// SPDX-License-Identifier: GPL-2.0
//
// IDT821034 ALSA SoC driver
//
// Copyright 2022 CS GROUP France
//
// Author: Herve Codina <herve.codina@bootlin.com>

#include <linux/bitrev.h>
#include <linux/gpio/driver.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/tlv.h>

#define IDT821034_NB_CHANNEL	4

struct idt821034_amp {
	u16 gain;
	bool is_muted;
};

struct idt821034 {
	struct spi_device *spi;
	struct mutex mutex;
	u8 spi_tx_buf; /* Cannot use stack area for SPI (dma-safe memory) */
	u8 spi_rx_buf; /* Cannot use stack area for SPI (dma-safe memory) */
	struct {
		u8 codec_conf;
		struct {
			u8 power;
			u8 tx_slot;
			u8 rx_slot;
			u8 slic_conf;
			u8 slic_control;
		} ch[IDT821034_NB_CHANNEL];
	} cache;
	struct {
		struct {
			struct idt821034_amp amp_out;
			struct idt821034_amp amp_in;
		} ch[IDT821034_NB_CHANNEL];
	} amps;
	int max_ch_playback;
	int max_ch_capture;
	struct gpio_chip gpio_chip;
};

static int idt821034_8bit_write(struct idt821034 *idt821034, u8 val)
{
	struct spi_transfer xfer[] = {
		{
			.tx_buf = &idt821034->spi_tx_buf,
			.len = 1,
		}, {
			.cs_off = 1,
			.tx_buf = &idt821034->spi_tx_buf,
			.len = 1,
		}
	};

	idt821034->spi_tx_buf = val;

	dev_vdbg(&idt821034->spi->dev, "spi xfer wr 0x%x\n", val);

	return spi_sync_transfer(idt821034->spi, xfer, 2);
}

static int idt821034_2x8bit_write(struct idt821034 *idt821034, u8 val1, u8 val2)
{
	int ret;

	ret = idt821034_8bit_write(idt821034, val1);
	if (ret)
		return ret;
	return idt821034_8bit_write(idt821034, val2);
}

static int idt821034_8bit_read(struct idt821034 *idt821034, u8 valw, u8 *valr)
{
	struct spi_transfer xfer[] = {
		{
			.tx_buf = &idt821034->spi_tx_buf,
			.rx_buf = &idt821034->spi_rx_buf,
			.len = 1,
		}, {
			.cs_off = 1,
			.tx_buf = &idt821034->spi_tx_buf,
			.len = 1,
		}
	};
	int ret;

	idt821034->spi_tx_buf = valw;

	ret = spi_sync_transfer(idt821034->spi, xfer, 2);
	if (ret)
		return ret;

	*valr = idt821034->spi_rx_buf;

	dev_vdbg(&idt821034->spi->dev, "spi xfer wr 0x%x, rd 0x%x\n",
		 valw, *valr);

	return 0;
}

/* Available mode for the programming sequence */
#define IDT821034_MODE_CODEC(_ch) (0x80 | ((_ch) << 2))
#define IDT821034_MODE_SLIC(_ch)  (0xD0 | ((_ch) << 2))
#define IDT821034_MODE_GAIN(_ch)  (0xC0 | ((_ch) << 2))

/* Power values that can be used in 'power' (can be ORed) */
#define IDT821034_CONF_PWRUP_TX		BIT(1) /* from analog input to PCM */
#define IDT821034_CONF_PWRUP_RX		BIT(0) /* from PCM to analog output */

static int idt821034_set_channel_power(struct idt821034 *idt821034, u8 ch, u8 power)
{
	u8 conf;
	int ret;

	dev_dbg(&idt821034->spi->dev, "set_channel_power(%u, 0x%x)\n", ch, power);

	conf = IDT821034_MODE_CODEC(ch) | idt821034->cache.codec_conf;

	if (power & IDT821034_CONF_PWRUP_RX) {
		ret = idt821034_2x8bit_write(idt821034,
					     conf | IDT821034_CONF_PWRUP_RX,
					     idt821034->cache.ch[ch].rx_slot);
		if (ret)
			return ret;
	}
	if (power & IDT821034_CONF_PWRUP_TX) {
		ret = idt821034_2x8bit_write(idt821034,
					     conf | IDT821034_CONF_PWRUP_TX,
					     idt821034->cache.ch[ch].tx_slot);
		if (ret)
			return ret;
	}
	if (!(power & (IDT821034_CONF_PWRUP_TX | IDT821034_CONF_PWRUP_RX))) {
		ret = idt821034_2x8bit_write(idt821034, conf, 0);
		if (ret)
			return ret;
	}

	idt821034->cache.ch[ch].power = power;

	return 0;
}

static u8 idt821034_get_channel_power(struct idt821034 *idt821034, u8 ch)
{
	return idt821034->cache.ch[ch].power;
}

