000 / LATENCY_TIME_MS);

      if (dac33->nsample_min < nsample_limit)
            dac33->nsample_min = nsample_limit;

      if (dac33->nsample < dac33->nsample_min)
            dac33->nsample = dac33->nsample_min;

      /*
       * Find and fix up the highest nsmaple limit
       * In order to not overflow the DAC33 buffer substract the
       * alarm_threshold value from the size of the DAC33 buffer
       */
      nsample_limit = DAC33_BUFFER_SIZE_SAMPLES - dac33->alarm_threshold;

      if (dac33->nsample_max > nsample_limit)
            dac33->nsample_max = nsample_limit;

      if (dac33->nsample > dac33->nsample_max)
            dac33->nsample = dac33->nsample_max;
}

static int dac33_pcm_prepare(struct snd_pcm_substream *substream,
                       struct snd_soc_dai *dai)
{
      dac33_calculate_times(substream);
      dac33_prepare_chip(substream);

      return 0;
}

static int dac33_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
                       struct snd_soc_dai *dai)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_device *socdev = rtd->socdev;
      struct snd_soc_codec *codec = socdev->card->codec;
      struct tlv320dac33_priv *dac33 = codec->private_data;
      int ret = 0;

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
      case SNDRV_PCM_TRIGGER_RESUME:
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            if (dac33->nsample_switch) {
                  dac33->state = DAC33_PREFILL;
                  queue_work(dac33->dac33_wq, &dac33->work);
            }
            break;
      case SNDRV_PCM_TRIGGER_STOP:
      case SNDRV_PCM_TRIGGER_SUSPEND:
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            if (dac33->nsample_switch) {
                  dac33->state = DAC33_FLUSH;
                  queue_work(dac33->dac33_wq, &dac33->work);
            }
            break;
      default:
            ret = -EINVAL;
      }

      return ret;
}

static int dac33_set_dai_sysclk(struct snd_soc_dai *codec_dai,
            int clk_id, unsigned int freq, int dir)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      struct tlv320dac33_priv *dac33 = codec->private_data;
      u8 ioc_reg, asrcb_reg;

      ioc_reg = dac33_read_reg_cache(codec, DAC33_INT_OSC_CTRL);
      asrcb_reg = dac33_read_reg_cache(codec, DAC33_ASRC_CTRL_B);
      switch (clk_id) {
      case TLV320DAC33_MCLK:
            ioc_reg |= DAC33_REFSEL;
            asrcb_reg |= DAC33_SRCREFSEL;
            break;
      case TLV320DAC33_SLEEPCLK:
            ioc_reg &= ~DAC33_REFSEL;
            asrcb_reg &= ~DAC33_SRCREFSEL;
            break;
      default:
            dev_err(codec->dev, "Invalid clock ID (%d)\n", clk_id);
            break;
      }
      dac33->refclk = freq;

      dac33_write_reg_cache(codec, DAC33_INT_OSC_CTRL, ioc_reg);
      dac33_write_reg_cache(codec, DAC33_ASRC_CTRL_B, asrcb_reg);

      return 0;
}

static int dac33_set_dai_fmt(struct snd_soc_dai *codec_dai,
                       unsigned int fmt)
{
      struct snd_soc_codec *codec = codec_dai->codec;
      u8 aictrl_a, aictrl_b;

      aictrl_a = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A);
      aictrl_b = dac33_read_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_B);
      /* set master/slave audio interface */
      switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
      case SND_SOC_DAIFMT_CBM_CFM:
            /* Codec Master */
            aictrl_a |= (DAC33_MSBCLK | DAC33_MSWCLK);
            break;
      case SND_SOC_DAIFMT_CBS_CFS:
            /* Codec Slave */
            aictrl_a &= ~(DAC33_MSBCLK | DAC33_MSWCLK);
            break;
      default:
            return -EINVAL;
      }

