ASoC: Asahi Kasei AK4641 codec driver (00d27010) · Commits · e / devices / android_kernel_fairphone_FP4

include/sound/ak4641.h

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		/*
		* AK4641 ALSA SoC Codec driver
		*
		* Copyright 2009 Philipp Zabel
		*
		* 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.
		*/

		#ifndef __AK4641_H
		#define __AK4641_H

		/**
		* struct ak4641_platform_data - platform specific AK4641 configuration
		* @gpio_power: GPIO to control external power to AK4641
		* @gpio_npdn: GPIO connected to AK4641 nPDN pin
		*
		* Both GPIO parameters are optional.
		*/
		struct ak4641_platform_data {
		int gpio_power;
		int gpio_npdn;
		};

		#endif /* __AK4641_H */

sound/soc/codecs/Kconfig

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		@@ -20,6 +20,7 @@ config SND_SOC_ALL_CODECS
		select SND_SOC_ADS117X
		select SND_SOC_AK4104 if SPI_MASTER
		select SND_SOC_AK4535 if I2C
		select SND_SOC_AK4641 if I2C
		select SND_SOC_AK4642 if I2C
		select SND_SOC_AK4671 if I2C
		select SND_SOC_ALC5623 if I2C
		@@ -139,6 +140,9 @@ config SND_SOC_AK4104
		config SND_SOC_AK4535
		tristate

		config SND_SOC_AK4641
		tristate

		config SND_SOC_AK4642
		tristate

sound/soc/codecs/Makefile

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		@@ -7,6 +7,7 @@ snd-soc-ad73311-objs := ad73311.o
		snd-soc-ads117x-objs := ads117x.o
		snd-soc-ak4104-objs := ak4104.o
		snd-soc-ak4535-objs := ak4535.o
		snd-soc-ak4641-objs := ak4641.o
		snd-soc-ak4642-objs := ak4642.o
		snd-soc-ak4671-objs := ak4671.o
		snd-soc-cq93vc-objs := cq93vc.o
		@@ -97,6 +98,7 @@ obj-$(CONFIG_SND_SOC_AD73311) += snd-soc-ad73311.o
		obj-$(CONFIG_SND_SOC_ADS117X) += snd-soc-ads117x.o
		obj-$(CONFIG_SND_SOC_AK4104) += snd-soc-ak4104.o
		obj-$(CONFIG_SND_SOC_AK4535) += snd-soc-ak4535.o
		obj-$(CONFIG_SND_SOC_AK4641) += snd-soc-ak4641.o
		obj-$(CONFIG_SND_SOC_AK4642) += snd-soc-ak4642.o
		obj-$(CONFIG_SND_SOC_AK4671) += snd-soc-ak4671.o
		obj-$(CONFIG_SND_SOC_ALC5623) += snd-soc-alc5623.o

sound/soc/codecs/ak4641.c

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		/*
		* ak4641.c -- AK4641 ALSA Soc Audio driver
		*
		* Copyright (C) 2008 Harald Welte <laforge@gnufiish.org>
		* Copyright (C) 2011 Dmitry Artamonow <mad_soft@inbox.ru>
		*
		* Based on ak4535.c by Richard Purdie
		*
		* 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.
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/delay.h>
		#include <linux/gpio.h>
		#include <linux/pm.h>
		#include <linux/i2c.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <sound/core.h>
		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		#include <sound/soc.h>
		#include <sound/initval.h>
		#include <sound/tlv.h>
		#include <sound/ak4641.h>

		#include "ak4641.h"

		/* codec private data */
		struct ak4641_priv {
		struct snd_soc_codec *codec;
		unsigned int sysclk;
		int deemph;
		int playback_fs;
		};

		/*
		* ak4641 register cache
		*/
		static const u8 ak4641_reg[AK4641_CACHEREGNUM] = {
		0x00, 0x80, 0x00, 0x80,
		0x02, 0x00, 0x11, 0x05,
		0x00, 0x00, 0x36, 0x10,
		0x00, 0x00, 0x57, 0x00,
		0x88, 0x88, 0x08, 0x08
		};

		static const int deemph_settings[] = {44100, 0, 48000, 32000};

		static int ak4641_set_deemph(struct snd_soc_codec *codec)
		{
		struct ak4641_priv *ak4641 = snd_soc_codec_get_drvdata(codec);
		int i, best = 0;

