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at73c213.c

/*
 * Driver for AT73C213 16-bit stereo DAC connected to Atmel SSC
 *
 * Copyright (C) 2006-2007 Atmel Norway
 *
 * 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.
 */

/*#define DEBUG*/

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/io.h>

#include <sound/initval.h>
#include <sound/control.h>
#include <sound/core.h>
#include <sound/pcm.h>

#include <linux/atmel-ssc.h>

#include <linux/spi/spi.h>
#include <linux/spi/at73c213.h>

#include "at73c213.h"

#define BITRATE_MIN      8000 /* Hardware limit? */
#define BITRATE_TARGET  CONFIG_SND_AT73C213_TARGET_BITRATE
#define BITRATE_MAX     50000 /* Hardware limit. */

/* Initial (hardware reset) AT73C213 register values. */
static u8 snd_at73c213_original_image[18] =
{
      0x00, /* 00 - CTRL    */
      0x05, /* 01 - LLIG    */
      0x05, /* 02 - RLIG    */
      0x08, /* 03 - LPMG    */
      0x08, /* 04 - RPMG    */
      0x00, /* 05 - LLOG    */
      0x00, /* 06 - RLOG    */
      0x22, /* 07 - OLC     */
      0x09, /* 08 - MC      */
      0x00, /* 09 - CSFC    */
      0x00, /* 0A - MISC    */
      0x00, /* 0B -         */
      0x00, /* 0C - PRECH   */
      0x05, /* 0D - AUXG    */
      0x00, /* 0E -         */
      0x00, /* 0F -         */
      0x00, /* 10 - RST     */
      0x00, /* 11 - PA_CTRL */
};

struct snd_at73c213 {
      struct snd_card               *card;
      struct snd_pcm                *pcm;
      struct snd_pcm_substream      *substream;
      struct at73c213_board_info    *board;
      int                     irq;
      int                     period;
      unsigned long                 bitrate;
      struct clk              *bitclk;
      struct ssc_device       *ssc;
      struct spi_device       *spi;
      u8                      spi_wbuffer[2];
      u8                      spi_rbuffer[2];
      /* Image of the SPI registers in AT73C213. */
      u8                      reg_image[18];
      /* Protect SSC registers against concurrent access. */
      spinlock_t              lock;
      /* Protect mixer registers against concurrent access. */
      struct mutex                  mixer_lock;
};

#define get_chip(card) ((struct snd_at73c213 *)card->private_data)

static int
snd_at73c213_write_reg(struct snd_at73c213 *chip, u8 reg, u8 val)
{
      struct spi_message msg;
      struct spi_transfer msg_xfer = {
            .len        = 2,
            .cs_change  = 0,
      };
      int retval;

      spi_message_init(&msg);

      chip->spi_wbuffer[0] = reg;
      chip->spi_wbuffer[1] = val;

      msg_xfer.tx_buf = chip->spi_wbuffer;
      msg_xfer.rx_buf = chip->spi_rbuffer;
      spi_message_add_tail(&msg_xfer, &msg);

      retval = spi_sync(chip->spi, &msg);

      if (!retval)
            chip->reg_image[reg] = val;

      return retval;
}

static struct snd_pcm_hardware snd_at73c213_playback_hw = {
      .info       = SNDRV_PCM_INFO_INTERLEAVED |
                    SNDRV_PCM_INFO_BLOCK_TRANSFER,
      .formats    = SNDRV_PCM_FMTBIT_S16_BE,
      .rates            = SNDRV_PCM_RATE_CONTINUOUS,
      .rate_min   = 8000,  /* Replaced by chip->bitrate later. */
      .rate_max   = 50000, /* Replaced by chip->bitrate later. */
      .channels_min     = 1,
      .channels_max     = 2,
      .buffer_bytes_max = 64 * 1024 - 1,
      .period_bytes_min = 512,
      .period_bytes_max = 64 * 1024 - 1,
      .periods_min      = 4,
      .periods_max      = 1024,
};

/*
 * Calculate and set bitrate and divisions.
 */
static int snd_at73c213_set_bitrate(struct snd_at73c213 *chip)
{
      unsigned long ssc_rate = clk_get_rate(chip->ssc->clk);
      unsigned long dac_rate_new, ssc_div;
      int status;
      unsigned long ssc_div_max, ssc_div_min;
      int max_tries;

