FFT not working in AD7606B

Hi,

we have build a linux driver code and HDL code for AD7606B serial interface. the design is working and we are getting ADC data correctly in IIoscope. we have given 1vpp sine wave and in response we are getting a sine wave on IIoscope with max value at around 3200 (Vcc =5V,  so 32768*0.5/5) so time domain is working. But when try to plot same signal in Frequency domain we are not getting spectrum image properly, issue is when we use show singleton market option the Fundamental frequency is at 5Hz and whereas harmonics are in multiple of 5Hz.

but actually sine wave input is 10Khz, so FFT is wrongly plotting on IIoscope. so can we please help us on this issue. which parameter in code or driver for IIO affects the FFT plotting. what we need to check or change in the code. Note , we are using axi_adc_core in probing function on top of ad7606b.c driver.

attached driver code file 

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

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/util_macros.h>

#include <linux/spi/spi.h>

#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>

#include <linux/iio/buffer_impl.h>
#include <linux/iio/buffer-dma.h>
#include <linux/iio/buffer-dmaengine.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>

#include "ad7606.h"
#include "cf_axi_adc.h"



#define AD7606_OUTPUT_MODE_TWOS_COMPLEMENT	0x01

uint8_t exec = 0;

/*
 * Scales are computed as 5000/32768 and 10000/32768 respectively,
 * so that when applied to the raw values they provide mV values
 */
static const unsigned int ad7606_scale_avail[2] = {
	152588, 305176
};

static const unsigned int ad7606B_scale_avail[3] = {
	76293, 152588, 305176
};

static const unsigned int ad7606_oversampling_avail[7] = {
	1, 2, 4, 8, 16, 32, 64,
};

static const unsigned int ad7616_oversampling_avail[8] = {
	1, 2, 4, 8, 16, 32, 64, 128,
};

static const struct axiadc_chip_info conv_chip_info = {
	.name = "ad7606_axi_adc",
	.max_rate = 800000UL,
	.num_channels = 8,
	.channel[0] = AD7606B_CHANNEL(0),
	.channel[1] = AD7606B_CHANNEL(1),
	.channel[2] = AD7606B_CHANNEL(2),
	.channel[3] = AD7606B_CHANNEL(3),
	.channel[4] = AD7606B_CHANNEL(4),
	.channel[5] = AD7606B_CHANNEL(5),
	.channel[6] = AD7606B_CHANNEL(6),
	.channel[7] = AD7606B_CHANNEL(7),
};

static int ad7606_reset(struct ad7606_state *st)
{
	if (st->gpio_reset) {
		gpiod_set_value(st->gpio_reset, 1);
		ndelay(100); /* t_reset >= 100ns */
		gpiod_set_value(st->gpio_reset, 0);
		return 0;
	}

	return -ENODEV;
}

static bool ad7606_has_axi_adc(struct device *dev)
{
	return device_property_present(dev, "spibus-connected");
}

static struct ad7606_state *ad7606_get_data(struct iio_dev *indio_dev)
{
	struct axiadc_converter *conv;

	if (ad7606_has_axi_adc(&indio_dev->dev)) {
		/* AXI ADC*/
		conv = iio_device_get_drvdata(indio_dev);
		return conv->phy;
	} else {
		return iio_priv(indio_dev);
	}
}

static int ad7606_buffer_postenable(struct iio_dev *indio_dev)
{
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	int ret=0;
	exec = 1;
	ret =st->bops->offload_enable(st);
	return 0;
}

static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
{
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	int ret=0;
	ret =st->bops->offload_disable(st);
	exec =0;
	return 0;
}

static int ad7606_reg_access(struct iio_dev *indio_dev,
			     unsigned int reg,
			     unsigned int writeval,
			     unsigned int *readval)
{
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	int ret=0;
	
	if (exec){
		ad7606_buffer_predisable(indio_dev);
	}	

	mutex_lock(&st->lock);
	if (readval) {
		ret = st->bops->reg_read(st, reg);
		if (ret < 0)
			goto err_unlock;
		*readval = ret;
		ret = 0;
	} else {
		ret = st->bops->reg_write(st, reg, writeval);
	}

