diff mbox series

[v3,2/2] iio: light: Add support for ADUX1020 sensor

Message ID 20191011184852.12202-3-manivannan.sadhasivam@linaro.org
State Accepted
Commit 3565435455762160f19ca20769d767d9df7d8717
Headers show
Series None | expand

Commit Message

Manivannan Sadhasivam Oct. 11, 2019, 6:48 p.m. UTC
Add initial support for Analog Devices ADUX1020 Photometric sensor.
Only proximity mode has been enabled for now.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

---
 drivers/iio/light/Kconfig    |  11 +
 drivers/iio/light/Makefile   |   1 +
 drivers/iio/light/adux1020.c | 849 +++++++++++++++++++++++++++++++++++
 3 files changed, 861 insertions(+)
 create mode 100644 drivers/iio/light/adux1020.c

-- 
2.17.1

Comments

Jonathan Cameron Oct. 12, 2019, 10:36 a.m. UTC | #1
On Sat, 12 Oct 2019 00:18:52 +0530
Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> wrote:

> Add initial support for Analog Devices ADUX1020 Photometric sensor.

> Only proximity mode has been enabled for now.

> 

> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>


Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to poke at it.

Note I will be rebasing my tree shortly to move to current cycle,
so testing branch is even less 'stable' than normal ;)

Thanks,

Jonathan

> ---

>  drivers/iio/light/Kconfig    |  11 +

>  drivers/iio/light/Makefile   |   1 +

>  drivers/iio/light/adux1020.c | 849 +++++++++++++++++++++++++++++++++++

>  3 files changed, 861 insertions(+)

>  create mode 100644 drivers/iio/light/adux1020.c

> 

> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig

> index 08d7e1ef2186..3f8c8689cd89 100644

> --- a/drivers/iio/light/Kconfig

> +++ b/drivers/iio/light/Kconfig

> @@ -32,6 +32,17 @@ config ADJD_S311

>  	  This driver can also be built as a module.  If so, the module

>  	  will be called adjd_s311.

>  

> +config ADUX1020

> +	tristate "ADUX1020 photometric sensor"

> +	select REGMAP_I2C

> +	depends on I2C

> +	help

> +	 Say Y here if you want to build a driver for the Analog Devices

> +	 ADUX1020 photometric sensor.

> +

> +	 To compile this driver as a module, choose M here: the

> +	 module will be called adux1020.

> +

>  config AL3320A

>  	tristate "AL3320A ambient light sensor"

>  	depends on I2C

> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile

> index 00d1f9b98f39..5d650ce46a40 100644

> --- a/drivers/iio/light/Makefile

> +++ b/drivers/iio/light/Makefile

> @@ -6,6 +6,7 @@

>  # When adding new entries keep the list in alphabetical order

>  obj-$(CONFIG_ACPI_ALS)		+= acpi-als.o

>  obj-$(CONFIG_ADJD_S311)		+= adjd_s311.o

> +obj-$(CONFIG_ADUX1020)		+= adux1020.o

>  obj-$(CONFIG_AL3320A)		+= al3320a.o

>  obj-$(CONFIG_APDS9300)		+= apds9300.o

>  obj-$(CONFIG_APDS9960)		+= apds9960.o

> diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c

> new file mode 100644

> index 000000000000..830e5e95d58f

> --- /dev/null

> +++ b/drivers/iio/light/adux1020.c

> @@ -0,0 +1,849 @@

> +// SPDX-License-Identifier: GPL-2.0+

> +/*

> + * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor

> + *

> + * Copyright (C) 2019 Linaro Ltd.

> + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

> + *

> + * TODO: Triggered buffer support

> + */

> +

> +#include <linux/bitfield.h>

> +#include <linux/delay.h>

> +#include <linux/err.h>

> +#include <linux/i2c.h>

> +#include <linux/init.h>

> +#include <linux/interrupt.h>

> +#include <linux/irq.h>

> +#include <linux/module.h>

> +#include <linux/mutex.h>

> +#include <linux/regmap.h>

> +

> +#include <linux/iio/iio.h>

> +#include <linux/iio/sysfs.h>

> +#include <linux/iio/events.h>

> +

> +#define ADUX1020_REGMAP_NAME		"adux1020_regmap"

> +#define ADUX1020_DRV_NAME		"adux1020"

> +

> +/* System registers */

> +#define ADUX1020_REG_CHIP_ID		0x08

> +#define ADUX1020_REG_SLAVE_ADDRESS	0x09

> +

> +#define ADUX1020_REG_SW_RESET		0x0f

> +#define ADUX1020_REG_INT_ENABLE		0x1c

> +#define ADUX1020_REG_INT_POLARITY	0x1d

> +#define ADUX1020_REG_PROX_TH_ON1	0x2a

> +#define ADUX1020_REG_PROX_TH_OFF1	0x2b

> +#define	ADUX1020_REG_PROX_TYPE		0x2f

> +#define	ADUX1020_REG_TEST_MODES_3	0x32

> +#define	ADUX1020_REG_FORCE_MODE		0x33

> +#define	ADUX1020_REG_FREQUENCY		0x40

> +#define ADUX1020_REG_LED_CURRENT	0x41

> +#define	ADUX1020_REG_OP_MODE		0x45

> +#define	ADUX1020_REG_INT_MASK		0x48

> +#define	ADUX1020_REG_INT_STATUS		0x49

> +#define	ADUX1020_REG_DATA_BUFFER	0x60

> +

> +/* Chip ID bits */

> +#define ADUX1020_CHIP_ID_MASK		GENMASK(11, 0)

> +#define ADUX1020_CHIP_ID		0x03fc

> +

> +#define ADUX1020_SW_RESET		BIT(1)

> +#define ADUX1020_FIFO_FLUSH		BIT(15)

> +#define ADUX1020_OP_MODE_MASK		GENMASK(3, 0)

