// SPDX-License-Identifier: GPL-2.0
//
// Driver for the Texas Instruments TAS2562 CODEC
// Copyright (C) 2019 Texas Instruments Inc.


#include <linux/module.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>

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

#include "tas2562.h"

#define TAS2562_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE |\
			 SNDRV_PCM_FORMAT_S32_LE)

struct tas2562_data {
	struct snd_soc_component *component;
	struct gpio_desc *sdz_gpio;
	struct regmap *regmap;
	struct device *dev;
	struct i2c_client *client;
	int v_sense_slot;
	int i_sense_slot;
};

static int tas2562_set_bias_level(struct snd_soc_component *component,
				 enum snd_soc_bias_level level)
{
	struct tas2562_data *tas2562 =
			snd_soc_component_get_drvdata(component);

	switch (level) {
	case SND_SOC_BIAS_ON:
		snd_soc_component_update_bits(component,
			TAS2562_PWR_CTRL,
			TAS2562_MODE_MASK, TAS2562_ACTIVE);
		break;
	case SND_SOC_BIAS_STANDBY:
	case SND_SOC_BIAS_PREPARE:
		snd_soc_component_update_bits(component,
			TAS2562_PWR_CTRL,
			TAS2562_MODE_MASK, TAS2562_MUTE);
		break;
	case SND_SOC_BIAS_OFF:
		snd_soc_component_update_bits(component,
			TAS2562_PWR_CTRL,
			TAS2562_MODE_MASK, TAS2562_SHUTDOWN);
		break;

	default:
		dev_err(tas2562->dev,
				"wrong power level setting %d\n", level);
		return -EINVAL;
	}

	return 0;
}

static int tas2562_set_samplerate(struct tas2562_data *tas2562, int samplerate)
{
	int samp_rate;
	int ramp_rate;

	switch (samplerate) {
	case 7350:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_7305_8KHZ;
		break;
	case 8000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_7305_8KHZ;
		break;
	case 14700:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_14_7_16KHZ;
		break;
	case 16000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_14_7_16KHZ;
		break;
	case 22050:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_22_05_24KHZ;
		break;
	case 24000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_22_05_24KHZ;
		break;
	case 29400:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_29_4_32KHZ;
		break;
	case 32000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_29_4_32KHZ;
		break;
	case 44100:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_44_1_48KHZ;
		break;
	case 48000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_44_1_48KHZ;
		break;
	case 88200:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_88_2_96KHZ;
		break;
	case 96000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_88_2_96KHZ;
		break;
	case 176400:
		ramp_rate = TAS2562_TDM_CFG0_RAMPRATE_44_1;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_176_4_192KHZ;
		break;
	case 192000:
		ramp_rate = 0;
		samp_rate = TAS2562_TDM_CFG0_SAMPRATE_176_4_192KHZ;
		break;
	default:
		dev_info(tas2562->dev, "%s, unsupported sample rate, %d\n",
			__func__, samplerate);
		return -EINVAL;
	}

	snd_soc_component_update_bits(tas2562->component, TAS2562_TDM_CFG0,
		TAS2562_TDM_CFG0_RAMPRATE_MASK,	ramp_rate);
	snd_soc_component_update_bits(tas2562->component, TAS2562_TDM_CFG0,
		TAS2562_TDM_CFG0_SAMPRATE_MASK,	samp_rate);

	return 0;
}

static int tas2562_set_dai_tdm_slot(struct snd_soc_dai *dai,
		unsigned int tx_mask, unsigned int rx_mask,
		int slots, int slot_width)
{
	struct snd_soc_component *component = dai->component;
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);
	int ret = 0;

	switch (slot_width) {
	case 16:
		ret = snd_soc_component_update_bits(component,
						    TAS2562_TDM_CFG2,
						    TAS2562_TDM_CFG2_RXLEN_MASK,
						    TAS2562_TDM_CFG2_RXLEN_16B);
		break;
	case 24:
		ret = snd_soc_component_update_bits(component,
						    TAS2562_TDM_CFG2,
						    TAS2562_TDM_CFG2_RXLEN_MASK,
						    TAS2562_TDM_CFG2_RXLEN_24B);
		break;
	case 32:
		ret = snd_soc_component_update_bits(component,
						    TAS2562_TDM_CFG2,
						    TAS2562_TDM_CFG2_RXLEN_MASK,
						    TAS2562_TDM_CFG2_RXLEN_32B);
		break;

	case 0:
		/* Do not change slot width */
		break;
	default:
		dev_err(tas2562->dev, "slot width not supported");
		ret = -EINVAL;
	}

