Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 652 insertions, 0 deletions

diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
new file mode 100644
index 000000000..4afa50e5c
--- /dev/null
+++ b/drivers/iio/adc/ad7768-1.c
@@ -0,0 +1,652 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices AD7768-1 SPI ADC driver
+ *
+ * Copyright 2017 Analog Devices Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+/* AD7768 registers definition */
+#define AD7768_REG_CHIP_TYPE		0x3
+#define AD7768_REG_PROD_ID_L		0x4
+#define AD7768_REG_PROD_ID_H		0x5
+#define AD7768_REG_CHIP_GRADE		0x6
+#define AD7768_REG_SCRATCH_PAD		0x0A
+#define AD7768_REG_VENDOR_L		0x0C
+#define AD7768_REG_VENDOR_H		0x0D
+#define AD7768_REG_INTERFACE_FORMAT	0x14
+#define AD7768_REG_POWER_CLOCK		0x15
+#define AD7768_REG_ANALOG		0x16
+#define AD7768_REG_ANALOG2		0x17
+#define AD7768_REG_CONVERSION		0x18
+#define AD7768_REG_DIGITAL_FILTER	0x19
+#define AD7768_REG_SINC3_DEC_RATE_MSB	0x1A
+#define AD7768_REG_SINC3_DEC_RATE_LSB	0x1B
+#define AD7768_REG_DUTY_CYCLE_RATIO	0x1C
+#define AD7768_REG_SYNC_RESET		0x1D
+#define AD7768_REG_GPIO_CONTROL		0x1E
+#define AD7768_REG_GPIO_WRITE		0x1F
+#define AD7768_REG_GPIO_READ		0x20
+#define AD7768_REG_OFFSET_HI		0x21
+#define AD7768_REG_OFFSET_MID		0x22
+#define AD7768_REG_OFFSET_LO		0x23
+#define AD7768_REG_GAIN_HI		0x24
+#define AD7768_REG_GAIN_MID		0x25
+#define AD7768_REG_GAIN_LO		0x26
+#define AD7768_REG_SPI_DIAG_ENABLE	0x28
+#define AD7768_REG_ADC_DIAG_ENABLE	0x29
+#define AD7768_REG_DIG_DIAG_ENABLE	0x2A
+#define AD7768_REG_ADC_DATA		0x2C
+#define AD7768_REG_MASTER_STATUS	0x2D
+#define AD7768_REG_SPI_DIAG_STATUS	0x2E
+#define AD7768_REG_ADC_DIAG_STATUS	0x2F
+#define AD7768_REG_DIG_DIAG_STATUS	0x30
+#define AD7768_REG_MCLK_COUNTER		0x31
+
+/* AD7768_REG_POWER_CLOCK */
+#define AD7768_PWR_MCLK_DIV_MSK		GENMASK(5, 4)
+#define AD7768_PWR_MCLK_DIV(x)		FIELD_PREP(AD7768_PWR_MCLK_DIV_MSK, x)
+#define AD7768_PWR_PWRMODE_MSK		GENMASK(1, 0)
+#define AD7768_PWR_PWRMODE(x)		FIELD_PREP(AD7768_PWR_PWRMODE_MSK, x)
+
+/* AD7768_REG_DIGITAL_FILTER */
+#define AD7768_DIG_FIL_FIL_MSK		GENMASK(6, 4)
+#define AD7768_DIG_FIL_FIL(x)		FIELD_PREP(AD7768_DIG_FIL_FIL_MSK, x)
+#define AD7768_DIG_FIL_DEC_MSK		GENMASK(2, 0)
+#define AD7768_DIG_FIL_DEC_RATE(x)	FIELD_PREP(AD7768_DIG_FIL_DEC_MSK, x)
+
+/* AD7768_REG_CONVERSION */
+#define AD7768_CONV_MODE_MSK		GENMASK(2, 0)
+#define AD7768_CONV_MODE(x)		FIELD_PREP(AD7768_CONV_MODE_MSK, x)
+
+#define AD7768_RD_FLAG_MSK(x)		(BIT(6) | ((x) & 0x3F))
+#define AD7768_WR_FLAG_MSK(x)		((x) & 0x3F)
+
+enum ad7768_conv_mode {
+	AD7768_CONTINUOUS,
+	AD7768_ONE_SHOT,
+	AD7768_SINGLE,
+	AD7768_PERIODIC,
+	AD7768_STANDBY
+};
+
+enum ad7768_pwrmode {
+	AD7768_ECO_MODE = 0,
+	AD7768_MED_MODE = 2,
+	AD7768_FAST_MODE = 3
+};
+
+enum ad7768_mclk_div {
+	AD7768_MCLK_DIV_16,
+	AD7768_MCLK_DIV_8,
+	AD7768_MCLK_DIV_4,
+	AD7768_MCLK_DIV_2
+};
+
+enum ad7768_dec_rate {
+	AD7768_DEC_RATE_32 = 0,
+	AD7768_DEC_RATE_64 = 1,
+	AD7768_DEC_RATE_128 = 2,
+	AD7768_DEC_RATE_256 = 3,
+	AD7768_DEC_RATE_512 = 4,
+	AD7768_DEC_RATE_1024 = 5,
+	AD7768_DEC_RATE_8 = 9,
+	AD7768_DEC_RATE_16 = 10
+};
+
+struct ad7768_clk_configuration {
+	enum ad7768_mclk_div mclk_div;