> +#define ADUX1020_DATA_OUT_MODE_MASK	GENMASK(7, 4)

> +#define ADUX1020_DATA_OUT_PROX_I	FIELD_PREP(ADUX1020_DATA_OUT_MODE_MASK, 1)

> +

> +#define ADUX1020_MODE_INT_MASK		GENMASK(7, 0)

> +#define ADUX1020_INT_ENABLE		0x2094

> +#define ADUX1020_INT_DISABLE		0x2090

> +#define ADUX1020_PROX_INT_ENABLE	0x00f0

> +#define ADUX1020_PROX_ON1_INT		BIT(0)

> +#define ADUX1020_PROX_OFF1_INT		BIT(1)

> +#define ADUX1020_FIFO_INT_ENABLE	0x7f

> +#define ADUX1020_MODE_INT_DISABLE	0xff

> +#define ADUX1020_MODE_INT_STATUS_MASK	GENMASK(7, 0)

> +#define ADUX1020_FIFO_STATUS_MASK	GENMASK(15, 8)

> +#define ADUX1020_INT_CLEAR		0xff

> +#define ADUX1020_PROX_TYPE		BIT(15)

> +

> +#define ADUX1020_INT_PROX_ON1		BIT(0)

> +#define ADUX1020_INT_PROX_OFF1		BIT(1)

> +

> +#define ADUX1020_FORCE_CLOCK_ON		0x0f4f

> +#define ADUX1020_FORCE_CLOCK_RESET	0x0040

> +#define ADUX1020_ACTIVE_4_STATE		0x0008

> +

> +#define ADUX1020_PROX_FREQ_MASK		GENMASK(7, 4)

> +#define ADUX1020_PROX_FREQ(x)		FIELD_PREP(ADUX1020_PROX_FREQ_MASK, x)

> +

> +#define ADUX1020_LED_CURRENT_MASK	GENMASK(3, 0)

> +#define ADUX1020_LED_PIREF_EN		BIT(12)

> +

> +/* Operating modes */

> +enum adux1020_op_modes {

> +	ADUX1020_MODE_STANDBY,

> +	ADUX1020_MODE_PROX_I,

> +	ADUX1020_MODE_PROX_XY,

> +	ADUX1020_MODE_GEST,

> +	ADUX1020_MODE_SAMPLE,

> +	ADUX1020_MODE_FORCE = 0x0e,

> +	ADUX1020_MODE_IDLE = 0x0f,

> +};

> +

> +struct adux1020_data {

> +	struct i2c_client *client;

> +	struct iio_dev *indio_dev;

> +	struct mutex lock;

> +	struct regmap *regmap;

> +};

> +

> +struct adux1020_mode_data {

> +	u8 bytes;

> +	u8 buf_len;

> +	u16 int_en;

> +};

> +

> +static const struct adux1020_mode_data adux1020_modes[] = {

> +	[ADUX1020_MODE_PROX_I] = {

> +		.bytes = 2,

> +		.buf_len = 1,

> +		.int_en = ADUX1020_PROX_INT_ENABLE,

> +	},

> +};

> +

> +static const struct regmap_config adux1020_regmap_config = {

> +	.name = ADUX1020_REGMAP_NAME,

> +	.reg_bits = 8,

> +	.val_bits = 16,

> +	.max_register = 0x6F,

> +	.cache_type = REGCACHE_NONE,

> +};

> +

> +static const struct reg_sequence adux1020_def_conf[] = {

> +	{ 0x000c, 0x000f },

> +	{ 0x0010, 0x1010 },

> +	{ 0x0011, 0x004c },

> +	{ 0x0012, 0x5f0c },

> +	{ 0x0013, 0xada5 },

> +	{ 0x0014, 0x0080 },

> +	{ 0x0015, 0x0000 },

> +	{ 0x0016, 0x0600 },

> +	{ 0x0017, 0x0000 },

> +	{ 0x0018, 0x2693 },

> +	{ 0x0019, 0x0004 },

> +	{ 0x001a, 0x4280 },

> +	{ 0x001b, 0x0060 },

> +	{ 0x001c, 0x2094 },

> +	{ 0x001d, 0x0020 },

> +	{ 0x001e, 0x0001 },

> +	{ 0x001f, 0x0100 },

> +	{ 0x0020, 0x0320 },

> +	{ 0x0021, 0x0A13 },

> +	{ 0x0022, 0x0320 },

> +	{ 0x0023, 0x0113 },

> +	{ 0x0024, 0x0000 },

> +	{ 0x0025, 0x2412 },

> +	{ 0x0026, 0x2412 },

> +	{ 0x0027, 0x0022 },

> +	{ 0x0028, 0x0000 },

> +	{ 0x0029, 0x0300 },

> +	{ 0x002a, 0x0700 },

> +	{ 0x002b, 0x0600 },

> +	{ 0x002c, 0x6000 },

> +	{ 0x002d, 0x4000 },

> +	{ 0x002e, 0x0000 },

> +	{ 0x002f, 0x0000 },

> +	{ 0x0030, 0x0000 },

> +	{ 0x0031, 0x0000 },

> +	{ 0x0032, 0x0040 },

> +	{ 0x0033, 0x0008 },

> +	{ 0x0034, 0xE400 },

> +	{ 0x0038, 0x8080 },

> +	{ 0x0039, 0x8080 },

> +	{ 0x003a, 0x2000 },

> +	{ 0x003b, 0x1f00 },

> +	{ 0x003c, 0x2000 },

> +	{ 0x003d, 0x2000 },

> +	{ 0x003e, 0x0000 },

> +	{ 0x0040, 0x8069 },

> +	{ 0x0041, 0x1f2f },

> +	{ 0x0042, 0x4000 },

> +	{ 0x0043, 0x0000 },

> +	{ 0x0044, 0x0008 },

> +	{ 0x0046, 0x0000 },

> +	{ 0x0048, 0x00ef },

> +	{ 0x0049, 0x0000 },

> +	{ 0x0045, 0x0000 },

> +};