	if (ret < 0)
		return ret;

	return 0;
}

static int tas2562_set_bitwidth(struct tas2562_data *tas2562, int bitwidth)
{
	int ret;

	switch (bitwidth) {
	case SNDRV_PCM_FORMAT_S16_LE:
		snd_soc_component_update_bits(tas2562->component,
					      TAS2562_TDM_CFG2,
					      TAS2562_TDM_CFG2_RXWLEN_MASK,
					      TAS2562_TDM_CFG2_RXWLEN_16B);
		tas2562->v_sense_slot = tas2562->i_sense_slot + 2;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		snd_soc_component_update_bits(tas2562->component,
					      TAS2562_TDM_CFG2,
					      TAS2562_TDM_CFG2_RXWLEN_MASK,
					      TAS2562_TDM_CFG2_RXWLEN_24B);
		tas2562->v_sense_slot = tas2562->i_sense_slot + 4;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		snd_soc_component_update_bits(tas2562->component,
					      TAS2562_TDM_CFG2,
					      TAS2562_TDM_CFG2_RXWLEN_MASK,
					      TAS2562_TDM_CFG2_RXWLEN_32B);
		tas2562->v_sense_slot = tas2562->i_sense_slot + 4;
		break;

	default:
		dev_info(tas2562->dev, "Unsupported bitwidth format\n");
		return -EINVAL;
	}

	ret = snd_soc_component_update_bits(tas2562->component,
		TAS2562_TDM_CFG5,
		TAS2562_TDM_CFG5_VSNS_EN | TAS2562_TDM_CFG5_VSNS_SLOT_MASK,
		TAS2562_TDM_CFG5_VSNS_EN | tas2562->v_sense_slot);
	if (ret < 0)
		return ret;

	ret = snd_soc_component_update_bits(tas2562->component,
		TAS2562_TDM_CFG6,
		TAS2562_TDM_CFG6_ISNS_EN | TAS2562_TDM_CFG6_ISNS_SLOT_MASK,
		TAS2562_TDM_CFG6_ISNS_EN | tas2562->i_sense_slot);
	if (ret < 0)
		return ret;

	return 0;
}

static int tas2562_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params,
			     struct snd_soc_dai *dai)
{
	struct snd_soc_component *component = dai->component;
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);
	int ret;

	ret = tas2562_set_bitwidth(tas2562, params_format(params));
	if (ret) {
		dev_err(tas2562->dev, "set bitwidth failed, %d\n", ret);
		return ret;
	}

	ret = tas2562_set_samplerate(tas2562, params_rate(params));
	if (ret)
		dev_err(tas2562->dev, "set sample rate failed, %d\n", ret);

	return ret;
}

static int tas2562_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct snd_soc_component *component = dai->component;
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);
	u8 tdm_rx_start_slot = 0, asi_cfg_1 = 0;
	int ret;

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		asi_cfg_1 = 0;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		asi_cfg_1 |= TAS2562_TDM_CFG1_RX_FALLING;
		break;
	default:
		dev_err(tas2562->dev, "ASI format Inverse is not found\n");
		return -EINVAL;
	}

	ret = snd_soc_component_update_bits(component, TAS2562_TDM_CFG1,
					    TAS2562_TDM_CFG1_RX_EDGE_MASK,
					    asi_cfg_1);
	if (ret < 0) {
		dev_err(tas2562->dev, "Failed to set RX edge\n");
		return ret;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case (SND_SOC_DAIFMT_I2S):
	case (SND_SOC_DAIFMT_DSP_A):
	case (SND_SOC_DAIFMT_DSP_B):
		tdm_rx_start_slot = BIT(1);
		break;
	case (SND_SOC_DAIFMT_LEFT_J):
		tdm_rx_start_slot = 0;
		break;
	default:
		dev_err(tas2562->dev, "DAI Format is not found, fmt=0x%x\n",
			fmt);
		ret = -EINVAL;
		break;
	}

	ret = snd_soc_component_update_bits(component, TAS2562_TDM_CFG1,
					    TAS2562_TDM_CFG1_RX_OFFSET_MASK,
					    tdm_rx_start_slot);

	if (ret < 0)
		return ret;

	return 0;
}

static int tas2562_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_component *component = dai->component;

	return snd_soc_component_update_bits(component, TAS2562_PWR_CTRL,
					     TAS2562_MODE_MASK,
					     mute ? TAS2562_MUTE : 0);
}

static int tas2562_codec_probe(struct snd_soc_component *component)
{
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);
	int ret;

	tas2562->component = component;