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

static int ad7606_read_samples(struct ad7606_state *st)
{
	unsigned int num = st->chip_info->num_channels - 1;
	u16 *data;
	return st->bops->read_block(st, num, data);
}

static irqreturn_t ad7606_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	int ret;

	mutex_lock(&st->lock);

	ret = ad7606_read_samples(st);
	if (ret == 0)
		iio_push_to_buffers_with_timestamp(indio_dev, st->data,
						   iio_get_time_ns(indio_dev));

	iio_trigger_notify_done(indio_dev->trig);
	/* The rising edge of the CONVST signal starts a new conversion. */
	gpiod_set_value(st->gpio_convst, 1);

	mutex_unlock(&st->lock);

	return IRQ_HANDLED;
}

static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
{
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	int ret;u16 *data = st->data;
	if (exec){
		ad7606_buffer_predisable(indio_dev);
	}

	ret = wait_for_completion_timeout(&st->completion,
					  msecs_to_jiffies(1000));
	if (!ret) {
		ret = -ETIMEDOUT;
		//goto error_ret;
	}
	int i;
	ret = ad7606_read_samples(st);
	if (ret == 0)
		ret = st->data[2+ch];

error_ret:
	return ret;
	return ret;
}

static int ad7606_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val,
			   int *val2,
			   long m)
{
	int ret, ch = 0;
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	
	switch (m) {
	case IIO_CHAN_INFO_RAW:
		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
			return ret;

		ret = ad7606_scan_direct(indio_dev, chan->address);
		iio_device_release_direct_mode(indio_dev);

		if (ret < 0)
			return ret;
		*val = (short)ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		if (st->sw_mode_en)
			ch = chan->address;
		*val = 0;
		*val2 = st->scale_avail[st->range[ch]];
		//*val2 = st->scale_avail[1];
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
		*val = st->oversampling;
		return IIO_VAL_INT;
	}
	return -EINVAL;
}

static ssize_t ad7606_show_avail(char *buf, const unsigned int *vals,
				 unsigned int n, bool micros)
{
	size_t len = 0;
	int i;

	for (i = 0; i < n; i++) {
		len += scnprintf(buf + len, PAGE_SIZE - len,
			micros ? "0.%06u " : "%u ", vals[i]);
	}
	buf[len - 1] = '\n';

	return len;
}

static ssize_t in_voltage_scale_available_show(struct device *dev,
					       struct device_attribute *attr,
					       char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ad7606_state *st = iio_priv(indio_dev);

	return ad7606_show_avail(buf, st->scale_avail, st->num_scales, true);
}

static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);

static int ad7606_write_scale_hw(struct iio_dev *indio_dev, int ch, int val)
{
	struct ad7606_state *st = iio_priv(indio_dev);
	gpiod_set_value(st->gpio_range, val);

	return 0;
}

static int ad7606_write_os_hw(struct iio_dev *indio_dev, int val)
{
	struct ad7606_state *st = iio_priv(indio_dev);
	int values[3];

	values[0] = (val >> 0) & 1;
	values[1] = (val >> 1) & 1;
	values[2] = (val >> 2) & 1;

	gpiod_set_array_value(ARRAY_SIZE(values),
			      st->gpio_os->desc, values);

	/* AD7616 requires a reset to update value */
	if (st->chip_info->os_req_reset)
		ad7606_reset(st);

	return 0;
}

static int ad7606_write_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int val,
			    int val2,
			    long mask)
{
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	int i, ret, ch = 0;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		mutex_lock(&st->lock);
		i = find_closest(val2, st->scale_avail, st->num_scales);
		if (st->sw_mode_en)
			ch = chan->address;
		ret = st->write_scale(indio_dev, ch, i);
		if (ret < 0) {
			mutex_unlock(&st->lock);
			return ret;
		}
		st->range[ch] = i;
		mutex_unlock(&st->lock);

		return 0;
	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
		if (val2)
			return -EINVAL;

		i = find_closest(val, st->oversampling_avail,
				 st->num_os_ratios);
		mutex_lock(&st->lock);
		ret = st->write_os(indio_dev, i);
		if (ret < 0) {
			mutex_unlock(&st->lock);
			return ret;
		}
		st->oversampling = st->oversampling_avail[i];
		mutex_unlock(&st->lock);

		return 0;
	default:
		return -EINVAL;
	}
}

static ssize_t ad7606_oversampling_ratio_avail(struct device *dev,
					       struct device_attribute *attr,
					       char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct ad7606_state *st = iio_priv(indio_dev);

	return ad7606_show_avail(buf, st->oversampling_avail,
				 st->num_os_ratios, false);
}

static IIO_DEVICE_ATTR(oversampling_ratio_available, 0444,
		       ad7606_oversampling_ratio_avail, NULL, 0);

static struct attribute *ad7606_attributes_os_and_range[] = {
	&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
	&iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group ad7606_attribute_group_os_and_range = {
	.attrs = ad7606_attributes_os_and_range,
};

static struct attribute *ad7606_attributes_os[] = {
	&iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group ad7606_attribute_group_os = {
	.attrs = ad7606_attributes_os,
};

