sound/soc/codecs/tlv320aic32x4.c

/*
 * linux/sound/soc/codecs/tlv320aic32x4.c
 *
 * Copyright 2011 Vista Silicon S.L.
 *
 * Author: Javier Martin <javier.martin@vista-silicon.com>
 *
 * Based on sound/soc/codecs/wm8974 and TI driver for kernel 2.6.27.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/cdev.h>
#include <linux/slab.h>

#include <sound/tlv320aic32x4.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>
#include <sound/tlv.h>

#include "tlv320aic32x4.h"

struct aic32x4_rate_divs {
	u32 mclk;
	u32 rate;
	u8 p_val;
	u8 pll_j;
	u16 pll_d;
	u16 dosr;
	u8 ndac;
	u8 mdac;
	u8 aosr;
	u8 nadc;
	u8 madc;
	u8 blck_N;
};

struct aic32x4_priv {
	struct regmap *regmap;
	u32 sysclk;
	u32 power_cfg;
	u32 micpga_routing;
	bool swapdacs;
	int rstn_gpio;
};

/* 0dB min, 1dB steps */
static DECLARE_TLV_DB_SCALE(tlv_step_1, 0, 100, 0);
/* 0dB min, 0.5dB steps */
static DECLARE_TLV_DB_SCALE(tlv_step_0_5, 0, 50, 0);

static const struct snd_kcontrol_new aic32x4_snd_controls[] = {
	SOC_DOUBLE_R_TLV("PCM Playback Volume", AIC32X4_LDACVOL,
			AIC32X4_RDACVOL, 0, 0x30, 0, tlv_step_0_5),
	SOC_DOUBLE_R_TLV("HP Driver Gain Volume", AIC32X4_HPLGAIN,
			AIC32X4_HPRGAIN, 0, 0x1D, 0, tlv_step_1),
	SOC_DOUBLE_R_TLV("LO Driver Gain Volume", AIC32X4_LOLGAIN,
			AIC32X4_LORGAIN, 0, 0x1D, 0, tlv_step_1),
	SOC_DOUBLE_R("HP DAC Playback Switch", AIC32X4_HPLGAIN,
			AIC32X4_HPRGAIN, 6, 0x01, 1),
	SOC_DOUBLE_R("LO DAC Playback Switch", AIC32X4_LOLGAIN,
			AIC32X4_LORGAIN, 6, 0x01, 1),
	SOC_DOUBLE_R("Mic PGA Switch", AIC32X4_LMICPGAVOL,
			AIC32X4_RMICPGAVOL, 7, 0x01, 1),

	SOC_SINGLE("ADCFGA Left Mute Switch", AIC32X4_ADCFGA, 7, 1, 0),
	SOC_SINGLE("ADCFGA Right Mute Switch", AIC32X4_ADCFGA, 3, 1, 0),

	SOC_DOUBLE_R_TLV("ADC Level Volume", AIC32X4_LADCVOL,
			AIC32X4_RADCVOL, 0, 0x28, 0, tlv_step_0_5),
	SOC_DOUBLE_R_TLV("PGA Level Volume", AIC32X4_LMICPGAVOL,
			AIC32X4_RMICPGAVOL, 0, 0x5f, 0, tlv_step_0_5),

