drivers/iio/frequency/adrf6780.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * ADRF6780 driver
  *
  * Copyright 2021 Analog Devices Inc.
  */

 #include <linux/bitfield.h>
 #include <linux/bits.h>
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/iio/iio.h>
 #include <linux/module.h>
 #include <linux/mod_devicetable.h>
 #include <linux/spi/spi.h>

 #include <asm/unaligned.h>

 /* ADRF6780 Register Map */
 #define ADRF6780_REG_CONTROL			0x00
 #define ADRF6780_REG_ALARM_READBACK		0x01
 #define ADRF6780_REG_ALARM_MASKS		0x02
 #define ADRF6780_REG_ENABLE			0x03
 #define ADRF6780_REG_LINEARIZE			0x04
 #define ADRF6780_REG_LO_PATH			0x05
 #define ADRF6780_REG_ADC_CONTROL		0x06
 #define ADRF6780_REG_ADC_OUTPUT			0x0C

 /* ADRF6780_REG_CONTROL Map */
 #define ADRF6780_PARITY_EN_MSK			BIT(15)
 #define ADRF6780_SOFT_RESET_MSK			BIT(14)
 #define ADRF6780_CHIP_ID_MSK			GENMASK(11, 4)
 #define ADRF6780_CHIP_ID			0xA
 #define ADRF6780_CHIP_REVISION_MSK		GENMASK(3, 0)

 /* ADRF6780_REG_ALARM_READBACK Map */
 #define ADRF6780_PARITY_ERROR_MSK		BIT(15)
 #define ADRF6780_TOO_FEW_ERRORS_MSK		BIT(14)
 #define ADRF6780_TOO_MANY_ERRORS_MSK		BIT(13)
 #define ADRF6780_ADDRESS_RANGE_ERROR_MSK	BIT(12)

 /* ADRF6780_REG_ENABLE Map */
 #define ADRF6780_VGA_BUFFER_EN_MSK		BIT(8)
 #define ADRF6780_DETECTOR_EN_MSK		BIT(7)
 #define ADRF6780_LO_BUFFER_EN_MSK		BIT(6)
 #define ADRF6780_IF_MODE_EN_MSK			BIT(5)
 #define ADRF6780_IQ_MODE_EN_MSK			BIT(4)
 #define ADRF6780_LO_X2_EN_MSK			BIT(3)
 #define ADRF6780_LO_PPF_EN_MSK			BIT(2)
 #define ADRF6780_LO_EN_MSK			BIT(1)
 #define ADRF6780_UC_BIAS_EN_MSK			BIT(0)

 /* ADRF6780_REG_LINEARIZE Map */
 #define ADRF6780_RDAC_LINEARIZE_MSK		GENMASK(7, 0)

 /* ADRF6780_REG_LO_PATH Map */
 #define ADRF6780_LO_SIDEBAND_MSK		BIT(10)
 #define ADRF6780_Q_PATH_PHASE_ACCURACY_MSK	GENMASK(7, 4)
 #define ADRF6780_I_PATH_PHASE_ACCURACY_MSK	GENMASK(3, 0)

 /* ADRF6780_REG_ADC_CONTROL Map */
 #define ADRF6780_VDET_OUTPUT_SELECT_MSK		BIT(3)
 #define ADRF6780_ADC_START_MSK			BIT(2)
 #define ADRF6780_ADC_EN_MSK			BIT(1)
 #define ADRF6780_ADC_CLOCK_EN_MSK		BIT(0)

 /* ADRF6780_REG_ADC_OUTPUT Map */
 #define ADRF6780_ADC_STATUS_MSK			BIT(8)
 #define ADRF6780_ADC_VALUE_MSK			GENMASK(7, 0)

 struct adrf6780_state {
 	struct spi_device	*spi;
 	struct clk		*clkin;
 	/* Protect against concurrent accesses to the device */
 	struct mutex		lock;
 	bool			vga_buff_en;
 	bool			lo_buff_en;
 	bool			if_mode_en;
 	bool			iq_mode_en;
 	bool			lo_x2_en;
 	bool			lo_ppf_en;
 	bool			lo_en;
 	bool			uc_bias_en;
 	bool			lo_sideband;
 	bool			vdet_out_en;
 	u8			data[3] ____cacheline_aligned;
 };

 static int __adrf6780_spi_read(struct adrf6780_state *st, unsigned int reg,
 			       unsigned int *val)
 {
 	int ret;
 	struct spi_transfer t = {0};

 	st->data[0] = 0x80 | (reg << 1);
 	st->data[1] = 0x0;
 	st->data[2] = 0x0;

 	t.rx_buf = &st->data[0];
 	t.tx_buf = &st->data[0];
 	t.len = 3;

 	ret = spi_sync_transfer(st->spi, &t, 1);
 	if (ret)
 		return ret;