static struct attribute *ad7606_attributes_range[] = {
	&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group ad7606_attribute_group_range = {
	.attrs = ad7606_attributes_range,
};

static const struct iio_chan_spec ad7605_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(4),
	AD7605_CHANNEL(0),
	AD7605_CHANNEL(1),
	AD7605_CHANNEL(2),
	AD7605_CHANNEL(3),
};

static const struct iio_chan_spec ad7606_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(8),
	AD7606_CHANNEL(0),
	AD7606_CHANNEL(1),
	AD7606_CHANNEL(2),
	AD7606_CHANNEL(3),
	AD7606_CHANNEL(4),
	AD7606_CHANNEL(5),
	AD7606_CHANNEL(6),
	AD7606_CHANNEL(7),
};

static const struct iio_chan_spec ad7606B_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(8),
	AD7606B_CHANNEL(0),
	AD7606B_CHANNEL(1),
	AD7606B_CHANNEL(2),
	AD7606B_CHANNEL(3),
	AD7606B_CHANNEL(4),
	AD7606B_CHANNEL(5),
	AD7606B_CHANNEL(6),
	AD7606B_CHANNEL(7),
};

/*
 * The current assumption that this driver makes for AD7616, is that it's
 * working in Hardware Mode with Serial, Burst and Sequencer modes activated.
 * To activate them, following pins must be pulled high:
 *	-SER/PAR
 *	-SEQEN
 * And following pins must be pulled low:
 *	-WR/BURST
 *	-DB4/SER1W
 */
static const struct iio_chan_spec ad7616_channels[] = {
	IIO_CHAN_SOFT_TIMESTAMP(16),
	AD7606_CHANNEL(0),
	AD7606_CHANNEL(1),
	AD7606_CHANNEL(2),
	AD7606_CHANNEL(3),
	AD7606_CHANNEL(4),
	AD7606_CHANNEL(5),
	AD7606_CHANNEL(6),
	AD7606_CHANNEL(7),
	AD7606_CHANNEL(8),
	AD7606_CHANNEL(9),
	AD7606_CHANNEL(10),
	AD7606_CHANNEL(11),
	AD7606_CHANNEL(12),
	AD7606_CHANNEL(13),
	AD7606_CHANNEL(14),
	AD7606_CHANNEL(15),
};




static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
	/* More devices added in future */
	[ID_AD7605_4] = {
		.channels = ad7605_channels,
		.num_channels = 5,
	},
	[ID_AD7606_8] = {
		.channels = ad7606_channels,
		.num_channels = 9,
		.oversampling_avail = ad7606_oversampling_avail,
		.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
	},
	[ID_AD7606_6] = {
		.channels = ad7606_channels,
		.num_channels = 7,
		.oversampling_avail = ad7606_oversampling_avail,
		.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
	},
	[ID_AD7606_4] = {
		.channels = ad7606_channels,
		.num_channels = 5,
		.oversampling_avail = ad7606_oversampling_avail,
		.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
	},
	[ID_AD7606B] = {
		.channels = ad7606_channels,
		.num_channels = 9,
		.oversampling_avail = ad7606_oversampling_avail,
		.oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
	},
	[ID_AD7616] = {
		.channels = ad7616_channels,
		.num_channels = 17,
		.oversampling_avail = ad7616_oversampling_avail,
		.oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
		.os_req_reset = true,
		.init_delay_ms = 15,
	},
};

static int ad7606_request_gpios(struct ad7606_state *st)
{
	struct device *dev = st->dev;

	st->gpio_convst = devm_gpiod_get(dev, "adi,conversion-start",GPIOD_OUT_LOW);
	if (IS_ERR(st->gpio_convst))
		return PTR_ERR(st->gpio_convst);
	
	st->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(st->gpio_reset))
		return PTR_ERR(st->gpio_reset);

	st->gpio_range = devm_gpiod_get_optional(dev, "adi,range",
						 GPIOD_OUT_LOW);
	if (IS_ERR(st->gpio_range))
		return PTR_ERR(st->gpio_range);

	st->gpio_standby = devm_gpiod_get_optional(dev, "standby",
						   GPIOD_OUT_HIGH);
	if (IS_ERR(st->gpio_standby))
		return PTR_ERR(st->gpio_standby);

	st->gpio_frstdata = devm_gpiod_get_optional(dev, "adi,first-data",
						    GPIOD_IN);
	if (IS_ERR(st->gpio_frstdata))
		return PTR_ERR(st->gpio_frstdata);

	if (!st->chip_info->oversampling_num)
		return 0;

	st->gpio_os = devm_gpiod_get_array_optional(dev,
						    "adi,oversampling-ratio",
						    GPIOD_OUT_LOW);
	return PTR_ERR_OR_ZERO(st->gpio_os);
}