		for (i = 0 ; i < ARRAY_SIZE(deemph_settings); i++) {
		/* if deemphasis is on, select the nearest available rate */
		if (ak4641->deemph && deemph_settings[i] != 0 &&
		abs(deemph_settings[i] - ak4641->playback_fs) <
		abs(deemph_settings[best] - ak4641->playback_fs))
		best = i;

		if (!ak4641->deemph && deemph_settings[i] == 0)
		best = i;
		}

		dev_dbg(codec->dev, "Set deemphasis %d\n", best);

		return snd_soc_update_bits(codec, AK4641_DAC, 0x3, best);
		}

		static int ak4641_put_deemph(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
		struct ak4641_priv *ak4641 = snd_soc_codec_get_drvdata(codec);
		int deemph = ucontrol->value.enumerated.item[0];

		if (deemph > 1)
		return -EINVAL;

		ak4641->deemph = deemph;

		return ak4641_set_deemph(codec);
		}

		static int ak4641_get_deemph(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
		struct ak4641_priv *ak4641 = snd_soc_codec_get_drvdata(codec);

		ucontrol->value.enumerated.item[0] = ak4641->deemph;
		return 0;
		};

		static const char *ak4641_mono_out[] = {"(L + R)/2", "Hi-Z"};
		static const char *ak4641_hp_out[] = {"Stereo", "Mono"};
		static const char *ak4641_mic_select[] = {"Internal", "External"};
		static const char *ak4641_mic_or_dac[] = {"Microphone", "Voice DAC"};


		static const DECLARE_TLV_DB_SCALE(mono_gain_tlv, -1700, 2300, 0);
		static const DECLARE_TLV_DB_SCALE(mic_boost_tlv, 0, 2000, 0);
		static const DECLARE_TLV_DB_SCALE(eq_tlv, -1050, 150, 0);
		static const DECLARE_TLV_DB_SCALE(master_tlv, -12750, 50, 0);
		static const DECLARE_TLV_DB_SCALE(mic_stereo_sidetone_tlv, -2700, 300, 0);
		static const DECLARE_TLV_DB_SCALE(mic_mono_sidetone_tlv, -400, 400, 0);
		static const DECLARE_TLV_DB_SCALE(capture_tlv, -800, 50, 0);
		static const DECLARE_TLV_DB_SCALE(alc_tlv, -800, 50, 0);
		static const DECLARE_TLV_DB_SCALE(aux_in_tlv, -2100, 300, 0);


		static const struct soc_enum ak4641_mono_out_enum =
		SOC_ENUM_SINGLE(AK4641_SIG1, 6, 2, ak4641_mono_out);
		static const struct soc_enum ak4641_hp_out_enum =
		SOC_ENUM_SINGLE(AK4641_MODE2, 2, 2, ak4641_hp_out);
		static const struct soc_enum ak4641_mic_select_enum =
		SOC_ENUM_SINGLE(AK4641_MIC, 1, 2, ak4641_mic_select);
		static const struct soc_enum ak4641_mic_or_dac_enum =
		SOC_ENUM_SINGLE(AK4641_BTIF, 4, 2, ak4641_mic_or_dac);

		static const struct snd_kcontrol_new ak4641_snd_controls[] = {
		SOC_ENUM("Mono 1 Output", ak4641_mono_out_enum),
		SOC_SINGLE_TLV("Mono 1 Gain Volume", AK4641_SIG1, 7, 1, 1,
		mono_gain_tlv),
		SOC_ENUM("Headphone Output", ak4641_hp_out_enum),
		SOC_SINGLE_BOOL_EXT("Playback Deemphasis Switch", 0,
		ak4641_get_deemph, ak4641_put_deemph),

		SOC_SINGLE_TLV("Mic Boost Volume", AK4641_MIC, 0, 1, 0, mic_boost_tlv),

		SOC_SINGLE("ALC Operation Time", AK4641_TIMER, 0, 3, 0),
		SOC_SINGLE("ALC Recovery Time", AK4641_TIMER, 2, 3, 0),
		SOC_SINGLE("ALC ZC Time", AK4641_TIMER, 4, 3, 0),