 	*val = (get_unaligned_be24(&st->data[0]) >> 1) & GENMASK(15, 0);

 	return ret;
 }

 static int adrf6780_spi_read(struct adrf6780_state *st, unsigned int reg,
 			     unsigned int *val)
 {
 	int ret;

 	mutex_lock(&st->lock);
 	ret = __adrf6780_spi_read(st, reg, val);
 	mutex_unlock(&st->lock);

 	return ret;
 }

 static int __adrf6780_spi_write(struct adrf6780_state *st,
 				unsigned int reg,
 				unsigned int val)
 {
 	put_unaligned_be24((val << 1) | (reg << 17), &st->data[0]);

 	return spi_write(st->spi, &st->data[0], 3);
 }

 static int adrf6780_spi_write(struct adrf6780_state *st, unsigned int reg,
 			      unsigned int val)
 {
 	int ret;

 	mutex_lock(&st->lock);
 	ret = __adrf6780_spi_write(st, reg, val);
 	mutex_unlock(&st->lock);

 	return ret;
 }

 static int __adrf6780_spi_update_bits(struct adrf6780_state *st,
 				      unsigned int reg, unsigned int mask,
 				      unsigned int val)
 {
 	int ret;
 	unsigned int data, temp;

 	ret = __adrf6780_spi_read(st, reg, &data);
 	if (ret)
 		return ret;

 	temp = (data & ~mask) | (val & mask);

 	return __adrf6780_spi_write(st, reg, temp);
 }

 static int adrf6780_spi_update_bits(struct adrf6780_state *st, unsigned int reg,
 				    unsigned int mask, unsigned int val)
 {
 	int ret;

 	mutex_lock(&st->lock);
 	ret = __adrf6780_spi_update_bits(st, reg, mask, val);
 	mutex_unlock(&st->lock);

 	return ret;
 }

 static int adrf6780_read_adc_raw(struct adrf6780_state *st, unsigned int *read_val)
 {
 	int ret;

 	mutex_lock(&st->lock);

 	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
 					 ADRF6780_ADC_EN_MSK |
 					 ADRF6780_ADC_CLOCK_EN_MSK |
 					 ADRF6780_ADC_START_MSK,
 					 FIELD_PREP(ADRF6780_ADC_EN_MSK, 1) |
 					 FIELD_PREP(ADRF6780_ADC_CLOCK_EN_MSK, 1) |
 					 FIELD_PREP(ADRF6780_ADC_START_MSK, 1));
 	if (ret)
 		goto exit;

 	/* Recommended delay for the ADC to be ready*/
 	usleep_range(200, 250);

 	ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);
 	if (ret)
 		goto exit;

 	if (!(*read_val & ADRF6780_ADC_STATUS_MSK)) {
 		ret = -EINVAL;
 		goto exit;
 	}

 	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
 					 ADRF6780_ADC_START_MSK,
 					 FIELD_PREP(ADRF6780_ADC_START_MSK, 0));
 	if (ret)
 		goto exit;

 	ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);

 exit:
 	mutex_unlock(&st->lock);
 	return ret;
 }

 static int adrf6780_read_raw(struct iio_dev *indio_dev,
 			     struct iio_chan_spec const *chan,
 			     int *val, int *val2, long info)
 {
 	struct adrf6780_state *dev = iio_priv(indio_dev);
 	unsigned int data;
 	int ret;

 	switch (info) {
 	case IIO_CHAN_INFO_RAW:
 		ret = adrf6780_read_adc_raw(dev, &data);
 		if (ret)
 			return ret;

 		*val = data & ADRF6780_ADC_VALUE_MSK;

 		return IIO_VAL_INT;

 	case IIO_CHAN_INFO_SCALE:
 		ret = adrf6780_spi_read(dev, ADRF6780_REG_LINEARIZE, &data);
 		if (ret)
 			return ret;

 		*val = data & ADRF6780_RDAC_LINEARIZE_MSK;

 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_PHASE:
 		ret = adrf6780_spi_read(dev, ADRF6780_REG_LO_PATH, &data);
 		if (ret)
 			return ret;

 		switch (chan->channel2) {
 		case IIO_MOD_I:
 			*val = data & ADRF6780_I_PATH_PHASE_ACCURACY_MSK;

 			return IIO_VAL_INT;
 		case IIO_MOD_Q:
 			*val = FIELD_GET(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK,
 					 data);

 			return IIO_VAL_INT;
 		default:
 			return -EINVAL;
 		}
 	default:
 		return -EINVAL;
 	}
 }

 static int adrf6780_write_raw(struct iio_dev *indio_dev,
 			      struct iio_chan_spec const *chan,
 			      int val, int val2, long info)
 {
 	struct adrf6780_state *st = iio_priv(indio_dev);