/*
 * The BUSY signal indicates when conversions are in progress, so when a rising
 * edge of CONVST is applied, BUSY goes logic high and transitions low at the
 * end of the entire conversion process. The falling edge of the BUSY signal
 * triggers this interrupt.
 */
static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
{
	struct iio_dev *indio_dev = dev_id;
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	if (iio_buffer_enabled(indio_dev)) {
		gpiod_set_value(st->gpio_convst, 0);
		iio_trigger_poll_chained(st->trig);
	} else {
		complete(&st->completion);
	}

	return IRQ_HANDLED;
};

static int ad7606_validate_trigger(struct iio_dev *indio_dev,
				   struct iio_trigger *trig)
{
	struct ad7606_state *st = ad7606_get_data(indio_dev);
	if (st->trig != trig)
		return -EINVAL;

	return 0;
}

static int hw_submit_block(struct iio_dma_buffer_queue *queue,
			   struct iio_dma_buffer_block *block)
{
	block->block.bytes_used = block->block.size;
	return iio_dmaengine_buffer_submit_block(queue, block, DMA_DEV_TO_MEM);
}


static const struct iio_dma_buffer_ops dma_buffer_ops = {
	.submit = hw_submit_block,
	.abort = iio_dmaengine_buffer_abort,
};

static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
	.postenable = &ad7606_buffer_postenable,
	.predisable = &ad7606_buffer_predisable,
};

static const struct iio_info ad7606_info_no_os_or_range = {
	.read_raw = &ad7606_read_raw,
	.validate_trigger = &ad7606_validate_trigger,
};

static const struct iio_info ad7606_info_os_and_range = {
	.read_raw = &ad7606_read_raw,
	.write_raw = &ad7606_write_raw,
	.attrs = &ad7606_attribute_group_os_and_range,
	.validate_trigger = &ad7606_validate_trigger,
};

static const struct iio_info ad7606_info_os_range_and_debug = {
	.read_raw = &ad7606_read_raw,
	.write_raw = &ad7606_write_raw,
	.debugfs_reg_access = &ad7606_reg_access,
	.attrs = &ad7606_attribute_group_os_and_range,
	.validate_trigger = &ad7606_validate_trigger,
};

static const struct iio_info ad7606_info_os = {
	.read_raw = &ad7606_read_raw,
	.write_raw = &ad7606_write_raw,
	.attrs = &ad7606_attribute_group_os,
	.validate_trigger = &ad7606_validate_trigger,
};

static const struct iio_info ad7606_info_range = {
	.attrs = &ad7606_attribute_group_os_and_range,
	.read_raw = &ad7606_read_raw,
	.write_raw = &ad7606_write_raw,
	.attrs = &ad7606_attribute_group_range,
	.validate_trigger = &ad7606_validate_trigger,
};

static const struct iio_trigger_ops ad7606_trigger_ops = {
	.validate_device = iio_trigger_validate_own_device,
};


static void ad7606_regulator_disable(void *data)
{
	struct ad7606_state *st = data;
	regulator_disable(st->reg);
} 

static int ad7606_post_setup(struct iio_dev *indio_dev){
	indio_dev->setup_ops = &ad7606_buffer_ops;
	return 0;
}

static int ad7606_register_axi_adc(struct ad7606_state *st, struct iio_dev *indio_dev)
{
	struct axiadc_converter	*conv;
	struct spi_device *spi = to_spi_device(st->dev);

	conv = devm_kzalloc(st->dev, sizeof(*conv), GFP_KERNEL);
	if (conv == NULL)
		return -ENOMEM;

	conv->spi = spi;
	conv->clk = NULL;
	conv->chip_info = &conv_chip_info;
	conv->adc_output_mode = AD7606_OUTPUT_MODE_TWOS_COMPLEMENT;
	conv->reg_access = &ad7606_reg_access;
	conv->write_raw = &ad7606_write_raw;
	conv->read_raw = &ad7606_read_raw;
	conv->post_setup = &ad7606_post_setup;
	conv->attrs = &ad7606_attribute_group_os_and_range;
	conv->phy = st;
	/* Without this, the axi_adc won't find the converter data */
	spi_set_drvdata(spi, conv);

	return 0;
}



static int ad7606_register(struct ad7606_state *st, struct iio_dev *indio_dev)
{
	struct iio_buffer *buffer;
	buffer = devm_iio_dmaengine_buffer_alloc(indio_dev->dev.parent, "rx",
						&dma_buffer_ops, indio_dev);
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);