      aictrl_a &= ~DAC33_AFMT_MASK;
      switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
      case SND_SOC_DAIFMT_I2S:
            aictrl_a |= DAC33_AFMT_I2S;
            break;
      case SND_SOC_DAIFMT_DSP_A:
            aictrl_a |= DAC33_AFMT_DSP;
            aictrl_b &= ~DAC33_DATA_DELAY_MASK;
            aictrl_b |= DAC33_DATA_DELAY(1); /* 1 bit delay */
            break;
      case SND_SOC_DAIFMT_DSP_B:
            aictrl_a |= DAC33_AFMT_DSP;
            aictrl_b &= ~DAC33_DATA_DELAY_MASK; /* No delay */
            break;
      case SND_SOC_DAIFMT_RIGHT_J:
            aictrl_a |= DAC33_AFMT_RIGHT_J;
            break;
      case SND_SOC_DAIFMT_LEFT_J:
            aictrl_a |= DAC33_AFMT_LEFT_J;
            break;
      default:
            dev_err(codec->dev, "Unsupported format (%u)\n",
                  fmt & SND_SOC_DAIFMT_FORMAT_MASK);
            return -EINVAL;
      }

      dac33_write_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_A, aictrl_a);
      dac33_write_reg_cache(codec, DAC33_SER_AUDIOIF_CTRL_B, aictrl_b);

      return 0;
}

static void dac33_init_chip(struct snd_soc_codec *codec)
{
      /* 44-46: DAC Control Registers */
      /* A : DAC sample rate Fsref/1.5 */
      dac33_write(codec, DAC33_DAC_CTRL_A, DAC33_DACRATE(1));
      /* B : DAC src=normal, not muted */
      dac33_write(codec, DAC33_DAC_CTRL_B, DAC33_DACSRCR_RIGHT |
                                   DAC33_DACSRCL_LEFT);
      /* C : (defaults) */
      dac33_write(codec, DAC33_DAC_CTRL_C, 0x00);

      /* 64-65 : L&R DAC power control
       Line In -> OUT 1V/V Gain, DAC -> OUT 4V/V Gain*/
      dac33_write(codec, DAC33_LDAC_PWR_CTRL, DAC33_LROUT_GAIN(2));
      dac33_write(codec, DAC33_RDAC_PWR_CTRL, DAC33_LROUT_GAIN(2));

      /* 73 : volume soft stepping control,
       clock source = internal osc (?) */
      dac33_write(codec, DAC33_ANA_VOL_SOFT_STEP_CTRL, DAC33_VOLCLKEN);

      /* 66 : LOP/LOM Modes */
      dac33_write(codec, DAC33_OUT_AMP_CM_CTRL, 0xff);

      /* 68 : LOM inverted from LOP */
      dac33_write(codec, DAC33_OUT_AMP_CTRL, (3<<2));

      dac33_write(codec, DAC33_PWR_CTRL, DAC33_PDNALLB);
}

static int dac33_soc_probe(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec;
      struct tlv320dac33_priv *dac33;
      int ret = 0;

      BUG_ON(!tlv320dac33_codec);

      codec = tlv320dac33_codec;
      socdev->card->codec = codec;
      dac33 = codec->private_data;

      /* Power up the codec */
      dac33_hard_power(codec, 1);
      /* Set default configuration */
      dac33_init_chip(codec);

      /* register pcms */
      ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
      if (ret < 0) {
            dev_err(codec->dev, "failed to create pcms\n");
            goto pcm_err;
      }

      snd_soc_add_controls(codec, dac33_snd_controls,
                       ARRAY_SIZE(dac33_snd_controls));
      /* Only add the nSample controls, if we have valid IRQ number */
      if (dac33->irq >= 0)
            snd_soc_add_controls(codec, dac33_nsample_snd_controls,
                             ARRAY_SIZE(dac33_nsample_snd_controls));

      dac33_add_widgets(codec);

      /* power on device */
      dac33_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

      /* Bias level configuration has enabled regulator an extra time */
      regulator_bulk_disable(ARRAY_SIZE(dac33->supplies), dac33->supplies);

      return 0;

pcm_err:
      dac33_hard_power(codec, 0);
      return ret;
}

static int dac33_soc_remove(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      dac33_set_bias_level(codec, SND_SOC_BIAS_OFF);

      snd_soc_free_pcms(socdev);
      snd_soc_dapm_free(socdev);

      return 0;
}

static int dac33_soc_suspend(struct platform_device *pdev, pm_message_t state)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      dac33_set_bias_level(codec, SND_SOC_BIAS_OFF);

      return 0;
}

static int dac33_soc_resume(struct platform_device *pdev)
{
      struct snd_soc_device *socdev = platform_get_drvdata(pdev);
      struct snd_soc_codec *codec = socdev->card->codec;

      dac33_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
      dac33_set_bias_level(codec, codec->suspend_bias_level);

      return 0;
}

struct snd_soc_codec_device soc_codec_dev_tlv320dac33 = {
      .probe = dac33_soc_probe,
      .remove = dac33_soc_remove,
      .suspend = dac33_soc_suspend,
      .resume = dac33_soc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_tlv320dac33);