 	switch (info) {
 	case IIO_CHAN_INFO_SCALE:
 		return adrf6780_spi_write(st, ADRF6780_REG_LINEARIZE, val);
 	case IIO_CHAN_INFO_PHASE:
 		switch (chan->channel2) {
 		case IIO_MOD_I:
 			return adrf6780_spi_update_bits(st,
 				ADRF6780_REG_LO_PATH,
 				ADRF6780_I_PATH_PHASE_ACCURACY_MSK,
 				FIELD_PREP(ADRF6780_I_PATH_PHASE_ACCURACY_MSK, val));
 		case IIO_MOD_Q:
 			return adrf6780_spi_update_bits(st,
 				ADRF6780_REG_LO_PATH,
 				ADRF6780_Q_PATH_PHASE_ACCURACY_MSK,
 				FIELD_PREP(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, val));
 		default:
 			return -EINVAL;
 		}
 	default:
 		return -EINVAL;
 	}
 }

 static int adrf6780_reg_access(struct iio_dev *indio_dev,
 			       unsigned int reg,
 			       unsigned int write_val,
 			       unsigned int *read_val)
 {
 	struct adrf6780_state *st = iio_priv(indio_dev);

 	if (read_val)
 		return adrf6780_spi_read(st, reg, read_val);
 	else
 		return adrf6780_spi_write(st, reg, write_val);
 }

 static const struct iio_info adrf6780_info = {
 	.read_raw = adrf6780_read_raw,
 	.write_raw = adrf6780_write_raw,
 	.debugfs_reg_access = &adrf6780_reg_access,
 };

 #define ADRF6780_CHAN_ADC(_channel) {			\
 	.type = IIO_ALTVOLTAGE,				\
 	.output = 0,					\
 	.indexed = 1,					\
 	.channel = _channel,				\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW)	\
 }

 #define ADRF6780_CHAN_RDAC(_channel) {			\
 	.type = IIO_ALTVOLTAGE,				\
 	.output = 1,					\
 	.indexed = 1,					\
 	.channel = _channel,				\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_SCALE)	\
 }

 #define ADRF6780_CHAN_IQ_PHASE(_channel, rf_comp) {		\
 	.type = IIO_ALTVOLTAGE,					\
 	.modified = 1,						\
 	.output = 1,						\
 	.indexed = 1,						\
 	.channel2 = IIO_MOD_##rf_comp,				\
 	.channel = _channel,					\
 	.info_mask_separate = BIT(IIO_CHAN_INFO_PHASE)		\
 }

 static const struct iio_chan_spec adrf6780_channels[] = {
 	ADRF6780_CHAN_ADC(0),
 	ADRF6780_CHAN_RDAC(0),
 	ADRF6780_CHAN_IQ_PHASE(0, I),
 	ADRF6780_CHAN_IQ_PHASE(0, Q),
 };

 static int adrf6780_reset(struct adrf6780_state *st)
 {
 	int ret;
 	struct spi_device *spi = st->spi;

 	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_CONTROL,
 					 ADRF6780_SOFT_RESET_MSK,
 					 FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 1));
 	if (ret) {
 		dev_err(&spi->dev, "ADRF6780 SPI software reset failed.\n");
 		return ret;
 	}

 	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_CONTROL,
 					 ADRF6780_SOFT_RESET_MSK,
 					 FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 0));
 	if (ret) {
 		dev_err(&spi->dev, "ADRF6780 SPI software reset disable failed.\n");
 		return ret;
 	}

 	return 0;
 }

 static int adrf6780_init(struct adrf6780_state *st)
 {
 	int ret;
 	unsigned int chip_id, enable_reg, enable_reg_msk;
 	struct spi_device *spi = st->spi;

 	/* Perform a software reset */
 	ret = adrf6780_reset(st);
 	if (ret)
 		return ret;

 	ret = __adrf6780_spi_read(st, ADRF6780_REG_CONTROL, &chip_id);
 	if (ret)
 		return ret;

 	chip_id = FIELD_GET(ADRF6780_CHIP_ID_MSK, chip_id);
 	if (chip_id != ADRF6780_CHIP_ID) {
 		dev_err(&spi->dev, "ADRF6780 Invalid Chip ID.\n");
 		return -EINVAL;
 	}

 	enable_reg_msk = ADRF6780_VGA_BUFFER_EN_MSK |
 			ADRF6780_DETECTOR_EN_MSK |
 			ADRF6780_LO_BUFFER_EN_MSK |
 			ADRF6780_IF_MODE_EN_MSK |
 			ADRF6780_IQ_MODE_EN_MSK |
 			ADRF6780_LO_X2_EN_MSK |
 			ADRF6780_LO_PPF_EN_MSK |
 			ADRF6780_LO_EN_MSK |
 			ADRF6780_UC_BIAS_EN_MSK;

