drivers/iio/adc/ad7606_spi.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * AD7606 SPI ADC driver
  *
  * Copyright 2011 Analog Devices Inc.
  */

 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/spi/spi.h>
 #include <linux/types.h>

 #include <linux/iio/iio.h>
 #include "ad7606.h"

 #define MAX_SPI_FREQ_HZ		23500000	/* VDRIVE above 4.75 V */

 #define AD7616_CONFIGURATION_REGISTER	0x02
 #define AD7616_OS_MASK			GENMASK(4, 2)
 #define AD7616_BURST_MODE		BIT(6)
 #define AD7616_SEQEN_MODE		BIT(5)
 #define AD7616_RANGE_CH_A_ADDR_OFF	0x04
 #define AD7616_RANGE_CH_B_ADDR_OFF	0x06
 /*
  * Range of channels from a group are stored in 2 registers.
  * 0, 1, 2, 3 in a register followed by 4, 5, 6, 7 in second register.
  * For channels from second group(8-15) the order is the same, only with
  * an offset of 2 for register address.
  */
 #define AD7616_RANGE_CH_ADDR(ch)	((ch) >> 2)
 /* The range of the channel is stored in 2 bits */
 #define AD7616_RANGE_CH_MSK(ch)		(0b11 << (((ch) & 0b11) * 2))
 #define AD7616_RANGE_CH_MODE(ch, mode)	((mode) << ((((ch) & 0b11)) * 2))

 #define AD7606_CONFIGURATION_REGISTER	0x02
 #define AD7606_SINGLE_DOUT		0x00

 /*
  * Range for AD7606B channels are stored in registers starting with address 0x3.
  * Each register stores range for 2 channels(4 bits per channel).
  */
 #define AD7606_RANGE_CH_MSK(ch)		(GENMASK(3, 0) << (4 * ((ch) & 0x1)))
 #define AD7606_RANGE_CH_MODE(ch, mode)	\
 	((GENMASK(3, 0) & mode) << (4 * ((ch) & 0x1)))
 #define AD7606_RANGE_CH_ADDR(ch)	(0x03 + ((ch) >> 1))
 #define AD7606_OS_MODE			0x08

 static const struct iio_chan_spec ad7616_sw_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(16),
 	AD7616_CHANNEL(0),
 	AD7616_CHANNEL(1),
 	AD7616_CHANNEL(2),
 	AD7616_CHANNEL(3),
 	AD7616_CHANNEL(4),
 	AD7616_CHANNEL(5),
 	AD7616_CHANNEL(6),
 	AD7616_CHANNEL(7),
 	AD7616_CHANNEL(8),
 	AD7616_CHANNEL(9),
 	AD7616_CHANNEL(10),
 	AD7616_CHANNEL(11),
 	AD7616_CHANNEL(12),
 	AD7616_CHANNEL(13),
 	AD7616_CHANNEL(14),
 	AD7616_CHANNEL(15),
 };

 static const struct iio_chan_spec ad7606b_sw_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(8),
 	AD7606_SW_CHANNEL(0, 16),
 	AD7606_SW_CHANNEL(1, 16),
 	AD7606_SW_CHANNEL(2, 16),
 	AD7606_SW_CHANNEL(3, 16),
 	AD7606_SW_CHANNEL(4, 16),
 	AD7606_SW_CHANNEL(5, 16),
 	AD7606_SW_CHANNEL(6, 16),
 	AD7606_SW_CHANNEL(7, 16),
 };

 static const struct iio_chan_spec ad7606c_18_sw_channels[] = {
 	IIO_CHAN_SOFT_TIMESTAMP(8),
 	AD7606_SW_CHANNEL(0, 18),
 	AD7606_SW_CHANNEL(1, 18),
 	AD7606_SW_CHANNEL(2, 18),
 	AD7606_SW_CHANNEL(3, 18),
 	AD7606_SW_CHANNEL(4, 18),
 	AD7606_SW_CHANNEL(5, 18),
 	AD7606_SW_CHANNEL(6, 18),
 	AD7606_SW_CHANNEL(7, 18),
 };

 static const unsigned int ad7606B_oversampling_avail[9] = {
 	1, 2, 4, 8, 16, 32, 64, 128, 256
 };

 static u16 ad7616_spi_rd_wr_cmd(int addr, char isWriteOp)
 {
 	/*
 	 * The address of register consist of one w/r bit
 	 * 6 bits of address followed by one reserved bit.
 	 */
 	return ((addr & 0x7F) << 1) | ((isWriteOp & 0x1) << 7);
 }