+	enum ad7768_dec_rate dec_rate;
+	unsigned int clk_div;
+	enum ad7768_pwrmode pwrmode;
+};
+
+static const struct ad7768_clk_configuration ad7768_clk_config[] = {
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_8, 16,  AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_16, 32,  AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_32, 64, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_64, 128, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_128, 256, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_128, 512, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_256, 1024, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_512, 2048, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_1024, 4096, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_8, AD7768_DEC_RATE_1024, 8192, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_16, AD7768_DEC_RATE_1024, 16384, AD7768_ECO_MODE },
+};
+
+static const struct iio_chan_spec ad7768_channels[] = {
+	{
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.indexed = 1,
+		.channel = 0,
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 24,
+			.storagebits = 32,
+			.shift = 8,
+			.endianness = IIO_BE,
+		},
+	},
+};
+
+struct ad7768_state {
+	struct spi_device *spi;
+	struct regulator *vref;
+	struct mutex lock;
+	struct clk *mclk;
+	unsigned int mclk_freq;
+	unsigned int samp_freq;
+	struct completion completion;
+	struct iio_trigger *trig;
+	struct gpio_desc *gpio_sync_in;
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	union {
+		struct {
+			__be32 chan;
+			s64 timestamp;
+		} scan;
+		__be32 d32;
+		u8 d8[2];
+	} data ____cacheline_aligned;
+};
+
+static int ad7768_spi_reg_read(struct ad7768_state *st, unsigned int addr,
+			       unsigned int len)
+{
+	unsigned int shift;
+	int ret;
+
+	shift = 32 - (8 * len);
+	st->data.d8[0] = AD7768_RD_FLAG_MSK(addr);
+
+	ret = spi_write_then_read(st->spi, st->data.d8, 1,
+				  &st->data.d32, len);
+	if (ret < 0)
+		return ret;
+
+	return (be32_to_cpu(st->data.d32) >> shift);
+}
+
+static int ad7768_spi_reg_write(struct ad7768_state *st,
+				unsigned int addr,
+				unsigned int val)
+{
+	st->data.d8[0] = AD7768_WR_FLAG_MSK(addr);
+	st->data.d8[1] = val & 0xFF;
+
+	return spi_write(st->spi, st->data.d8, 2);
+}
+
+static int ad7768_set_mode(struct ad7768_state *st,
+			   enum ad7768_conv_mode mode)
+{
+	int regval;
+
+	regval = ad7768_spi_reg_read(st, AD7768_REG_CONVERSION, 1);
+	if (regval < 0)
+		return regval;
+
+	regval &= ~AD7768_CONV_MODE_MSK;
+	regval |= AD7768_CONV_MODE(mode);
+
+	return ad7768_spi_reg_write(st, AD7768_REG_CONVERSION, regval);
+}
+
+static int ad7768_scan_direct(struct iio_dev *indio_dev)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int readval, ret;
+
+	reinit_completion(&st->completion);
+
+	ret = ad7768_set_mode(st, AD7768_ONE_SHOT);
+	if (ret < 0)
+		return ret;
+
+	ret = wait_for_completion_timeout(&st->completion,
+					  msecs_to_jiffies(1000));
+	if (!ret)
+		return -ETIMEDOUT;
+
+	readval = ad7768_spi_reg_read(st, AD7768_REG_ADC_DATA, 3);
+	if (readval < 0)
+		return readval;
+	/*
+	 * Any SPI configuration of the AD7768-1 can only be
+	 * performed in continuous conversion mode.