      /*
       * We connect two clocks here, picking divisors so the I2S clocks
       * out data at the same rate the DAC clocks it in ... and as close
       * as practical to the desired target rate.
       *
       * The DAC master clock (MCLK) is programmable, and is either 256
       * or (not here) 384 times the I2S output clock (BCLK).
       */

      /* SSC clock / (bitrate * stereo * 16-bit). */
      ssc_div = ssc_rate / (BITRATE_TARGET * 2 * 16);
      ssc_div_min = ssc_rate / (BITRATE_MAX * 2 * 16);
      ssc_div_max = ssc_rate / (BITRATE_MIN * 2 * 16);
      max_tries = (ssc_div_max - ssc_div_min) / 2;

      if (max_tries < 1)
            max_tries = 1;

      /* ssc_div must be a power of 2. */
      ssc_div = (ssc_div + 1) & ~1UL;

      if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN) {
            ssc_div -= 2;
            if ((ssc_rate / (ssc_div * 2 * 16)) > BITRATE_MAX)
                  return -ENXIO;
      }

      /* Search for a possible bitrate. */
      do {
            /* SSC clock / (ssc divider * 16-bit * stereo). */
            if ((ssc_rate / (ssc_div * 2 * 16)) < BITRATE_MIN)
                  return -ENXIO;

            /* 256 / (2 * 16) = 8 */
            dac_rate_new = 8 * (ssc_rate / ssc_div);

            status = clk_round_rate(chip->board->dac_clk, dac_rate_new);
            if (status < 0)
                  return status;

            /* Ignore difference smaller than 256 Hz. */
            if ((status/256) == (dac_rate_new/256))
                  goto set_rate;

            ssc_div += 2;
      } while (--max_tries);

      /* Not able to find a valid bitrate. */
      return -ENXIO;

set_rate:
      status = clk_set_rate(chip->board->dac_clk, status);
      if (status < 0)
            return status;

      /* Set divider in SSC device. */
      ssc_writel(chip->ssc->regs, CMR, ssc_div/2);

      /* SSC clock / (ssc divider * 16-bit * stereo). */
      chip->bitrate = ssc_rate / (ssc_div * 16 * 2);

      dev_info(&chip->spi->dev,
                  "at73c213: supported bitrate is %lu (%lu divider)\n",
                  chip->bitrate, ssc_div);

      return 0;
}

static int snd_at73c213_pcm_open(struct snd_pcm_substream *substream)
{
      struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      int err;

      /* ensure buffer_size is a multiple of period_size */
      err = snd_pcm_hw_constraint_integer(runtime,
                              SNDRV_PCM_HW_PARAM_PERIODS);
      if (err < 0)
            return err;
      snd_at73c213_playback_hw.rate_min = chip->bitrate;
      snd_at73c213_playback_hw.rate_max = chip->bitrate;
      runtime->hw = snd_at73c213_playback_hw;
      chip->substream = substream;

      return 0;
}

static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
{
      struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
      chip->substream = NULL;
      return 0;
}

static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
                         struct snd_pcm_hw_params *hw_params)
{
      struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
      int channels = params_channels(hw_params);
      int val;

      val = ssc_readl(chip->ssc->regs, TFMR);
      val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
      ssc_writel(chip->ssc->regs, TFMR, val);

      return snd_pcm_lib_malloc_pages(substream,
                              params_buffer_bytes(hw_params));
}

static int snd_at73c213_pcm_hw_free(struct snd_pcm_substream *substream)
{
      return snd_pcm_lib_free_pages(substream);
}

static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
{
      struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      int block_size;

      block_size = frames_to_bytes(runtime, runtime->period_size);

      chip->period = 0;

      ssc_writel(chip->ssc->regs, PDC_TPR,
                  (long)runtime->dma_addr);
      ssc_writel(chip->ssc->regs, PDC_TCR,
                  runtime->period_size * runtime->channels);
      ssc_writel(chip->ssc->regs, PDC_TNPR,
                  (long)runtime->dma_addr + block_size);
      ssc_writel(chip->ssc->regs, PDC_TNCR,
                  runtime->period_size * runtime->channels);

      return 0;
}

static int snd_at73c213_pcm_trigger(struct snd_pcm_substream *substream,
                           int cmd)
{
      struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
      int retval = 0;

      spin_lock(&chip->lock);