 static u16 ad7606B_spi_rd_wr_cmd(int addr, char is_write_op)
 {
 	/*
 	 * The address of register consists of one bit which
 	 * specifies a read command placed in bit 6, followed by
 	 * 6 bits of address.
 	 */
 	return (addr & 0x3F) | (((~is_write_op) & 0x1) << 6);
 }

 static int ad7606_spi_read_block(struct device *dev,
 				 int count, void *buf)
 {
 	struct spi_device *spi = to_spi_device(dev);
 	int i, ret;
 	unsigned short *data = buf;
 	__be16 *bdata = buf;

 	ret = spi_read(spi, buf, count * 2);
 	if (ret < 0) {
 		dev_err(&spi->dev, "SPI read error\n");
 		return ret;
 	}

 	for (i = 0; i < count; i++)
 		data[i] = be16_to_cpu(bdata[i]);

 	return 0;
 }

 static int ad7606_spi_read_block14to16(struct device *dev,
 				       int count, void *buf)
 {
 	struct spi_device *spi = to_spi_device(dev);
 	struct spi_transfer xfer = {
 		.bits_per_word = 14,
 		.len = count * sizeof(u16),
 		.rx_buf = buf,
 	};

 	return spi_sync_transfer(spi, &xfer, 1);
 }

 static int ad7606_spi_read_block18to32(struct device *dev,
 				       int count, void *buf)
 {
 	struct spi_device *spi = to_spi_device(dev);
 	struct spi_transfer xfer = {
 		.bits_per_word = 18,
 		.len = count * sizeof(u32),
 		.rx_buf = buf,
 	};

 	return spi_sync_transfer(spi, &xfer, 1);
 }

 static int ad7606_spi_reg_read(struct ad7606_state *st, unsigned int addr)
 {
 	struct spi_device *spi = to_spi_device(st->dev);
 	struct spi_transfer t[] = {
 		{
 			.tx_buf = &st->d16[0],
 			.len = 2,
 			.cs_change = 0,
 		}, {
 			.rx_buf = &st->d16[1],
 			.len = 2,
 		},
 	};
 	int ret;

 	st->d16[0] = cpu_to_be16(st->bops->rd_wr_cmd(addr, 0) << 8);

 	ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
 	if (ret < 0)
 		return ret;

 	return be16_to_cpu(st->d16[1]);
 }

 static int ad7606_spi_reg_write(struct ad7606_state *st,
 				unsigned int addr,
 				unsigned int val)
 {
 	struct spi_device *spi = to_spi_device(st->dev);

 	st->d16[0] = cpu_to_be16((st->bops->rd_wr_cmd(addr, 1) << 8) |
 				  (val & 0x1FF));

 	return spi_write(spi, &st->d16[0], sizeof(st->d16[0]));
 }

 static int ad7606_spi_write_mask(struct ad7606_state *st,
 				 unsigned int addr,
 				 unsigned long mask,
 				 unsigned int val)
 {
 	int readval;

 	readval = st->bops->reg_read(st, addr);
 	if (readval < 0)
 		return readval;

 	readval &= ~mask;
 	readval |= val;

 	return st->bops->reg_write(st, addr, readval);
 }

 static int ad7616_write_scale_sw(struct iio_dev *indio_dev, int ch, int val)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);
 	unsigned int ch_addr, mode, ch_index;


 	/*
 	 * Ad7616 has 16 channels divided in group A and group B.
 	 * The range of channels from A are stored in registers with address 4
 	 * while channels from B are stored in register with address 6.
 	 * The last bit from channels determines if it is from group A or B
 	 * because the order of channels in iio is 0A, 0B, 1A, 1B...
 	 */
 	ch_index = ch >> 1;

 	ch_addr = AD7616_RANGE_CH_ADDR(ch_index);

 	if ((ch & 0x1) == 0) /* channel A */
 		ch_addr += AD7616_RANGE_CH_A_ADDR_OFF;
 	else	/* channel B */
 		ch_addr += AD7616_RANGE_CH_B_ADDR_OFF;

 	/* 0b01 for 2.5v, 0b10 for 5v and 0b11 for 10v */
 	mode = AD7616_RANGE_CH_MODE(ch_index, ((val + 1) & 0b11));
 	return st->bops->write_mask(st, ch_addr, AD7616_RANGE_CH_MSK(ch_index),
 				     mode);
 }

 static int ad7616_write_os_sw(struct iio_dev *indio_dev, int val)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);

 	return st->bops->write_mask(st, AD7616_CONFIGURATION_REGISTER,
 				     AD7616_OS_MASK, val << 2);
 }

 static int ad7606_write_scale_sw(struct iio_dev *indio_dev, int ch, int val)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);

 	return ad7606_spi_write_mask(st,
 				     AD7606_RANGE_CH_ADDR(ch),
 				     AD7606_RANGE_CH_MSK(ch),
 				     AD7606_RANGE_CH_MODE(ch, val));
 }

 static int ad7606_write_os_sw(struct iio_dev *indio_dev, int val)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);

 	return ad7606_spi_reg_write(st, AD7606_OS_MODE, val);
 }

 static int ad7616_sw_mode_config(struct iio_dev *indio_dev)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);