	SOC_SINGLE("Auto-mute Switch", AIC32X4_DACMUTE, 4, 7, 0),

	SOC_SINGLE("AGC Left Switch", AIC32X4_LAGC1, 7, 1, 0),
	SOC_SINGLE("AGC Right Switch", AIC32X4_RAGC1, 7, 1, 0),
	SOC_DOUBLE_R("AGC Target Level", AIC32X4_LAGC1, AIC32X4_RAGC1,
			4, 0x07, 0),
	SOC_DOUBLE_R("AGC Gain Hysteresis", AIC32X4_LAGC1, AIC32X4_RAGC1,
			0, 0x03, 0),
	SOC_DOUBLE_R("AGC Hysteresis", AIC32X4_LAGC2, AIC32X4_RAGC2,
			6, 0x03, 0),
	SOC_DOUBLE_R("AGC Noise Threshold", AIC32X4_LAGC2, AIC32X4_RAGC2,
			1, 0x1F, 0),
	SOC_DOUBLE_R("AGC Max PGA", AIC32X4_LAGC3, AIC32X4_RAGC3,
			0, 0x7F, 0),
	SOC_DOUBLE_R("AGC Attack Time", AIC32X4_LAGC4, AIC32X4_RAGC4,
			3, 0x1F, 0),
	SOC_DOUBLE_R("AGC Decay Time", AIC32X4_LAGC5, AIC32X4_RAGC5,
			3, 0x1F, 0),
	SOC_DOUBLE_R("AGC Noise Debounce", AIC32X4_LAGC6, AIC32X4_RAGC6,
			0, 0x1F, 0),
	SOC_DOUBLE_R("AGC Signal Debounce", AIC32X4_LAGC7, AIC32X4_RAGC7,
			0, 0x0F, 0),
};

static const struct aic32x4_rate_divs aic32x4_divs[] = {
	/* 8k rate */
	{AIC32X4_FREQ_12000000, 8000, 1, 7, 6800, 768, 5, 3, 128, 5, 18, 24},
	{AIC32X4_FREQ_24000000, 8000, 2, 7, 6800, 768, 15, 1, 64, 45, 4, 24},
	{AIC32X4_FREQ_25000000, 8000, 2, 7, 3728, 768, 15, 1, 64, 45, 4, 24},
	/* 11.025k rate */
	{AIC32X4_FREQ_12000000, 11025, 1, 7, 5264, 512, 8, 2, 128, 8, 8, 16},
	{AIC32X4_FREQ_24000000, 11025, 2, 7, 5264, 512, 16, 1, 64, 32, 4, 16},
	/* 16k rate */
	{AIC32X4_FREQ_12000000, 16000, 1, 7, 6800, 384, 5, 3, 128, 5, 9, 12},
	{AIC32X4_FREQ_24000000, 16000, 2, 7, 6800, 384, 15, 1, 64, 18, 5, 12},
	{AIC32X4_FREQ_25000000, 16000, 2, 7, 3728, 384, 15, 1, 64, 18, 5, 12},
	/* 22.05k rate */
	{AIC32X4_FREQ_12000000, 22050, 1, 7, 5264, 256, 4, 4, 128, 4, 8, 8},
	{AIC32X4_FREQ_24000000, 22050, 2, 7, 5264, 256, 16, 1, 64, 16, 4, 8},
	{AIC32X4_FREQ_25000000, 22050, 2, 7, 2253, 256, 16, 1, 64, 16, 4, 8},
	/* 32k rate */
	{AIC32X4_FREQ_12000000, 32000, 1, 7, 1680, 192, 2, 7, 64, 2, 21, 6},
	{AIC32X4_FREQ_24000000, 32000, 2, 7, 1680, 192, 7, 2, 64, 7, 6, 6},
	/* 44.1k rate */
	{AIC32X4_FREQ_12000000, 44100, 1, 7, 5264, 128, 2, 8, 128, 2, 8, 4},
	{AIC32X4_FREQ_24000000, 44100, 2, 7, 5264, 128, 8, 2, 64, 8, 4, 4},
	{AIC32X4_FREQ_25000000, 44100, 2, 7, 2253, 128, 8, 2, 64, 8, 4, 4},
	/* 48k rate */
	{AIC32X4_FREQ_12000000, 48000, 1, 8, 1920, 128, 2, 8, 128, 2, 8, 4},
	{AIC32X4_FREQ_24000000, 48000, 2, 8, 1920, 128, 8, 2, 64, 8, 4, 4},
	{AIC32X4_FREQ_25000000, 48000, 2, 7, 8643, 128, 8, 2, 64, 8, 4, 4}
};

static const struct snd_kcontrol_new hpl_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("L_DAC Switch", AIC32X4_HPLROUTE, 3, 1, 0),
	SOC_DAPM_SINGLE("IN1_L Switch", AIC32X4_HPLROUTE, 2, 1, 0),
};