		SOC_SINGLE("ALC 1 Switch", AK4641_ALC1, 5, 1, 0),

		SOC_SINGLE_TLV("ALC Volume", AK4641_ALC2, 0, 71, 0, alc_tlv),
		SOC_SINGLE("Left Out Enable Switch", AK4641_SIG2, 1, 1, 0),
		SOC_SINGLE("Right Out Enable Switch", AK4641_SIG2, 0, 1, 0),

		SOC_SINGLE_TLV("Capture Volume", AK4641_PGA, 0, 71, 0, capture_tlv),

		SOC_DOUBLE_R_TLV("Master Playback Volume", AK4641_LATT,
		AK4641_RATT, 0, 255, 1, master_tlv),

		SOC_SINGLE_TLV("AUX In Volume", AK4641_VOL, 0, 15, 0, aux_in_tlv),

		SOC_SINGLE("Equalizer Switch", AK4641_DAC, 2, 1, 0),
		SOC_SINGLE_TLV("EQ1 100 Hz Volume", AK4641_EQLO, 0, 15, 1, eq_tlv),
		SOC_SINGLE_TLV("EQ2 250 Hz Volume", AK4641_EQLO, 4, 15, 1, eq_tlv),
		SOC_SINGLE_TLV("EQ3 1 kHz Volume", AK4641_EQMID, 0, 15, 1, eq_tlv),
		SOC_SINGLE_TLV("EQ4 3.5 kHz Volume", AK4641_EQMID, 4, 15, 1, eq_tlv),
		SOC_SINGLE_TLV("EQ5 10 kHz Volume", AK4641_EQHI, 0, 15, 1, eq_tlv),
		};

		/* Mono 1 Mixer */
		static const struct snd_kcontrol_new ak4641_mono1_mixer_controls[] = {
		SOC_DAPM_SINGLE_TLV("Mic Mono Sidetone Volume", AK4641_VOL, 7, 1, 0,
		mic_mono_sidetone_tlv),
		SOC_DAPM_SINGLE("Mic Mono Sidetone Switch", AK4641_SIG1, 4, 1, 0),
		SOC_DAPM_SINGLE("Mono Playback Switch", AK4641_SIG1, 5, 1, 0),
		};

		/* Stereo Mixer */
		static const struct snd_kcontrol_new ak4641_stereo_mixer_controls[] = {
		SOC_DAPM_SINGLE_TLV("Mic Sidetone Volume", AK4641_VOL, 4, 7, 0,
		mic_stereo_sidetone_tlv),
		SOC_DAPM_SINGLE("Mic Sidetone Switch", AK4641_SIG2, 4, 1, 0),
		SOC_DAPM_SINGLE("Playback Switch", AK4641_SIG2, 7, 1, 0),
		SOC_DAPM_SINGLE("Aux Bypass Switch", AK4641_SIG2, 5, 1, 0),
		};

		/* Input Mixer */
		static const struct snd_kcontrol_new ak4641_input_mixer_controls[] = {
		SOC_DAPM_SINGLE("Mic Capture Switch", AK4641_MIC, 2, 1, 0),
		SOC_DAPM_SINGLE("Aux Capture Switch", AK4641_MIC, 5, 1, 0),
		};

		/* Mic mux */
		static const struct snd_kcontrol_new ak4641_mic_mux_control =
		SOC_DAPM_ENUM("Mic Select", ak4641_mic_select_enum);

		/* Input mux */
		static const struct snd_kcontrol_new ak4641_input_mux_control =
		SOC_DAPM_ENUM("Input Select", ak4641_mic_or_dac_enum);

		/* mono 2 switch */
		static const struct snd_kcontrol_new ak4641_mono2_control =
		SOC_DAPM_SINGLE("Switch", AK4641_SIG1, 0, 1, 0);

		/* ak4641 dapm widgets */
		static const struct snd_soc_dapm_widget ak4641_dapm_widgets[] = {
		SND_SOC_DAPM_MIXER("Stereo Mixer", SND_SOC_NOPM, 0, 0,
		&ak4641_stereo_mixer_controls[0],
		ARRAY_SIZE(ak4641_stereo_mixer_controls)),
		SND_SOC_DAPM_MIXER("Mono1 Mixer", SND_SOC_NOPM, 0, 0,
		&ak4641_mono1_mixer_controls[0],
		ARRAY_SIZE(ak4641_mono1_mixer_controls)),
		SND_SOC_DAPM_MIXER("Input Mixer", SND_SOC_NOPM, 0, 0,
		&ak4641_input_mixer_controls[0],
		ARRAY_SIZE(ak4641_input_mixer_controls)),
		SND_SOC_DAPM_MUX("Mic Mux", SND_SOC_NOPM, 0, 0,
		&ak4641_mic_mux_control),
		SND_SOC_DAPM_MUX("Input Mux", SND_SOC_NOPM, 0, 0,
		&ak4641_input_mux_control),
		SND_SOC_DAPM_SWITCH("Mono 2 Enable", SND_SOC_NOPM, 0, 0,
		&ak4641_mono2_control),