 	/*
 	 * Scale can be configured individually for each channel
 	 * in software mode.
 	 */
 	indio_dev->channels = ad7616_sw_channels;

 	st->write_scale = ad7616_write_scale_sw;
 	st->write_os = &ad7616_write_os_sw;

 	/* Activate Burst mode and SEQEN MODE */
 	return st->bops->write_mask(st,
 			      AD7616_CONFIGURATION_REGISTER,
 			      AD7616_BURST_MODE | AD7616_SEQEN_MODE,
 			      AD7616_BURST_MODE | AD7616_SEQEN_MODE);
 }

 static int ad7606B_sw_mode_config(struct iio_dev *indio_dev)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);
 	DECLARE_BITMAP(os, 3);

 	bitmap_fill(os, 3);
 	/*
 	 * Software mode is enabled when all three oversampling
 	 * pins are set to high. If oversampling gpios are defined
 	 * in the device tree, then they need to be set to high,
 	 * otherwise, they must be hardwired to VDD
 	 */
 	if (st->gpio_os) {
 		gpiod_set_array_value(st->gpio_os->ndescs,
 				      st->gpio_os->desc, st->gpio_os->info, os);
 	}
 	/* OS of 128 and 256 are available only in software mode */
 	st->oversampling_avail = ad7606B_oversampling_avail;
 	st->num_os_ratios = ARRAY_SIZE(ad7606B_oversampling_avail);

 	st->write_scale = ad7606_write_scale_sw;
 	st->write_os = &ad7606_write_os_sw;

 	/* Configure device spi to output on a single channel */
 	st->bops->reg_write(st,
 			    AD7606_CONFIGURATION_REGISTER,
 			    AD7606_SINGLE_DOUT);

 	/*
 	 * Scale can be configured individually for each channel
 	 * in software mode.
 	 */
 	indio_dev->channels = ad7606b_sw_channels;

 	return 0;
 }

 static int ad7606c_18_sw_mode_config(struct iio_dev *indio_dev)
 {
 	int ret;

 	ret = ad7606B_sw_mode_config(indio_dev);
 	if (ret)
 		return ret;

 	indio_dev->channels = ad7606c_18_sw_channels;

 	return 0;
 }

 static const struct ad7606_bus_ops ad7606_spi_bops = {
 	.read_block = ad7606_spi_read_block,
 };

 static const struct ad7606_bus_ops ad7607_spi_bops = {
 	.read_block = ad7606_spi_read_block14to16,
 };

 static const struct ad7606_bus_ops ad7608_spi_bops = {
 	.read_block = ad7606_spi_read_block18to32,
 };

 static const struct ad7606_bus_ops ad7616_spi_bops = {
 	.read_block = ad7606_spi_read_block,
 	.reg_read = ad7606_spi_reg_read,
 	.reg_write = ad7606_spi_reg_write,
 	.write_mask = ad7606_spi_write_mask,
 	.rd_wr_cmd = ad7616_spi_rd_wr_cmd,
 	.sw_mode_config = ad7616_sw_mode_config,
 };

 static const struct ad7606_bus_ops ad7606b_spi_bops = {
 	.read_block = ad7606_spi_read_block,
 	.reg_read = ad7606_spi_reg_read,
 	.reg_write = ad7606_spi_reg_write,
 	.write_mask = ad7606_spi_write_mask,
 	.rd_wr_cmd = ad7606B_spi_rd_wr_cmd,
 	.sw_mode_config = ad7606B_sw_mode_config,
 };

 static const struct ad7606_bus_ops ad7606c_18_spi_bops = {
 	.read_block = ad7606_spi_read_block18to32,
 	.reg_read = ad7606_spi_reg_read,
 	.reg_write = ad7606_spi_reg_write,
 	.write_mask = ad7606_spi_write_mask,
 	.rd_wr_cmd = ad7606B_spi_rd_wr_cmd,
 	.sw_mode_config = ad7606c_18_sw_mode_config,
 };