/* Codec configuration values that can be used in 'codec_conf' (can be ORed) */
#define IDT821034_CONF_ALAW_MODE	BIT(5)
#define IDT821034_CONF_DELAY_MODE	BIT(4)

static int idt821034_set_codec_conf(struct idt821034 *idt821034, u8 codec_conf)
{
	u8 conf;
	u8 ts;
	int ret;

	dev_dbg(&idt821034->spi->dev, "set_codec_conf(0x%x)\n", codec_conf);

	/* codec conf fields are common to all channel.
	 * Arbitrary use of channel 0 for this configuration.
	 */

	/* Set Configuration Register */
	conf = IDT821034_MODE_CODEC(0) | codec_conf;

	/* Update conf value and timeslot register value according
	 * to cache values
	 */
	if (idt821034->cache.ch[0].power & IDT821034_CONF_PWRUP_RX) {
		conf |= IDT821034_CONF_PWRUP_RX;
		ts = idt821034->cache.ch[0].rx_slot;
	} else if (idt821034->cache.ch[0].power & IDT821034_CONF_PWRUP_TX) {
		conf |= IDT821034_CONF_PWRUP_TX;
		ts = idt821034->cache.ch[0].tx_slot;
	} else {
		ts = 0x00;
	}

	/* Write configuration register and time-slot register */
	ret = idt821034_2x8bit_write(idt821034, conf, ts);
	if (ret)
		return ret;

	idt821034->cache.codec_conf = codec_conf;
	return 0;
}

static u8 idt821034_get_codec_conf(struct idt821034 *idt821034)
{
	return idt821034->cache.codec_conf;
}

/* Channel direction values that can be used in 'ch_dir' (can be ORed) */
#define IDT821034_CH_RX		BIT(0) /* from PCM to analog output */
#define IDT821034_CH_TX		BIT(1) /* from analog input to PCM */

static int idt821034_set_channel_ts(struct idt821034 *idt821034, u8 ch, u8 ch_dir, u8 ts_num)
{
	u8 conf;
	int ret;

	dev_dbg(&idt821034->spi->dev, "set_channel_ts(%u, 0x%x, %d)\n", ch, ch_dir, ts_num);

	conf = IDT821034_MODE_CODEC(ch) | idt821034->cache.codec_conf;

	if (ch_dir & IDT821034_CH_RX) {
		if (idt821034->cache.ch[ch].power & IDT821034_CONF_PWRUP_RX) {
			ret = idt821034_2x8bit_write(idt821034,
						     conf | IDT821034_CONF_PWRUP_RX,
						     ts_num);
			if (ret)
				return ret;
		}
		idt821034->cache.ch[ch].rx_slot = ts_num;
	}
	if (ch_dir & IDT821034_CH_TX) {
		if (idt821034->cache.ch[ch].power & IDT821034_CONF_PWRUP_TX) {
			ret = idt821034_2x8bit_write(idt821034,
						     conf | IDT821034_CONF_PWRUP_TX,
						     ts_num);
			if (ret)
				return ret;
		}
		idt821034->cache.ch[ch].tx_slot = ts_num;
	}

	return 0;
}

/* SLIC direction values that can be used in 'slic_dir' (can be ORed) */
#define IDT821034_SLIC_IO1_IN       BIT(1)
#define IDT821034_SLIC_IO0_IN       BIT(0)

static int idt821034_set_slic_conf(struct idt821034 *idt821034, u8 ch, u8 slic_dir)
{
	u8 conf;
	int ret;

	dev_dbg(&idt821034->spi->dev, "set_slic_conf(%u, 0x%x)\n", ch, slic_dir);

	conf = IDT821034_MODE_SLIC(ch) | slic_dir;
	ret = idt821034_2x8bit_write(idt821034, conf, idt821034->cache.ch[ch].slic_control);
	if (ret)
		return ret;

	idt821034->cache.ch[ch].slic_conf = slic_dir;

	return 0;
}

static u8 idt821034_get_slic_conf(struct idt821034 *idt821034, u8 ch)
{
	return idt821034->cache.ch[ch].slic_conf;
}

static int idt821034_write_slic_raw(struct idt821034 *idt821034, u8 ch, u8 slic_raw)
{
	u8 conf;
	int ret;

	dev_dbg(&idt821034->spi->dev, "write_slic_raw(%u, 0x%x)\n", ch, slic_raw);

	/*
	 * On write, slic_raw is mapped as follow :
	 *   b4: O_4
	 *   b3: O_3
	 *   b2: O_2
	 *   b1: I/O_1
	 *   b0: I/O_0
	 */

	conf = IDT821034_MODE_SLIC(ch) | idt821034->cache.ch[ch].slic_conf;
	ret = idt821034_2x8bit_write(idt821034, conf, slic_raw);
	if (ret)
		return ret;

	idt821034->cache.ch[ch].slic_control = slic_raw;
	return 0;
}

static u8 idt821034_get_written_slic_raw(struct idt821034 *idt821034, u8 ch)
{
	return idt821034->cache.ch[ch].slic_control;
}

static int idt821034_read_slic_raw(struct idt821034 *idt821034, u8 ch, u8 *slic_raw)
{
	u8 val;
	int ret;