#define DAC33_RATES     (SNDRV_PCM_RATE_44100 | \
                   SNDRV_PCM_RATE_48000)
#define DAC33_FORMATS   SNDRV_PCM_FMTBIT_S16_LE

static struct snd_soc_dai_ops dac33_dai_ops = {
      .shutdown   = dac33_shutdown,
      .hw_params  = dac33_hw_params,
      .prepare    = dac33_pcm_prepare,
      .trigger    = dac33_pcm_trigger,
      .set_sysclk = dac33_set_dai_sysclk,
      .set_fmt    = dac33_set_dai_fmt,
};

struct snd_soc_dai dac33_dai = {
      .name = "tlv320dac33",
      .playback = {
            .stream_name = "Playback",
            .channels_min = 2,
            .channels_max = 2,
            .rates = DAC33_RATES,
            .formats = DAC33_FORMATS,},
      .ops = &dac33_dai_ops,
};
EXPORT_SYMBOL_GPL(dac33_dai);

static int dac33_i2c_probe(struct i2c_client *client,
                     const struct i2c_device_id *id)
{
      struct tlv320dac33_platform_data *pdata;
      struct tlv320dac33_priv *dac33;
      struct snd_soc_codec *codec;
      int ret, i;

      if (client->dev.platform_data == NULL) {
            dev_err(&client->dev, "Platform data not set\n");
            return -ENODEV;
      }
      pdata = client->dev.platform_data;

      dac33 = kzalloc(sizeof(struct tlv320dac33_priv), GFP_KERNEL);
      if (dac33 == NULL)
            return -ENOMEM;

      codec = &dac33->codec;
      codec->private_data = dac33;
      codec->control_data = client;

      mutex_init(&codec->mutex);
      mutex_init(&dac33->mutex);
      INIT_LIST_HEAD(&codec->dapm_widgets);
      INIT_LIST_HEAD(&codec->dapm_paths);

      codec->name = "tlv320dac33";
      codec->owner = THIS_MODULE;
      codec->read = dac33_read_reg_cache;
      codec->write = dac33_write_locked;
      codec->hw_write = (hw_write_t) i2c_master_send;
      codec->bias_level = SND_SOC_BIAS_OFF;
      codec->set_bias_level = dac33_set_bias_level;
      codec->dai = &dac33_dai;
      codec->num_dai = 1;
      codec->reg_cache_size = ARRAY_SIZE(dac33_reg);
      codec->reg_cache = kmemdup(dac33_reg, ARRAY_SIZE(dac33_reg),
                           GFP_KERNEL);
      if (codec->reg_cache == NULL) {
            ret = -ENOMEM;
            goto error_reg;
      }

      i2c_set_clientdata(client, dac33);

      dac33->power_gpio = pdata->power_gpio;
      dac33->irq = client->irq;
      dac33->nsample = NSAMPLE_MAX;
      /* Disable FIFO use by default */
      dac33->nsample_switch = 0;

      tlv320dac33_codec = codec;

      codec->dev = &client->dev;
      dac33_dai.dev = codec->dev;

      /* Check if the reset GPIO number is valid and request it */
      if (dac33->power_gpio >= 0) {
            ret = gpio_request(dac33->power_gpio, "tlv320dac33 reset");
            if (ret < 0) {
                  dev_err(codec->dev,
                        "Failed to request reset GPIO (%d)\n",
                        dac33->power_gpio);
                  snd_soc_unregister_dai(&dac33_dai);
                  snd_soc_unregister_codec(codec);
                  goto error_gpio;
            }
            gpio_direction_output(dac33->power_gpio, 0);
      } else {
            dac33->chip_power = 1;
      }