      switch (cmd) {
      case SNDRV_PCM_TRIGGER_START:
            ssc_writel(chip->ssc->regs, IER, SSC_BIT(IER_ENDTX));
            ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTEN));
            break;
      case SNDRV_PCM_TRIGGER_STOP:
            ssc_writel(chip->ssc->regs, PDC_PTCR, SSC_BIT(PDC_PTCR_TXTDIS));
            ssc_writel(chip->ssc->regs, IDR, SSC_BIT(IDR_ENDTX));
            break;
      default:
            dev_dbg(&chip->spi->dev, "spurious command %x\n", cmd);
            retval = -EINVAL;
            break;
      }

      spin_unlock(&chip->lock);

      return retval;
}

static snd_pcm_uframes_t
snd_at73c213_pcm_pointer(struct snd_pcm_substream *substream)
{
      struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;
      snd_pcm_uframes_t pos;
      unsigned long bytes;

      bytes = ssc_readl(chip->ssc->regs, PDC_TPR)
            - (unsigned long)runtime->dma_addr;

      pos = bytes_to_frames(runtime, bytes);
      if (pos >= runtime->buffer_size)
            pos -= runtime->buffer_size;

      return pos;
}

static struct snd_pcm_ops at73c213_playback_ops = {
      .open       = snd_at73c213_pcm_open,
      .close            = snd_at73c213_pcm_close,
      .ioctl            = snd_pcm_lib_ioctl,
      .hw_params  = snd_at73c213_pcm_hw_params,
      .hw_free    = snd_at73c213_pcm_hw_free,
      .prepare    = snd_at73c213_pcm_prepare,
      .trigger    = snd_at73c213_pcm_trigger,
      .pointer    = snd_at73c213_pcm_pointer,
};

static int __devinit snd_at73c213_pcm_new(struct snd_at73c213 *chip, int device)
{
      struct snd_pcm *pcm;
      int retval;

      retval = snd_pcm_new(chip->card, chip->card->shortname,
                  device, 1, 0, &pcm);
      if (retval < 0)
            goto out;

      pcm->private_data = chip;
      pcm->info_flags = SNDRV_PCM_INFO_BLOCK_TRANSFER;
      strcpy(pcm->name, "at73c213");
      chip->pcm = pcm;

      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &at73c213_playback_ops);

      retval = snd_pcm_lib_preallocate_pages_for_all(chip->pcm,
                  SNDRV_DMA_TYPE_DEV, &chip->ssc->pdev->dev,
                  64 * 1024, 64 * 1024);
out:
      return retval;
}

static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
{
      struct snd_at73c213 *chip = dev_id;
      struct snd_pcm_runtime *runtime = chip->substream->runtime;
      u32 status;
      int offset;
      int block_size;
      int next_period;
      int retval = IRQ_NONE;

      spin_lock(&chip->lock);

      block_size = frames_to_bytes(runtime, runtime->period_size);
      status = ssc_readl(chip->ssc->regs, IMR);

      if (status & SSC_BIT(IMR_ENDTX)) {
            chip->period++;
            if (chip->period == runtime->periods)
                  chip->period = 0;
            next_period = chip->period + 1;
            if (next_period == runtime->periods)
                  next_period = 0;

            offset = block_size * next_period;

            ssc_writel(chip->ssc->regs, PDC_TNPR,
                        (long)runtime->dma_addr + offset);
            ssc_writel(chip->ssc->regs, PDC_TNCR,
                        runtime->period_size * runtime->channels);
            retval = IRQ_HANDLED;
      }

      ssc_readl(chip->ssc->regs, IMR);
      spin_unlock(&chip->lock);

      if (status & SSC_BIT(IMR_ENDTX))
            snd_pcm_period_elapsed(chip->substream);

      return retval;
}

/*
 * Mixer functions.
 */
static int snd_at73c213_mono_get(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
      int reg = kcontrol->private_value & 0xff;
      int shift = (kcontrol->private_value >> 8) & 0xff;
      int mask = (kcontrol->private_value >> 16) & 0xff;
      int invert = (kcontrol->private_value >> 24) & 0xff;

      mutex_lock(&chip->mixer_lock);

      ucontrol->value.integer.value[0] =
            (chip->reg_image[reg] >> shift) & mask;

      if (invert)
            ucontrol->value.integer.value[0] =
                  mask - ucontrol->value.integer.value[0];

