365 lines
8.7 KiB
C
365 lines
8.7 KiB
C
/*
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* AK4104 ALSA SoC (ASoC) driver
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*
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* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/regulator/consumer.h>
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#include <sound/asoundef.h>
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#include <sound/core.h>
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#include <sound/soc.h>
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#include <sound/initval.h>
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/* AK4104 registers addresses */
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#define AK4104_REG_CONTROL1 0x00
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#define AK4104_REG_RESERVED 0x01
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#define AK4104_REG_CONTROL2 0x02
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#define AK4104_REG_TX 0x03
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#define AK4104_REG_CHN_STATUS(x) ((x) + 0x04)
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#define AK4104_NUM_REGS 10
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#define AK4104_REG_MASK 0x1f
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#define AK4104_READ 0xc0
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#define AK4104_WRITE 0xe0
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#define AK4104_RESERVED_VAL 0x5b
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/* Bit masks for AK4104 registers */
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#define AK4104_CONTROL1_RSTN (1 << 0)
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#define AK4104_CONTROL1_PW (1 << 1)
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#define AK4104_CONTROL1_DIF0 (1 << 2)
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#define AK4104_CONTROL1_DIF1 (1 << 3)
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#define AK4104_CONTROL2_SEL0 (1 << 0)
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#define AK4104_CONTROL2_SEL1 (1 << 1)
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#define AK4104_CONTROL2_MODE (1 << 2)
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#define AK4104_TX_TXE (1 << 0)
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#define AK4104_TX_V (1 << 1)
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struct ak4104_private {
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struct regmap *regmap;
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struct regulator *regulator;
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};
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static const struct snd_soc_dapm_widget ak4104_dapm_widgets[] = {
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SND_SOC_DAPM_PGA("TXE", AK4104_REG_TX, AK4104_TX_TXE, 0, NULL, 0),
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SND_SOC_DAPM_OUTPUT("TX"),
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};
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static const struct snd_soc_dapm_route ak4104_dapm_routes[] = {
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{ "TXE", NULL, "Playback" },
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{ "TX", NULL, "TXE" },
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};
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static int ak4104_set_dai_fmt(struct snd_soc_dai *codec_dai,
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unsigned int format)
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{
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struct snd_soc_codec *codec = codec_dai->codec;
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struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
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int val = 0;
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int ret;
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/* set DAI format */
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switch (format & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_RIGHT_J:
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break;
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case SND_SOC_DAIFMT_LEFT_J:
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val |= AK4104_CONTROL1_DIF0;
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break;
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case SND_SOC_DAIFMT_I2S:
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val |= AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1;
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break;
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default:
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dev_err(codec->dev, "invalid dai format\n");
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return -EINVAL;
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}
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/* This device can only be slave */
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if ((format & SND_SOC_DAIFMT_MASTER_MASK) != SND_SOC_DAIFMT_CBS_CFS)
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return -EINVAL;
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ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
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AK4104_CONTROL1_DIF0 | AK4104_CONTROL1_DIF1,
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val);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int ak4104_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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{
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struct snd_soc_codec *codec = dai->codec;
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struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
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int ret, val = 0;
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/* set the IEC958 bits: consumer mode, no copyright bit */
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val |= IEC958_AES0_CON_NOT_COPYRIGHT;
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regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(0), val);
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val = 0;
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switch (params_rate(params)) {
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case 22050:
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val |= IEC958_AES3_CON_FS_22050;
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break;
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case 24000:
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val |= IEC958_AES3_CON_FS_24000;
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break;
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case 32000:
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val |= IEC958_AES3_CON_FS_32000;
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break;
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case 44100:
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val |= IEC958_AES3_CON_FS_44100;
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break;
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case 48000:
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val |= IEC958_AES3_CON_FS_48000;
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break;
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case 88200:
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val |= IEC958_AES3_CON_FS_88200;
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break;
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case 96000:
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val |= IEC958_AES3_CON_FS_96000;
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break;
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case 176400:
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val |= IEC958_AES3_CON_FS_176400;
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break;
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case 192000:
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val |= IEC958_AES3_CON_FS_192000;
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break;
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default:
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dev_err(codec->dev, "unsupported sampling rate\n");
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return -EINVAL;
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}
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ret = regmap_write(ak4104->regmap, AK4104_REG_CHN_STATUS(3), val);
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if (ret < 0)
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return ret;
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return 0;
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}
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static const struct snd_soc_dai_ops ak4101_dai_ops = {
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.hw_params = ak4104_hw_params,
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.set_fmt = ak4104_set_dai_fmt,
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};
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static struct snd_soc_dai_driver ak4104_dai = {
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.name = "ak4104-hifi",
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.playback = {
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.stream_name = "Playback",
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.channels_min = 2,
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.channels_max = 2,
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.rates = SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
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SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
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SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
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SNDRV_PCM_RATE_176400 | SNDRV_PCM_RATE_192000,
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.formats = SNDRV_PCM_FMTBIT_S16_LE |
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SNDRV_PCM_FMTBIT_S24_3LE |
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SNDRV_PCM_FMTBIT_S24_LE
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},
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.ops = &ak4101_dai_ops,
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};
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static int ak4104_probe(struct snd_soc_codec *codec)
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{
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struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
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int ret;
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ret = regulator_enable(ak4104->regulator);
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if (ret < 0) {