+	 */
+	ret = ad7768_set_mode(st, AD7768_CONTINUOUS);
+	if (ret < 0)
+		return ret;
+
+	return readval;
+}
+
+static int ad7768_reg_access(struct iio_dev *indio_dev,
+			     unsigned int reg,
+			     unsigned int writeval,
+			     unsigned int *readval)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->lock);
+	if (readval) {
+		ret = ad7768_spi_reg_read(st, reg, 1);
+		if (ret < 0)
+			goto err_unlock;
+		*readval = ret;
+		ret = 0;
+	} else {
+		ret = ad7768_spi_reg_write(st, reg, writeval);
+	}
+err_unlock:
+	mutex_unlock(&st->lock);
+
+	return ret;
+}
+
+static int ad7768_set_dig_fil(struct ad7768_state *st,
+			      enum ad7768_dec_rate dec_rate)
+{
+	unsigned int mode;
+	int ret;
+
+	if (dec_rate == AD7768_DEC_RATE_8 || dec_rate == AD7768_DEC_RATE_16)
+		mode = AD7768_DIG_FIL_FIL(dec_rate);
+	else
+		mode = AD7768_DIG_FIL_DEC_RATE(dec_rate);
+
+	ret = ad7768_spi_reg_write(st, AD7768_REG_DIGITAL_FILTER, mode);
+	if (ret < 0)
+		return ret;
+
+	/* A sync-in pulse is required every time the filter dec rate changes */
+	gpiod_set_value(st->gpio_sync_in, 1);
+	gpiod_set_value(st->gpio_sync_in, 0);
+
+	return 0;
+}
+
+static int ad7768_set_freq(struct ad7768_state *st,
+			   unsigned int freq)
+{
+	unsigned int diff_new, diff_old, pwr_mode, i, idx;
+	int res, ret;
+
+	diff_old = U32_MAX;
+	idx = 0;
+
+	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);
+
+	/* Find the closest match for the desired sampling frequency */
+	for (i = 0; i < ARRAY_SIZE(ad7768_clk_config); i++) {
+		diff_new = abs(res - ad7768_clk_config[i].clk_div);
+		if (diff_new < diff_old) {
+			diff_old = diff_new;
+			idx = i;
+		}
+	}
+
+	/*
+	 * Set both the mclk_div and pwrmode with a single write to the
+	 * POWER_CLOCK register
+	 */
+	pwr_mode = AD7768_PWR_MCLK_DIV(ad7768_clk_config[idx].mclk_div) |
+		   AD7768_PWR_PWRMODE(ad7768_clk_config[idx].pwrmode);
+	ret = ad7768_spi_reg_write(st, AD7768_REG_POWER_CLOCK, pwr_mode);
+	if (ret < 0)
+		return ret;
+
+	ret =  ad7768_set_dig_fil(st, ad7768_clk_config[idx].dec_rate);
+	if (ret < 0)
+		return ret;
+
+	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,
+					  ad7768_clk_config[idx].clk_div);
+
+	return 0;
+}
+
+static ssize_t ad7768_sampling_freq_avail(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad7768_state *st = iio_priv(indio_dev);
+	unsigned int freq;
+	int i, len = 0;
+
+	for (i = 0; i < ARRAY_SIZE(ad7768_clk_config); i++) {
+		freq = DIV_ROUND_CLOSEST(st->mclk_freq,
+					 ad7768_clk_config[i].clk_div);
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);
+	}
+
+	buf[len - 1] = '\n';
+
+	return len;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ad7768_sampling_freq_avail);
+
+static int ad7768_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long info)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int scale_uv, ret;
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		ret = ad7768_scan_direct(indio_dev);
+		if (ret >= 0)
+			*val = ret;
+
+		iio_device_release_direct_mode(indio_dev);
+		if (ret < 0)
+			return ret;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		scale_uv = regulator_get_voltage(st->vref);
+		if (scale_uv < 0)
+			return scale_uv;
+
+		*val = (scale_uv * 2) / 1000;
+		*val2 = chan->scan_type.realbits;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = st->samp_freq;
+
+		return IIO_VAL_INT;
+	}
+
+	return -EINVAL;
+}
+
+static int ad7768_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long info)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	switch (info) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return ad7768_set_freq(st, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct attribute *ad7768_attributes[] = {
+	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group ad7768_group = {
+	.attrs = ad7768_attributes,
+};
+
+static const struct iio_info ad7768_info = {
+	.attrs = &ad7768_group,
+	.read_raw = &ad7768_read_raw,
+	.write_raw = &ad7768_write_raw,
+	.debugfs_reg_access = &ad7768_reg_access,
+};
+
+static int ad7768_setup(struct ad7768_state *st)
+{
+	int ret;
+
+	/*
+	 * Two writes to the SPI_RESET[1:0] bits are required to initiate
+	 * a software reset. The bits must first be set to 11, and then
+	 * to 10. When the sequence is detected, the reset occurs.
+	 * See the datasheet, page 70.
