/*
 * max98371.c -- ALSA SoC Stereo MAX98371 driver
 *
 * Copyright 2015-16 Maxim Integrated Products
 *
 * 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/i2c.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>
#include "max98371.h"

static const char *const monomix_text[] = {
	"Left", "Right", "LeftRightDiv2",
};

static const char *const hpf_cutoff_txt[] = {
	"Disable", "DC Block", "50Hz",
	"100Hz", "200Hz", "400Hz", "800Hz",
};

static SOC_ENUM_SINGLE_DECL(max98371_monomix, MAX98371_MONOMIX_CFG, 0,
		monomix_text);

static SOC_ENUM_SINGLE_DECL(max98371_hpf_cutoff, MAX98371_HPF, 0,
		hpf_cutoff_txt);

static const DECLARE_TLV_DB_RANGE(max98371_dht_min_gain,
	0, 1, TLV_DB_SCALE_ITEM(537, 66, 0),
	2, 3, TLV_DB_SCALE_ITEM(677, 82, 0),
	4, 5, TLV_DB_SCALE_ITEM(852, 104, 0),
	6, 7, TLV_DB_SCALE_ITEM(1072, 131, 0),
	8, 9, TLV_DB_SCALE_ITEM(1350, 165, 0),
	10, 11, TLV_DB_SCALE_ITEM(1699, 101, 0),
);

static const DECLARE_TLV_DB_RANGE(max98371_dht_max_gain,
	0, 1, TLV_DB_SCALE_ITEM(537, 66, 0),
	2, 3, TLV_DB_SCALE_ITEM(677, 82, 0),
	4, 5, TLV_DB_SCALE_ITEM(852, 104, 0),
	6, 7, TLV_DB_SCALE_ITEM(1072, 131, 0),
	8, 9, TLV_DB_SCALE_ITEM(1350, 165, 0),
	10, 11, TLV_DB_SCALE_ITEM(1699, 208, 0),
);

static const DECLARE_TLV_DB_RANGE(max98371_dht_rot_gain,
	0, 1, TLV_DB_SCALE_ITEM(-50, -50, 0),
	2, 6, TLV_DB_SCALE_ITEM(-100, -100, 0),
	7, 8, TLV_DB_SCALE_ITEM(-800, -200, 0),
	9, 11, TLV_DB_SCALE_ITEM(-1200, -300, 0),
	12, 13, TLV_DB_SCALE_ITEM(-2000, -200, 0),
	14, 15, TLV_DB_SCALE_ITEM(-2500, -500, 0),
);

static const struct reg_default max98371_reg[] = {
	{ 0x01, 0x00 },
	{ 0x02, 0x00 },
	{ 0x03, 0x00 },
	{ 0x04, 0x00 },
	{ 0x05, 0x00 },
	{ 0x06, 0x00 },
	{ 0x07, 0x00 },
	{ 0x08, 0x00 },
	{ 0x09, 0x00 },
	{ 0x0A, 0x00 },
	{ 0x10, 0x06 },
	{ 0x11, 0x08 },
	{ 0x14, 0x80 },
	{ 0x15, 0x00 },
	{ 0x16, 0x00 },
	{ 0x18, 0x00 },
	{ 0x19, 0x00 },
	{ 0x1C, 0x00 },
	{ 0x1D, 0x00 },
	{ 0x1E, 0x00 },
	{ 0x1F, 0x00 },
	{ 0x20, 0x00 },
	{ 0x21, 0x00 },
	{ 0x22, 0x00 },
	{ 0x23, 0x00 },
	{ 0x24, 0x00 },
	{ 0x25, 0x00 },
	{ 0x26, 0x00 },
	{ 0x27, 0x00 },
	{ 0x28, 0x00 },
	{ 0x29, 0x00 },
	{ 0x2A, 0x00 },
	{ 0x2B, 0x00 },
	{ 0x2C, 0x00 },
	{ 0x2D, 0x00 },
	{ 0x2E, 0x0B },
	{ 0x31, 0x00 },
	{ 0x32, 0x18 },
	{ 0x33, 0x00 },
	{ 0x34, 0x00 },
	{ 0x36, 0x00 },
	{ 0x37, 0x00 },
	{ 0x38, 0x00 },
	{ 0x39, 0x00 },
	{ 0x3A, 0x00 },
	{ 0x3B, 0x00 },
	{ 0x3C, 0x00 },
	{ 0x3D, 0x00 },
	{ 0x3E, 0x00 },
	{ 0x3F, 0x00 },
	{ 0x40, 0x00 },
	{ 0x41, 0x00 },
	{ 0x42, 0x00 },
	{ 0x43, 0x00 },
	{ 0x4A, 0x00 },
	{ 0x4B, 0x00 },
	{ 0x4C, 0x00 },
	{ 0x4D, 0x00 },
	{ 0x4E, 0x00 },
	{ 0x50, 0x00 },
	{ 0x51, 0x00 },
	{ 0x55, 0x00 },
	{ 0x58, 0x00 },
	{ 0x59, 0x00 },
	{ 0x5C, 0x00 },
	{ 0xFF, 0x43 },
};