      mutex_unlock(&chip->mixer_lock);

      return 0;
}

static int snd_at73c213_mono_put(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
      int reg = kcontrol->private_value & 0xff;
      int shift = (kcontrol->private_value >> 8) & 0xff;
      int mask = (kcontrol->private_value >> 16) & 0xff;
      int invert = (kcontrol->private_value >> 24) & 0xff;
      int change, retval;
      unsigned short val;

      val = (ucontrol->value.integer.value[0] & mask);
      if (invert)
            val = mask - val;
      val <<= shift;

      mutex_lock(&chip->mixer_lock);

      val = (chip->reg_image[reg] & ~(mask << shift)) | val;
      change = val != chip->reg_image[reg];
      retval = snd_at73c213_write_reg(chip, reg, val);

      mutex_unlock(&chip->mixer_lock);

      if (retval)
            return retval;

      return change;
}

static int snd_at73c213_stereo_info(struct snd_kcontrol *kcontrol,
                          struct snd_ctl_elem_info *uinfo)
{
      int mask = (kcontrol->private_value >> 24) & 0xff;

      if (mask == 1)
            uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
      else
            uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;

      uinfo->count = 2;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = mask;

      return 0;
}

static int snd_at73c213_stereo_get(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
      int left_reg = kcontrol->private_value & 0xff;
      int right_reg = (kcontrol->private_value >> 8) & 0xff;
      int shift_left = (kcontrol->private_value >> 16) & 0x07;
      int shift_right = (kcontrol->private_value >> 19) & 0x07;
      int mask = (kcontrol->private_value >> 24) & 0xff;
      int invert = (kcontrol->private_value >> 22) & 1;

      mutex_lock(&chip->mixer_lock);

      ucontrol->value.integer.value[0] =
            (chip->reg_image[left_reg] >> shift_left) & mask;
      ucontrol->value.integer.value[1] =
            (chip->reg_image[right_reg] >> shift_right) & mask;

      if (invert) {
            ucontrol->value.integer.value[0] =
                  mask - ucontrol->value.integer.value[0];
            ucontrol->value.integer.value[1] =
                  mask - ucontrol->value.integer.value[1];
      }

      mutex_unlock(&chip->mixer_lock);

      return 0;
}

static int snd_at73c213_stereo_put(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
      int left_reg = kcontrol->private_value & 0xff;
      int right_reg = (kcontrol->private_value >> 8) & 0xff;
      int shift_left = (kcontrol->private_value >> 16) & 0x07;
      int shift_right = (kcontrol->private_value >> 19) & 0x07;
      int mask = (kcontrol->private_value >> 24) & 0xff;
      int invert = (kcontrol->private_value >> 22) & 1;
      int change, retval;
      unsigned short val1, val2;

      val1 = ucontrol->value.integer.value[0] & mask;
      val2 = ucontrol->value.integer.value[1] & mask;
      if (invert) {
            val1 = mask - val1;
            val2 = mask - val2;
      }
      val1 <<= shift_left;
      val2 <<= shift_right;

      mutex_lock(&chip->mixer_lock);

      val1 = (chip->reg_image[left_reg] & ~(mask << shift_left)) | val1;
      val2 = (chip->reg_image[right_reg] & ~(mask << shift_right)) | val2;
      change = val1 != chip->reg_image[left_reg]
            || val2 != chip->reg_image[right_reg];
      retval = snd_at73c213_write_reg(chip, left_reg, val1);
      if (retval) {
            mutex_unlock(&chip->mixer_lock);
            goto out;
      }
      retval = snd_at73c213_write_reg(chip, right_reg, val2);
      if (retval) {
            mutex_unlock(&chip->mixer_lock);
            goto out;
      }

      mutex_unlock(&chip->mixer_lock);

      return change;

out:
      return retval;
}

#define snd_at73c213_mono_switch_info     snd_ctl_boolean_mono_info

static int snd_at73c213_mono_switch_get(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
      int reg = kcontrol->private_value & 0xff;
      int shift = (kcontrol->private_value >> 8) & 0xff;
      int invert = (kcontrol->private_value >> 24) & 0xff;

      mutex_lock(&chip->mixer_lock);

      ucontrol->value.integer.value[0] =
            (chip->reg_image[reg] >> shift) & 0x01;

      if (invert)
            ucontrol->value.integer.value[0] =
                  0x01 - ucontrol->value.integer.value[0];