static const struct snd_kcontrol_new hpr_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("R_DAC Switch", AIC32X4_HPRROUTE, 3, 1, 0),
	SOC_DAPM_SINGLE("IN1_R Switch", AIC32X4_HPRROUTE, 2, 1, 0),
};

static const struct snd_kcontrol_new lol_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("L_DAC Switch", AIC32X4_LOLROUTE, 3, 1, 0),
};

static const struct snd_kcontrol_new lor_output_mixer_controls[] = {
	SOC_DAPM_SINGLE("R_DAC Switch", AIC32X4_LORROUTE, 3, 1, 0),
};

static const struct snd_kcontrol_new left_input_mixer_controls[] = {
	SOC_DAPM_SINGLE("IN1_L P Switch", AIC32X4_LMICPGAPIN, 6, 1, 0),
	SOC_DAPM_SINGLE("IN2_L P Switch", AIC32X4_LMICPGAPIN, 4, 1, 0),
	SOC_DAPM_SINGLE("IN3_L P Switch", AIC32X4_LMICPGAPIN, 2, 1, 0),
};

static const struct snd_kcontrol_new right_input_mixer_controls[] = {
	SOC_DAPM_SINGLE("IN1_R P Switch", AIC32X4_RMICPGAPIN, 6, 1, 0),
	SOC_DAPM_SINGLE("IN2_R P Switch", AIC32X4_RMICPGAPIN, 4, 1, 0),
	SOC_DAPM_SINGLE("IN3_R P Switch", AIC32X4_RMICPGAPIN, 2, 1, 0),
};

static const struct snd_soc_dapm_widget aic32x4_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("Left DAC", "Left Playback", AIC32X4_DACSETUP, 7, 0),
	SND_SOC_DAPM_MIXER("HPL Output Mixer", SND_SOC_NOPM, 0, 0,
			   &hpl_output_mixer_controls[0],
			   ARRAY_SIZE(hpl_output_mixer_controls)),
	SND_SOC_DAPM_PGA("HPL Power", AIC32X4_OUTPWRCTL, 5, 0, NULL, 0),

	SND_SOC_DAPM_MIXER("LOL Output Mixer", SND_SOC_NOPM, 0, 0,
			   &lol_output_mixer_controls[0],
			   ARRAY_SIZE(lol_output_mixer_controls)),
	SND_SOC_DAPM_PGA("LOL Power", AIC32X4_OUTPWRCTL, 3, 0, NULL, 0),

	SND_SOC_DAPM_DAC("Right DAC", "Right Playback", AIC32X4_DACSETUP, 6, 0),
	SND_SOC_DAPM_MIXER("HPR Output Mixer", SND_SOC_NOPM, 0, 0,
			   &hpr_output_mixer_controls[0],
			   ARRAY_SIZE(hpr_output_mixer_controls)),
	SND_SOC_DAPM_PGA("HPR Power", AIC32X4_OUTPWRCTL, 4, 0, NULL, 0),
	SND_SOC_DAPM_MIXER("LOR Output Mixer", SND_SOC_NOPM, 0, 0,
			   &lor_output_mixer_controls[0],
			   ARRAY_SIZE(lor_output_mixer_controls)),
	SND_SOC_DAPM_PGA("LOR Power", AIC32X4_OUTPWRCTL, 2, 0, NULL, 0),
	SND_SOC_DAPM_MIXER("Left Input Mixer", SND_SOC_NOPM, 0, 0,
			   &left_input_mixer_controls[0],
			   ARRAY_SIZE(left_input_mixer_controls)),
	SND_SOC_DAPM_MIXER("Right Input Mixer", SND_SOC_NOPM, 0, 0,
			   &right_input_mixer_controls[0],
			   ARRAY_SIZE(right_input_mixer_controls)),
	SND_SOC_DAPM_ADC("Left ADC", "Left Capture", AIC32X4_ADCSETUP, 7, 0),
	SND_SOC_DAPM_ADC("Right ADC", "Right Capture", AIC32X4_ADCSETUP, 6, 0),
	SND_SOC_DAPM_MICBIAS("Mic Bias", AIC32X4_MICBIAS, 6, 0),