 	enable_reg = FIELD_PREP(ADRF6780_VGA_BUFFER_EN_MSK, st->vga_buff_en) |
 			FIELD_PREP(ADRF6780_DETECTOR_EN_MSK, 1) |
 			FIELD_PREP(ADRF6780_LO_BUFFER_EN_MSK, st->lo_buff_en) |
 			FIELD_PREP(ADRF6780_IF_MODE_EN_MSK, st->if_mode_en) |
 			FIELD_PREP(ADRF6780_IQ_MODE_EN_MSK, st->iq_mode_en) |
 			FIELD_PREP(ADRF6780_LO_X2_EN_MSK, st->lo_x2_en) |
 			FIELD_PREP(ADRF6780_LO_PPF_EN_MSK, st->lo_ppf_en) |
 			FIELD_PREP(ADRF6780_LO_EN_MSK, st->lo_en) |
 			FIELD_PREP(ADRF6780_UC_BIAS_EN_MSK, st->uc_bias_en);

 	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ENABLE,
 					 enable_reg_msk, enable_reg);
 	if (ret)
 		return ret;

 	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_LO_PATH,
 					 ADRF6780_LO_SIDEBAND_MSK,
 					 FIELD_PREP(ADRF6780_LO_SIDEBAND_MSK, st->lo_sideband));
 	if (ret)
 		return ret;

 	return __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
 		ADRF6780_VDET_OUTPUT_SELECT_MSK,
 		FIELD_PREP(ADRF6780_VDET_OUTPUT_SELECT_MSK, st->vdet_out_en));
 }

 static void adrf6780_properties_parse(struct adrf6780_state *st)
 {
 	struct spi_device *spi = st->spi;

 	st->vga_buff_en = device_property_read_bool(&spi->dev, "adi,vga-buff-en");
 	st->lo_buff_en = device_property_read_bool(&spi->dev, "adi,lo-buff-en");
 	st->if_mode_en = device_property_read_bool(&spi->dev, "adi,if-mode-en");
 	st->iq_mode_en = device_property_read_bool(&spi->dev, "adi,iq-mode-en");
 	st->lo_x2_en = device_property_read_bool(&spi->dev, "adi,lo-x2-en");
 	st->lo_ppf_en = device_property_read_bool(&spi->dev, "adi,lo-ppf-en");
 	st->lo_en = device_property_read_bool(&spi->dev, "adi,lo-en");
 	st->uc_bias_en = device_property_read_bool(&spi->dev, "adi,uc-bias-en");
 	st->lo_sideband = device_property_read_bool(&spi->dev, "adi,lo-sideband");
 	st->vdet_out_en = device_property_read_bool(&spi->dev, "adi,vdet-out-en");
 }

 static void adrf6780_clk_disable(void *data)
 {
 	clk_disable_unprepare(data);
 }

 static void adrf6780_powerdown(void *data)
 {
 	/* Disable all components in the Enable Register */
 	adrf6780_spi_write(data, ADRF6780_REG_ENABLE, 0x0);
 }

 static int adrf6780_probe(struct spi_device *spi)
 {
 	struct iio_dev *indio_dev;
 	struct adrf6780_state *st;
 	int ret;

 	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
 	if (!indio_dev)
 		return -ENOMEM;

 	st = iio_priv(indio_dev);

 	indio_dev->info = &adrf6780_info;
 	indio_dev->name = "adrf6780";
 	indio_dev->channels = adrf6780_channels;
 	indio_dev->num_channels = ARRAY_SIZE(adrf6780_channels);

 	st->spi = spi;

 	adrf6780_properties_parse(st);

 	st->clkin = devm_clk_get(&spi->dev, "lo_in");
 	if (IS_ERR(st->clkin))
 		return dev_err_probe(&spi->dev, PTR_ERR(st->clkin),
 				     "failed to get the LO input clock\n");

 	ret = clk_prepare_enable(st->clkin);
 	if (ret)
 		return ret;

 	ret = devm_add_action_or_reset(&spi->dev, adrf6780_clk_disable,
 				       st->clkin);
 	if (ret)
 		return ret;

 	mutex_init(&st->lock);

 	ret = adrf6780_init(st);
 	if (ret)
 		return ret;

 	ret = devm_add_action_or_reset(&spi->dev, adrf6780_powerdown, st);
 	if (ret)
 		return ret;

 	return devm_iio_device_register(&spi->dev, indio_dev);
 }

 static const struct spi_device_id adrf6780_id[] = {
 	{ "adrf6780", 0 },
 	{}
 };
 MODULE_DEVICE_TABLE(spi, adrf6780_id);

 static const struct of_device_id adrf6780_of_match[] = {
 	{ .compatible = "adi,adrf6780" },
 	{}
 };
 MODULE_DEVICE_TABLE(of, adrf6780_of_match);

 static struct spi_driver adrf6780_driver = {
 	.driver = {
 		.name = "adrf6780",
 		.of_match_table = adrf6780_of_match,
 	},
 	.probe = adrf6780_probe,
 	.id_table = adrf6780_id,
 };
 module_spi_driver(adrf6780_driver);

 MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com");
 MODULE_DESCRIPTION("Analog Devices ADRF6780");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* ADRF6780 driver
	*
	* Copyright 2021 Analog Devices Inc.
	*/

	#include <linux/bitfield.h>
	#include <linux/bits.h>
	#include <linux/clk.h>
	#include <linux/clkdev.h>
	#include <linux/clk-provider.h>
	#include <linux/delay.h>
	#include <linux/device.h>
	#include <linux/iio/iio.h>
	#include <linux/module.h>
	#include <linux/mod_devicetable.h>
	#include <linux/spi/spi.h>

	#include <asm/unaligned.h>

	/* ADRF6780 Register Map */
	#define ADRF6780_REG_CONTROL 0x00
	#define ADRF6780_REG_ALARM_READBACK 0x01
	#define ADRF6780_REG_ALARM_MASKS 0x02
	#define ADRF6780_REG_ENABLE 0x03
	#define ADRF6780_REG_LINEARIZE 0x04
	#define ADRF6780_REG_LO_PATH 0x05
	#define ADRF6780_REG_ADC_CONTROL 0x06
	#define ADRF6780_REG_ADC_OUTPUT 0x0C

	/* ADRF6780_REG_CONTROL Map */
	#define ADRF6780_PARITY_EN_MSK BIT(15)
	#define ADRF6780_SOFT_RESET_MSK BIT(14)
	#define ADRF6780_CHIP_ID_MSK GENMASK(11, 4)
	#define ADRF6780_CHIP_ID 0xA
	#define ADRF6780_CHIP_REVISION_MSK GENMASK(3, 0)

	/* ADRF6780_REG_ALARM_READBACK Map */
	#define ADRF6780_PARITY_ERROR_MSK BIT(15)
	#define ADRF6780_TOO_FEW_ERRORS_MSK BIT(14)
	#define ADRF6780_TOO_MANY_ERRORS_MSK BIT(13)
	#define ADRF6780_ADDRESS_RANGE_ERROR_MSK BIT(12)

	/* ADRF6780_REG_ENABLE Map */
	#define ADRF6780_VGA_BUFFER_EN_MSK BIT(8)
	#define ADRF6780_DETECTOR_EN_MSK BIT(7)
	#define ADRF6780_LO_BUFFER_EN_MSK BIT(6)
	#define ADRF6780_IF_MODE_EN_MSK BIT(5)
	#define ADRF6780_IQ_MODE_EN_MSK BIT(4)
	#define ADRF6780_LO_X2_EN_MSK BIT(3)
	#define ADRF6780_LO_PPF_EN_MSK BIT(2)
	#define ADRF6780_LO_EN_MSK BIT(1)
	#define ADRF6780_UC_BIAS_EN_MSK BIT(0)

	/* ADRF6780_REG_LINEARIZE Map */
	#define ADRF6780_RDAC_LINEARIZE_MSK GENMASK(7, 0)

	/* ADRF6780_REG_LO_PATH Map */
	#define ADRF6780_LO_SIDEBAND_MSK BIT(10)
	#define ADRF6780_Q_PATH_PHASE_ACCURACY_MSK GENMASK(7, 4)
	#define ADRF6780_I_PATH_PHASE_ACCURACY_MSK GENMASK(3, 0)

	/* ADRF6780_REG_ADC_CONTROL Map */
	#define ADRF6780_VDET_OUTPUT_SELECT_MSK BIT(3)
	#define ADRF6780_ADC_START_MSK BIT(2)
	#define ADRF6780_ADC_EN_MSK BIT(1)
	#define ADRF6780_ADC_CLOCK_EN_MSK BIT(0)

	/* ADRF6780_REG_ADC_OUTPUT Map */
	#define ADRF6780_ADC_STATUS_MSK BIT(8)
	#define ADRF6780_ADC_VALUE_MSK GENMASK(7, 0)

	struct adrf6780_state {
	struct spi_device *spi;
	struct clk *clkin;
	/* Protect against concurrent accesses to the device */
	struct mutex lock;
	bool vga_buff_en;
	bool lo_buff_en;
	bool if_mode_en;
	bool iq_mode_en;
	bool lo_x2_en;
	bool lo_ppf_en;
	bool lo_en;
	bool uc_bias_en;
	bool lo_sideband;
	bool vdet_out_en;
	u8 data[3] ____cacheline_aligned;
	};

	static int __adrf6780_spi_read(struct adrf6780_state *st, unsigned int reg,
	unsigned int *val)
	{
	int ret;
	struct spi_transfer t = {0};

	st->data[0] = 0x80 \| (reg << 1);
	st->data[1] = 0x0;
	st->data[2] = 0x0;

	t.rx_buf = &st->data[0];
	t.tx_buf = &st->data[0];
	t.len = 3;

	ret = spi_sync_transfer(st->spi, &t, 1);
	if (ret)
	return ret;