	iio_device_attach_buffer(indio_dev, buffer);

	return devm_iio_device_register(st->dev, indio_dev);
}

int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
		 const char *name, unsigned int id,
		 const struct ad7606_bus_ops *bops)
{
	struct ad7606_state *st;
	int ret;
	struct iio_dev *indio_dev;
	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
	if (!indio_dev)
		return -ENOMEM;

	st = iio_priv(indio_dev);
	dev_set_drvdata(dev, indio_dev);
	
	st->dev = dev;
	mutex_init(&st->lock);
	st->bops = bops;
	st->base_address = base_address;
	/* tied to logic low, analog input range is +/- 5V */
	st->range[0] = 0;
	st->oversampling = 1;
	st->scale_avail = ad7606_scale_avail;
	st->num_scales = ARRAY_SIZE(ad7606B_scale_avail);

	st->reg = devm_regulator_get(dev, "avcc");
	if (IS_ERR(st->reg))
		return PTR_ERR(st->reg);

	ret = regulator_enable(st->reg);
	if (ret) {
		dev_err(dev, "Failed to enable specified AVcc supply\n");
		return ret;
	}

	ret = devm_add_action_or_reset(dev, ad7606_regulator_disable, st);
	if (ret)
		return ret;

	st->chip_info = &ad7606_chip_info_tbl[id];

	if (st->chip_info->oversampling_num) {
		st->oversampling_avail = st->chip_info->oversampling_avail;
		st->num_os_ratios = st->chip_info->oversampling_num;
	}

	ret = ad7606_request_gpios(st);
	if (ret)
		return ret;

	indio_dev->dev.parent = dev;
	if (st->gpio_os) {
		if (st->gpio_range)
			indio_dev->info = &ad7606_info_os_and_range;
		else
			indio_dev->info = &ad7606_info_os;
	} else {
		if (st->gpio_range)
			indio_dev->info = &ad7606_info_range;
		else
			indio_dev->info = &ad7606_info_no_os_or_range;
	}
	
	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_HARDWARE;
	indio_dev->name = name;
	indio_dev->channels = st->chip_info->channels;
	indio_dev->num_channels = st->chip_info->num_channels;
	indio_dev->setup_ops = &ad7606_buffer_ops;
	
	ret = ad7606_reset(st);
	if (ret)
		dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");

	/* AD7616 requires al least 15ms to reconfigure after a reset */
	if (st->chip_info->init_delay_ms) {
		if (msleep_interruptible(st->chip_info->init_delay_ms))
			return -ERESTARTSYS;
	}

	st->write_scale = ad7606_write_scale_hw;
	st->write_os = ad7606_write_os_hw;

	if (st->bops->sw_mode_config)
		st->sw_mode_en = device_property_present(st->dev,
							 "adi,sw-mode");

	if (st->sw_mode_en) {
		indio_dev->info = &ad7606_info_os_range_and_debug;
		/* Scale of 0.076293 is only available in sw mode */
		st->scale_avail = ad7606B_scale_avail;
		st->num_scales = ARRAY_SIZE(ad7606B_scale_avail);
		/* After reset, in software mode, ±10 V is set by default */
		memset32(st->range, 1, ARRAY_SIZE(st->range));
		ret = st->bops->sw_mode_config(indio_dev);
	}

	init_completion(&st->completion);

	/*  If there is a reference to a dma channel, the device is not using
	 *  the axi adc
	 */
	if (device_property_present(st->dev, "dmas"))
		ret = ad7606_register(st, indio_dev);
	else
		ret = ad7606_register_axi_adc(st,indio_dev);
	return ret;
}
EXPORT_SYMBOL_GPL(ad7606_probe);

#ifdef CONFIG_PM_SLEEP

static int ad7606_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad7606_state *st = iio_priv(indio_dev);

	if (st->gpio_standby) {
		gpiod_set_value(st->gpio_range, 1);
		gpiod_set_value(st->gpio_standby, 0);
	}

	return 0;
}

static int ad7606_resume(struct device *dev)
{
	struct iio_dev *indio_dev = dev_get_drvdata(dev);
	struct ad7606_state *st = iio_priv(indio_dev);

	if (st->gpio_standby) {
		gpiod_set_value(st->gpio_range, st->range[0]);
		gpiod_set_value(st->gpio_standby, 1);
		ad7606_reset(st);
	}

	return 0;
}

SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
EXPORT_SYMBOL_GPL(ad7606_pm_ops);

#endif

MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
MODULE_LICENSE("GPL v2");

regards,

shivshankar thati

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