      mutex_unlock(&chip->mixer_lock);

      return 0;
}

static int snd_at73c213_mono_switch_put(struct snd_kcontrol *kcontrol,
                         struct snd_ctl_elem_value *ucontrol)
{
      struct snd_at73c213 *chip = snd_kcontrol_chip(kcontrol);
      int reg = kcontrol->private_value & 0xff;
      int shift = (kcontrol->private_value >> 8) & 0xff;
      int mask = (kcontrol->private_value >> 16) & 0xff;
      int invert = (kcontrol->private_value >> 24) & 0xff;
      int change, retval;
      unsigned short val;

      if (ucontrol->value.integer.value[0])
            val = mask;
      else
            val = 0;

      if (invert)
            val = mask - val;
      val <<= shift;

      mutex_lock(&chip->mixer_lock);

      val |= (chip->reg_image[reg] & ~(mask << shift));
      change = val != chip->reg_image[reg];

      retval = snd_at73c213_write_reg(chip, reg, val);

      mutex_unlock(&chip->mixer_lock);

      if (retval)
            return retval;

      return change;
}

static int snd_at73c213_pa_volume_info(struct snd_kcontrol *kcontrol,
                          struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      uinfo->value.integer.min = 0;
      uinfo->value.integer.max = ((kcontrol->private_value >> 16) & 0xff) - 1;

      return 0;
}

static int snd_at73c213_line_capture_volume_info(
            struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 2;
      /* When inverted will give values 0x10001 => 0. */
      uinfo->value.integer.min = 14;
      uinfo->value.integer.max = 31;

      return 0;
}

static int snd_at73c213_aux_capture_volume_info(
            struct snd_kcontrol *kcontrol,
            struct snd_ctl_elem_info *uinfo)
{
      uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
      uinfo->count = 1;
      /* When inverted will give values 0x10001 => 0. */
      uinfo->value.integer.min = 14;
      uinfo->value.integer.max = 31;

      return 0;
}

#define AT73C213_MONO_SWITCH(xname, xindex, reg, shift, mask, invert)   \
{                                                     \
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,                        \
      .name = xname,                                        \
      .index = xindex,                                \
      .info = snd_at73c213_mono_switch_info,                      \
      .get = snd_at73c213_mono_switch_get,                        \
      .put = snd_at73c213_mono_switch_put,                        \
      .private_value = (reg | (shift << 8) | (mask << 16) | (invert << 24)) \
}

#define AT73C213_STEREO(xname, xindex, left_reg, right_reg, shift_left, shift_right, mask, invert) \
{                                                     \
      .iface = SNDRV_CTL_ELEM_IFACE_MIXER,                        \
      .name = xname,                                        \
      .index = xindex,                                \
      .info = snd_at73c213_stereo_info,                     \
      .get = snd_at73c213_stereo_get,                             \
      .put = snd_at73c213_stereo_put,                             \
      .private_value = (left_reg | (right_reg << 8)               \
                  | (shift_left << 16) | (shift_right << 19)      \
                  | (mask << 24) | (invert << 22))          \
}