> +

> +static const int adux1020_rates[][2] = {

> +	{ 0, 100000 },

> +	{ 0, 200000 },

> +	{ 0, 500000 },

> +	{ 1, 0 },

> +	{ 2, 0 },

> +	{ 5, 0 },

> +	{ 10, 0 },

> +	{ 20, 0 },

> +	{ 50, 0 },

> +	{ 100, 0 },

> +	{ 190, 0 },

> +	{ 450, 0 },

> +	{ 820, 0 },

> +	{ 1400, 0 },

> +};

> +

> +static const int adux1020_led_currents[][2] = {

> +	{ 0, 25000 },

> +	{ 0, 40000 },

> +	{ 0, 55000 },

> +	{ 0, 70000 },

> +	{ 0, 85000 },

> +	{ 0, 100000 },

> +	{ 0, 115000 },

> +	{ 0, 130000 },

> +	{ 0, 145000 },

> +	{ 0, 160000 },

> +	{ 0, 175000 },

> +	{ 0, 190000 },

> +	{ 0, 205000 },

> +	{ 0, 220000 },

> +	{ 0, 235000 },

> +	{ 0, 250000 },

> +};

> +

> +static int adux1020_flush_fifo(struct adux1020_data *data)

> +{

> +	int ret;

> +

> +	/* Force Idle mode */

> +	ret = regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE,

> +			   ADUX1020_ACTIVE_4_STATE);

> +	if (ret < 0)

> +		return ret;

> +

> +	ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,

> +				 ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE);

> +	if (ret < 0)

> +		return ret;

> +

> +	ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,

> +				 ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Flush FIFO */

> +	ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,

> +			   ADUX1020_FORCE_CLOCK_ON);

> +	if (ret < 0)

> +		return ret;

> +

> +	ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,

> +			   ADUX1020_FIFO_FLUSH);

> +	if (ret < 0)

> +		return ret;

> +

> +	return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,

> +			    ADUX1020_FORCE_CLOCK_RESET);

> +}

> +

> +static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len)

> +{

> +	unsigned int regval;

> +	int i, ret;

> +

> +	/* Enable 32MHz clock */

> +	ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,

> +			   ADUX1020_FORCE_CLOCK_ON);

> +	if (ret < 0)

> +		return ret;

> +

> +	for (i = 0; i < buf_len; i++) {

> +		ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER,

> +				  &regval);

> +		if (ret < 0)

> +			return ret;

> +

> +		buf[i] = regval;

> +	}

> +

> +	/* Set 32MHz clock to be controlled by internal state machine */

> +	return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,

> +			    ADUX1020_FORCE_CLOCK_RESET);

> +}

> +

> +static int adux1020_set_mode(struct adux1020_data *data,

> +			     enum adux1020_op_modes mode)

> +{

> +	int ret;

> +

> +	/* Switch to standby mode before changing the mode */

> +	ret = regmap_write(data->regmap, ADUX1020_REG_OP_MODE,

> +			   ADUX1020_MODE_STANDBY);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Set data out and switch to the desired mode */

> +	switch (mode) {

> +	case ADUX1020_MODE_PROX_I:

> +		ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,

> +					 ADUX1020_DATA_OUT_MODE_MASK,

> +					 ADUX1020_DATA_OUT_PROX_I);

> +		if (ret < 0)

> +			return ret;

> +

> +		ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,

> +					 ADUX1020_OP_MODE_MASK,

> +					 ADUX1020_MODE_PROX_I);

> +		if (ret < 0)

> +			return ret;

> +		break;

> +	default:

> +		return -EINVAL;

> +	}

> +

> +	return 0;

> +}

> +

> +static int adux1020_measure(struct adux1020_data *data,

> +			    enum adux1020_op_modes mode,

> +			    u16 *val)

> +{

> +	unsigned int status;

> +	int ret, tries = 50;

> +

> +	/* Disable INT pin as polling is going to be used */

> +	ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,

> +			   ADUX1020_INT_DISABLE);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Enable mode interrupt */

> +	ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,

> +				 ADUX1020_MODE_INT_MASK,

> +				 adux1020_modes[mode].int_en);

> +	if (ret < 0)

> +		return ret;

> +

> +	while (tries--) {

> +		ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS,

> +				  &status);

> +		if (ret < 0)

> +			return ret;

> +

> +		status &= ADUX1020_FIFO_STATUS_MASK;

> +		if (status >= adux1020_modes[mode].bytes)

> +			break;

> +		msleep(20);

> +	}

> +

> +	if (tries < 0)

> +		return -EIO;

> +

> +	ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Clear mode interrupt */

> +	ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,

> +			   (~adux1020_modes[mode].int_en));

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Disable mode interrupts */

> +	return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,

> +				  ADUX1020_MODE_INT_MASK,

> +				  ADUX1020_MODE_INT_DISABLE);

> +}

> +

> +static int adux1020_read_raw(struct iio_dev *indio_dev,

> +			     struct iio_chan_spec const *chan,

> +			     int *val, int *val2, long mask)

> +{

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	u16 buf[3];

> +	int ret = -EINVAL;

> +	unsigned int regval;

> +

> +	mutex_lock(&data->lock);

> +

> +	switch (mask) {

> +	case IIO_CHAN_INFO_RAW:

> +		switch (chan->type) {

> +		case IIO_PROXIMITY:

> +			ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);

> +			if (ret < 0)

> +				goto fail;

> +

> +			ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf);

> +			if (ret < 0)

> +				goto fail;

> +

> +			*val = buf[0];

> +			ret = IIO_VAL_INT;

> +			break;

> +		default:

> +			break;

> +		}

> +		break;

