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* File: sound/soc/codecs/ad1836.c
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* Author: Barry Song <Barry.Song@analog.com>
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* Description: Driver for AD1836 sound chip
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* Copyright 2009 Analog Devices Inc.
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/initval.h>
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#include <sound/soc.h>
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#include <sound/tlv.h>
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#include <sound/soc-dapm.h>
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#include <linux/spi/spi.h>
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/* codec private data */
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struct snd_soc_codec codec;
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u16 reg_cache[AD1836_NUM_REGS];
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static struct snd_soc_codec *ad1836_codec;
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struct snd_soc_codec_device soc_codec_dev_ad1836;
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static int ad1836_register(struct ad1836_priv *ad1836);
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static void ad1836_unregister(struct ad1836_priv *ad1836);
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* AD1836 volume/mute/de-emphasis etc. controls
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static const char *ad1836_deemp[] = {"None", "44.1kHz", "32kHz", "48kHz"};
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static const struct soc_enum ad1836_deemp_enum =
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SOC_ENUM_SINGLE(AD1836_DAC_CTRL1, 8, 4, ad1836_deemp);
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static const struct snd_kcontrol_new ad1836_snd_controls[] = {
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/* DAC volume control */
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SOC_DOUBLE_R("DAC1 Volume", AD1836_DAC_L1_VOL,
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AD1836_DAC_R1_VOL, 0, 0x3FF, 0),
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SOC_DOUBLE_R("DAC2 Volume", AD1836_DAC_L2_VOL,
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AD1836_DAC_R2_VOL, 0, 0x3FF, 0),
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SOC_DOUBLE_R("DAC3 Volume", AD1836_DAC_L3_VOL,
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AD1836_DAC_R3_VOL, 0, 0x3FF, 0),
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/* ADC switch control */
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SOC_DOUBLE("ADC1 Switch", AD1836_ADC_CTRL2, AD1836_ADCL1_MUTE,
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AD1836_ADCR1_MUTE, 1, 1),
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SOC_DOUBLE("ADC2 Switch", AD1836_ADC_CTRL2, AD1836_ADCL2_MUTE,
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AD1836_ADCR2_MUTE, 1, 1),
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/* DAC switch control */
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SOC_DOUBLE("DAC1 Switch", AD1836_DAC_CTRL2, AD1836_DACL1_MUTE,
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AD1836_DACR1_MUTE, 1, 1),
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SOC_DOUBLE("DAC2 Switch", AD1836_DAC_CTRL2, AD1836_DACL2_MUTE,
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AD1836_DACR2_MUTE, 1, 1),
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SOC_DOUBLE("DAC3 Switch", AD1836_DAC_CTRL2, AD1836_DACL3_MUTE,
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AD1836_DACR3_MUTE, 1, 1),
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/* ADC high-pass filter */
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SOC_SINGLE("ADC High Pass Filter Switch", AD1836_ADC_CTRL1,
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AD1836_ADC_HIGHPASS_FILTER, 1, 0),
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SOC_ENUM("Playback Deemphasis", ad1836_deemp_enum),
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static const struct snd_soc_dapm_widget ad1836_dapm_widgets[] = {
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SND_SOC_DAPM_DAC("DAC", "Playback", AD1836_DAC_CTRL1,
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AD1836_DAC_POWERDOWN, 1),
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SND_SOC_DAPM_ADC("ADC", "Capture", SND_SOC_NOPM, 0, 0),
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SND_SOC_DAPM_SUPPLY("ADC_PWR", AD1836_ADC_CTRL1,
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AD1836_ADC_POWERDOWN, 1, NULL, 0),
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SND_SOC_DAPM_OUTPUT("DAC1OUT"),
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SND_SOC_DAPM_OUTPUT("DAC2OUT"),
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SND_SOC_DAPM_OUTPUT("DAC3OUT"),
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SND_SOC_DAPM_INPUT("ADC1IN"),
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SND_SOC_DAPM_INPUT("ADC2IN"),
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static const struct snd_soc_dapm_route audio_paths[] = {
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{ "DAC", NULL, "ADC_PWR" },
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{ "ADC", NULL, "ADC_PWR" },
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{ "DAC1OUT", "DAC1 Switch", "DAC" },
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{ "DAC2OUT", "DAC2 Switch", "DAC" },
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{ "DAC3OUT", "DAC3 Switch", "DAC" },
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{ "ADC", "ADC1 Switch", "ADC1IN" },
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{ "ADC", "ADC2 Switch", "ADC2IN" },
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static int ad1836_set_dai_fmt(struct snd_soc_dai *codec_dai,
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switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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/* at present, we support adc aux mode to interface with
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* blackfin sport tdm mode
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case SND_SOC_DAIFMT_DSP_A:
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switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
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case SND_SOC_DAIFMT_IB_IF:
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switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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/* ALCLK,ABCLK are both output, AD1836 can only be master */
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case SND_SOC_DAIFMT_CBM_CFM:
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static int ad1836_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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struct snd_soc_pcm_runtime *rtd = substream->private_data;
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struct snd_soc_device *socdev = rtd->socdev;
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struct snd_soc_codec *codec = socdev->card->codec;
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switch (params_format(params)) {
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S32_LE:
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snd_soc_update_bits(codec, AD1836_DAC_CTRL1,
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AD1836_DAC_WORD_LEN_MASK, word_len);
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snd_soc_update_bits(codec, AD1836_ADC_CTRL2,
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AD1836_ADC_WORD_LEN_MASK, word_len);
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* interface to read/write ad1836 register
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#define AD1836_SPI_REG_SHFT 12
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#define AD1836_SPI_READ (1 << 11)
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#define AD1836_SPI_VAL_MSK 0x3FF
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* write to the ad1836 register space
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static int ad1836_write_reg(struct snd_soc_codec *codec, unsigned int reg,
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u16 *reg_cache = codec->reg_cache;
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if (value != reg_cache[reg]) {
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struct spi_transfer t = {
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struct spi_message m;
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buf = (reg << AD1836_SPI_REG_SHFT) |
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(value & AD1836_SPI_VAL_MSK);
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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ret = spi_sync(codec->control_data, &m);
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reg_cache[reg] = value;
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* read from the ad1836 register space cache
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static unsigned int ad1836_read_reg_cache(struct snd_soc_codec *codec,
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u16 *reg_cache = codec->reg_cache;
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if (reg >= codec->reg_cache_size)
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return reg_cache[reg];
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static int __devinit ad1836_spi_probe(struct spi_device *spi)
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struct snd_soc_codec *codec;
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struct ad1836_priv *ad1836;
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ad1836 = kzalloc(sizeof(struct ad1836_priv), GFP_KERNEL);
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codec = &ad1836->codec;
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codec->control_data = spi;
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codec->dev = &spi->dev;
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dev_set_drvdata(&spi->dev, ad1836);
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return ad1836_register(ad1836);
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static int __devexit ad1836_spi_remove(struct spi_device *spi)
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struct ad1836_priv *ad1836 = dev_get_drvdata(&spi->dev);
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ad1836_unregister(ad1836);
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static struct spi_driver ad1836_spi_driver = {
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.name = "ad1836-spi",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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.probe = ad1836_spi_probe,
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.remove = __devexit_p(ad1836_spi_remove),
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static struct snd_soc_dai_ops ad1836_dai_ops = {
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.hw_params = ad1836_hw_params,
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.set_fmt = ad1836_set_dai_fmt,
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/* codec DAI instance */
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struct snd_soc_dai ad1836_dai = {
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.stream_name = "Playback",
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.rates = SNDRV_PCM_RATE_48000,
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.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
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.stream_name = "Capture",
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.rates = SNDRV_PCM_RATE_48000,
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.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_S24_LE,
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.ops = &ad1836_dai_ops,
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EXPORT_SYMBOL_GPL(ad1836_dai);
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static int ad1836_register(struct ad1836_priv *ad1836)
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struct snd_soc_codec *codec = &ad1836->codec;
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dev_err(codec->dev, "Another ad1836 is registered\n");
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mutex_init(&codec->mutex);
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INIT_LIST_HEAD(&codec->dapm_widgets);
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INIT_LIST_HEAD(&codec->dapm_paths);
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codec->private_data = ad1836;
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codec->reg_cache = ad1836->reg_cache;
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codec->reg_cache_size = AD1836_NUM_REGS;