static struct snd_kcontrol_new snd_at73c213_controls[] __devinitdata = {
AT73C213_STEREO("Master Playback Volume", 0, DAC_LMPG, DAC_RMPG, 0, 0, 0x1f, 1),
AT73C213_STEREO("Master Playback Switch", 0, DAC_LMPG, DAC_RMPG, 5, 5, 1, 1),
AT73C213_STEREO("PCM Playback Volume", 0, DAC_LLOG, DAC_RLOG, 0, 0, 0x1f, 1),
AT73C213_STEREO("PCM Playback Switch", 0, DAC_LLOG, DAC_RLOG, 5, 5, 1, 1),
AT73C213_MONO_SWITCH("Mono PA Playback Switch", 0, DAC_CTRL, DAC_CTRL_ONPADRV,
                 0x01, 0),
{
      .iface      = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "PA Playback Volume",
      .index      = 0,
      .info = snd_at73c213_pa_volume_info,
      .get  = snd_at73c213_mono_get,
      .put  = snd_at73c213_mono_put,
      .private_value    = PA_CTRL | (PA_CTRL_APAGAIN << 8) | \
            (0x0f << 16) | (1 << 24),
},
AT73C213_MONO_SWITCH("PA High Gain Playback Switch", 0, PA_CTRL, PA_CTRL_APALP,
                 0x01, 1),
AT73C213_MONO_SWITCH("PA Playback Switch", 0, PA_CTRL, PA_CTRL_APAON, 0x01, 0),
{
      .iface      = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Aux Capture Volume",
      .index      = 0,
      .info = snd_at73c213_aux_capture_volume_info,
      .get  = snd_at73c213_mono_get,
      .put  = snd_at73c213_mono_put,
      .private_value    = DAC_AUXG | (0 << 8) | (0x1f << 16) | (1 << 24),
},
AT73C213_MONO_SWITCH("Aux Capture Switch", 0, DAC_CTRL, DAC_CTRL_ONAUXIN,
                 0x01, 0),
{
      .iface      = SNDRV_CTL_ELEM_IFACE_MIXER,
      .name = "Line Capture Volume",
      .index      = 0,
      .info = snd_at73c213_line_capture_volume_info,
      .get  = snd_at73c213_stereo_get,
      .put  = snd_at73c213_stereo_put,
      .private_value    = DAC_LLIG | (DAC_RLIG << 8) | (0 << 16) | (0 << 19)
            | (0x1f << 24) | (1 << 22),
},
AT73C213_MONO_SWITCH("Line Capture Switch", 0, DAC_CTRL, 0, 0x03, 0),
};

static int __devinit snd_at73c213_mixer(struct snd_at73c213 *chip)
{
      struct snd_card *card;
      int errval, idx;

      if (chip == NULL || chip->pcm == NULL)
            return -EINVAL;

      card = chip->card;

      strcpy(card->mixername, chip->pcm->name);

      for (idx = 0; idx < ARRAY_SIZE(snd_at73c213_controls); idx++) {
            errval = snd_ctl_add(card,
                        snd_ctl_new1(&snd_at73c213_controls[idx],
                              chip));
            if (errval < 0)
                  goto cleanup;
      }

      return 0;

cleanup:
      for (idx = 1; idx < ARRAY_SIZE(snd_at73c213_controls) + 1; idx++) {
            struct snd_kcontrol *kctl;
            kctl = snd_ctl_find_numid(card, idx);
            if (kctl)
                  snd_ctl_remove(card, kctl);
      }
      return errval;
}

/*
 * Device functions
 */
static int __devinit snd_at73c213_ssc_init(struct snd_at73c213 *chip)
{
      /*
       * Continuous clock output.
       * Starts on falling TF.
       * Delay 1 cycle (1 bit).
       * Periode is 16 bit (16 - 1).
       */
      ssc_writel(chip->ssc->regs, TCMR,
                  SSC_BF(TCMR_CKO, 1)
                  | SSC_BF(TCMR_START, 4)
                  | SSC_BF(TCMR_STTDLY, 1)
                  | SSC_BF(TCMR_PERIOD, 16 - 1));
      /*
       * Data length is 16 bit (16 - 1).
       * Transmit MSB first.
       * Transmit 2 words each transfer.
       * Frame sync length is 16 bit (16 - 1).
       * Frame starts on negative pulse.
       */
      ssc_writel(chip->ssc->regs, TFMR,
                  SSC_BF(TFMR_DATLEN, 16 - 1)
                  | SSC_BIT(TFMR_MSBF)
                  | SSC_BF(TFMR_DATNB, 1)
                  | SSC_BF(TFMR_FSLEN, 16 - 1)
                  | SSC_BF(TFMR_FSOS, 1));

      return 0;
}

static int __devinit snd_at73c213_chip_init(struct snd_at73c213 *chip)
{
      int retval;
      unsigned char dac_ctrl = 0;

      retval = snd_at73c213_set_bitrate(chip);
      if (retval)
            goto out;

      /* Enable DAC master clock. */
      clk_enable(chip->board->dac_clk);

      /* Initialize at73c213 on SPI bus. */
      retval = snd_at73c213_write_reg(chip, DAC_RST, 0x04);
      if (retval)
            goto out_clk;
      msleep(1);
      retval = snd_at73c213_write_reg(chip, DAC_RST, 0x03);
      if (retval)
            goto out_clk;

      /* Precharge everything. */
      retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0xff);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, PA_CTRL, (1<<PA_CTRL_APAPRECH));
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_CTRL,
                  (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR));
      if (retval)
            goto out_clk;

      msleep(50);