	SND_SOC_DAPM_OUTPUT("HPL"),
	SND_SOC_DAPM_OUTPUT("HPR"),
	SND_SOC_DAPM_OUTPUT("LOL"),
	SND_SOC_DAPM_OUTPUT("LOR"),
	SND_SOC_DAPM_INPUT("IN1_L"),
	SND_SOC_DAPM_INPUT("IN1_R"),
	SND_SOC_DAPM_INPUT("IN2_L"),
	SND_SOC_DAPM_INPUT("IN2_R"),
	SND_SOC_DAPM_INPUT("IN3_L"),
	SND_SOC_DAPM_INPUT("IN3_R"),
};

static const struct snd_soc_dapm_route aic32x4_dapm_routes[] = {
	/* Left Output */
	{"HPL Output Mixer", "L_DAC Switch", "Left DAC"},
	{"HPL Output Mixer", "IN1_L Switch", "IN1_L"},

	{"HPL Power", NULL, "HPL Output Mixer"},
	{"HPL", NULL, "HPL Power"},

	{"LOL Output Mixer", "L_DAC Switch", "Left DAC"},

	{"LOL Power", NULL, "LOL Output Mixer"},
	{"LOL", NULL, "LOL Power"},

	/* Right Output */
	{"HPR Output Mixer", "R_DAC Switch", "Right DAC"},
	{"HPR Output Mixer", "IN1_R Switch", "IN1_R"},

	{"HPR Power", NULL, "HPR Output Mixer"},
	{"HPR", NULL, "HPR Power"},

	{"LOR Output Mixer", "R_DAC Switch", "Right DAC"},

	{"LOR Power", NULL, "LOR Output Mixer"},
	{"LOR", NULL, "LOR Power"},

	/* Left input */
	{"Left Input Mixer", "IN1_L P Switch", "IN1_L"},
	{"Left Input Mixer", "IN2_L P Switch", "IN2_L"},
	{"Left Input Mixer", "IN3_L P Switch", "IN3_L"},

	{"Left ADC", NULL, "Left Input Mixer"},

	/* Right Input */
	{"Right Input Mixer", "IN1_R P Switch", "IN1_R"},
	{"Right Input Mixer", "IN2_R P Switch", "IN2_R"},
	{"Right Input Mixer", "IN3_R P Switch", "IN3_R"},

	{"Right ADC", NULL, "Right Input Mixer"},
};

static const struct regmap_range_cfg aic32x4_regmap_pages[] = {
	{
		.selector_reg = 0,
		.selector_mask  = 0xff,
		.window_start = 0,
		.window_len = 128,
		.range_min = 0,
		.range_max = AIC32X4_RMICPGAVOL,
	},
};

static const struct regmap_config aic32x4_regmap = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = AIC32X4_RMICPGAVOL,
	.ranges = aic32x4_regmap_pages,
	.num_ranges = ARRAY_SIZE(aic32x4_regmap_pages),
};

static inline int aic32x4_get_divs(int mclk, int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(aic32x4_divs); i++) {
		if ((aic32x4_divs[i].rate == rate)
		    && (aic32x4_divs[i].mclk == mclk)) {
			return i;
		}
	}
	printk(KERN_ERR "aic32x4: master clock and sample rate is not supported\n");
	return -EINVAL;
}

static int aic32x4_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 aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec);

	switch (freq) {
	case AIC32X4_FREQ_12000000:
	case AIC32X4_FREQ_24000000:
	case AIC32X4_FREQ_25000000:
		aic32x4->sysclk = freq;
		return 0;
	}
	printk(KERN_ERR "aic32x4: invalid frequency to set DAI system clock\n");
	return -EINVAL;
}

static int aic32x4_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u8 iface_reg_1;
	u8 iface_reg_2;
	u8 iface_reg_3;

	iface_reg_1 = snd_soc_read(codec, AIC32X4_IFACE1);
	iface_reg_1 = iface_reg_1 & ~(3 << 6 | 3 << 2);
	iface_reg_2 = snd_soc_read(codec, AIC32X4_IFACE2);
	iface_reg_2 = 0;
	iface_reg_3 = snd_soc_read(codec, AIC32X4_IFACE3);
	iface_reg_3 = iface_reg_3 & ~(1 << 3);