 static const struct ad7606_bus_info ad7605_4_bus_info = {
 	.chip_info = &ad7605_4_info,
 	.bops = &ad7606_spi_bops,
 };

 static const struct ad7606_bus_info ad7606_8_bus_info = {
 	.chip_info = &ad7606_8_info,
 	.bops = &ad7606_spi_bops,
 };

 static const struct ad7606_bus_info ad7606_6_bus_info = {
 	.chip_info = &ad7606_6_info,
 	.bops = &ad7606_spi_bops,
 };

 static const struct ad7606_bus_info ad7606_4_bus_info = {
 	.chip_info = &ad7606_4_info,
 	.bops = &ad7606_spi_bops,
 };

 static const struct ad7606_bus_info ad7606b_bus_info = {
 	.chip_info = &ad7606b_info,
 	.bops = &ad7606b_spi_bops,
 };

 static const struct ad7606_bus_info ad7606c_16_bus_info = {
 	.chip_info = &ad7606c_16_info,
 	.bops = &ad7606b_spi_bops,
 };

 static const struct ad7606_bus_info ad7606c_18_bus_info = {
 	.chip_info = &ad7606c_18_info,
 	.bops = &ad7606c_18_spi_bops,
 };

 static const struct ad7606_bus_info ad7607_bus_info = {
 	.chip_info = &ad7607_info,
 	.bops = &ad7607_spi_bops,
 };

 static const struct ad7606_bus_info ad7608_bus_info = {
 	.chip_info = &ad7608_info,
 	.bops = &ad7608_spi_bops,
 };

 static const struct ad7606_bus_info ad7609_bus_info = {
 	.chip_info = &ad7609_info,
 	.bops = &ad7608_spi_bops,
 };

 static const struct ad7606_bus_info ad7616_bus_info = {
 	.chip_info = &ad7616_info,
 	.bops = &ad7616_spi_bops,
 };

 static int ad7606_spi_probe(struct spi_device *spi)
 {
 	const struct ad7606_bus_info *bus_info = spi_get_device_match_data(spi);

 	return ad7606_probe(&spi->dev, spi->irq, NULL,
 			    bus_info->chip_info, bus_info->bops);
 }

 static const struct spi_device_id ad7606_id_table[] = {
 	{ "ad7605-4", (kernel_ulong_t)&ad7605_4_bus_info },
 	{ "ad7606-4", (kernel_ulong_t)&ad7606_4_bus_info },
 	{ "ad7606-6", (kernel_ulong_t)&ad7606_6_bus_info },
 	{ "ad7606-8", (kernel_ulong_t)&ad7606_8_bus_info },
 	{ "ad7606b",  (kernel_ulong_t)&ad7606b_bus_info },
 	{ "ad7606c-16", (kernel_ulong_t)&ad7606c_16_bus_info },
 	{ "ad7606c-18", (kernel_ulong_t)&ad7606c_18_bus_info },
 	{ "ad7607",   (kernel_ulong_t)&ad7607_bus_info },
 	{ "ad7608",   (kernel_ulong_t)&ad7608_bus_info },
 	{ "ad7609",   (kernel_ulong_t)&ad7609_bus_info },
 	{ "ad7616",   (kernel_ulong_t)&ad7616_bus_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, ad7606_id_table);

 static const struct of_device_id ad7606_of_match[] = {
 	{ .compatible = "adi,ad7605-4", .data = &ad7605_4_bus_info },
 	{ .compatible = "adi,ad7606-4", .data = &ad7606_4_bus_info },
 	{ .compatible = "adi,ad7606-6", .data = &ad7606_6_bus_info },
 	{ .compatible = "adi,ad7606-8", .data = &ad7606_8_bus_info },
 	{ .compatible = "adi,ad7606b", .data = &ad7606b_bus_info },
 	{ .compatible = "adi,ad7606c-16", .data = &ad7606c_16_bus_info },
 	{ .compatible = "adi,ad7606c-18", .data = &ad7606c_18_bus_info },
 	{ .compatible = "adi,ad7607", .data = &ad7607_bus_info },
 	{ .compatible = "adi,ad7608", .data = &ad7608_bus_info },
 	{ .compatible = "adi,ad7609", .data = &ad7609_bus_info },
 	{ .compatible = "adi,ad7616", .data = &ad7616_bus_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ad7606_of_match);

 static struct spi_driver ad7606_driver = {
 	.driver = {
 		.name = "ad7606",
 		.of_match_table = ad7606_of_match,
 		.pm = AD7606_PM_OPS,
 	},
 	.probe = ad7606_spi_probe,
 	.id_table = ad7606_id_table,
 };
 module_spi_driver(ad7606_driver);

 MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
 MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
 MODULE_LICENSE("GPL v2");
 MODULE_IMPORT_NS("IIO_AD7606");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* AD7606 SPI ADC driver
	*
	* Copyright 2011 Analog Devices Inc.
	*/

	#include <linux/err.h>
	#include <linux/module.h>
	#include <linux/spi/spi.h>
	#include <linux/types.h>

	#include <linux/iio/iio.h>
	#include "ad7606.h"

	#define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */

	#define AD7616_CONFIGURATION_REGISTER 0x02
	#define AD7616_OS_MASK GENMASK(4, 2)
	#define AD7616_BURST_MODE BIT(6)
	#define AD7616_SEQEN_MODE BIT(5)
	#define AD7616_RANGE_CH_A_ADDR_OFF 0x04
	#define AD7616_RANGE_CH_B_ADDR_OFF 0x06
	/*
	* Range of channels from a group are stored in 2 registers.
	* 0, 1, 2, 3 in a register followed by 4, 5, 6, 7 in second register.
	* For channels from second group(8-15) the order is the same, only with
	* an offset of 2 for register address.
	*/
	#define AD7616_RANGE_CH_ADDR(ch) ((ch) >> 2)
	/* The range of the channel is stored in 2 bits */
	#define AD7616_RANGE_CH_MSK(ch) (0b11 << (((ch) & 0b11) * 2))
	#define AD7616_RANGE_CH_MODE(ch, mode) ((mode) << ((((ch) & 0b11)) * 2))

	#define AD7606_CONFIGURATION_REGISTER 0x02
	#define AD7606_SINGLE_DOUT 0x00

	/*
	* Range for AD7606B channels are stored in registers starting with address 0x3.
	* Each register stores range for 2 channels(4 bits per channel).
	*/
	#define AD7606_RANGE_CH_MSK(ch) (GENMASK(3, 0) << (4 * ((ch) & 0x1)))
	#define AD7606_RANGE_CH_MODE(ch, mode) \
	((GENMASK(3, 0) & mode) << (4 * ((ch) & 0x1)))
	#define AD7606_RANGE_CH_ADDR(ch) (0x03 + ((ch) >> 1))
	#define AD7606_OS_MODE 0x08

	static const struct iio_chan_spec ad7616_sw_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(16),
	AD7616_CHANNEL(0),
	AD7616_CHANNEL(1),
	AD7616_CHANNEL(2),
	AD7616_CHANNEL(3),
	AD7616_CHANNEL(4),
	AD7616_CHANNEL(5),
	AD7616_CHANNEL(6),
	AD7616_CHANNEL(7),
	AD7616_CHANNEL(8),
	AD7616_CHANNEL(9),
	AD7616_CHANNEL(10),
	AD7616_CHANNEL(11),
	AD7616_CHANNEL(12),
	AD7616_CHANNEL(13),
	AD7616_CHANNEL(14),
	AD7616_CHANNEL(15),
	};

	static const struct iio_chan_spec ad7606b_sw_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(8),
	AD7606_SW_CHANNEL(0, 16),
	AD7606_SW_CHANNEL(1, 16),
	AD7606_SW_CHANNEL(2, 16),
	AD7606_SW_CHANNEL(3, 16),
	AD7606_SW_CHANNEL(4, 16),
	AD7606_SW_CHANNEL(5, 16),
	AD7606_SW_CHANNEL(6, 16),
	AD7606_SW_CHANNEL(7, 16),
	};

	static const struct iio_chan_spec ad7606c_18_sw_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(8),
	AD7606_SW_CHANNEL(0, 18),
	AD7606_SW_CHANNEL(1, 18),
	AD7606_SW_CHANNEL(2, 18),
	AD7606_SW_CHANNEL(3, 18),
	AD7606_SW_CHANNEL(4, 18),
	AD7606_SW_CHANNEL(5, 18),
	AD7606_SW_CHANNEL(6, 18),
	AD7606_SW_CHANNEL(7, 18),
	};

	static const unsigned int ad7606B_oversampling_avail[9] = {
	1, 2, 4, 8, 16, 32, 64, 128, 256
	};

	static u16 ad7616_spi_rd_wr_cmd(int addr, char isWriteOp)
	{
	/*
	* The address of register consist of one w/r bit
	* 6 bits of address followed by one reserved bit.
	*/
	return ((addr & 0x7F) << 1) \| ((isWriteOp & 0x1) << 7);
	}