      /* Stop precharging PA. */
      retval = snd_at73c213_write_reg(chip, PA_CTRL,
                  (1<<PA_CTRL_APALP) | 0x0f);
      if (retval)
            goto out_clk;

      msleep(450);

      /* Stop precharging DAC, turn on master power. */
      retval = snd_at73c213_write_reg(chip, DAC_PRECH, (1<<DAC_PRECH_ONMSTR));
      if (retval)
            goto out_clk;

      msleep(1);

      /* Turn on DAC. */
      dac_ctrl = (1<<DAC_CTRL_ONDACL) | (1<<DAC_CTRL_ONDACR)
            | (1<<DAC_CTRL_ONLNOL) | (1<<DAC_CTRL_ONLNOR);

      retval = snd_at73c213_write_reg(chip, DAC_CTRL, dac_ctrl);
      if (retval)
            goto out_clk;

      /* Mute sound. */
      retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
      if (retval)
            goto out_clk;
      retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
      if (retval)
            goto out_clk;

      /* Enable I2S device, i.e. clock output. */
      ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));

      goto out;

out_clk:
      clk_disable(chip->board->dac_clk);
out:
      return retval;
}

static int snd_at73c213_dev_free(struct snd_device *device)
{
      struct snd_at73c213 *chip = device->device_data;

      ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
      if (chip->irq >= 0) {
            free_irq(chip->irq, chip);
            chip->irq = -1;
      }

      return 0;
}

static int __devinit snd_at73c213_dev_init(struct snd_card *card,
                               struct spi_device *spi)
{
      static struct snd_device_ops ops = {
            .dev_free   = snd_at73c213_dev_free,
      };
      struct snd_at73c213 *chip = get_chip(card);
      int irq, retval;

      irq = chip->ssc->irq;
      if (irq < 0)
            return irq;

      spin_lock_init(&chip->lock);
      mutex_init(&chip->mixer_lock);
      chip->card = card;
      chip->irq = -1;

      retval = request_irq(irq, snd_at73c213_interrupt, 0, "at73c213", chip);
      if (retval) {
            dev_dbg(&chip->spi->dev, "unable to request irq %d\n", irq);
            goto out;
      }
      chip->irq = irq;

      memcpy(&chip->reg_image, &snd_at73c213_original_image,
                  sizeof(snd_at73c213_original_image));

      retval = snd_at73c213_ssc_init(chip);
      if (retval)
            goto out_irq;

      retval = snd_at73c213_chip_init(chip);
      if (retval)
            goto out_irq;

      retval = snd_at73c213_pcm_new(chip, 0);
      if (retval)
            goto out_irq;

      retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
      if (retval)
            goto out_irq;

      retval = snd_at73c213_mixer(chip);
      if (retval)
            goto out_snd_dev;

      snd_card_set_dev(card, &spi->dev);

      goto out;

out_snd_dev:
      snd_device_free(card, chip);
out_irq:
      free_irq(chip->irq, chip);
      chip->irq = -1;
out:
      return retval;
}

static int __devinit snd_at73c213_probe(struct spi_device *spi)
{
      struct snd_card               *card;
      struct snd_at73c213           *chip;
      struct at73c213_board_info    *board;
      int                     retval;
      char                    id[16];

      board = spi->dev.platform_data;
      if (!board) {
            dev_dbg(&spi->dev, "no platform_data\n");
            return -ENXIO;
      }

      if (!board->dac_clk) {
            dev_dbg(&spi->dev, "no DAC clk\n");
            return -ENXIO;
      }

      if (IS_ERR(board->dac_clk)) {
            dev_dbg(&spi->dev, "no DAC clk\n");
            return PTR_ERR(board->dac_clk);
      }