static bool max98371_volatile_register(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX98371_IRQ_CLEAR1:
	case MAX98371_IRQ_CLEAR2:
	case MAX98371_IRQ_CLEAR3:
	case MAX98371_VERSION:
		return true;
	default:
		return false;
	}
}

static bool max98371_readable_register(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case MAX98371_SOFT_RESET:
		return false;
	default:
		return true;
	}
};

static const DECLARE_TLV_DB_RANGE(max98371_gain_tlv,
	0, 7, TLV_DB_SCALE_ITEM(0, 50, 0),
	8, 10, TLV_DB_SCALE_ITEM(400, 100, 0)
);

static const DECLARE_TLV_DB_RANGE(max98371_noload_gain_tlv,
	0, 11, TLV_DB_SCALE_ITEM(950, 100, 0),
);

static const DECLARE_TLV_DB_SCALE(digital_tlv, -6300, 50, 1);

static const struct snd_kcontrol_new max98371_snd_controls[] = {
	SOC_SINGLE_TLV("Speaker Volume", MAX98371_GAIN,
			MAX98371_GAIN_SHIFT, (1<<MAX98371_GAIN_WIDTH)-1, 0,
			max98371_gain_tlv),
	SOC_SINGLE_TLV("Digital Volume", MAX98371_DIGITAL_GAIN, 0,
			(1<<MAX98371_DIGITAL_GAIN_WIDTH)-1, 1, digital_tlv),
	SOC_SINGLE_TLV("Speaker DHT Max Volume", MAX98371_GAIN,
			0, (1<<MAX98371_DHT_MAX_WIDTH)-1, 0,
			max98371_dht_max_gain),
	SOC_SINGLE_TLV("Speaker DHT Min Volume", MAX98371_DHT_GAIN,
			0, (1<<MAX98371_DHT_GAIN_WIDTH)-1, 0,
			max98371_dht_min_gain),
	SOC_SINGLE_TLV("Speaker DHT Rotation Volume", MAX98371_DHT_GAIN,
			0, (1<<MAX98371_DHT_ROT_WIDTH)-1, 0,
			max98371_dht_rot_gain),
	SOC_SINGLE("DHT Attack Step", MAX98371_DHT, MAX98371_DHT_STEP, 3, 0),
	SOC_SINGLE("DHT Attack Rate", MAX98371_DHT, 0, 7, 0),
	SOC_ENUM("Monomix Select", max98371_monomix),
	SOC_ENUM("HPF Cutoff", max98371_hpf_cutoff),
};

static int max98371_dai_set_fmt(struct snd_soc_dai *codec_dai,
		unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct max98371_priv *max98371 = snd_soc_codec_get_drvdata(codec);
	unsigned int val = 0;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		dev_err(codec->dev, "DAI clock mode unsupported");
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		val |= 0;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		val |= MAX98371_DAI_RIGHT;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		val |= MAX98371_DAI_LEFT;
		break;
	default:
		dev_err(codec->dev, "DAI wrong mode unsupported");
		return -EINVAL;
	}
	regmap_update_bits(max98371->regmap, MAX98371_FMT,
			MAX98371_FMT_MODE_MASK, val);
	return 0;
}