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		iface_reg_1 |= AIC32X4_BCLKMASTER | AIC32X4_WCLKMASTER;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		printk(KERN_ERR "aic32x4: invalid DAI master/slave interface\n");
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		break;
	case SND_SOC_DAIFMT_DSP_A:
		iface_reg_1 |= (AIC32X4_DSP_MODE << AIC32X4_PLLJ_SHIFT);
		iface_reg_3 |= (1 << 3); /* invert bit clock */
		iface_reg_2 = 0x01; /* add offset 1 */
		break;
	case SND_SOC_DAIFMT_DSP_B:
		iface_reg_1 |= (AIC32X4_DSP_MODE << AIC32X4_PLLJ_SHIFT);
		iface_reg_3 |= (1 << 3); /* invert bit clock */
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		iface_reg_1 |=
			(AIC32X4_RIGHT_JUSTIFIED_MODE << AIC32X4_PLLJ_SHIFT);
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		iface_reg_1 |=
			(AIC32X4_LEFT_JUSTIFIED_MODE << AIC32X4_PLLJ_SHIFT);
		break;
	default:
		printk(KERN_ERR "aic32x4: invalid DAI interface format\n");
		return -EINVAL;
	}

	snd_soc_write(codec, AIC32X4_IFACE1, iface_reg_1);
	snd_soc_write(codec, AIC32X4_IFACE2, iface_reg_2);
	snd_soc_write(codec, AIC32X4_IFACE3, iface_reg_3);
	return 0;
}

static int aic32x4_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params,
			     struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	struct aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec);
	u8 data;
	int i;

	i = aic32x4_get_divs(aic32x4->sysclk, params_rate(params));
	if (i < 0) {
		printk(KERN_ERR "aic32x4: sampling rate not supported\n");
		return i;
	}

	/* Use PLL as CODEC_CLKIN and DAC_MOD_CLK as BDIV_CLKIN */
	snd_soc_write(codec, AIC32X4_CLKMUX, AIC32X4_PLLCLKIN);
	snd_soc_write(codec, AIC32X4_IFACE3, AIC32X4_DACMOD2BCLK);

	/* We will fix R value to 1 and will make P & J=K.D as varialble */
	data = snd_soc_read(codec, AIC32X4_PLLPR);
	data &= ~(7 << 4);
	snd_soc_write(codec, AIC32X4_PLLPR,
		      (data | (aic32x4_divs[i].p_val << 4) | 0x01));

	snd_soc_write(codec, AIC32X4_PLLJ, aic32x4_divs[i].pll_j);

	snd_soc_write(codec, AIC32X4_PLLDMSB, (aic32x4_divs[i].pll_d >> 8));
	snd_soc_write(codec, AIC32X4_PLLDLSB,
		      (aic32x4_divs[i].pll_d & 0xff));

	/* NDAC divider value */
	data = snd_soc_read(codec, AIC32X4_NDAC);
	data &= ~(0x7f);
	snd_soc_write(codec, AIC32X4_NDAC, data | aic32x4_divs[i].ndac);

	/* MDAC divider value */
	data = snd_soc_read(codec, AIC32X4_MDAC);
	data &= ~(0x7f);
	snd_soc_write(codec, AIC32X4_MDAC, data | aic32x4_divs[i].mdac);

	/* DOSR MSB & LSB values */
	snd_soc_write(codec, AIC32X4_DOSRMSB, aic32x4_divs[i].dosr >> 8);
	snd_soc_write(codec, AIC32X4_DOSRLSB,
		      (aic32x4_divs[i].dosr & 0xff));

	/* NADC divider value */
	data = snd_soc_read(codec, AIC32X4_NADC);
	data &= ~(0x7f);
	snd_soc_write(codec, AIC32X4_NADC, data | aic32x4_divs[i].nadc);

	/* MADC divider value */
	data = snd_soc_read(codec, AIC32X4_MADC);
	data &= ~(0x7f);
	snd_soc_write(codec, AIC32X4_MADC, data | aic32x4_divs[i].madc);