> +	case IIO_CHAN_INFO_PROCESSED:

> +		switch (chan->type) {

> +		case IIO_CURRENT:

> +			ret = regmap_read(data->regmap,

> +					  ADUX1020_REG_LED_CURRENT, &regval);

> +			if (ret < 0)

> +				goto fail;

> +

> +			regval = regval & ADUX1020_LED_CURRENT_MASK;

> +

> +			*val = adux1020_led_currents[regval][0];

> +			*val2 = adux1020_led_currents[regval][1];

> +

> +			ret = IIO_VAL_INT_PLUS_MICRO;

> +			break;

> +		default:

> +			break;

> +		}

> +		break;

> +	case IIO_CHAN_INFO_SAMP_FREQ:

> +		switch (chan->type) {

> +		case IIO_PROXIMITY:

> +			ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY,

> +					  &regval);

> +			if (ret < 0)

> +				goto fail;

> +

> +			regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval);

> +

> +			*val = adux1020_rates[regval][0];

> +			*val2 = adux1020_rates[regval][1];

> +

> +			ret = IIO_VAL_INT_PLUS_MICRO;

> +			break;

> +		default:

> +			break;

> +		}

> +		break;

> +	default:

> +		break;

> +	}

> +

> +fail:

> +	mutex_unlock(&data->lock);

> +

> +	return ret;

> +};

> +

> +static inline int adux1020_find_index(const int array[][2], int count, int val,

> +				      int val2)

> +{

> +	int i;

> +

> +	for (i = 0; i < count; i++)

> +		if (val == array[i][0] && val2 == array[i][1])

> +			return i;

> +

> +	return -EINVAL;

> +}

> +

> +static int adux1020_write_raw(struct iio_dev *indio_dev,

> +			      struct iio_chan_spec const *chan,

> +			      int val, int val2, long mask)

> +{

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	int i, ret = -EINVAL;

> +

> +	mutex_lock(&data->lock);

> +

> +	switch (mask) {

> +	case IIO_CHAN_INFO_SAMP_FREQ:

> +		if (chan->type == IIO_PROXIMITY) {

> +			i = adux1020_find_index(adux1020_rates,

> +						ARRAY_SIZE(adux1020_rates),

> +						val, val2);

> +			if (i < 0) {

> +				ret = i;

> +				goto fail;

> +			}

> +

> +			ret = regmap_update_bits(data->regmap,

> +						 ADUX1020_REG_FREQUENCY,

> +						 ADUX1020_PROX_FREQ_MASK,

> +						 ADUX1020_PROX_FREQ(i));

> +		}

> +		break;

> +	case IIO_CHAN_INFO_PROCESSED:

> +		if (chan->type == IIO_CURRENT) {

> +			i = adux1020_find_index(adux1020_led_currents,

> +					ARRAY_SIZE(adux1020_led_currents),

> +					val, val2);

> +			if (i < 0) {

> +				ret = i;

> +				goto fail;

> +			}

> +

> +			ret = regmap_update_bits(data->regmap,

> +						 ADUX1020_REG_LED_CURRENT,

> +						 ADUX1020_LED_CURRENT_MASK, i);

> +		}

> +		break;

> +	default:

> +		break;

> +	}

> +

> +fail:

> +	mutex_unlock(&data->lock);

> +

> +	return ret;

> +}

> +

> +static int adux1020_write_event_config(struct iio_dev *indio_dev,

> +				       const struct iio_chan_spec *chan,

> +				       enum iio_event_type type,

> +				       enum iio_event_direction dir, int state)

> +{

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	int ret, mask;

> +

> +	mutex_lock(&data->lock);

> +

> +	ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,

> +			   ADUX1020_INT_ENABLE);

> +	if (ret < 0)

> +		goto fail;

> +

> +	ret = regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0);

> +	if (ret < 0)

> +		goto fail;

> +

> +	switch (chan->type) {

> +	case IIO_PROXIMITY:

> +		if (dir == IIO_EV_DIR_RISING)

> +			mask = ADUX1020_PROX_ON1_INT;

> +		else

> +			mask = ADUX1020_PROX_OFF1_INT;

> +

> +		if (state)

> +			state = 0;

> +		else

> +			state = mask;

> +

> +		ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,

> +					 mask, state);

> +		if (ret < 0)

> +			goto fail;

> +

> +		/*

> +		 * Trigger proximity interrupt when the intensity is above

> +		 * or below threshold

> +		 */

> +		ret = regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE,

> +					 ADUX1020_PROX_TYPE,

> +					 ADUX1020_PROX_TYPE);

> +		if (ret < 0)

> +			goto fail;

> +

> +		/* Set proximity mode */

> +		ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);

> +		break;

> +	default:

> +		ret = -EINVAL;

> +		break;

> +	}

> +

> +fail:

> +	mutex_unlock(&data->lock);

> +

> +	return ret;

> +}

> +

> +static int adux1020_read_event_config(struct iio_dev *indio_dev,

> +				      const struct iio_chan_spec *chan,

> +				      enum iio_event_type type,

> +				      enum iio_event_direction dir)

> +{

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	int ret, mask;

> +	unsigned int regval;

> +

> +	switch (chan->type) {

> +	case IIO_PROXIMITY:

> +		if (dir == IIO_EV_DIR_RISING)

> +			mask = ADUX1020_PROX_ON1_INT;

> +		else

> +			mask = ADUX1020_PROX_OFF1_INT;

> +		break;

> +	default:

> +		return -EINVAL;

> +	}

> +

> +	ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, &regval);

> +	if (ret < 0)

> +		return ret;

> +

> +	return !(regval & mask);

> +}

> +

> +static int adux1020_read_thresh(struct iio_dev *indio_dev,

> +				const struct iio_chan_spec *chan,

> +				enum iio_event_type type,

> +				enum iio_event_direction dir,

> +				enum iio_event_info info, int *val, int *val2)