static int max98371_dai_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 max98371_priv *max98371 = snd_soc_codec_get_drvdata(codec);
	int blr_clk_ratio, ch_size, channels = params_channels(params);
	int rate = params_rate(params);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		regmap_update_bits(max98371->regmap, MAX98371_FMT,
				MAX98371_FMT_MASK, MAX98371_DAI_CHANSZ_16);
		ch_size = 8;
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		regmap_update_bits(max98371->regmap, MAX98371_FMT,
				MAX98371_FMT_MASK, MAX98371_DAI_CHANSZ_16);
		ch_size = 16;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		regmap_update_bits(max98371->regmap, MAX98371_FMT,
				MAX98371_FMT_MASK, MAX98371_DAI_CHANSZ_32);
		ch_size = 24;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		regmap_update_bits(max98371->regmap, MAX98371_FMT,
				MAX98371_FMT_MASK, MAX98371_DAI_CHANSZ_32);
		ch_size = 32;
		break;
	default:
		return -EINVAL;
	}

	/* BCLK/LRCLK ratio calculation */
	blr_clk_ratio = channels * ch_size;
	switch (blr_clk_ratio) {
	case 32:
		regmap_update_bits(max98371->regmap,
			MAX98371_DAI_CLK,
			MAX98371_DAI_BSEL_MASK, MAX98371_DAI_BSEL_32);
		break;
	case 48:
		regmap_update_bits(max98371->regmap,
			MAX98371_DAI_CLK,
			MAX98371_DAI_BSEL_MASK, MAX98371_DAI_BSEL_48);
		break;
	case 64:
		regmap_update_bits(max98371->regmap,
			MAX98371_DAI_CLK,
			MAX98371_DAI_BSEL_MASK, MAX98371_DAI_BSEL_64);
		break;
	default:
		return -EINVAL;
	}

	switch (rate) {
	case 32000:
		regmap_update_bits(max98371->regmap,
			MAX98371_SPK_SR,
			MAX98371_SPK_SR_MASK, MAX98371_SPK_SR_32);
		break;
	case 44100:
		regmap_update_bits(max98371->regmap,
			MAX98371_SPK_SR,
			MAX98371_SPK_SR_MASK, MAX98371_SPK_SR_44);
		break;
	case 48000:
		regmap_update_bits(max98371->regmap,
			MAX98371_SPK_SR,
			MAX98371_SPK_SR_MASK, MAX98371_SPK_SR_48);
		break;
	case 88200:
		regmap_update_bits(max98371->regmap,
			MAX98371_SPK_SR,
			MAX98371_SPK_SR_MASK, MAX98371_SPK_SR_88);
		break;
	case 96000:
		regmap_update_bits(max98371->regmap,
			MAX98371_SPK_SR,
			MAX98371_SPK_SR_MASK, MAX98371_SPK_SR_96);
		break;
	default:
		return -EINVAL;
	}

	/* enabling both the RX channels*/
	regmap_update_bits(max98371->regmap, MAX98371_MONOMIX_SRC,
			MAX98371_MONOMIX_SRC_MASK, MONOMIX_RX_0_1);
	regmap_update_bits(max98371->regmap, MAX98371_DAI_CHANNEL,
			MAX98371_CHANNEL_MASK, MAX98371_CHANNEL_MASK);
	return 0;
}

static const struct snd_soc_dapm_widget max98371_dapm_widgets[] = {
	SND_SOC_DAPM_DAC("DAC", NULL, MAX98371_SPK_ENABLE, 0, 0),
	SND_SOC_DAPM_SUPPLY("Global Enable", MAX98371_GLOBAL_ENABLE,
		0, 0, NULL, 0),
	SND_SOC_DAPM_OUTPUT("SPK_OUT"),
};

static const struct snd_soc_dapm_route max98371_audio_map[] = {
	{"DAC", NULL, "HiFi Playback"},
	{"SPK_OUT", NULL, "DAC"},
	{"SPK_OUT", NULL, "Global Enable"},
};