	/* AOSR value */
	snd_soc_write(codec, AIC32X4_AOSR, aic32x4_divs[i].aosr);

	/* BCLK N divider */
	data = snd_soc_read(codec, AIC32X4_BCLKN);
	data &= ~(0x7f);
	snd_soc_write(codec, AIC32X4_BCLKN, data | aic32x4_divs[i].blck_N);

	data = snd_soc_read(codec, AIC32X4_IFACE1);
	data = data & ~(3 << 4);
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		data |= (AIC32X4_WORD_LEN_20BITS << AIC32X4_DOSRMSB_SHIFT);
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		data |= (AIC32X4_WORD_LEN_24BITS << AIC32X4_DOSRMSB_SHIFT);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		data |= (AIC32X4_WORD_LEN_32BITS << AIC32X4_DOSRMSB_SHIFT);
		break;
	}
	snd_soc_write(codec, AIC32X4_IFACE1, data);

	if (params_channels(params) == 1) {
		data = AIC32X4_RDAC2LCHN | AIC32X4_LDAC2LCHN;
	} else {
		if (aic32x4->swapdacs)
			data = AIC32X4_RDAC2LCHN | AIC32X4_LDAC2RCHN;
		else
			data = AIC32X4_LDAC2LCHN | AIC32X4_RDAC2RCHN;
	}
	snd_soc_update_bits(codec, AIC32X4_DACSETUP, AIC32X4_DAC_CHAN_MASK,
			data);

	return 0;
}

static int aic32x4_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u8 dac_reg;

	dac_reg = snd_soc_read(codec, AIC32X4_DACMUTE) & ~AIC32X4_MUTEON;
	if (mute)
		snd_soc_write(codec, AIC32X4_DACMUTE, dac_reg | AIC32X4_MUTEON);
	else
		snd_soc_write(codec, AIC32X4_DACMUTE, dac_reg);
	return 0;
}

static int aic32x4_set_bias_level(struct snd_soc_codec *codec,
				  enum snd_soc_bias_level level)
{
	switch (level) {
	case SND_SOC_BIAS_ON:
		/* Switch on PLL */
		snd_soc_update_bits(codec, AIC32X4_PLLPR,
				    AIC32X4_PLLEN, AIC32X4_PLLEN);

		/* Switch on NDAC Divider */
		snd_soc_update_bits(codec, AIC32X4_NDAC,
				    AIC32X4_NDACEN, AIC32X4_NDACEN);

		/* Switch on MDAC Divider */
		snd_soc_update_bits(codec, AIC32X4_MDAC,
				    AIC32X4_MDACEN, AIC32X4_MDACEN);

		/* Switch on NADC Divider */
		snd_soc_update_bits(codec, AIC32X4_NADC,
				    AIC32X4_NADCEN, AIC32X4_NADCEN);

		/* Switch on MADC Divider */
		snd_soc_update_bits(codec, AIC32X4_MADC,
				    AIC32X4_MADCEN, AIC32X4_MADCEN);

		/* Switch on BCLK_N Divider */
		snd_soc_update_bits(codec, AIC32X4_BCLKN,
				    AIC32X4_BCLKEN, AIC32X4_BCLKEN);
		break;
	case SND_SOC_BIAS_PREPARE:
		break;
	case SND_SOC_BIAS_STANDBY:
		/* Switch off PLL */
		snd_soc_update_bits(codec, AIC32X4_PLLPR,
				    AIC32X4_PLLEN, 0);

		/* Switch off NDAC Divider */
		snd_soc_update_bits(codec, AIC32X4_NDAC,
				    AIC32X4_NDACEN, 0);

		/* Switch off MDAC Divider */
		snd_soc_update_bits(codec, AIC32X4_MDAC,
				    AIC32X4_MDACEN, 0);

		/* Switch off NADC Divider */
		snd_soc_update_bits(codec, AIC32X4_NADC,
				    AIC32X4_NADCEN, 0);

		/* Switch off MADC Divider */
		snd_soc_update_bits(codec, AIC32X4_MADC,
				    AIC32X4_MADCEN, 0);