		SND_SOC_DAPM_OUTPUT("LOUT"),
		SND_SOC_DAPM_OUTPUT("ROUT"),
		SND_SOC_DAPM_OUTPUT("MOUT1"),
		SND_SOC_DAPM_OUTPUT("MOUT2"),
		SND_SOC_DAPM_OUTPUT("MICOUT"),

		SND_SOC_DAPM_ADC("ADC", "HiFi Capture", AK4641_PM1, 0, 0),
		SND_SOC_DAPM_PGA("Mic", AK4641_PM1, 1, 0, NULL, 0),
		SND_SOC_DAPM_PGA("AUX In", AK4641_PM1, 2, 0, NULL, 0),
		SND_SOC_DAPM_PGA("Mono Out", AK4641_PM1, 3, 0, NULL, 0),
		SND_SOC_DAPM_PGA("Line Out", AK4641_PM1, 4, 0, NULL, 0),

		SND_SOC_DAPM_DAC("DAC", "HiFi Playback", AK4641_PM2, 0, 0),
		SND_SOC_DAPM_PGA("Mono Out 2", AK4641_PM2, 3, 0, NULL, 0),

		SND_SOC_DAPM_ADC("Voice ADC", "Voice Capture", AK4641_BTIF, 0, 0),
		SND_SOC_DAPM_ADC("Voice DAC", "Voice Playback", AK4641_BTIF, 1, 0),

		SND_SOC_DAPM_MICBIAS("Mic Int Bias", AK4641_MIC, 3, 0),
		SND_SOC_DAPM_MICBIAS("Mic Ext Bias", AK4641_MIC, 4, 0),

		SND_SOC_DAPM_INPUT("MICIN"),
		SND_SOC_DAPM_INPUT("MICEXT"),
		SND_SOC_DAPM_INPUT("AUX"),
		SND_SOC_DAPM_INPUT("AIN"),
		};

		static const struct snd_soc_dapm_route ak4641_audio_map[] = {
		/* Stereo Mixer */
		{"Stereo Mixer", "Playback Switch", "DAC"},
		{"Stereo Mixer", "Mic Sidetone Switch", "Input Mux"},
		{"Stereo Mixer", "Aux Bypass Switch", "AUX In"},

		/* Mono 1 Mixer */
		{"Mono1 Mixer", "Mic Mono Sidetone Switch", "Input Mux"},
		{"Mono1 Mixer", "Mono Playback Switch", "DAC"},

		/* Mic */
		{"Mic", NULL, "AIN"},
		{"Mic Mux", "Internal", "Mic Int Bias"},
		{"Mic Mux", "External", "Mic Ext Bias"},
		{"Mic Int Bias", NULL, "MICIN"},
		{"Mic Ext Bias", NULL, "MICEXT"},
		{"MICOUT", NULL, "Mic Mux"},

		/* Input Mux */
		{"Input Mux", "Microphone", "Mic"},
		{"Input Mux", "Voice DAC", "Voice DAC"},

		/* Line Out */
		{"LOUT", NULL, "Line Out"},
		{"ROUT", NULL, "Line Out"},
		{"Line Out", NULL, "Stereo Mixer"},

		/* Mono 1 Out */
		{"MOUT1", NULL, "Mono Out"},
		{"Mono Out", NULL, "Mono1 Mixer"},

		/* Mono 2 Out */
		{"MOUT2", NULL, "Mono 2 Enable"},
		{"Mono 2 Enable", "Switch", "Mono Out 2"},
		{"Mono Out 2", NULL, "Stereo Mixer"},