	*val = (get_unaligned_be24(&st->data[0]) >> 1) & GENMASK(15, 0);

	return ret;
	}

	static int adrf6780_spi_read(struct adrf6780_state *st, unsigned int reg,
	unsigned int *val)
	{
	int ret;

	mutex_lock(&st->lock);
	ret = __adrf6780_spi_read(st, reg, val);
	mutex_unlock(&st->lock);

	return ret;
	}

	static int __adrf6780_spi_write(struct adrf6780_state *st,
	unsigned int reg,
	unsigned int val)
	{
	put_unaligned_be24((val << 1) \| (reg << 17), &st->data[0]);

	return spi_write(st->spi, &st->data[0], 3);
	}

	static int adrf6780_spi_write(struct adrf6780_state *st, unsigned int reg,
	unsigned int val)
	{
	int ret;

	mutex_lock(&st->lock);
	ret = __adrf6780_spi_write(st, reg, val);
	mutex_unlock(&st->lock);

	return ret;
	}

	static int __adrf6780_spi_update_bits(struct adrf6780_state *st,
	unsigned int reg, unsigned int mask,
	unsigned int val)
	{
	int ret;
	unsigned int data, temp;

	ret = __adrf6780_spi_read(st, reg, &data);
	if (ret)
	return ret;

	temp = (data & ~mask) \| (val & mask);

	return __adrf6780_spi_write(st, reg, temp);
	}

	static int adrf6780_spi_update_bits(struct adrf6780_state *st, unsigned int reg,
	unsigned int mask, unsigned int val)
	{
	int ret;

	mutex_lock(&st->lock);
	ret = __adrf6780_spi_update_bits(st, reg, mask, val);
	mutex_unlock(&st->lock);

	return ret;
	}

	static int adrf6780_read_adc_raw(struct adrf6780_state st, unsigned int read_val)
	{
	int ret;

	mutex_lock(&st->lock);

	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
	ADRF6780_ADC_EN_MSK \|
	ADRF6780_ADC_CLOCK_EN_MSK \|
	ADRF6780_ADC_START_MSK,
	FIELD_PREP(ADRF6780_ADC_EN_MSK, 1) \|
	FIELD_PREP(ADRF6780_ADC_CLOCK_EN_MSK, 1) \|
	FIELD_PREP(ADRF6780_ADC_START_MSK, 1));
	if (ret)
	goto exit;

	/* Recommended delay for the ADC to be ready*/
	usleep_range(200, 250);

	ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);
	if (ret)
	goto exit;

	if (!(*read_val & ADRF6780_ADC_STATUS_MSK)) {
	ret = -EINVAL;
	goto exit;
	}

	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
	ADRF6780_ADC_START_MSK,
	FIELD_PREP(ADRF6780_ADC_START_MSK, 0));
	if (ret)
	goto exit;

	ret = __adrf6780_spi_read(st, ADRF6780_REG_ADC_OUTPUT, read_val);

	exit:
	mutex_unlock(&st->lock);
	return ret;
	}

	static int adrf6780_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long info)
	{
	struct adrf6780_state *dev = iio_priv(indio_dev);
	unsigned int data;
	int ret;

	switch (info) {
	case IIO_CHAN_INFO_RAW:
	ret = adrf6780_read_adc_raw(dev, &data);
	if (ret)
	return ret;

	*val = data & ADRF6780_ADC_VALUE_MSK;

	return IIO_VAL_INT;

	case IIO_CHAN_INFO_SCALE:
	ret = adrf6780_spi_read(dev, ADRF6780_REG_LINEARIZE, &data);
	if (ret)
	return ret;

	*val = data & ADRF6780_RDAC_LINEARIZE_MSK;

	return IIO_VAL_INT;
	case IIO_CHAN_INFO_PHASE:
	ret = adrf6780_spi_read(dev, ADRF6780_REG_LO_PATH, &data);
	if (ret)
	return ret;

	switch (chan->channel2) {
	case IIO_MOD_I:
	*val = data & ADRF6780_I_PATH_PHASE_ACCURACY_MSK;

	return IIO_VAL_INT;
	case IIO_MOD_Q:
	*val = FIELD_GET(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK,
	data);

	return IIO_VAL_INT;
	default:
	return -EINVAL;
	}
	default:
	return -EINVAL;
	}
	}

	static int adrf6780_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val, int val2, long info)
	{
	struct adrf6780_state *st = iio_priv(indio_dev);