> +{

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	u8 reg;

> +	int ret;

> +	unsigned int regval;

> +

> +	switch (chan->type) {

> +	case IIO_PROXIMITY:

> +		if (dir == IIO_EV_DIR_RISING)

> +			reg = ADUX1020_REG_PROX_TH_ON1;

> +		else

> +			reg = ADUX1020_REG_PROX_TH_OFF1;

> +		break;

> +	default:

> +		return -EINVAL;

> +	}

> +

> +	ret = regmap_read(data->regmap, reg, &regval);

> +	if (ret < 0)

> +		return ret;

> +

> +	*val = regval;

> +

> +	return IIO_VAL_INT;

> +}

> +

> +static int adux1020_write_thresh(struct iio_dev *indio_dev,

> +				 const struct iio_chan_spec *chan,

> +				 enum iio_event_type type,

> +				 enum iio_event_direction dir,

> +				 enum iio_event_info info, int val, int val2)

> +{

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	u8 reg;

> +

> +	switch (chan->type) {

> +	case IIO_PROXIMITY:

> +		if (dir == IIO_EV_DIR_RISING)

> +			reg = ADUX1020_REG_PROX_TH_ON1;

> +		else

> +			reg = ADUX1020_REG_PROX_TH_OFF1;

> +		break;

> +	default:

> +		return -EINVAL;

> +	}

> +

> +	/* Full scale threshold value is 0-65535  */

> +	if (val < 0 || val > 65535)

> +		return -EINVAL;

> +

> +	return regmap_write(data->regmap, reg, val);

> +}

> +

> +static const struct iio_event_spec adux1020_proximity_event[] = {

> +	{

> +		.type = IIO_EV_TYPE_THRESH,

> +		.dir = IIO_EV_DIR_RISING,

> +		.mask_separate = BIT(IIO_EV_INFO_VALUE) |

> +			BIT(IIO_EV_INFO_ENABLE),

> +	},

> +	{

> +		.type = IIO_EV_TYPE_THRESH,

> +		.dir = IIO_EV_DIR_FALLING,

> +		.mask_separate = BIT(IIO_EV_INFO_VALUE) |

> +			BIT(IIO_EV_INFO_ENABLE),

> +	},

> +};

> +

> +static const struct iio_chan_spec adux1020_channels[] = {

> +	{

> +		.type = IIO_PROXIMITY,

> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |

> +				      BIT(IIO_CHAN_INFO_SAMP_FREQ),

> +		.event_spec = adux1020_proximity_event,

> +		.num_event_specs = ARRAY_SIZE(adux1020_proximity_event),

> +	},

> +	{

> +		.type = IIO_CURRENT,

> +		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),

> +		.extend_name = "led",

> +		.output = 1,

> +	},

> +};

> +

> +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(

> +		      "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400");

> +

> +static struct attribute *adux1020_attributes[] = {

> +	&iio_const_attr_sampling_frequency_available.dev_attr.attr,

> +	NULL

> +};

> +

> +static const struct attribute_group adux1020_attribute_group = {

> +	.attrs = adux1020_attributes,

> +};

> +

> +static const struct iio_info adux1020_info = {

> +	.attrs = &adux1020_attribute_group,

> +	.read_raw = adux1020_read_raw,

> +	.write_raw = adux1020_write_raw,

> +	.read_event_config = adux1020_read_event_config,

> +	.write_event_config = adux1020_write_event_config,

> +	.read_event_value = adux1020_read_thresh,

> +	.write_event_value = adux1020_write_thresh,

> +};

> +

> +static irqreturn_t adux1020_interrupt_handler(int irq, void *private)

> +{

> +	struct iio_dev *indio_dev = private;

> +	struct adux1020_data *data = iio_priv(indio_dev);

> +	int ret, status;

> +

> +	ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status);

> +	if (ret < 0)

> +		return IRQ_HANDLED;

> +

> +	status &= ADUX1020_MODE_INT_STATUS_MASK;

> +

> +	if (status & ADUX1020_INT_PROX_ON1) {

> +		iio_push_event(indio_dev,

> +			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,

> +						    IIO_EV_TYPE_THRESH,

> +						    IIO_EV_DIR_RISING),

> +			       iio_get_time_ns(indio_dev));

> +	}

> +

> +	if (status & ADUX1020_INT_PROX_OFF1) {

> +		iio_push_event(indio_dev,

> +			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,

> +						    IIO_EV_TYPE_THRESH,

> +						    IIO_EV_DIR_FALLING),

> +			       iio_get_time_ns(indio_dev));

> +	}

> +

> +	regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS,

> +			   ADUX1020_MODE_INT_MASK, ADUX1020_INT_CLEAR);

> +

> +	return IRQ_HANDLED;

> +}

> +

> +static int adux1020_chip_init(struct adux1020_data *data)

> +{

> +	struct i2c_client *client = data->client;

> +	int ret;

> +	unsigned int val;

> +

> +	ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val);

> +	if (ret < 0)

> +		return ret;

> +

> +	if ((val & ADUX1020_CHIP_ID_MASK) != ADUX1020_CHIP_ID) {

> +		dev_err(&client->dev, "invalid chip id 0x%04x\n", val);

> +		return -ENODEV;

> +	};

> +

> +	dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val);

> +

> +	ret = regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET,

> +				 ADUX1020_SW_RESET, ADUX1020_SW_RESET);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Load default configuration */

> +	ret = regmap_multi_reg_write(data->regmap, adux1020_def_conf,

> +				     ARRAY_SIZE(adux1020_def_conf));

> +	if (ret < 0)

> +		return ret;

> +

> +	ret = adux1020_flush_fifo(data);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Use LED_IREF for proximity mode */

> +	ret = regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT,

> +				 ADUX1020_LED_PIREF_EN, 0);