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dev_err(codec->dev, "Unable to enable regulator: %d\n", ret);
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return ret;
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}
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/* set power-up and non-reset bits */
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ret = regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
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AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN,
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AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN);
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if (ret < 0)
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goto exit_disable_regulator;
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/* enable transmitter */
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ret = regmap_update_bits(ak4104->regmap, AK4104_REG_TX,
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AK4104_TX_TXE, AK4104_TX_TXE);
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if (ret < 0)
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goto exit_disable_regulator;
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return 0;
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exit_disable_regulator:
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regulator_disable(ak4104->regulator);
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return ret;
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}
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static int ak4104_remove(struct snd_soc_codec *codec)
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{
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struct ak4104_private *ak4104 = snd_soc_codec_get_drvdata(codec);
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regmap_update_bits(ak4104->regmap, AK4104_REG_CONTROL1,
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AK4104_CONTROL1_PW | AK4104_CONTROL1_RSTN, 0);
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regulator_disable(ak4104->regulator);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ak4104_soc_suspend(struct snd_soc_codec *codec)
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{
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struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec);
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regulator_disable(priv->regulator);
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return 0;
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}
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static int ak4104_soc_resume(struct snd_soc_codec *codec)
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{
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struct ak4104_private *priv = snd_soc_codec_get_drvdata(codec);
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int ret;
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ret = regulator_enable(priv->regulator);
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if (ret < 0)
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return ret;
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return 0;
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}
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#else
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#define ak4104_soc_suspend NULL
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#define ak4104_soc_resume NULL
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#endif /* CONFIG_PM */
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static const struct snd_soc_codec_driver soc_codec_device_ak4104 = {
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.probe = ak4104_probe,
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.remove = ak4104_remove,
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.suspend = ak4104_soc_suspend,
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.resume = ak4104_soc_resume,
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.component_driver = {
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.dapm_widgets = ak4104_dapm_widgets,
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.num_dapm_widgets = ARRAY_SIZE(ak4104_dapm_widgets),
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.dapm_routes = ak4104_dapm_routes,
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.num_dapm_routes = ARRAY_SIZE(ak4104_dapm_routes),
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}
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};
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static const struct regmap_config ak4104_regmap = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = AK4104_NUM_REGS - 1,
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.read_flag_mask = AK4104_READ,
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.write_flag_mask = AK4104_WRITE,
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.cache_type = REGCACHE_RBTREE,
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};
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static int ak4104_spi_probe(struct spi_device *spi)
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{
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struct device_node *np = spi->dev.of_node;
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struct ak4104_private *ak4104;
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unsigned int val;
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int ret;
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spi->bits_per_word = 8;
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spi->mode = SPI_MODE_0;
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ret = spi_setup(spi);
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if (ret < 0)
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return ret;
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ak4104 = devm_kzalloc(&spi->dev, sizeof(struct ak4104_private),
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GFP_KERNEL);
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if (ak4104 == NULL)
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return -ENOMEM;
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ak4104->regulator = devm_regulator_get(&spi->dev, "vdd");
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if (IS_ERR(ak4104->regulator)) {
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ret = PTR_ERR(ak4104->regulator);
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dev_err(&spi->dev, "Unable to get Vdd regulator: %d\n", ret);
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return ret;
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}
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ak4104->regmap = devm_regmap_init_spi(spi, &ak4104_regmap);
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if (IS_ERR(ak4104->regmap)) {
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ret = PTR_ERR(ak4104->regmap);
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return ret;
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}
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if (np) {
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enum of_gpio_flags flags;
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int gpio = of_get_named_gpio_flags(np, "reset-gpio", 0, &flags);
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if (gpio_is_valid(gpio)) {
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ret = devm_gpio_request_one(&spi->dev, gpio,
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flags & OF_GPIO_ACTIVE_LOW ?
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GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
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"ak4104 reset");
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if (ret < 0)
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return ret;
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}
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}
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/* read the 'reserved' register - according to the datasheet, it
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* should contain 0x5b. Not a good way to verify the presence of
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* the device, but there is no hardware ID register. */
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ret = regmap_read(ak4104->regmap, AK4104_REG_RESERVED, &val);
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if (ret != 0)
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return ret;
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if (val != AK4104_RESERVED_VAL)
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return -ENODEV;
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spi_set_drvdata(spi, ak4104);
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ret = snd_soc_register_codec(&spi->dev,
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&soc_codec_device_ak4104, &ak4104_dai, 1);
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return ret;
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}
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static int ak4104_spi_remove(struct spi_device *spi)
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{
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snd_soc_unregister_codec(&spi->dev);
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return 0;
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}
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static const struct of_device_id ak4104_of_match[] = {
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{ .compatible = "asahi-kasei,ak4104", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ak4104_of_match);
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static const struct spi_device_id ak4104_id_table[] = {
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{ "ak4104", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, ak4104_id_table);
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static struct spi_driver ak4104_spi_driver = {
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.driver = {
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.name = "ak4104",
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.of_match_table = ak4104_of_match,
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},
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.id_table = ak4104_id_table,
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.probe = ak4104_spi_probe,
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.remove = ak4104_spi_remove,
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};
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module_spi_driver(ak4104_spi_driver);
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MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
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MODULE_DESCRIPTION("Asahi Kasei AK4104 ALSA SoC driver");
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MODULE_LICENSE("GPL");
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