		{"Voice ADC", NULL, "Mono 2 Enable"},

		/* Aux In */
		{"AUX In", NULL, "AUX"},

		/* ADC */
		{"ADC", NULL, "Input Mixer"},
		{"Input Mixer", "Mic Capture Switch", "Mic"},
		{"Input Mixer", "Aux Capture Switch", "AUX In"},
		};

		static int ak4641_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 ak4641_priv *ak4641 = snd_soc_codec_get_drvdata(codec);

		ak4641->sysclk = freq;
		return 0;
		}

		static int ak4641_i2s_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_codec *codec = rtd->codec;
		struct ak4641_priv *ak4641 = snd_soc_codec_get_drvdata(codec);
		int rate = params_rate(params), fs = 256;
		u8 mode2;

		if (rate)
		fs = ak4641->sysclk / rate;
		else
		return -EINVAL;

		/* set fs */
		switch (fs) {
		case 1024:
		mode2 = (0x2 << 5);
		break;
		case 512:
		mode2 = (0x1 << 5);
		break;
		case 256:
		mode2 = (0x0 << 5);
		break;
		default:
		dev_err(codec->dev, "Error: unsupported fs=%d\n", fs);
		return -EINVAL;
		}

		snd_soc_update_bits(codec, AK4641_MODE2, (0x3 << 5), mode2);

		/* Update de-emphasis filter for the new rate */
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		ak4641->playback_fs = rate;
		ak4641_set_deemph(codec);
		};

		return 0;
		}

		static int ak4641_pcm_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
		{
		struct snd_soc_codec *codec = codec_dai->codec;
		u8 btif;

		/* interface format */
		switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
		case SND_SOC_DAIFMT_I2S:
		btif = (0x3 << 5);
		break;
		case SND_SOC_DAIFMT_LEFT_J:
		btif = (0x2 << 5);
		break;
		case SND_SOC_DAIFMT_DSP_A: /* MSB after FRM */
		btif = (0x0 << 5);
		break;
		case SND_SOC_DAIFMT_DSP_B: /* MSB during FRM */
		btif = (0x1 << 5);
		break;
		default:
		return -EINVAL;
		}

		return snd_soc_update_bits(codec, AK4641_BTIF, (0x3 << 5), btif);
		}

		static int ak4641_i2s_set_dai_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
		{
		struct snd_soc_codec *codec = codec_dai->codec;
		u8 mode1 = 0;

		/* interface format */
		switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
		case SND_SOC_DAIFMT_I2S:
		mode1 = 0x02;
		break;
		case SND_SOC_DAIFMT_LEFT_J:
		mode1 = 0x01;
		break;
		default:
		return -EINVAL;
		}

		return snd_soc_write(codec, AK4641_MODE1, mode1);
		}

		static int ak4641_mute(struct snd_soc_dai *dai, int mute)
		{
		struct snd_soc_codec *codec = dai->codec;

		return snd_soc_update_bits(codec, AK4641_DAC, 0x20, mute ? 0x20 : 0);
		}

		static int ak4641_set_bias_level(struct snd_soc_codec *codec,
		enum snd_soc_bias_level level)
		{
		struct ak4641_platform_data *pdata = codec->dev->platform_data;
		int ret;

		switch (level) {
		case SND_SOC_BIAS_ON:
		/* unmute */
		snd_soc_update_bits(codec, AK4641_DAC, 0x20, 0);
		break;
		case SND_SOC_BIAS_PREPARE:
		/* mute */
		snd_soc_update_bits(codec, AK4641_DAC, 0x20, 0x20);
		break;
		case SND_SOC_BIAS_STANDBY:
		if (codec->dapm.bias_level == SND_SOC_BIAS_OFF) {
		if (pdata && gpio_is_valid(pdata->gpio_power))
		gpio_set_value(pdata->gpio_power, 1);
		mdelay(1);
		if (pdata && gpio_is_valid(pdata->gpio_npdn))
		gpio_set_value(pdata->gpio_npdn, 1);
		mdelay(1);

		ret = snd_soc_cache_sync(codec);
		if (ret) {
		dev_err(codec->dev,
		"Failed to sync cache: %d\n", ret);
		return ret;
		}
		}
		snd_soc_update_bits(codec, AK4641_PM1, 0x80, 0x80);
		snd_soc_update_bits(codec, AK4641_PM2, 0x80, 0);
		break;
		case SND_SOC_BIAS_OFF:
		snd_soc_update_bits(codec, AK4641_PM1, 0x80, 0);
		if (pdata && gpio_is_valid(pdata->gpio_npdn))
		gpio_set_value(pdata->gpio_npdn, 0);
		if (pdata && gpio_is_valid(pdata->gpio_power))
		gpio_set_value(pdata->gpio_power, 0);
		codec->cache_sync = 1;
		break;
		}
		codec->dapm.bias_level = level;
		return 0;
		}