	if (tas2562->sdz_gpio)
		gpiod_set_value_cansleep(tas2562->sdz_gpio, 1);

	ret = snd_soc_component_update_bits(component, TAS2562_PWR_CTRL,
					    TAS2562_MODE_MASK, TAS2562_MUTE);
	if (ret < 0)
		return ret;

	return 0;
}

#ifdef CONFIG_PM
static int tas2562_suspend(struct snd_soc_component *component)
{
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);

	regcache_cache_only(tas2562->regmap, true);
	regcache_mark_dirty(tas2562->regmap);

	if (tas2562->sdz_gpio)
		gpiod_set_value_cansleep(tas2562->sdz_gpio, 0);

	return 0;
}

static int tas2562_resume(struct snd_soc_component *component)
{
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);

	if (tas2562->sdz_gpio)
		gpiod_set_value_cansleep(tas2562->sdz_gpio, 1);

	regcache_cache_only(tas2562->regmap, false);

	return regcache_sync(tas2562->regmap);
}
#else
#define tas2562_suspend NULL
#define tas2562_resume NULL
#endif

static const char * const tas2562_ASI1_src[] = {
	"I2C offset", "Left", "Right", "LeftRightDiv2",
};

static SOC_ENUM_SINGLE_DECL(tas2562_ASI1_src_enum, TAS2562_TDM_CFG2, 4,
			    tas2562_ASI1_src);

static const struct snd_kcontrol_new tas2562_asi1_mux =
	SOC_DAPM_ENUM("ASI1 Source", tas2562_ASI1_src_enum);

static int tas2562_dac_event(struct snd_soc_dapm_widget *w,
			     struct snd_kcontrol *kcontrol, int event)
{
	struct snd_soc_component *component =
					snd_soc_dapm_to_component(w->dapm);
	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);

	switch (event) {
	case SND_SOC_DAPM_POST_PMU:
		dev_info(tas2562->dev, "SND_SOC_DAPM_POST_PMU\n");
		break;
	case SND_SOC_DAPM_PRE_PMD:
		dev_info(tas2562->dev, "SND_SOC_DAPM_PRE_PMD\n");
		break;
	default:
		break;
	}

	return 0;
}

static DECLARE_TLV_DB_SCALE(tas2562_dac_tlv, 850, 50, 0);

static const struct snd_kcontrol_new isense_switch =
	SOC_DAPM_SINGLE("Switch", TAS2562_PWR_CTRL, TAS2562_ISENSE_POWER_EN,
			1, 1);

static const struct snd_kcontrol_new vsense_switch =
	SOC_DAPM_SINGLE("Switch", TAS2562_PWR_CTRL, TAS2562_VSENSE_POWER_EN,
			1, 1);

static const struct snd_kcontrol_new tas2562_snd_controls[] = {
	SOC_SINGLE_TLV("Amp Gain Volume", TAS2562_PB_CFG1, 1, 0x1c, 0,
		       tas2562_dac_tlv),
};

static const struct snd_soc_dapm_widget tas2562_dapm_widgets[] = {
	SND_SOC_DAPM_AIF_IN("ASI1", "ASI1 Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_MUX("ASI1 Sel", SND_SOC_NOPM, 0, 0, &tas2562_asi1_mux),
	SND_SOC_DAPM_AIF_IN("DAC IN", "Playback", 0, SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC_E("DAC", NULL, SND_SOC_NOPM, 0, 0, tas2562_dac_event,
			   SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
	SND_SOC_DAPM_SWITCH("ISENSE", TAS2562_PWR_CTRL, 3, 1, &isense_switch),
	SND_SOC_DAPM_SWITCH("VSENSE", TAS2562_PWR_CTRL, 2, 1, &vsense_switch),
	SND_SOC_DAPM_SIGGEN("VMON"),
	SND_SOC_DAPM_SIGGEN("IMON"),
	SND_SOC_DAPM_OUTPUT("OUT"),
};

static const struct snd_soc_dapm_route tas2562_audio_map[] = {
	{"ASI1 Sel", "I2C offset", "ASI1"},
	{"ASI1 Sel", "Left", "ASI1"},
	{"ASI1 Sel", "Right", "ASI1"},
	{"ASI1 Sel", "LeftRightDiv2", "ASI1"},
	{ "DAC", NULL, "DAC IN" },
	{ "OUT", NULL, "DAC" },
	{"ISENSE", "Switch", "IMON"},
	{"VSENSE", "Switch", "VMON"},
};