	/*
	 * On read, slic_raw is mapped as follow :
	 *   b7: I/O_0
	 *   b6: I/O_1
	 *   b5: O_2
	 *   b4: O_3
	 *   b3: O_4
	 *   b2: I/O1_0, I/O_0 from channel 1 (no matter ch value)
	 *   b1: I/O2_0, I/O_0 from channel 2 (no matter ch value)
	 *   b2: I/O3_0, I/O_0 from channel 3 (no matter ch value)
	 */

	val = IDT821034_MODE_SLIC(ch) | idt821034->cache.ch[ch].slic_conf;
	ret = idt821034_8bit_write(idt821034, val);
	if (ret)
		return ret;

	ret = idt821034_8bit_read(idt821034, idt821034->cache.ch[ch].slic_control, slic_raw);
	if (ret)
		return ret;

	dev_dbg(&idt821034->spi->dev, "read_slic_raw(%i) 0x%x\n", ch, *slic_raw);

	return 0;
}

/* Gain type values that can be used in 'gain_type' (cannot be ORed) */
#define IDT821034_GAIN_RX		(0 << 1) /* from PCM to analog output */
#define IDT821034_GAIN_TX		(1 << 1) /* from analog input to PCM */

static int idt821034_set_gain_channel(struct idt821034 *idt821034, u8 ch,
				      u8 gain_type, u16 gain_val)
{
	u8 conf;
	int ret;

	dev_dbg(&idt821034->spi->dev, "set_gain_channel(%u, 0x%x, 0x%x-%d)\n",
		ch, gain_type, gain_val, gain_val);

	/*
	 * The gain programming coefficients should be calculated as:
	 *   Transmit : Coeff_X = round [ gain_X0dB × gain_X ]
	 *   Receive: Coeff_R = round [ gain_R0dB × gain_R ]
	 * where:
	 *   gain_X0dB = 1820;
	 *   gain_X is the target gain;
	 *   Coeff_X should be in the range of 0 to 8192.
	 *   gain_R0dB = 2506;
	 *   gain_R is the target gain;
	 *   Coeff_R should be in the range of 0 to 8192.
	 *
	 * A gain programming coefficient is 14-bit wide and in binary format.
	 * The 7 Most Significant Bits of the coefficient is called
	 * GA_MSB_Transmit for transmit path, or is called GA_MSB_Receive for
	 * receive path; The 7 Least Significant Bits of the coefficient is
	 * called GA_LSB_ Transmit for transmit path, or is called
	 * GA_LSB_Receive for receive path.
	 *
	 * An example is given below to clarify the calculation of the
	 * coefficient. To program a +3 dB gain in transmit path and a -3.5 dB
	 * gain in receive path:
	 *
	 * Linear Code of +3dB = 10^(3/20)= 1.412537545
	 * Coeff_X = round (1820 × 1.412537545) = 2571
	 *                                      = 0b001010_00001011
	 * GA_MSB_Transmit = 0b0010100
	 * GA_LSB_Transmit = 0b0001011
	 *
	 * Linear Code of -3.5dB = 10^(-3.5/20) = 0.668343917
	 * Coeff_R= round (2506 × 0.668343917) = 1675
	 *                                     = 0b0001101_0001011
	 * GA_MSB_Receive = 0b0001101
	 * GA_LSB_Receive = 0b0001011
	 */

	conf = IDT821034_MODE_GAIN(ch) | gain_type;

	ret = idt821034_2x8bit_write(idt821034, conf | 0x00, gain_val & 0x007F);
	if (ret)
		return ret;

	ret = idt821034_2x8bit_write(idt821034, conf | 0x01, (gain_val >> 7) & 0x7F);
	if (ret)
		return ret;

	return 0;
}

/* Id helpers used in controls and dapm */
#define IDT821034_DIR_OUT (1 << 3)
#define IDT821034_DIR_IN  (0 << 3)
#define IDT821034_ID(_ch, _dir) (((_ch) & 0x03) | (_dir))
#define IDT821034_ID_OUT(_ch) IDT821034_ID(_ch, IDT821034_DIR_OUT)
#define IDT821034_ID_IN(_ch)  IDT821034_ID(_ch, IDT821034_DIR_IN)

#define IDT821034_ID_GET_CHAN(_id) ((_id) & 0x03)
#define IDT821034_ID_GET_DIR(_id) ((_id) & (1 << 3))
#define IDT821034_ID_IS_OUT(_id) (IDT821034_ID_GET_DIR(_id) == IDT821034_DIR_OUT)

static int idt821034_kctrl_gain_get(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc = (struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
	int min = mc->min;
	int max = mc->max;
	unsigned int mask = (1 << fls(max)) - 1;
	unsigned int invert = mc->invert;
	int val;
	u8 ch;

	ch = IDT821034_ID_GET_CHAN(mc->reg);

	mutex_lock(&idt821034->mutex);
	if (IDT821034_ID_IS_OUT(mc->reg))
		val = idt821034->amps.ch[ch].amp_out.gain;
	else
		val = idt821034->amps.ch[ch].amp_in.gain;
	mutex_unlock(&idt821034->mutex);