		/* Switch off BCLK_N Divider */
		snd_soc_update_bits(codec, AIC32X4_BCLKN,
				    AIC32X4_BCLKEN, 0);
		break;
	case SND_SOC_BIAS_OFF:
		break;
	}
	codec->dapm.bias_level = level;
	return 0;
}

#define AIC32X4_RATES	SNDRV_PCM_RATE_8000_48000
#define AIC32X4_FORMATS	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE \
			 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S32_LE)

static const struct snd_soc_dai_ops aic32x4_ops = {
	.hw_params = aic32x4_hw_params,
	.digital_mute = aic32x4_mute,
	.set_fmt = aic32x4_set_dai_fmt,
	.set_sysclk = aic32x4_set_dai_sysclk,
};

static struct snd_soc_dai_driver aic32x4_dai = {
	.name = "tlv320aic32x4-hifi",
	.playback = {
		     .stream_name = "Playback",
		     .channels_min = 1,
		     .channels_max = 2,
		     .rates = AIC32X4_RATES,
		     .formats = AIC32X4_FORMATS,},
	.capture = {
		    .stream_name = "Capture",
		    .channels_min = 1,
		    .channels_max = 2,
		    .rates = AIC32X4_RATES,
		    .formats = AIC32X4_FORMATS,},
	.ops = &aic32x4_ops,
	.symmetric_rates = 1,
};

static int aic32x4_suspend(struct snd_soc_codec *codec)
{
	aic32x4_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
}

static int aic32x4_resume(struct snd_soc_codec *codec)
{
	aic32x4_set_bias_level(codec, SND_SOC_BIAS_STANDBY);
	return 0;
}

static int aic32x4_probe(struct snd_soc_codec *codec)
{
	struct aic32x4_priv *aic32x4 = snd_soc_codec_get_drvdata(codec);
	u32 tmp_reg;

	snd_soc_codec_set_cache_io(codec, 8, 8, SND_SOC_REGMAP);

	if (aic32x4->rstn_gpio >= 0) {
		ndelay(10);
		gpio_set_value(aic32x4->rstn_gpio, 1);
	}

	snd_soc_write(codec, AIC32X4_RESET, 0x01);

	/* Power platform configuration */
	if (aic32x4->power_cfg & AIC32X4_PWR_MICBIAS_2075_LDOIN) {
		snd_soc_write(codec, AIC32X4_MICBIAS, AIC32X4_MICBIAS_LDOIN |
						      AIC32X4_MICBIAS_2075V);
	}
	if (aic32x4->power_cfg & AIC32X4_PWR_AVDD_DVDD_WEAK_DISABLE) {
		snd_soc_write(codec, AIC32X4_PWRCFG, AIC32X4_AVDDWEAKDISABLE);
	}

	tmp_reg = (aic32x4->power_cfg & AIC32X4_PWR_AIC32X4_LDO_ENABLE) ?
			AIC32X4_LDOCTLEN : 0;
	snd_soc_write(codec, AIC32X4_LDOCTL, tmp_reg);

	tmp_reg = snd_soc_read(codec, AIC32X4_CMMODE);
	if (aic32x4->power_cfg & AIC32X4_PWR_CMMODE_LDOIN_RANGE_18_36) {
		tmp_reg |= AIC32X4_LDOIN_18_36;
	}
	if (aic32x4->power_cfg & AIC32X4_PWR_CMMODE_HP_LDOIN_POWERED) {
		tmp_reg |= AIC32X4_LDOIN2HP;
	}
	snd_soc_write(codec, AIC32X4_CMMODE, tmp_reg);

	/* Mic PGA routing */
	if (aic32x4->micpga_routing & AIC32X4_MICPGA_ROUTE_LMIC_IN2R_10K)
		snd_soc_write(codec, AIC32X4_LMICPGANIN, AIC32X4_LMICPGANIN_IN2R_10K);
	else
		snd_soc_write(codec, AIC32X4_LMICPGANIN, AIC32X4_LMICPGANIN_CM1L_10K);
	if (aic32x4->micpga_routing & AIC32X4_MICPGA_ROUTE_RMIC_IN1L_10K)
		snd_soc_write(codec, AIC32X4_RMICPGANIN, AIC32X4_RMICPGANIN_IN1L_10K);
	else
		snd_soc_write(codec, AIC32X4_RMICPGANIN, AIC32X4_RMICPGANIN_CM1R_10K);