	static u16 ad7606B_spi_rd_wr_cmd(int addr, char is_write_op)
	{
	/*
	* The address of register consists of one bit which
	* specifies a read command placed in bit 6, followed by
	* 6 bits of address.
	*/
	return (addr & 0x3F) \| (((~is_write_op) & 0x1) << 6);
	}

	static int ad7606_spi_read_block(struct device *dev,
	int count, void *buf)
	{
	struct spi_device *spi = to_spi_device(dev);
	int i, ret;
	unsigned short *data = buf;
	__be16 *bdata = buf;

	ret = spi_read(spi, buf, count * 2);
	if (ret < 0) {
	dev_err(&spi->dev, "SPI read error\n");
	return ret;
	}

	for (i = 0; i < count; i++)
	data[i] = be16_to_cpu(bdata[i]);

	return 0;
	}

	static int ad7606_spi_read_block14to16(struct device *dev,
	int count, void *buf)
	{
	struct spi_device *spi = to_spi_device(dev);
	struct spi_transfer xfer = {
	.bits_per_word = 14,
	.len = count * sizeof(u16),
	.rx_buf = buf,
	};

	return spi_sync_transfer(spi, &xfer, 1);
	}

	static int ad7606_spi_read_block18to32(struct device *dev,
	int count, void *buf)
	{
	struct spi_device *spi = to_spi_device(dev);
	struct spi_transfer xfer = {
	.bits_per_word = 18,
	.len = count * sizeof(u32),
	.rx_buf = buf,
	};

	return spi_sync_transfer(spi, &xfer, 1);
	}

	static int ad7606_spi_reg_read(struct ad7606_state *st, unsigned int addr)
	{
	struct spi_device *spi = to_spi_device(st->dev);
	struct spi_transfer t[] = {
	{
	.tx_buf = &st->d16[0],
	.len = 2,
	.cs_change = 0,
	}, {
	.rx_buf = &st->d16[1],
	.len = 2,
	},
	};
	int ret;

	st->d16[0] = cpu_to_be16(st->bops->rd_wr_cmd(addr, 0) << 8);

	ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
	if (ret < 0)
	return ret;

	return be16_to_cpu(st->d16[1]);
	}

	static int ad7606_spi_reg_write(struct ad7606_state *st,
	unsigned int addr,
	unsigned int val)
	{
	struct spi_device *spi = to_spi_device(st->dev);

	st->d16[0] = cpu_to_be16((st->bops->rd_wr_cmd(addr, 1) << 8) \|
	(val & 0x1FF));

	return spi_write(spi, &st->d16[0], sizeof(st->d16[0]));
	}

	static int ad7606_spi_write_mask(struct ad7606_state *st,
	unsigned int addr,
	unsigned long mask,
	unsigned int val)
	{
	int readval;

	readval = st->bops->reg_read(st, addr);
	if (readval < 0)
	return readval;

	readval &= ~mask;
	readval \|= val;

	return st->bops->reg_write(st, addr, readval);
	}

	static int ad7616_write_scale_sw(struct iio_dev *indio_dev, int ch, int val)
	{
	struct ad7606_state *st = iio_priv(indio_dev);
	unsigned int ch_addr, mode, ch_index;


	/*
	* Ad7616 has 16 channels divided in group A and group B.
	* The range of channels from A are stored in registers with address 4
	* while channels from B are stored in register with address 6.
	* The last bit from channels determines if it is from group A or B
	* because the order of channels in iio is 0A, 0B, 1A, 1B...
	*/
	ch_index = ch >> 1;

	ch_addr = AD7616_RANGE_CH_ADDR(ch_index);

	if ((ch & 0x1) == 0) /* channel A */
	ch_addr += AD7616_RANGE_CH_A_ADDR_OFF;
	else /* channel B */
	ch_addr += AD7616_RANGE_CH_B_ADDR_OFF;

	/* 0b01 for 2.5v, 0b10 for 5v and 0b11 for 10v */
	mode = AD7616_RANGE_CH_MODE(ch_index, ((val + 1) & 0b11));
	return st->bops->write_mask(st, ch_addr, AD7616_RANGE_CH_MSK(ch_index),
	mode);
	}

	static int ad7616_write_os_sw(struct iio_dev *indio_dev, int val)
	{
	struct ad7606_state *st = iio_priv(indio_dev);

	return st->bops->write_mask(st, AD7616_CONFIGURATION_REGISTER,
	AD7616_OS_MASK, val << 2);
	}

	static int ad7606_write_scale_sw(struct iio_dev *indio_dev, int ch, int val)
	{
	struct ad7606_state *st = iio_priv(indio_dev);

	return ad7606_spi_write_mask(st,
	AD7606_RANGE_CH_ADDR(ch),
	AD7606_RANGE_CH_MSK(ch),
	AD7606_RANGE_CH_MODE(ch, val));
	}

	static int ad7606_write_os_sw(struct iio_dev *indio_dev, int val)
	{
	struct ad7606_state *st = iio_priv(indio_dev);

	return ad7606_spi_reg_write(st, AD7606_OS_MODE, val);
	}

	static int ad7616_sw_mode_config(struct iio_dev *indio_dev)
	{
	struct ad7606_state *st = iio_priv(indio_dev);