> +	if (ret < 0)

> +		return ret;

> +

> +	/* Mask all interrupts */

> +	return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,

> +			   ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE);

> +}

> +

> +static int adux1020_probe(struct i2c_client *client,

> +			  const struct i2c_device_id *id)

> +{

> +	struct adux1020_data *data;

> +	struct iio_dev *indio_dev;

> +	int ret;

> +

> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));

> +	if (!indio_dev)

> +		return -ENOMEM;

> +

> +	indio_dev->dev.parent = &client->dev;

> +	indio_dev->info = &adux1020_info;

> +	indio_dev->name = ADUX1020_DRV_NAME;

> +	indio_dev->channels = adux1020_channels;

> +	indio_dev->num_channels = ARRAY_SIZE(adux1020_channels);

> +	indio_dev->modes = INDIO_DIRECT_MODE;

> +

> +	data = iio_priv(indio_dev);

> +

> +	data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config);

> +	if (IS_ERR(data->regmap)) {

> +		dev_err(&client->dev, "regmap initialization failed.\n");

> +		return PTR_ERR(data->regmap);

> +	}

> +

> +	data->client = client;

> +	data->indio_dev = indio_dev;

> +	mutex_init(&data->lock);

> +

> +	ret = adux1020_chip_init(data);

> +	if (ret)

> +		return ret;

> +

> +	if (client->irq) {

> +		ret = devm_request_threaded_irq(&client->dev, client->irq,

> +					NULL, adux1020_interrupt_handler,

> +					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,

> +					ADUX1020_DRV_NAME, indio_dev);

> +		if (ret) {

> +			dev_err(&client->dev, "irq request error %d\n", -ret);

> +			return ret;

> +		}

> +	}

> +

> +	return devm_iio_device_register(&client->dev, indio_dev);

> +}

> +

> +static const struct i2c_device_id adux1020_id[] = {

> +	{ "adux1020", 0 },

> +	{}

> +};

> +MODULE_DEVICE_TABLE(i2c, adux1020_id);

> +

> +static const struct of_device_id adux1020_of_match[] = {

> +	{ .compatible = "adi,adux1020" },

> +	{ }

> +};

> +MODULE_DEVICE_TABLE(of, adux1020_of_match);

> +

> +static struct i2c_driver adux1020_driver = {

> +	.driver = {

> +		.name	= ADUX1020_DRV_NAME,

> +		.of_match_table = adux1020_of_match,

> +	},

> +	.probe		= adux1020_probe,

> +	.id_table	= adux1020_id,

> +};

> +module_i2c_driver(adux1020_driver);

> +

> +MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");

> +MODULE_DESCRIPTION("ADUX1020 photometric sensor");

> +MODULE_LICENSE("GPL");
diff mbox series

Patch

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 08d7e1ef2186..3f8c8689cd89 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -32,6 +32,17 @@  config ADJD_S311
 	  This driver can also be built as a module.  If so, the module
 	  will be called adjd_s311.
 