      /* Check if the IRQ number is valid and request it */
      if (dac33->irq >= 0) {
            ret = request_irq(dac33->irq, dac33_interrupt_handler,
                          IRQF_TRIGGER_RISING | IRQF_DISABLED,
                          codec->name, codec);
            if (ret < 0) {
                  dev_err(codec->dev, "Could not request IRQ%d (%d)\n",
                                    dac33->irq, ret);
                  dac33->irq = -1;
            }
            if (dac33->irq != -1) {
                  /* Setup work queue */
                  dac33->dac33_wq =
                        create_singlethread_workqueue("tlv320dac33");
                  if (dac33->dac33_wq == NULL) {
                        free_irq(dac33->irq, &dac33->codec);
                        ret = -ENOMEM;
                        goto error_wq;
                  }

                  INIT_WORK(&dac33->work, dac33_work);
            }
      }

      for (i = 0; i < ARRAY_SIZE(dac33->supplies); i++)
            dac33->supplies[i].supply = dac33_supply_names[i];

      ret = regulator_bulk_get(codec->dev, ARRAY_SIZE(dac33->supplies),
                         dac33->supplies);

      if (ret != 0) {
            dev_err(codec->dev, "Failed to request supplies: %d\n", ret);
            goto err_get;
      }

      ret = regulator_bulk_enable(ARRAY_SIZE(dac33->supplies),
                            dac33->supplies);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to enable supplies: %d\n", ret);
            goto err_enable;
      }

      ret = snd_soc_register_codec(codec);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register codec: %d\n", ret);
            goto error_codec;
      }

      ret = snd_soc_register_dai(&dac33_dai);
      if (ret != 0) {
            dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
            snd_soc_unregister_codec(codec);
            goto error_codec;
      }

      /* Shut down the codec for now */
      dac33_hard_power(codec, 0);

      return ret;

error_codec:
      regulator_bulk_disable(ARRAY_SIZE(dac33->supplies), dac33->supplies);
err_enable:
      regulator_bulk_free(ARRAY_SIZE(dac33->supplies), dac33->supplies);
err_get:
      if (dac33->irq >= 0) {
            free_irq(dac33->irq, &dac33->codec);
            destroy_workqueue(dac33->dac33_wq);
      }
error_wq:
      if (dac33->power_gpio >= 0)
            gpio_free(dac33->power_gpio);
error_gpio:
      kfree(codec->reg_cache);
error_reg:
      tlv320dac33_codec = NULL;
      kfree(dac33);

      return ret;
}

static int dac33_i2c_remove(struct i2c_client *client)
{
      struct tlv320dac33_priv *dac33;

      dac33 = i2c_get_clientdata(client);
      dac33_hard_power(&dac33->codec, 0);

      if (dac33->power_gpio >= 0)
            gpio_free(dac33->power_gpio);
      if (dac33->irq >= 0)
            free_irq(dac33->irq, &dac33->codec);

      regulator_bulk_free(ARRAY_SIZE(dac33->supplies), dac33->supplies);

      destroy_workqueue(dac33->dac33_wq);
      snd_soc_unregister_dai(&dac33_dai);
      snd_soc_unregister_codec(&dac33->codec);
      kfree(dac33->codec.reg_cache);
      kfree(dac33);
      tlv320dac33_codec = NULL;

      return 0;
}

static const struct i2c_device_id tlv320dac33_i2c_id[] = {
      {
            .name = "tlv320dac33",
            .driver_data = 0,
      },
      { },
};

static struct i2c_driver tlv320dac33_i2c_driver = {
      .driver = {
            .name = "tlv320dac33",
            .owner = THIS_MODULE,
      },
      .probe            = dac33_i2c_probe,
      .remove           = __devexit_p(dac33_i2c_remove),
      .id_table   = tlv320dac33_i2c_id,
};

static int __init dac33_module_init(void)
{
      int r;
      r = i2c_add_driver(&tlv320dac33_i2c_driver);
      if (r < 0) {
            printk(KERN_ERR "DAC33: driver registration failed\n");
            return r;
      }
      return 0;
}
module_init(dac33_module_init);

static void __exit dac33_module_exit(void)
{
      i2c_del_driver(&tlv320dac33_i2c_driver);
}
module_exit(dac33_module_exit);


MODULE_DESCRIPTION("ASoC TLV320DAC33 codec driver");
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@nokia.com>");
MODULE_LICENSE("GPL");

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