	switch (info) {
	case IIO_CHAN_INFO_SCALE:
	return adrf6780_spi_write(st, ADRF6780_REG_LINEARIZE, val);
	case IIO_CHAN_INFO_PHASE:
	switch (chan->channel2) {
	case IIO_MOD_I:
	return adrf6780_spi_update_bits(st,
	ADRF6780_REG_LO_PATH,
	ADRF6780_I_PATH_PHASE_ACCURACY_MSK,
	FIELD_PREP(ADRF6780_I_PATH_PHASE_ACCURACY_MSK, val));
	case IIO_MOD_Q:
	return adrf6780_spi_update_bits(st,
	ADRF6780_REG_LO_PATH,
	ADRF6780_Q_PATH_PHASE_ACCURACY_MSK,
	FIELD_PREP(ADRF6780_Q_PATH_PHASE_ACCURACY_MSK, val));
	default:
	return -EINVAL;
	}
	default:
	return -EINVAL;
	}
	}

	static int adrf6780_reg_access(struct iio_dev *indio_dev,
	unsigned int reg,
	unsigned int write_val,
	unsigned int *read_val)
	{
	struct adrf6780_state *st = iio_priv(indio_dev);

	if (read_val)
	return adrf6780_spi_read(st, reg, read_val);
	else
	return adrf6780_spi_write(st, reg, write_val);
	}

	static const struct iio_info adrf6780_info = {
	.read_raw = adrf6780_read_raw,
	.write_raw = adrf6780_write_raw,
	.debugfs_reg_access = &adrf6780_reg_access,
	};

	#define ADRF6780_CHAN_ADC(_channel) { \
	.type = IIO_ALTVOLTAGE, \
	.output = 0, \
	.indexed = 1, \
	.channel = _channel, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \
	}

	#define ADRF6780_CHAN_RDAC(_channel) { \
	.type = IIO_ALTVOLTAGE, \
	.output = 1, \
	.indexed = 1, \
	.channel = _channel, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_SCALE) \
	}

	#define ADRF6780_CHAN_IQ_PHASE(_channel, rf_comp) { \
	.type = IIO_ALTVOLTAGE, \
	.modified = 1, \
	.output = 1, \
	.indexed = 1, \
	.channel2 = IIO_MOD_##rf_comp, \
	.channel = _channel, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_PHASE) \
	}

	static const struct iio_chan_spec adrf6780_channels[] = {
	ADRF6780_CHAN_ADC(0),
	ADRF6780_CHAN_RDAC(0),
	ADRF6780_CHAN_IQ_PHASE(0, I),
	ADRF6780_CHAN_IQ_PHASE(0, Q),
	};

	static int adrf6780_reset(struct adrf6780_state *st)
	{
	int ret;
	struct spi_device *spi = st->spi;

	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_CONTROL,
	ADRF6780_SOFT_RESET_MSK,
	FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 1));
	if (ret) {
	dev_err(&spi->dev, "ADRF6780 SPI software reset failed.\n");
	return ret;
	}

	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_CONTROL,
	ADRF6780_SOFT_RESET_MSK,
	FIELD_PREP(ADRF6780_SOFT_RESET_MSK, 0));
	if (ret) {
	dev_err(&spi->dev, "ADRF6780 SPI software reset disable failed.\n");
	return ret;
	}

	return 0;
	}

	static int adrf6780_init(struct adrf6780_state *st)
	{
	int ret;
	unsigned int chip_id, enable_reg, enable_reg_msk;
	struct spi_device *spi = st->spi;

	/* Perform a software reset */
	ret = adrf6780_reset(st);
	if (ret)
	return ret;

	ret = __adrf6780_spi_read(st, ADRF6780_REG_CONTROL, &chip_id);
	if (ret)
	return ret;

	chip_id = FIELD_GET(ADRF6780_CHIP_ID_MSK, chip_id);
	if (chip_id != ADRF6780_CHIP_ID) {
	dev_err(&spi->dev, "ADRF6780 Invalid Chip ID.\n");
	return -EINVAL;
	}

	enable_reg_msk = ADRF6780_VGA_BUFFER_EN_MSK \|
	ADRF6780_DETECTOR_EN_MSK \|
	ADRF6780_LO_BUFFER_EN_MSK \|
	ADRF6780_IF_MODE_EN_MSK \|
	ADRF6780_IQ_MODE_EN_MSK \|
	ADRF6780_LO_X2_EN_MSK \|
	ADRF6780_LO_PPF_EN_MSK \|
	ADRF6780_LO_EN_MSK \|
	ADRF6780_UC_BIAS_EN_MSK;

	enable_reg = FIELD_PREP(ADRF6780_VGA_BUFFER_EN_MSK, st->vga_buff_en) \|
	FIELD_PREP(ADRF6780_DETECTOR_EN_MSK, 1) \|
	FIELD_PREP(ADRF6780_LO_BUFFER_EN_MSK, st->lo_buff_en) \|
	FIELD_PREP(ADRF6780_IF_MODE_EN_MSK, st->if_mode_en) \|
	FIELD_PREP(ADRF6780_IQ_MODE_EN_MSK, st->iq_mode_en) \|
	FIELD_PREP(ADRF6780_LO_X2_EN_MSK, st->lo_x2_en) \|
	FIELD_PREP(ADRF6780_LO_PPF_EN_MSK, st->lo_ppf_en) \|
	FIELD_PREP(ADRF6780_LO_EN_MSK, st->lo_en) \|
	FIELD_PREP(ADRF6780_UC_BIAS_EN_MSK, st->uc_bias_en);