+config ADUX1020
+	tristate "ADUX1020 photometric sensor"
+	select REGMAP_I2C
+	depends on I2C
+	help
+	 Say Y here if you want to build a driver for the Analog Devices
+	 ADUX1020 photometric sensor.
+
+	 To compile this driver as a module, choose M here: the
+	 module will be called adux1020.
+
 config AL3320A
 	tristate "AL3320A ambient light sensor"
 	depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 00d1f9b98f39..5d650ce46a40 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -6,6 +6,7 @@ 
 # When adding new entries keep the list in alphabetical order
 obj-$(CONFIG_ACPI_ALS)		+= acpi-als.o
 obj-$(CONFIG_ADJD_S311)		+= adjd_s311.o
+obj-$(CONFIG_ADUX1020)		+= adux1020.o
 obj-$(CONFIG_AL3320A)		+= al3320a.o
 obj-$(CONFIG_APDS9300)		+= apds9300.o
 obj-$(CONFIG_APDS9960)		+= apds9960.o
diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c
new file mode 100644
index 000000000000..830e5e95d58f
--- /dev/null
+++ b/drivers/iio/light/adux1020.c
@@ -0,0 +1,849 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor
+ *
+ * Copyright (C) 2019 Linaro Ltd.
+ * Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+ *
+ * TODO: Triggered buffer support
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+#define ADUX1020_REGMAP_NAME		"adux1020_regmap"
+#define ADUX1020_DRV_NAME		"adux1020"
+
+/* System registers */
+#define ADUX1020_REG_CHIP_ID		0x08
+#define ADUX1020_REG_SLAVE_ADDRESS	0x09
+
+#define ADUX1020_REG_SW_RESET		0x0f
+#define ADUX1020_REG_INT_ENABLE		0x1c
+#define ADUX1020_REG_INT_POLARITY	0x1d
+#define ADUX1020_REG_PROX_TH_ON1	0x2a
+#define ADUX1020_REG_PROX_TH_OFF1	0x2b
+#define	ADUX1020_REG_PROX_TYPE		0x2f
+#define	ADUX1020_REG_TEST_MODES_3	0x32
+#define	ADUX1020_REG_FORCE_MODE		0x33
+#define	ADUX1020_REG_FREQUENCY		0x40
+#define ADUX1020_REG_LED_CURRENT	0x41
+#define	ADUX1020_REG_OP_MODE		0x45
+#define	ADUX1020_REG_INT_MASK		0x48
+#define	ADUX1020_REG_INT_STATUS		0x49
+#define	ADUX1020_REG_DATA_BUFFER	0x60
+
+/* Chip ID bits */
+#define ADUX1020_CHIP_ID_MASK		GENMASK(11, 0)
+#define ADUX1020_CHIP_ID		0x03fc
+
+#define ADUX1020_SW_RESET		BIT(1)
+#define ADUX1020_FIFO_FLUSH		BIT(15)
+#define ADUX1020_OP_MODE_MASK		GENMASK(3, 0)
+#define ADUX1020_DATA_OUT_MODE_MASK	GENMASK(7, 4)
+#define ADUX1020_DATA_OUT_PROX_I	FIELD_PREP(ADUX1020_DATA_OUT_MODE_MASK, 1)
+
+#define ADUX1020_MODE_INT_MASK		GENMASK(7, 0)
+#define ADUX1020_INT_ENABLE		0x2094
+#define ADUX1020_INT_DISABLE		0x2090
+#define ADUX1020_PROX_INT_ENABLE	0x00f0
+#define ADUX1020_PROX_ON1_INT		BIT(0)
+#define ADUX1020_PROX_OFF1_INT		BIT(1)
+#define ADUX1020_FIFO_INT_ENABLE	0x7f
+#define ADUX1020_MODE_INT_DISABLE	0xff
+#define ADUX1020_MODE_INT_STATUS_MASK	GENMASK(7, 0)
+#define ADUX1020_FIFO_STATUS_MASK	GENMASK(15, 8)
+#define ADUX1020_INT_CLEAR		0xff
+#define ADUX1020_PROX_TYPE		BIT(15)
+
+#define ADUX1020_INT_PROX_ON1		BIT(0)
+#define ADUX1020_INT_PROX_OFF1		BIT(1)
+
+#define ADUX1020_FORCE_CLOCK_ON		0x0f4f
+#define ADUX1020_FORCE_CLOCK_RESET	0x0040
+#define ADUX1020_ACTIVE_4_STATE		0x0008
+
+#define ADUX1020_PROX_FREQ_MASK		GENMASK(7, 4)
+#define ADUX1020_PROX_FREQ(x)		FIELD_PREP(ADUX1020_PROX_FREQ_MASK, x)
+
+#define ADUX1020_LED_CURRENT_MASK	GENMASK(3, 0)
+#define ADUX1020_LED_PIREF_EN		BIT(12)
+
+/* Operating modes */
+enum adux1020_op_modes {
+	ADUX1020_MODE_STANDBY,
+	ADUX1020_MODE_PROX_I,
+	ADUX1020_MODE_PROX_XY,
+	ADUX1020_MODE_GEST,
+	ADUX1020_MODE_SAMPLE,
+	ADUX1020_MODE_FORCE = 0x0e,
+	ADUX1020_MODE_IDLE = 0x0f,
+};
+
+struct adux1020_data {
+	struct i2c_client *client;
+	struct iio_dev *indio_dev;
+	struct mutex lock;
+	struct regmap *regmap;
+};
+
+struct adux1020_mode_data {
+	u8 bytes;
+	u8 buf_len;
+	u16 int_en;
+};
+
+static const struct adux1020_mode_data adux1020_modes[] = {
+	[ADUX1020_MODE_PROX_I] = {
+		.bytes = 2,
+		.buf_len = 1,
+		.int_en = ADUX1020_PROX_INT_ENABLE,
+	},
+};
+
+static const struct regmap_config adux1020_regmap_config = {
+	.name = ADUX1020_REGMAP_NAME,
+	.reg_bits = 8,
+	.val_bits = 16,
+	.max_register = 0x6F,
+	.cache_type = REGCACHE_NONE,
+};
+
+static const struct reg_sequence adux1020_def_conf[] = {
+	{ 0x000c, 0x000f },
+	{ 0x0010, 0x1010 },
+	{ 0x0011, 0x004c },
+	{ 0x0012, 0x5f0c },
+	{ 0x0013, 0xada5 },
+	{ 0x0014, 0x0080 },
+	{ 0x0015, 0x0000 },
+	{ 0x0016, 0x0600 },
+	{ 0x0017, 0x0000 },
+	{ 0x0018, 0x2693 },
+	{ 0x0019, 0x0004 },
+	{ 0x001a, 0x4280 },
+	{ 0x001b, 0x0060 },
+	{ 0x001c, 0x2094 },
+	{ 0x001d, 0x0020 },
+	{ 0x001e, 0x0001 },
+	{ 0x001f, 0x0100 },
+	{ 0x0020, 0x0320 },
+	{ 0x0021, 0x0A13 },
+	{ 0x0022, 0x0320 },
+	{ 0x0023, 0x0113 },
+	{ 0x0024, 0x0000 },
+	{ 0x0025, 0x2412 },
+	{ 0x0026, 0x2412 },
+	{ 0x0027, 0x0022 },
+	{ 0x0028, 0x0000 },
+	{ 0x0029, 0x0300 },
+	{ 0x002a, 0x0700 },
+	{ 0x002b, 0x0600 },
+	{ 0x002c, 0x6000 },
+	{ 0x002d, 0x4000 },
+	{ 0x002e, 0x0000 },
+	{ 0x002f, 0x0000 },
+	{ 0x0030, 0x0000 },
+	{ 0x0031, 0x0000 },
+	{ 0x0032, 0x0040 },
+	{ 0x0033, 0x0008 },
+	{ 0x0034, 0xE400 },
+	{ 0x0038, 0x8080 },
+	{ 0x0039, 0x8080 },
+	{ 0x003a, 0x2000 },
+	{ 0x003b, 0x1f00 },
+	{ 0x003c, 0x2000 },
+	{ 0x003d, 0x2000 },
+	{ 0x003e, 0x0000 },
+	{ 0x0040, 0x8069 },
+	{ 0x0041, 0x1f2f },
+	{ 0x0042, 0x4000 },
+	{ 0x0043, 0x0000 },
+	{ 0x0044, 0x0008 },
+	{ 0x0046, 0x0000 },
+	{ 0x0048, 0x00ef },
+	{ 0x0049, 0x0000 },
+	{ 0x0045, 0x0000 },