		#define AK4641_RATES (SNDRV_PCM_RATE_8000_48000)
		#define AK4641_RATES_BT (SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_11025 \|\
		SNDRV_PCM_RATE_16000)
		#define AK4641_FORMATS (SNDRV_PCM_FMTBIT_S16_LE)

		static struct snd_soc_dai_ops ak4641_i2s_dai_ops = {
		.hw_params = ak4641_i2s_hw_params,
		.set_fmt = ak4641_i2s_set_dai_fmt,
		.digital_mute = ak4641_mute,
		.set_sysclk = ak4641_set_dai_sysclk,
		};

		static struct snd_soc_dai_ops ak4641_pcm_dai_ops = {
		.hw_params = NULL, /* rates are controlled by BT chip */
		.set_fmt = ak4641_pcm_set_dai_fmt,
		.digital_mute = ak4641_mute,
		.set_sysclk = ak4641_set_dai_sysclk,
		};

		struct snd_soc_dai_driver ak4641_dai[] = {
		{
		.name = "ak4641-hifi",
		.id = 1,
		.playback = {
		.stream_name = "HiFi Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = AK4641_RATES,
		.formats = AK4641_FORMATS,
		},
		.capture = {
		.stream_name = "HiFi Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = AK4641_RATES,
		.formats = AK4641_FORMATS,
		},
		.ops = &ak4641_i2s_dai_ops,
		.symmetric_rates = 1,
		},
		{
		.name = "ak4641-voice",
		.id = 1,
		.playback = {
		.stream_name = "Voice Playback",
		.channels_min = 1,
		.channels_max = 1,
		.rates = AK4641_RATES_BT,
		.formats = AK4641_FORMATS,
		},
		.capture = {
		.stream_name = "Voice Capture",
		.channels_min = 1,
		.channels_max = 1,
		.rates = AK4641_RATES_BT,
		.formats = AK4641_FORMATS,
		},
		.ops = &ak4641_pcm_dai_ops,
		.symmetric_rates = 1,
		},
		};

		static int ak4641_suspend(struct snd_soc_codec *codec, pm_message_t state)
		{
		ak4641_set_bias_level(codec, SND_SOC_BIAS_OFF);
		return 0;
		}

		static int ak4641_resume(struct snd_soc_codec *codec)
		{
		ak4641_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
		return 0;
		}

		static int ak4641_probe(struct snd_soc_codec *codec)
		{
		struct ak4641_platform_data *pdata = codec->dev->platform_data;
		int ret;


		if (pdata) {
		if (gpio_is_valid(pdata->gpio_power)) {
		ret = gpio_request_one(pdata->gpio_power,
		GPIOF_OUT_INIT_LOW, "ak4641 power");
		if (ret)
		goto err_out;
		}
		if (gpio_is_valid(pdata->gpio_npdn)) {
		ret = gpio_request_one(pdata->gpio_npdn,
		GPIOF_OUT_INIT_LOW, "ak4641 npdn");
		if (ret)
		goto err_gpio;

		udelay(1); /* > 150 ns */
		gpio_set_value(pdata->gpio_npdn, 1);
		}
		}

		ret = snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_I2C);
		if (ret != 0) {
		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
		goto err_register;
		}

		/* power on device */
		ak4641_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

		return 0;

		err_register:
		if (pdata) {
		if (gpio_is_valid(pdata->gpio_power))
		gpio_set_value(pdata->gpio_power, 0);
		if (gpio_is_valid(pdata->gpio_npdn))
		gpio_free(pdata->gpio_npdn);
		}
		err_gpio:
		if (pdata && gpio_is_valid(pdata->gpio_power))
		gpio_free(pdata->gpio_power);
		err_out:
		return ret;
		}

		static int ak4641_remove(struct snd_soc_codec *codec)
		{
		struct ak4641_platform_data *pdata = codec->dev->platform_data;

		ak4641_set_bias_level(codec, SND_SOC_BIAS_OFF);