	ucontrol->value.integer.value[0] = val & mask;
	if (invert)
		ucontrol->value.integer.value[0] = max - ucontrol->value.integer.value[0];
	else
		ucontrol->value.integer.value[0] = ucontrol->value.integer.value[0] - min;

	return 0;
}

static int idt821034_kctrl_gain_put(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc = (struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
	struct idt821034_amp *amp;
	int min = mc->min;
	int max = mc->max;
	unsigned int mask = (1 << fls(max)) - 1;
	unsigned int invert = mc->invert;
	unsigned int val;
	int ret;
	u8 gain_type;
	u8 ch;

	val = ucontrol->value.integer.value[0];
	if (val > max - min)
		return -EINVAL;

	if (invert)
		val = (max - val) & mask;
	else
		val = (val + min) & mask;

	ch = IDT821034_ID_GET_CHAN(mc->reg);

	mutex_lock(&idt821034->mutex);

	if (IDT821034_ID_IS_OUT(mc->reg)) {
		amp = &idt821034->amps.ch[ch].amp_out;
		gain_type = IDT821034_GAIN_RX;
	} else {
		amp = &idt821034->amps.ch[ch].amp_in;
		gain_type = IDT821034_GAIN_TX;
	}

	if (amp->gain == val) {
		ret = 0;
		goto end;
	}

	if (!amp->is_muted) {
		ret = idt821034_set_gain_channel(idt821034, ch, gain_type, val);
		if (ret)
			goto end;
	}

	amp->gain = val;
	ret = 1; /* The value changed */
end:
	mutex_unlock(&idt821034->mutex);
	return ret;
}

static int idt821034_kctrl_mute_get(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
	int id = kcontrol->private_value;
	bool is_muted;
	u8 ch;

	ch = IDT821034_ID_GET_CHAN(id);

	mutex_lock(&idt821034->mutex);
	is_muted = IDT821034_ID_IS_OUT(id) ?
			idt821034->amps.ch[ch].amp_out.is_muted :
			idt821034->amps.ch[ch].amp_in.is_muted;
	mutex_unlock(&idt821034->mutex);

	ucontrol->value.integer.value[0] = !is_muted;

	return 0;
}

static int idt821034_kctrl_mute_put(struct snd_kcontrol *kcontrol,
				    struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
	int id = kcontrol->private_value;
	struct idt821034_amp *amp;
	bool is_mute;
	u8 gain_type;
	int ret;
	u8 ch;

	ch = IDT821034_ID_GET_CHAN(id);
	is_mute = !ucontrol->value.integer.value[0];

	mutex_lock(&idt821034->mutex);

	if (IDT821034_ID_IS_OUT(id)) {
		amp = &idt821034->amps.ch[ch].amp_out;
		gain_type = IDT821034_GAIN_RX;
	} else {
		amp = &idt821034->amps.ch[ch].amp_in;
		gain_type = IDT821034_GAIN_TX;
	}

	if (amp->is_muted == is_mute) {
		ret = 0;
		goto end;
	}

	ret = idt821034_set_gain_channel(idt821034, ch, gain_type,
					 is_mute ? 0 : amp->gain);
	if (ret)
		goto end;

	amp->is_muted = is_mute;
	ret = 1; /* The value changed */
end:
	mutex_unlock(&idt821034->mutex);
	return ret;
}

static const DECLARE_TLV_DB_LINEAR(idt821034_gain_in, -300, 1300);
#define IDT821034_GAIN_IN_MIN_RAW	1288 /* -3.0 dB -> 10^(-3.0/20.0) * 1820 = 1288 */
#define IDT821034_GAIN_IN_MAX_RAW	8130 /* 13.0 dB -> 10^(13.0/20.0) * 1820 = 8130 */
#define IDT821034_GAIN_IN_INIT_RAW	1820 /* 0dB -> 10^(0/20) * 1820 = 1820 */

static const DECLARE_TLV_DB_LINEAR(idt821034_gain_out, -1300, 300);
#define IDT821034_GAIN_OUT_MIN_RAW	561 /* -13.0 dB -> 10^(-13.0/20.0) * 2506 = 561 */
#define IDT821034_GAIN_OUT_MAX_RAW	3540 /* 3.0 dB -> 10^(3.0/20.0) * 2506 = 3540 */
#define IDT821034_GAIN_OUT_INIT_RAW	2506 /* 0dB -> 10^(0/20) * 2506 = 2506 */

static const struct snd_kcontrol_new idt821034_controls[] = {
	/* DAC volume control */
	SOC_SINGLE_RANGE_EXT_TLV("DAC0 Playback Volume", IDT821034_ID_OUT(0), 0,
				 IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_out),
	SOC_SINGLE_RANGE_EXT_TLV("DAC1 Playback Volume", IDT821034_ID_OUT(1), 0,
				 IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_out),
	SOC_SINGLE_RANGE_EXT_TLV("DAC2 Playback Volume", IDT821034_ID_OUT(2), 0,
				 IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_out),
	SOC_SINGLE_RANGE_EXT_TLV("DAC3 Playback Volume", IDT821034_ID_OUT(3), 0,
				 IDT821034_GAIN_OUT_MIN_RAW, IDT821034_GAIN_OUT_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_out),