	/*
	* Scale can be configured individually for each channel
	* in software mode.
	*/
	indio_dev->channels = ad7616_sw_channels;

	st->write_scale = ad7616_write_scale_sw;
	st->write_os = &ad7616_write_os_sw;

	/* Activate Burst mode and SEQEN MODE */
	return st->bops->write_mask(st,
	AD7616_CONFIGURATION_REGISTER,
	AD7616_BURST_MODE \| AD7616_SEQEN_MODE,
	AD7616_BURST_MODE \| AD7616_SEQEN_MODE);
	}

	static int ad7606B_sw_mode_config(struct iio_dev *indio_dev)
	{
	struct ad7606_state *st = iio_priv(indio_dev);
	DECLARE_BITMAP(os, 3);

	bitmap_fill(os, 3);
	/*
	* Software mode is enabled when all three oversampling
	* pins are set to high. If oversampling gpios are defined
	* in the device tree, then they need to be set to high,
	* otherwise, they must be hardwired to VDD
	*/
	if (st->gpio_os) {
	gpiod_set_array_value(st->gpio_os->ndescs,
	st->gpio_os->desc, st->gpio_os->info, os);
	}
	/* OS of 128 and 256 are available only in software mode */
	st->oversampling_avail = ad7606B_oversampling_avail;
	st->num_os_ratios = ARRAY_SIZE(ad7606B_oversampling_avail);

	st->write_scale = ad7606_write_scale_sw;
	st->write_os = &ad7606_write_os_sw;

	/* Configure device spi to output on a single channel */
	st->bops->reg_write(st,
	AD7606_CONFIGURATION_REGISTER,
	AD7606_SINGLE_DOUT);

	/*
	* Scale can be configured individually for each channel
	* in software mode.
	*/
	indio_dev->channels = ad7606b_sw_channels;

	return 0;
	}

	static int ad7606c_18_sw_mode_config(struct iio_dev *indio_dev)
	{
	int ret;

	ret = ad7606B_sw_mode_config(indio_dev);
	if (ret)
	return ret;

	indio_dev->channels = ad7606c_18_sw_channels;

	return 0;
	}

	static const struct ad7606_bus_ops ad7606_spi_bops = {
	.read_block = ad7606_spi_read_block,
	};

	static const struct ad7606_bus_ops ad7607_spi_bops = {
	.read_block = ad7606_spi_read_block14to16,
	};

	static const struct ad7606_bus_ops ad7608_spi_bops = {
	.read_block = ad7606_spi_read_block18to32,
	};

	static const struct ad7606_bus_ops ad7616_spi_bops = {
	.read_block = ad7606_spi_read_block,
	.reg_read = ad7606_spi_reg_read,
	.reg_write = ad7606_spi_reg_write,
	.write_mask = ad7606_spi_write_mask,
	.rd_wr_cmd = ad7616_spi_rd_wr_cmd,
	.sw_mode_config = ad7616_sw_mode_config,
	};

	static const struct ad7606_bus_ops ad7606b_spi_bops = {
	.read_block = ad7606_spi_read_block,
	.reg_read = ad7606_spi_reg_read,
	.reg_write = ad7606_spi_reg_write,
	.write_mask = ad7606_spi_write_mask,
	.rd_wr_cmd = ad7606B_spi_rd_wr_cmd,
	.sw_mode_config = ad7606B_sw_mode_config,
	};

	static const struct ad7606_bus_ops ad7606c_18_spi_bops = {
	.read_block = ad7606_spi_read_block18to32,
	.reg_read = ad7606_spi_reg_read,
	.reg_write = ad7606_spi_reg_write,
	.write_mask = ad7606_spi_write_mask,
	.rd_wr_cmd = ad7606B_spi_rd_wr_cmd,
	.sw_mode_config = ad7606c_18_sw_mode_config,
	};

	static const struct ad7606_bus_info ad7605_4_bus_info = {
	.chip_info = &ad7605_4_info,
	.bops = &ad7606_spi_bops,
	};