+	 */
+	ret = ad7768_spi_reg_write(st, AD7768_REG_SYNC_RESET, 0x3);
+	if (ret)
+		return ret;
+
+	ret = ad7768_spi_reg_write(st, AD7768_REG_SYNC_RESET, 0x2);
+	if (ret)
+		return ret;
+
+	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",
+					  GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_sync_in))
+		return PTR_ERR(st->gpio_sync_in);
+
+	/* Set the default sampling frequency to 32000 kSPS */
+	return ad7768_set_freq(st, 32000);
+}
+
+static irqreturn_t ad7768_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->lock);
+
+	ret = spi_read(st->spi, &st->data.scan.chan, 3);
+	if (ret < 0)
+		goto err_unlock;
+
+	iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,
+					   iio_get_time_ns(indio_dev));
+
+err_unlock:
+	iio_trigger_notify_done(indio_dev->trig);
+	mutex_unlock(&st->lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ad7768_interrupt(int irq, void *dev_id)
+{
+	struct iio_dev *indio_dev = dev_id;
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	if (iio_buffer_enabled(indio_dev))
+		iio_trigger_poll(st->trig);
+	else
+		complete(&st->completion);
+
+	return IRQ_HANDLED;
+};
+
+static int ad7768_buffer_postenable(struct iio_dev *indio_dev)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	/*
+	 * Write a 1 to the LSB of the INTERFACE_FORMAT register to enter
+	 * continuous read mode. Subsequent data reads do not require an
+	 * initial 8-bit write to query the ADC_DATA register.
+	 */
+	return ad7768_spi_reg_write(st, AD7768_REG_INTERFACE_FORMAT, 0x01);
+}
+
+static int ad7768_buffer_predisable(struct iio_dev *indio_dev)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	/*
+	 * To exit continuous read mode, perform a single read of the ADC_DATA
+	 * reg (0x2C), which allows further configuration of the device.
+	 */
+	return ad7768_spi_reg_read(st, AD7768_REG_ADC_DATA, 3);
+}
+
+static const struct iio_buffer_setup_ops ad7768_buffer_ops = {
+	.postenable = &ad7768_buffer_postenable,
+	.predisable = &ad7768_buffer_predisable,
+};
+
+static const struct iio_trigger_ops ad7768_trigger_ops = {
+	.validate_device = iio_trigger_validate_own_device,
+};
+
+static void ad7768_regulator_disable(void *data)
+{
+	struct ad7768_state *st = data;
+
+	regulator_disable(st->vref);
+}
+
+static void ad7768_clk_disable(void *data)
+{
+	struct ad7768_state *st = data;
+
+	clk_disable_unprepare(st->mclk);
+}
+
+static int ad7768_probe(struct spi_device *spi)
+{
+	struct ad7768_state *st;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	st->spi = spi;
+
+	st->vref = devm_regulator_get(&spi->dev, "vref");
+	if (IS_ERR(st->vref))
+		return PTR_ERR(st->vref);
+
+	ret = regulator_enable(st->vref);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to enable specified vref supply\n");
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(&spi->dev, ad7768_regulator_disable, st);
+	if (ret)
+		return ret;
+
+	st->mclk = devm_clk_get(&spi->dev, "mclk");
+	if (IS_ERR(st->mclk))
+		return PTR_ERR(st->mclk);
+
+	ret = clk_prepare_enable(st->mclk);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_add_action_or_reset(&spi->dev, ad7768_clk_disable, st);
+	if (ret)
+		return ret;
+
+	st->mclk_freq = clk_get_rate(st->mclk);
+
+	spi_set_drvdata(spi, indio_dev);
+	mutex_init(&st->lock);
+
+	indio_dev->channels = ad7768_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad7768_channels);
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->info = &ad7768_info;
+	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;
+
+	ret = ad7768_setup(st);
+	if (ret < 0) {
+		dev_err(&spi->dev, "AD7768 setup failed\n");
+		return ret;
+	}
+
+	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",
+					  indio_dev->name, indio_dev->id);
+	if (!st->trig)
+		return -ENOMEM;
+
+	st->trig->ops = &ad7768_trigger_ops;
+	st->trig->dev.parent = &spi->dev;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
+	ret = devm_iio_trigger_register(&spi->dev, st->trig);
+	if (ret)
+		return ret;
+
+	indio_dev->trig = iio_trigger_get(st->trig);
+
+	init_completion(&st->completion);
+
+	ret = devm_request_irq(&spi->dev, spi->irq,
+			       &ad7768_interrupt,
+			       IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+			       indio_dev->name, indio_dev);
+	if (ret)
+		return ret;
+
+	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
+					      &iio_pollfunc_store_time,
+					      &ad7768_trigger_handler,
+					      &ad7768_buffer_ops);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id ad7768_id_table[] = {
+	{ "ad7768-1", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ad7768_id_table);
+
+static const struct of_device_id ad7768_of_match[] = {
+	{ .compatible = "adi,ad7768-1" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ad7768_of_match);
+
+static struct spi_driver ad7768_driver = {
+	.driver = {
+		.name = "ad7768-1",
+		.of_match_table = ad7768_of_match,
+	},
+	.probe = ad7768_probe,
+	.id_table = ad7768_id_table,
+};
+module_spi_driver(ad7768_driver);
+
+MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7768-1 ADC driver");
+MODULE_LICENSE("GPL v2");