		if (pdata) {
		if (gpio_is_valid(pdata->gpio_power)) {
		gpio_set_value(pdata->gpio_power, 0);
		gpio_free(pdata->gpio_power);
		}
		if (gpio_is_valid(pdata->gpio_npdn))
		gpio_free(pdata->gpio_npdn);
		}
		return 0;
		}


		static struct snd_soc_codec_driver soc_codec_dev_ak4641 = {
		.probe = ak4641_probe,
		.remove = ak4641_remove,
		.suspend = ak4641_suspend,
		.resume = ak4641_resume,
		.controls = ak4641_snd_controls,
		.num_controls = ARRAY_SIZE(ak4641_snd_controls),
		.dapm_widgets = ak4641_dapm_widgets,
		.num_dapm_widgets = ARRAY_SIZE(ak4641_dapm_widgets),
		.dapm_routes = ak4641_audio_map,
		.num_dapm_routes = ARRAY_SIZE(ak4641_audio_map),
		.set_bias_level = ak4641_set_bias_level,
		.reg_cache_size = ARRAY_SIZE(ak4641_reg),
		.reg_word_size = sizeof(u8),
		.reg_cache_default = ak4641_reg,
		.reg_cache_step = 1,
		};


		static int __devinit ak4641_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
		{
		struct ak4641_priv *ak4641;
		int ret;

		ak4641 = kzalloc(sizeof(struct ak4641_priv), GFP_KERNEL);
		if (!ak4641)
		return -ENOMEM;

		i2c_set_clientdata(i2c, ak4641);

		ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_ak4641,
		ak4641_dai, ARRAY_SIZE(ak4641_dai));
		if (ret < 0)
		kfree(ak4641);

		return ret;
		}

		static int __devexit ak4641_i2c_remove(struct i2c_client *i2c)
		{
		snd_soc_unregister_codec(&i2c->dev);
		kfree(i2c_get_clientdata(i2c));
		return 0;
		}

		static const struct i2c_device_id ak4641_i2c_id[] = {
		{ "ak4641", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, ak4641_i2c_id);

		static struct i2c_driver ak4641_i2c_driver = {
		.driver = {
		.name = "ak4641",
		.owner = THIS_MODULE,
		},
		.probe = ak4641_i2c_probe,
		.remove = __devexit_p(ak4641_i2c_remove),
		.id_table = ak4641_i2c_id,
		};

		static int __init ak4641_modinit(void)
		{
		int ret;

		ret = i2c_add_driver(&ak4641_i2c_driver);
		if (ret != 0)
		pr_err("Failed to register AK4641 I2C driver: %d\n", ret);

		return ret;
		}
		module_init(ak4641_modinit);

		static void __exit ak4641_exit(void)
		{
		i2c_del_driver(&ak4641_i2c_driver);
		}
		module_exit(ak4641_exit);

		MODULE_DESCRIPTION("SoC AK4641 driver");
		MODULE_AUTHOR("Harald Welte <laforge@gnufiish.org>");
		MODULE_LICENSE("GPL");

sound/soc/codecs/ak4641.h

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Original line number	Diff line number	Diff line
		/*
		* ak4641.h -- AK4641 SoC Audio driver
		*
		* Copyright 2008 Harald Welte <laforge@gnufiish.org>
		*
		* Based on ak4535.h
		*
		* 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.
		*/

		#ifndef _AK4641_H
		#define _AK4641_H

		/* AK4641 register space */

		#define AK4641_PM1 0x00
		#define AK4641_PM2 0x01
		#define AK4641_SIG1 0x02
		#define AK4641_SIG2 0x03
		#define AK4641_MODE1 0x04
		#define AK4641_MODE2 0x05
		#define AK4641_DAC 0x06
		#define AK4641_MIC 0x07
		#define AK4641_TIMER 0x08
		#define AK4641_ALC1 0x09
		#define AK4641_ALC2 0x0a
		#define AK4641_PGA 0x0b
		#define AK4641_LATT 0x0c
		#define AK4641_RATT 0x0d
		#define AK4641_VOL 0x0e
		#define AK4641_STATUS 0x0f
		#define AK4641_EQLO 0x10
		#define AK4641_EQMID 0x11
		#define AK4641_EQHI 0x12
		#define AK4641_BTIF 0x13

		#define AK4641_CACHEREGNUM 0x14



		#define AK4641_DAI_HIFI 0
		#define AK4641_DAI_VOICE 1


		#endif