	/* DAC mute control */
	SOC_SINGLE_BOOL_EXT("DAC0 Playback Switch", IDT821034_ID_OUT(0),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
	SOC_SINGLE_BOOL_EXT("DAC1 Playback Switch", IDT821034_ID_OUT(1),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
	SOC_SINGLE_BOOL_EXT("DAC2 Playback Switch", IDT821034_ID_OUT(2),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
	SOC_SINGLE_BOOL_EXT("DAC3 Playback Switch", IDT821034_ID_OUT(3),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),

	/* ADC volume control */
	SOC_SINGLE_RANGE_EXT_TLV("ADC0 Capture Volume", IDT821034_ID_IN(0), 0,
				 IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_in),
	SOC_SINGLE_RANGE_EXT_TLV("ADC1 Capture Volume", IDT821034_ID_IN(1), 0,
				 IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_in),
	SOC_SINGLE_RANGE_EXT_TLV("ADC2 Capture Volume", IDT821034_ID_IN(2), 0,
				 IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_in),
	SOC_SINGLE_RANGE_EXT_TLV("ADC3 Capture Volume", IDT821034_ID_IN(3), 0,
				 IDT821034_GAIN_IN_MIN_RAW, IDT821034_GAIN_IN_MAX_RAW,
				 0, idt821034_kctrl_gain_get, idt821034_kctrl_gain_put,
				 idt821034_gain_in),

	/* ADC mute control */
	SOC_SINGLE_BOOL_EXT("ADC0 Capture Switch", IDT821034_ID_IN(0),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
	SOC_SINGLE_BOOL_EXT("ADC1 Capture Switch", IDT821034_ID_IN(1),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
	SOC_SINGLE_BOOL_EXT("ADC2 Capture Switch", IDT821034_ID_IN(2),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
	SOC_SINGLE_BOOL_EXT("ADC3 Capture Switch", IDT821034_ID_IN(3),
			    idt821034_kctrl_mute_get, idt821034_kctrl_mute_put),
};

static int idt821034_power_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 idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
	unsigned int id = w->shift;
	u8 power, mask;
	int ret;
	u8 ch;

	ch = IDT821034_ID_GET_CHAN(id);
	mask = IDT821034_ID_IS_OUT(id) ? IDT821034_CONF_PWRUP_RX : IDT821034_CONF_PWRUP_TX;

	mutex_lock(&idt821034->mutex);

	power = idt821034_get_channel_power(idt821034, ch);
	if (SND_SOC_DAPM_EVENT_ON(event))
		power |= mask;
	else
		power &= ~mask;
	ret = idt821034_set_channel_power(idt821034, ch, power);

	mutex_unlock(&idt821034->mutex);

	return ret;
}

static const struct snd_soc_dapm_widget idt821034_dapm_widgets[] = {
	SND_SOC_DAPM_DAC_E("DAC0", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(0), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("DAC1", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(1), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("DAC2", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(2), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("DAC3", "Playback", SND_SOC_NOPM, IDT821034_ID_OUT(3), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

	SND_SOC_DAPM_OUTPUT("OUT0"),
	SND_SOC_DAPM_OUTPUT("OUT1"),
	SND_SOC_DAPM_OUTPUT("OUT2"),
	SND_SOC_DAPM_OUTPUT("OUT3"),

	SND_SOC_DAPM_DAC_E("ADC0", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(0), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("ADC1", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(1), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("ADC2", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(2), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),
	SND_SOC_DAPM_DAC_E("ADC3", "Capture", SND_SOC_NOPM, IDT821034_ID_IN(3), 0,
			   idt821034_power_event,
			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMD),

	SND_SOC_DAPM_INPUT("IN0"),
	SND_SOC_DAPM_INPUT("IN1"),
	SND_SOC_DAPM_INPUT("IN2"),
	SND_SOC_DAPM_INPUT("IN3"),
};

static const struct snd_soc_dapm_route idt821034_dapm_routes[] = {
	{ "OUT0", NULL, "DAC0" },
	{ "OUT1", NULL, "DAC1" },
	{ "OUT2", NULL, "DAC2" },
	{ "OUT3", NULL, "DAC3" },