	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_ENABLE,
	enable_reg_msk, enable_reg);
	if (ret)
	return ret;

	ret = __adrf6780_spi_update_bits(st, ADRF6780_REG_LO_PATH,
	ADRF6780_LO_SIDEBAND_MSK,
	FIELD_PREP(ADRF6780_LO_SIDEBAND_MSK, st->lo_sideband));
	if (ret)
	return ret;

	return __adrf6780_spi_update_bits(st, ADRF6780_REG_ADC_CONTROL,
	ADRF6780_VDET_OUTPUT_SELECT_MSK,
	FIELD_PREP(ADRF6780_VDET_OUTPUT_SELECT_MSK, st->vdet_out_en));
	}

	static void adrf6780_properties_parse(struct adrf6780_state *st)
	{
	struct spi_device *spi = st->spi;

	st->vga_buff_en = device_property_read_bool(&spi->dev, "adi,vga-buff-en");
	st->lo_buff_en = device_property_read_bool(&spi->dev, "adi,lo-buff-en");
	st->if_mode_en = device_property_read_bool(&spi->dev, "adi,if-mode-en");
	st->iq_mode_en = device_property_read_bool(&spi->dev, "adi,iq-mode-en");
	st->lo_x2_en = device_property_read_bool(&spi->dev, "adi,lo-x2-en");
	st->lo_ppf_en = device_property_read_bool(&spi->dev, "adi,lo-ppf-en");
	st->lo_en = device_property_read_bool(&spi->dev, "adi,lo-en");
	st->uc_bias_en = device_property_read_bool(&spi->dev, "adi,uc-bias-en");
	st->lo_sideband = device_property_read_bool(&spi->dev, "adi,lo-sideband");
	st->vdet_out_en = device_property_read_bool(&spi->dev, "adi,vdet-out-en");
	}

	static void adrf6780_clk_disable(void *data)
	{
	clk_disable_unprepare(data);
	}

	static void adrf6780_powerdown(void *data)
	{
	/* Disable all components in the Enable Register */
	adrf6780_spi_write(data, ADRF6780_REG_ENABLE, 0x0);
	}

	static int adrf6780_probe(struct spi_device *spi)
	{
	struct iio_dev *indio_dev;
	struct adrf6780_state *st;
	int ret;

	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
	if (!indio_dev)
	return -ENOMEM;

	st = iio_priv(indio_dev);

	indio_dev->info = &adrf6780_info;
	indio_dev->name = "adrf6780";
	indio_dev->channels = adrf6780_channels;
	indio_dev->num_channels = ARRAY_SIZE(adrf6780_channels);

	st->spi = spi;

	adrf6780_properties_parse(st);

	st->clkin = devm_clk_get(&spi->dev, "lo_in");
	if (IS_ERR(st->clkin))
	return dev_err_probe(&spi->dev, PTR_ERR(st->clkin),
	"failed to get the LO input clock\n");

	ret = clk_prepare_enable(st->clkin);
	if (ret)
	return ret;

	ret = devm_add_action_or_reset(&spi->dev, adrf6780_clk_disable,
	st->clkin);
	if (ret)
	return ret;

	mutex_init(&st->lock);

	ret = adrf6780_init(st);
	if (ret)
	return ret;

	ret = devm_add_action_or_reset(&spi->dev, adrf6780_powerdown, st);
	if (ret)
	return ret;

	return devm_iio_device_register(&spi->dev, indio_dev);
	}

	static const struct spi_device_id adrf6780_id[] = {
	{ "adrf6780", 0 },
	{}
	};
	MODULE_DEVICE_TABLE(spi, adrf6780_id);

	static const struct of_device_id adrf6780_of_match[] = {
	{ .compatible = "adi,adrf6780" },
	{}
	};
	MODULE_DEVICE_TABLE(of, adrf6780_of_match);

	static struct spi_driver adrf6780_driver = {
	.driver = {
	.name = "adrf6780",
	.of_match_table = adrf6780_of_match,
	},
	.probe = adrf6780_probe,
	.id_table = adrf6780_id,
	};
	module_spi_driver(adrf6780_driver);

	MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com");
	MODULE_DESCRIPTION("Analog Devices ADRF6780");
	MODULE_LICENSE("GPL v2");