	aic32x4_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	/*
	 * Workaround: for an unknown reason, the ADC needs to be powered up
	 * and down for the first capture to work properly. It seems related to
	 * a HW BUG or some kind of behavior not documented in the datasheet.
	 */
	tmp_reg = snd_soc_read(codec, AIC32X4_ADCSETUP);
	snd_soc_write(codec, AIC32X4_ADCSETUP, tmp_reg |
				AIC32X4_LADC_EN | AIC32X4_RADC_EN);
	snd_soc_write(codec, AIC32X4_ADCSETUP, tmp_reg);

	return 0;
}

static int aic32x4_remove(struct snd_soc_codec *codec)
{
	aic32x4_set_bias_level(codec, SND_SOC_BIAS_OFF);
	return 0;
}

static struct snd_soc_codec_driver soc_codec_dev_aic32x4 = {
	.probe = aic32x4_probe,
	.remove = aic32x4_remove,
	.suspend = aic32x4_suspend,
	.resume = aic32x4_resume,
	.set_bias_level = aic32x4_set_bias_level,

	.controls = aic32x4_snd_controls,
	.num_controls = ARRAY_SIZE(aic32x4_snd_controls),
	.dapm_widgets = aic32x4_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(aic32x4_dapm_widgets),
	.dapm_routes = aic32x4_dapm_routes,
	.num_dapm_routes = ARRAY_SIZE(aic32x4_dapm_routes),
};

static int aic32x4_i2c_probe(struct i2c_client *i2c,
			     const struct i2c_device_id *id)
{
	struct aic32x4_pdata *pdata = i2c->dev.platform_data;
	struct aic32x4_priv *aic32x4;
	int ret;

	aic32x4 = devm_kzalloc(&i2c->dev, sizeof(struct aic32x4_priv),
			       GFP_KERNEL);
	if (aic32x4 == NULL)
		return -ENOMEM;

	aic32x4->regmap = devm_regmap_init_i2c(i2c, &aic32x4_regmap);
	if (IS_ERR(aic32x4->regmap))
		return PTR_ERR(aic32x4->regmap);

	i2c_set_clientdata(i2c, aic32x4);

	if (pdata) {
		aic32x4->power_cfg = pdata->power_cfg;
		aic32x4->swapdacs = pdata->swapdacs;
		aic32x4->micpga_routing = pdata->micpga_routing;
		aic32x4->rstn_gpio = pdata->rstn_gpio;
	} else {
		aic32x4->power_cfg = 0;
		aic32x4->swapdacs = false;
		aic32x4->micpga_routing = 0;
		aic32x4->rstn_gpio = -1;
	}

	if (aic32x4->rstn_gpio >= 0) {
		ret = devm_gpio_request_one(&i2c->dev, aic32x4->rstn_gpio,
				GPIOF_OUT_INIT_LOW, "tlv320aic32x4 rstn");
		if (ret != 0)
			return ret;
	}

	ret = snd_soc_register_codec(&i2c->dev,
			&soc_codec_dev_aic32x4, &aic32x4_dai, 1);
	return ret;
}

static int aic32x4_i2c_remove(struct i2c_client *client)
{
	snd_soc_unregister_codec(&client->dev);
	return 0;
}

static const struct i2c_device_id aic32x4_i2c_id[] = {
	{ "tlv320aic32x4", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, aic32x4_i2c_id);

static struct i2c_driver aic32x4_i2c_driver = {
	.driver = {
		.name = "tlv320aic32x4",
		.owner = THIS_MODULE,
	},
	.probe =    aic32x4_i2c_probe,
	.remove =   aic32x4_i2c_remove,
	.id_table = aic32x4_i2c_id,
};

module_i2c_driver(aic32x4_i2c_driver);

MODULE_DESCRIPTION("ASoC tlv320aic32x4 codec driver");
MODULE_AUTHOR("Javier Martin <javier.martin@vista-silicon.com>");
MODULE_LICENSE("GPL");