	{ "ADC0", NULL, "IN0" },
	{ "ADC1", NULL, "IN1" },
	{ "ADC2", NULL, "IN2" },
	{ "ADC3", NULL, "IN3" },
};

static int idt821034_dai_set_tdm_slot(struct snd_soc_dai *dai,
				      unsigned int tx_mask, unsigned int rx_mask,
				      int slots, int width)
{
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
	unsigned int mask;
	u8 slot;
	int ret;
	u8 ch;

	switch (width) {
	case 0: /* Not set -> default 8 */
	case 8:
		break;
	default:
		dev_err(dai->dev, "tdm slot width %d not supported\n", width);
		return -EINVAL;
	}

	mask = tx_mask;
	slot = 0;
	ch = 0;
	while (mask && ch < IDT821034_NB_CHANNEL) {
		if (mask & 0x1) {
			mutex_lock(&idt821034->mutex);
			ret = idt821034_set_channel_ts(idt821034, ch, IDT821034_CH_RX, slot);
			mutex_unlock(&idt821034->mutex);
			if (ret) {
				dev_err(dai->dev, "ch%u set tx tdm slot failed (%d)\n",
					ch, ret);
				return ret;
			}
			ch++;
		}
		mask >>= 1;
		slot++;
	}
	if (mask) {
		dev_err(dai->dev, "too much tx slots defined (mask = 0x%x) support max %d\n",
			tx_mask, IDT821034_NB_CHANNEL);
		return -EINVAL;
	}
	idt821034->max_ch_playback = ch;

	mask = rx_mask;
	slot = 0;
	ch = 0;
	while (mask && ch < IDT821034_NB_CHANNEL) {
		if (mask & 0x1) {
			mutex_lock(&idt821034->mutex);
			ret = idt821034_set_channel_ts(idt821034, ch, IDT821034_CH_TX, slot);
			mutex_unlock(&idt821034->mutex);
			if (ret) {
				dev_err(dai->dev, "ch%u set rx tdm slot failed (%d)\n",
					ch, ret);
				return ret;
			}
			ch++;
		}
		mask >>= 1;
		slot++;
	}
	if (mask) {
		dev_err(dai->dev, "too much rx slots defined (mask = 0x%x) support max %d\n",
			rx_mask, IDT821034_NB_CHANNEL);
		return -EINVAL;
	}
	idt821034->max_ch_capture = ch;

	return 0;
}

static int idt821034_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
	u8 conf;
	int ret;

	mutex_lock(&idt821034->mutex);

	conf = idt821034_get_codec_conf(idt821034);

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_DSP_A:
		conf |= IDT821034_CONF_DELAY_MODE;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		conf &= ~IDT821034_CONF_DELAY_MODE;
		break;
	default:
		dev_err(dai->dev, "Unsupported DAI format 0x%x\n",
			fmt & SND_SOC_DAIFMT_FORMAT_MASK);
		ret = -EINVAL;
		goto end;
	}
	ret = idt821034_set_codec_conf(idt821034, conf);
end:
	mutex_unlock(&idt821034->mutex);
	return ret;
}

static int idt821034_dai_hw_params(struct snd_pcm_substream *substream,
				   struct snd_pcm_hw_params *params,
				   struct snd_soc_dai *dai)
{
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
	u8 conf;
	int ret;

	mutex_lock(&idt821034->mutex);

	conf = idt821034_get_codec_conf(idt821034);

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_A_LAW:
		conf |= IDT821034_CONF_ALAW_MODE;
		break;
	case SNDRV_PCM_FORMAT_MU_LAW:
		conf &= ~IDT821034_CONF_ALAW_MODE;
		break;
	default:
		dev_err(dai->dev, "Unsupported PCM format 0x%x\n",
			params_format(params));
		ret = -EINVAL;
		goto end;
	}
	ret = idt821034_set_codec_conf(idt821034, conf);
end:
	mutex_unlock(&idt821034->mutex);
	return ret;
}

static const unsigned int idt821034_sample_bits[] = {8};

static struct snd_pcm_hw_constraint_list idt821034_sample_bits_constr = {
	.list = idt821034_sample_bits,
	.count = ARRAY_SIZE(idt821034_sample_bits),
};

static int idt821034_dai_startup(struct snd_pcm_substream *substream,
				 struct snd_soc_dai *dai)
{
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(dai->component);
	unsigned int max_ch = 0;
	int ret;

	max_ch = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
		idt821034->max_ch_playback : idt821034->max_ch_capture;

	/*
	 * Disable stream support (min = 0, max = 0) if no timeslots were
	 * configured otherwise, limit the number of channels to those
	 * configured.
	 */
	ret = snd_pcm_hw_constraint_minmax(substream->runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
					   max_ch ? 1 : 0, max_ch);
	if (ret < 0)
		return ret;

	ret = snd_pcm_hw_constraint_list(substream->runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
					 &idt821034_sample_bits_constr);
	if (ret)
		return ret;

	return 0;
}

static const u64 idt821034_dai_formats[] = {
	SND_SOC_POSSIBLE_DAIFMT_DSP_A	|
	SND_SOC_POSSIBLE_DAIFMT_DSP_B,
};

static const struct snd_soc_dai_ops idt821034_dai_ops = {
	.startup      = idt821034_dai_startup,
	.hw_params    = idt821034_dai_hw_params,
	.set_tdm_slot = idt821034_dai_set_tdm_slot,
	.set_fmt      = idt821034_dai_set_fmt,
	.auto_selectable_formats     = idt821034_dai_formats,
	.num_auto_selectable_formats = ARRAY_SIZE(idt821034_dai_formats),
};