#define MAX98371_RATES SNDRV_PCM_RATE_8000_48000
#define MAX98371_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
		SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE)

static const struct snd_soc_dai_ops max98371_dai_ops = {
	.set_fmt = max98371_dai_set_fmt,
	.hw_params = max98371_dai_hw_params,
};

static struct snd_soc_dai_driver max98371_dai[] = {
	{
		.name = "max98371-aif1",
		.playback = {
			.stream_name = "HiFi Playback",
			.channels_min = 1,
			.channels_max = 2,
			.rates = SNDRV_PCM_RATE_8000_48000,
			.formats = MAX98371_FORMATS,
		},
		.ops = &max98371_dai_ops,
	}
};

static const struct snd_soc_codec_driver max98371_codec = {
	.controls = max98371_snd_controls,
	.num_controls = ARRAY_SIZE(max98371_snd_controls),
	.dapm_routes = max98371_audio_map,
	.num_dapm_routes = ARRAY_SIZE(max98371_audio_map),
	.dapm_widgets = max98371_dapm_widgets,
	.num_dapm_widgets = ARRAY_SIZE(max98371_dapm_widgets),
};

static const struct regmap_config max98371_regmap = {
	.reg_bits         = 8,
	.val_bits         = 8,
	.max_register     = MAX98371_VERSION,
	.reg_defaults     = max98371_reg,
	.num_reg_defaults = ARRAY_SIZE(max98371_reg),
	.volatile_reg     = max98371_volatile_register,
	.readable_reg     = max98371_readable_register,
	.cache_type       = REGCACHE_RBTREE,
};

static int max98371_i2c_probe(struct i2c_client *i2c,
		const struct i2c_device_id *id)
{
	struct max98371_priv *max98371;
	int ret, reg;

	max98371 = devm_kzalloc(&i2c->dev,
			sizeof(*max98371), GFP_KERNEL);
	if (!max98371)
		return -ENOMEM;

	i2c_set_clientdata(i2c, max98371);
	max98371->regmap = devm_regmap_init_i2c(i2c, &max98371_regmap);
	if (IS_ERR(max98371->regmap)) {
		ret = PTR_ERR(max98371->regmap);
		dev_err(&i2c->dev,
				"Failed to allocate regmap: %d\n", ret);
		return ret;
	}

	ret = regmap_read(max98371->regmap, MAX98371_VERSION, &reg);
	if (ret < 0) {
		dev_info(&i2c->dev, "device error %d\n", ret);
		return ret;
	}
	dev_info(&i2c->dev, "device version %x\n", reg);

	ret = snd_soc_register_codec(&i2c->dev, &max98371_codec,
			max98371_dai, ARRAY_SIZE(max98371_dai));
	if (ret < 0) {
		dev_err(&i2c->dev, "Failed to register codec: %d\n", ret);
		return ret;
	}
	return ret;
}

static int max98371_i2c_remove(struct i2c_client *client)
{
	snd_soc_unregister_codec(&client->dev);
	return 0;
}

static const struct i2c_device_id max98371_i2c_id[] = {
	{ "max98371", 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, max98371_i2c_id);

static const struct of_device_id max98371_of_match[] = {
	{ .compatible = "maxim,max98371", },
	{ }
};
MODULE_DEVICE_TABLE(of, max98371_of_match);

static struct i2c_driver max98371_i2c_driver = {
	.driver = {
		.name = "max98371",
		.owner = THIS_MODULE,
		.pm = NULL,
		.of_match_table = of_match_ptr(max98371_of_match),
	},
	.probe  = max98371_i2c_probe,
	.remove = max98371_i2c_remove,
	.id_table = max98371_i2c_id,
};

module_i2c_driver(max98371_i2c_driver);

MODULE_AUTHOR("anish kumar <yesanishhere@gmail.com>");
MODULE_DESCRIPTION("ALSA SoC MAX98371 driver");
MODULE_LICENSE("GPL");