      /* Allocate "card" using some unused identifiers. */
      snprintf(id, sizeof id, "at73c213_%d", board->ssc_id);
      retval = snd_card_create(-1, id, THIS_MODULE,
                         sizeof(struct snd_at73c213), &card);
      if (retval < 0)
            goto out;

      chip = card->private_data;
      chip->spi = spi;
      chip->board = board;

      chip->ssc = ssc_request(board->ssc_id);
      if (IS_ERR(chip->ssc)) {
            dev_dbg(&spi->dev, "could not get ssc%d device\n",
                        board->ssc_id);
            retval = PTR_ERR(chip->ssc);
            goto out_card;
      }

      retval = snd_at73c213_dev_init(card, spi);
      if (retval)
            goto out_ssc;

      strcpy(card->driver, "at73c213");
      strcpy(card->shortname, board->shortname);
      sprintf(card->longname, "%s on irq %d", card->shortname, chip->irq);

      retval = snd_card_register(card);
      if (retval)
            goto out_ssc;

      dev_set_drvdata(&spi->dev, card);

      goto out;

out_ssc:
      ssc_free(chip->ssc);
out_card:
      snd_card_free(card);
out:
      return retval;
}

static int __devexit snd_at73c213_remove(struct spi_device *spi)
{
      struct snd_card *card = dev_get_drvdata(&spi->dev);
      struct snd_at73c213 *chip = card->private_data;
      int retval;

      /* Stop playback. */
      ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));

      /* Mute sound. */
      retval = snd_at73c213_write_reg(chip, DAC_LMPG, 0x3f);
      if (retval)
            goto out;
      retval = snd_at73c213_write_reg(chip, DAC_RMPG, 0x3f);
      if (retval)
            goto out;
      retval = snd_at73c213_write_reg(chip, DAC_LLOG, 0x3f);
      if (retval)
            goto out;
      retval = snd_at73c213_write_reg(chip, DAC_RLOG, 0x3f);
      if (retval)
            goto out;
      retval = snd_at73c213_write_reg(chip, DAC_LLIG, 0x11);
      if (retval)
            goto out;
      retval = snd_at73c213_write_reg(chip, DAC_RLIG, 0x11);
      if (retval)
            goto out;
      retval = snd_at73c213_write_reg(chip, DAC_AUXG, 0x11);
      if (retval)
            goto out;

      /* Turn off PA. */
      retval = snd_at73c213_write_reg(chip, PA_CTRL,
                              chip->reg_image[PA_CTRL] | 0x0f);
      if (retval)
            goto out;
      msleep(10);
      retval = snd_at73c213_write_reg(chip, PA_CTRL,
                              (1 << PA_CTRL_APALP) | 0x0f);
      if (retval)
            goto out;

      /* Turn off external DAC. */
      retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x0c);
      if (retval)
            goto out;
      msleep(2);
      retval = snd_at73c213_write_reg(chip, DAC_CTRL, 0x00);
      if (retval)
            goto out;

      /* Turn off master power. */
      retval = snd_at73c213_write_reg(chip, DAC_PRECH, 0x00);
      if (retval)
            goto out;

out:
      /* Stop DAC master clock. */
      clk_disable(chip->board->dac_clk);

      ssc_free(chip->ssc);
      snd_card_free(card);
      dev_set_drvdata(&spi->dev, NULL);

      return 0;
}

#ifdef CONFIG_PM
static int snd_at73c213_suspend(struct spi_device *spi, pm_message_t msg)
{
      struct snd_card *card = dev_get_drvdata(&spi->dev);
      struct snd_at73c213 *chip = card->private_data;

      ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXDIS));
      clk_disable(chip->board->dac_clk);

      return 0;
}

static int snd_at73c213_resume(struct spi_device *spi)
{
      struct snd_card *card = dev_get_drvdata(&spi->dev);
      struct snd_at73c213 *chip = card->private_data;

      clk_enable(chip->board->dac_clk);
      ssc_writel(chip->ssc->regs, CR, SSC_BIT(CR_TXEN));

      return 0;
}
#else
#define snd_at73c213_suspend NULL
#define snd_at73c213_resume NULL
#endif

static struct spi_driver at73c213_driver = {
      .driver           = {
            .name = "at73c213",
      },
      .probe            = snd_at73c213_probe,
      .suspend    = snd_at73c213_suspend,
      .resume           = snd_at73c213_resume,
      .remove           = __devexit_p(snd_at73c213_remove),
};

static int __init at73c213_init(void)
{
      return spi_register_driver(&at73c213_driver);
}
module_init(at73c213_init);

static void __exit at73c213_exit(void)
{
      spi_unregister_driver(&at73c213_driver);
}
module_exit(at73c213_exit);

MODULE_AUTHOR("Hans-Christian Egtvedt <hcegtvedt@atmel.com>");
MODULE_DESCRIPTION("Sound driver for AT73C213 with Atmel SSC");
MODULE_LICENSE("GPL");

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