static struct snd_soc_dai_driver idt821034_dai_driver = {
	.name = "idt821034",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = IDT821034_NB_CHANNEL,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = IDT821034_NB_CHANNEL,
		.rates = SNDRV_PCM_RATE_8000,
		.formats = SNDRV_PCM_FMTBIT_MU_LAW | SNDRV_PCM_FMTBIT_A_LAW,
	},
	.ops = &idt821034_dai_ops,
};

static int idt821034_reset_audio(struct idt821034 *idt821034)
{
	int ret;
	u8 i;

	mutex_lock(&idt821034->mutex);

	ret = idt821034_set_codec_conf(idt821034, 0);
	if (ret)
		goto end;

	for (i = 0; i < IDT821034_NB_CHANNEL; i++) {
		idt821034->amps.ch[i].amp_out.gain = IDT821034_GAIN_OUT_INIT_RAW;
		idt821034->amps.ch[i].amp_out.is_muted = false;
		ret = idt821034_set_gain_channel(idt821034, i, IDT821034_GAIN_RX,
						 idt821034->amps.ch[i].amp_out.gain);
		if (ret)
			goto end;

		idt821034->amps.ch[i].amp_in.gain = IDT821034_GAIN_IN_INIT_RAW;
		idt821034->amps.ch[i].amp_in.is_muted = false;
		ret = idt821034_set_gain_channel(idt821034, i, IDT821034_GAIN_TX,
						 idt821034->amps.ch[i].amp_in.gain);
		if (ret)
			goto end;

		ret = idt821034_set_channel_power(idt821034, i, 0);
		if (ret)
			goto end;
	}

	ret = 0;
end:
	mutex_unlock(&idt821034->mutex);
	return ret;
}

static int idt821034_component_probe(struct snd_soc_component *component)
{
	struct idt821034 *idt821034 = snd_soc_component_get_drvdata(component);
	int ret;

	/* reset idt821034 audio part*/
	ret = idt821034_reset_audio(idt821034);
	if (ret)
		return ret;

	return 0;
}

static const struct snd_soc_component_driver idt821034_component_driver = {
	.probe			= idt821034_component_probe,
	.controls		= idt821034_controls,
	.num_controls		= ARRAY_SIZE(idt821034_controls),
	.dapm_widgets		= idt821034_dapm_widgets,
	.num_dapm_widgets	= ARRAY_SIZE(idt821034_dapm_widgets),
	.dapm_routes		= idt821034_dapm_routes,
	.num_dapm_routes	= ARRAY_SIZE(idt821034_dapm_routes),
	.endianness		= 1,
};

#define IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(_offset) (((_offset) / 5) % 4)
#define IDT821034_GPIO_OFFSET_TO_SLIC_MASK(_offset)    BIT((_offset) % 5)

static int idt821034_chip_gpio_set(struct gpio_chip *c, unsigned int offset,
				   int val)
{
	u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
	u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
	struct idt821034 *idt821034 = gpiochip_get_data(c);
	u8 slic_raw;
	int ret;

	mutex_lock(&idt821034->mutex);

	slic_raw = idt821034_get_written_slic_raw(idt821034, ch);
	if (val)
		slic_raw |= mask;
	else
		slic_raw &= ~mask;
	ret = idt821034_write_slic_raw(idt821034, ch, slic_raw);

	mutex_unlock(&idt821034->mutex);

	if (ret)
		dev_err(&idt821034->spi->dev, "set gpio %d (%u, 0x%x) failed (%d)\n",
			offset, ch, mask, ret);

	return ret;
}

static int idt821034_chip_gpio_get(struct gpio_chip *c, unsigned int offset)
{
	u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
	u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
	struct idt821034 *idt821034 = gpiochip_get_data(c);
	u8 slic_raw;
	int ret;

	mutex_lock(&idt821034->mutex);
	ret = idt821034_read_slic_raw(idt821034, ch, &slic_raw);
	mutex_unlock(&idt821034->mutex);
	if (ret) {
		dev_err(&idt821034->spi->dev, "get gpio %d (%u, 0x%x) failed (%d)\n",
			offset, ch, mask, ret);
		return ret;
	}

	/*
	 * SLIC IOs are read in reverse order compared to write.
	 * Reverse the read value here in order to have IO0 at lsb (ie same
	 * order as write)
	 */
	return !!(bitrev8(slic_raw) & mask);
}

static int idt821034_chip_get_direction(struct gpio_chip *c, unsigned int offset)
{
	u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
	u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
	struct idt821034 *idt821034 = gpiochip_get_data(c);
	u8 slic_dir;

	mutex_lock(&idt821034->mutex);
	slic_dir = idt821034_get_slic_conf(idt821034, ch);
	mutex_unlock(&idt821034->mutex);

	return slic_dir & mask ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
}

static int idt821034_chip_direction_input(struct gpio_chip *c, unsigned int offset)
{
	u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
	u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
	struct idt821034 *idt821034 = gpiochip_get_data(c);
	u8 slic_conf;
	int ret;