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codec->name = "AD1836";
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codec->owner = THIS_MODULE;
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codec->dai = &ad1836_dai;
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codec->write = ad1836_write_reg;
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codec->read = ad1836_read_reg_cache;
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INIT_LIST_HEAD(&codec->dapm_widgets);
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INIT_LIST_HEAD(&codec->dapm_paths);
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ad1836_dai.dev = codec->dev;
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ad1836_codec = codec;
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/* default setting for ad1836 */
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/* de-emphasis: 48kHz, power-on dac */
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codec->write(codec, AD1836_DAC_CTRL1, 0x300);
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/* unmute dac channels */
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codec->write(codec, AD1836_DAC_CTRL2, 0x0);
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/* high-pass filter enable, power-on adc */
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codec->write(codec, AD1836_ADC_CTRL1, 0x100);
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/* unmute adc channles, adc aux mode */
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codec->write(codec, AD1836_ADC_CTRL2, 0x180);
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/* left/right diff:PGA/MUX */
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codec->write(codec, AD1836_ADC_CTRL3, 0x3A);
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codec->write(codec, AD1836_DAC_L1_VOL, 0x3FF);
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codec->write(codec, AD1836_DAC_R1_VOL, 0x3FF);
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codec->write(codec, AD1836_DAC_L2_VOL, 0x3FF);
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codec->write(codec, AD1836_DAC_R2_VOL, 0x3FF);
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codec->write(codec, AD1836_DAC_L3_VOL, 0x3FF);
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codec->write(codec, AD1836_DAC_R3_VOL, 0x3FF);
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ret = snd_soc_register_codec(codec);
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dev_err(codec->dev, "Failed to register codec: %d\n", ret);
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ret = snd_soc_register_dai(&ad1836_dai);
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dev_err(codec->dev, "Failed to register DAI: %d\n", ret);
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snd_soc_unregister_codec(codec);
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static void ad1836_unregister(struct ad1836_priv *ad1836)
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snd_soc_unregister_dai(&ad1836_dai);
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snd_soc_unregister_codec(&ad1836->codec);
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static int ad1836_probe(struct platform_device *pdev)
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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struct snd_soc_codec *codec;
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if (ad1836_codec == NULL) {
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dev_err(&pdev->dev, "Codec device not registered\n");
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socdev->card->codec = ad1836_codec;
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codec = ad1836_codec;
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ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
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dev_err(codec->dev, "failed to create pcms: %d\n", ret);
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snd_soc_add_controls(codec, ad1836_snd_controls,
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ARRAY_SIZE(ad1836_snd_controls));
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snd_soc_dapm_new_controls(codec, ad1836_dapm_widgets,
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ARRAY_SIZE(ad1836_dapm_widgets));
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snd_soc_dapm_add_routes(codec, audio_paths, ARRAY_SIZE(audio_paths));
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snd_soc_dapm_new_widgets(codec);
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ret = snd_soc_init_card(socdev);
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dev_err(codec->dev, "failed to register card: %d\n", ret);
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snd_soc_free_pcms(socdev);
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snd_soc_dapm_free(socdev);
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/* power down chip */
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static int ad1836_remove(struct platform_device *pdev)
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struct snd_soc_device *socdev = platform_get_drvdata(pdev);
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snd_soc_free_pcms(socdev);
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snd_soc_dapm_free(socdev);
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struct snd_soc_codec_device soc_codec_dev_ad1836 = {
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.probe = ad1836_probe,
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.remove = ad1836_remove,
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EXPORT_SYMBOL_GPL(soc_codec_dev_ad1836);
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static int __init ad1836_init(void)
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ret = spi_register_driver(&ad1836_spi_driver);
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printk(KERN_ERR "Failed to register ad1836 SPI driver: %d\n",
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module_init(ad1836_init);
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static void __exit ad1836_exit(void)
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spi_unregister_driver(&ad1836_spi_driver);
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module_exit(ad1836_exit);
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MODULE_DESCRIPTION("ASoC ad1836 driver");
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_LICENSE("GPL");