static const struct snd_soc_component_driver soc_component_dev_tas2562 = {
	.probe			= tas2562_codec_probe,
	.suspend		= tas2562_suspend,
	.resume			= tas2562_resume,
	.set_bias_level		= tas2562_set_bias_level,
	.controls		= tas2562_snd_controls,
	.num_controls		= ARRAY_SIZE(tas2562_snd_controls),
	.dapm_widgets		= tas2562_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(tas2562_dapm_widgets),
	.dapm_routes		= tas2562_audio_map,
	.num_dapm_routes	= ARRAY_SIZE(tas2562_audio_map),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

static const struct snd_soc_dai_ops tas2562_speaker_dai_ops = {
	.hw_params	= tas2562_hw_params,
	.set_fmt	= tas2562_set_dai_fmt,
	.set_tdm_slot	= tas2562_set_dai_tdm_slot,
	.digital_mute	= tas2562_mute,
};

static struct snd_soc_dai_driver tas2562_dai[] = {
	{
		.name = "tas2562-amplifier",
		.id = 0,
		.playback = {
			.stream_name    = "ASI1 Playback",
			.channels_min   = 2,
			.channels_max   = 2,
			.rates      = SNDRV_PCM_RATE_8000_192000,
			.formats    = TAS2562_FORMATS,
		},
		.ops = &tas2562_speaker_dai_ops,
	},
};

static const struct regmap_range_cfg tas2562_ranges[] = {
	{
		.range_min = 0,
		.range_max = 5 * 128,
		.selector_reg = TAS2562_PAGE_CTRL,
		.selector_mask = 0xff,
		.selector_shift = 0,
		.window_start = 0,
		.window_len = 128,
	},
};

static const struct reg_default tas2562_reg_defaults[] = {
	{ TAS2562_PAGE_CTRL, 0x00 },
	{ TAS2562_SW_RESET, 0x00 },
	{ TAS2562_PWR_CTRL, 0x0e },
	{ TAS2562_PB_CFG1, 0x20 },
	{ TAS2562_TDM_CFG0, 0x09 },
	{ TAS2562_TDM_CFG1, 0x02 },
};

static const struct regmap_config tas2562_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = 5 * 128,
	.cache_type = REGCACHE_RBTREE,
	.reg_defaults = tas2562_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(tas2562_reg_defaults),
	.ranges = tas2562_ranges,
	.num_ranges = ARRAY_SIZE(tas2562_ranges),
};

static int tas2562_parse_dt(struct tas2562_data *tas2562)
{
	struct device *dev = tas2562->dev;
	int ret = 0;

	tas2562->sdz_gpio = devm_gpiod_get_optional(dev, "shut-down-gpio",
						      GPIOD_OUT_HIGH);
	if (IS_ERR(tas2562->sdz_gpio)) {
		if (PTR_ERR(tas2562->sdz_gpio) == -EPROBE_DEFER) {
			tas2562->sdz_gpio = NULL;
			return -EPROBE_DEFER;
		}
	}

	ret = fwnode_property_read_u32(dev->fwnode, "ti,imon-slot-no",
			&tas2562->i_sense_slot);
	if (ret)
		dev_err(dev, "Looking up %s property failed %d\n",
			"ti,imon-slot-no", ret);

	return ret;
}

static int tas2562_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct tas2562_data *data;
	int ret;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	data->dev = &client->dev;

	tas2562_parse_dt(data);

	data->regmap = devm_regmap_init_i2c(client, &tas2562_regmap_config);
	if (IS_ERR(data->regmap)) {
		ret = PTR_ERR(data->regmap);
		dev_err(dev, "failed to allocate register map: %d\n", ret);
		return ret;
	}

	dev_set_drvdata(&client->dev, data);

	return devm_snd_soc_register_component(dev, &soc_component_dev_tas2562,
					       tas2562_dai,
					       ARRAY_SIZE(tas2562_dai));

}

static const struct i2c_device_id tas2562_id[] = {
	{ "tas2562", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, tas2562_id);

static const struct of_device_id tas2562_of_match[] = {
	{ .compatible = "ti,tas2562", },
	{ },
};
MODULE_DEVICE_TABLE(of, tas2562_of_match);

static struct i2c_driver tas2562_i2c_driver = {
	.driver = {
		.name = "tas2562",
		.of_match_table = of_match_ptr(tas2562_of_match),
	},
	.probe = tas2562_probe,
	.id_table = tas2562_id,
};

module_i2c_driver(tas2562_i2c_driver);

MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");
MODULE_DESCRIPTION("TAS2562 Audio amplifier driver");
MODULE_LICENSE("GPL");