	/* Only IO0 and IO1 can be set as input */
	if (mask & ~(IDT821034_SLIC_IO1_IN | IDT821034_SLIC_IO0_IN))
		return -EPERM;

	mutex_lock(&idt821034->mutex);

	slic_conf = idt821034_get_slic_conf(idt821034, ch) | mask;

	ret = idt821034_set_slic_conf(idt821034, ch, slic_conf);
	if (ret) {
		dev_err(&idt821034->spi->dev, "dir in gpio %d (%u, 0x%x) failed (%d)\n",
			offset, ch, mask, ret);
	}

	mutex_unlock(&idt821034->mutex);
	return ret;
}

static int idt821034_chip_direction_output(struct gpio_chip *c, unsigned int offset, int val)
{
	u8 ch = IDT821034_GPIO_OFFSET_TO_SLIC_CHANNEL(offset);
	u8 mask = IDT821034_GPIO_OFFSET_TO_SLIC_MASK(offset);
	struct idt821034 *idt821034 = gpiochip_get_data(c);
	u8 slic_conf;
	int ret;

	ret = idt821034_chip_gpio_set(c, offset, val);
	if (ret)
		return ret;

	mutex_lock(&idt821034->mutex);

	slic_conf = idt821034_get_slic_conf(idt821034, ch) & ~mask;

	ret = idt821034_set_slic_conf(idt821034, ch, slic_conf);
	if (ret) {
		dev_err(&idt821034->spi->dev, "dir out gpio %d (%u, 0x%x) failed (%d)\n",
			offset, ch, mask, ret);
	}

	mutex_unlock(&idt821034->mutex);
	return ret;
}

static int idt821034_reset_gpio(struct idt821034 *idt821034)
{
	int ret;
	u8 i;

	mutex_lock(&idt821034->mutex);

	/* IO0 and IO1 as input for all channels and output IO set to 0 */
	for (i = 0; i < IDT821034_NB_CHANNEL; i++) {
		ret = idt821034_set_slic_conf(idt821034, i,
					      IDT821034_SLIC_IO1_IN | IDT821034_SLIC_IO0_IN);
		if (ret)
			goto end;

		ret = idt821034_write_slic_raw(idt821034, i, 0);
		if (ret)
			goto end;

	}
	ret = 0;
end:
	mutex_unlock(&idt821034->mutex);
	return ret;
}

static int idt821034_gpio_init(struct idt821034 *idt821034)
{
	int ret;

	ret = idt821034_reset_gpio(idt821034);
	if (ret)
		return ret;

	idt821034->gpio_chip.owner = THIS_MODULE;
	idt821034->gpio_chip.label = dev_name(&idt821034->spi->dev);
	idt821034->gpio_chip.parent = &idt821034->spi->dev;
	idt821034->gpio_chip.base = -1;
	idt821034->gpio_chip.ngpio = 5 * 4; /* 5 GPIOs on 4 channels */
	idt821034->gpio_chip.get_direction = idt821034_chip_get_direction;
	idt821034->gpio_chip.direction_input = idt821034_chip_direction_input;
	idt821034->gpio_chip.direction_output = idt821034_chip_direction_output;
	idt821034->gpio_chip.get = idt821034_chip_gpio_get;
	idt821034->gpio_chip.set = idt821034_chip_gpio_set;
	idt821034->gpio_chip.can_sleep = true;

	return devm_gpiochip_add_data(&idt821034->spi->dev, &idt821034->gpio_chip,
				      idt821034);
}

static int idt821034_spi_probe(struct spi_device *spi)
{
	struct idt821034 *idt821034;
	int ret;

	spi->bits_per_word = 8;
	ret = spi_setup(spi);
	if (ret < 0)
		return ret;

	idt821034 = devm_kzalloc(&spi->dev, sizeof(*idt821034), GFP_KERNEL);
	if (!idt821034)
		return -ENOMEM;

	idt821034->spi = spi;

	mutex_init(&idt821034->mutex);

	spi_set_drvdata(spi, idt821034);

	ret = devm_snd_soc_register_component(&spi->dev, &idt821034_component_driver,
					      &idt821034_dai_driver, 1);
	if (ret)
		return ret;

	if (IS_ENABLED(CONFIG_GPIOLIB))
		return idt821034_gpio_init(idt821034);

	return 0;
}

static const struct of_device_id idt821034_of_match[] = {
	{ .compatible = "renesas,idt821034", },
	{ }
};
MODULE_DEVICE_TABLE(of, idt821034_of_match);

static const struct spi_device_id idt821034_id_table[] = {
	{ "idt821034", 0 },
	{ }
};
MODULE_DEVICE_TABLE(spi, idt821034_id_table);

static struct spi_driver idt821034_spi_driver = {
	.driver  = {
		.name   = "idt821034",
		.of_match_table = idt821034_of_match,
	},
	.id_table = idt821034_id_table,
	.probe  = idt821034_spi_probe,
};

module_spi_driver(idt821034_spi_driver);

MODULE_AUTHOR("Herve Codina <herve.codina@bootlin.com>");
MODULE_DESCRIPTION("IDT821034 ALSA SoC driver");
MODULE_LICENSE("GPL");