	static const struct ad7606_bus_info ad7606_8_bus_info = {
	.chip_info = &ad7606_8_info,
	.bops = &ad7606_spi_bops,
	};

	static const struct ad7606_bus_info ad7606_6_bus_info = {
	.chip_info = &ad7606_6_info,
	.bops = &ad7606_spi_bops,
	};

	static const struct ad7606_bus_info ad7606_4_bus_info = {
	.chip_info = &ad7606_4_info,
	.bops = &ad7606_spi_bops,
	};

	static const struct ad7606_bus_info ad7606b_bus_info = {
	.chip_info = &ad7606b_info,
	.bops = &ad7606b_spi_bops,
	};

	static const struct ad7606_bus_info ad7606c_16_bus_info = {
	.chip_info = &ad7606c_16_info,
	.bops = &ad7606b_spi_bops,
	};

	static const struct ad7606_bus_info ad7606c_18_bus_info = {
	.chip_info = &ad7606c_18_info,
	.bops = &ad7606c_18_spi_bops,
	};

	static const struct ad7606_bus_info ad7607_bus_info = {
	.chip_info = &ad7607_info,
	.bops = &ad7607_spi_bops,
	};

	static const struct ad7606_bus_info ad7608_bus_info = {
	.chip_info = &ad7608_info,
	.bops = &ad7608_spi_bops,
	};

	static const struct ad7606_bus_info ad7609_bus_info = {
	.chip_info = &ad7609_info,
	.bops = &ad7608_spi_bops,
	};

	static const struct ad7606_bus_info ad7616_bus_info = {
	.chip_info = &ad7616_info,
	.bops = &ad7616_spi_bops,
	};

	static int ad7606_spi_probe(struct spi_device *spi)
	{
	const struct ad7606_bus_info *bus_info = spi_get_device_match_data(spi);

	return ad7606_probe(&spi->dev, spi->irq, NULL,
	bus_info->chip_info, bus_info->bops);
	}

	static const struct spi_device_id ad7606_id_table[] = {
	{ "ad7605-4", (kernel_ulong_t)&ad7605_4_bus_info },
	{ "ad7606-4", (kernel_ulong_t)&ad7606_4_bus_info },
	{ "ad7606-6", (kernel_ulong_t)&ad7606_6_bus_info },
	{ "ad7606-8", (kernel_ulong_t)&ad7606_8_bus_info },
	{ "ad7606b", (kernel_ulong_t)&ad7606b_bus_info },
	{ "ad7606c-16", (kernel_ulong_t)&ad7606c_16_bus_info },
	{ "ad7606c-18", (kernel_ulong_t)&ad7606c_18_bus_info },
	{ "ad7607", (kernel_ulong_t)&ad7607_bus_info },
	{ "ad7608", (kernel_ulong_t)&ad7608_bus_info },
	{ "ad7609", (kernel_ulong_t)&ad7609_bus_info },
	{ "ad7616", (kernel_ulong_t)&ad7616_bus_info },
	{ }
	};
	MODULE_DEVICE_TABLE(spi, ad7606_id_table);

	static const struct of_device_id ad7606_of_match[] = {
	{ .compatible = "adi,ad7605-4", .data = &ad7605_4_bus_info },
	{ .compatible = "adi,ad7606-4", .data = &ad7606_4_bus_info },
	{ .compatible = "adi,ad7606-6", .data = &ad7606_6_bus_info },
	{ .compatible = "adi,ad7606-8", .data = &ad7606_8_bus_info },
	{ .compatible = "adi,ad7606b", .data = &ad7606b_bus_info },
	{ .compatible = "adi,ad7606c-16", .data = &ad7606c_16_bus_info },
	{ .compatible = "adi,ad7606c-18", .data = &ad7606c_18_bus_info },
	{ .compatible = "adi,ad7607", .data = &ad7607_bus_info },
	{ .compatible = "adi,ad7608", .data = &ad7608_bus_info },
	{ .compatible = "adi,ad7609", .data = &ad7609_bus_info },
	{ .compatible = "adi,ad7616", .data = &ad7616_bus_info },
	{ }
	};
	MODULE_DEVICE_TABLE(of, ad7606_of_match);

	static struct spi_driver ad7606_driver = {
	.driver = {
	.name = "ad7606",
	.of_match_table = ad7606_of_match,
	.pm = AD7606_PM_OPS,
	},
	.probe = ad7606_spi_probe,
	.id_table = ad7606_id_table,
	};
	module_spi_driver(ad7606_driver);

	MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
	MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
	MODULE_LICENSE("GPL v2");
	MODULE_IMPORT_NS("IIO_AD7606");