+};
+
+static const int adux1020_rates[][2] = {
+	{ 0, 100000 },
+	{ 0, 200000 },
+	{ 0, 500000 },
+	{ 1, 0 },
+	{ 2, 0 },
+	{ 5, 0 },
+	{ 10, 0 },
+	{ 20, 0 },
+	{ 50, 0 },
+	{ 100, 0 },
+	{ 190, 0 },
+	{ 450, 0 },
+	{ 820, 0 },
+	{ 1400, 0 },
+};
+
+static const int adux1020_led_currents[][2] = {
+	{ 0, 25000 },
+	{ 0, 40000 },
+	{ 0, 55000 },
+	{ 0, 70000 },
+	{ 0, 85000 },
+	{ 0, 100000 },
+	{ 0, 115000 },
+	{ 0, 130000 },
+	{ 0, 145000 },
+	{ 0, 160000 },
+	{ 0, 175000 },
+	{ 0, 190000 },
+	{ 0, 205000 },
+	{ 0, 220000 },
+	{ 0, 235000 },
+	{ 0, 250000 },
+};
+
+static int adux1020_flush_fifo(struct adux1020_data *data)
+{
+	int ret;
+
+	/* Force Idle mode */
+	ret = regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE,
+			   ADUX1020_ACTIVE_4_STATE);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+				 ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+				 ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE);
+	if (ret < 0)
+		return ret;
+
+	/* Flush FIFO */
+	ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+			   ADUX1020_FORCE_CLOCK_ON);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,
+			   ADUX1020_FIFO_FLUSH);
+	if (ret < 0)
+		return ret;
+
+	return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+			    ADUX1020_FORCE_CLOCK_RESET);
+}
+
+static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len)
+{
+	unsigned int regval;
+	int i, ret;
+
+	/* Enable 32MHz clock */
+	ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+			   ADUX1020_FORCE_CLOCK_ON);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < buf_len; i++) {
+		ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER,
+				  &regval);
+		if (ret < 0)
+			return ret;
+
+		buf[i] = regval;
+	}
+
+	/* Set 32MHz clock to be controlled by internal state machine */
+	return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+			    ADUX1020_FORCE_CLOCK_RESET);
+}
+
+static int adux1020_set_mode(struct adux1020_data *data,
+			     enum adux1020_op_modes mode)
+{
+	int ret;
+
+	/* Switch to standby mode before changing the mode */
+	ret = regmap_write(data->regmap, ADUX1020_REG_OP_MODE,
+			   ADUX1020_MODE_STANDBY);
+	if (ret < 0)
+		return ret;
+
+	/* Set data out and switch to the desired mode */
+	switch (mode) {
+	case ADUX1020_MODE_PROX_I:
+		ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+					 ADUX1020_DATA_OUT_MODE_MASK,
+					 ADUX1020_DATA_OUT_PROX_I);
+		if (ret < 0)
+			return ret;
+
+		ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+					 ADUX1020_OP_MODE_MASK,
+					 ADUX1020_MODE_PROX_I);
+		if (ret < 0)
+			return ret;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int adux1020_measure(struct adux1020_data *data,
+			    enum adux1020_op_modes mode,
+			    u16 *val)
+{
+	unsigned int status;
+	int ret, tries = 50;
+
+	/* Disable INT pin as polling is going to be used */
+	ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,
+			   ADUX1020_INT_DISABLE);
+	if (ret < 0)
+		return ret;
+
+	/* Enable mode interrupt */
+	ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+				 ADUX1020_MODE_INT_MASK,
+				 adux1020_modes[mode].int_en);
+	if (ret < 0)
+		return ret;
+
+	while (tries--) {
+		ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS,
+				  &status);
+		if (ret < 0)
+			return ret;
+
+		status &= ADUX1020_FIFO_STATUS_MASK;
+		if (status >= adux1020_modes[mode].bytes)
+			break;
+		msleep(20);
+	}
+
+	if (tries < 0)
+		return -EIO;
+
+	ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len);
+	if (ret < 0)
+		return ret;
+
+	/* Clear mode interrupt */
+	ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,
+			   (~adux1020_modes[mode].int_en));
+	if (ret < 0)
+		return ret;
+
+	/* Disable mode interrupts */
+	return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+				  ADUX1020_MODE_INT_MASK,
+				  ADUX1020_MODE_INT_DISABLE);
+}
+
+static int adux1020_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int *val, int *val2, long mask)
+{
+	struct adux1020_data *data = iio_priv(indio_dev);
+	u16 buf[3];
+	int ret = -EINVAL;
+	unsigned int regval;
+
+	mutex_lock(&data->lock);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		switch (chan->type) {
+		case IIO_PROXIMITY:
+			ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);
+			if (ret < 0)
+				goto fail;
+
+			ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf);
+			if (ret < 0)
+				goto fail;
+
+			*val = buf[0];
+			ret = IIO_VAL_INT;
+			break;
+		default:
+			break;
+		}
+		break;
+	case IIO_CHAN_INFO_PROCESSED:
+		switch (chan->type) {
+		case IIO_CURRENT:
+			ret = regmap_read(data->regmap,
+					  ADUX1020_REG_LED_CURRENT, &regval);
+			if (ret < 0)
+				goto fail;
+
+			regval = regval & ADUX1020_LED_CURRENT_MASK;
+
+			*val = adux1020_led_currents[regval][0];
+			*val2 = adux1020_led_currents[regval][1];
+
+			ret = IIO_VAL_INT_PLUS_MICRO;
+			break;
+		default:
+			break;
+		}
+		break;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		switch (chan->type) {
+		case IIO_PROXIMITY:
+			ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY,
+					  &regval);
+			if (ret < 0)
+				goto fail;
+
+			regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval);
+
+			*val = adux1020_rates[regval][0];
+			*val2 = adux1020_rates[regval][1];
+
+			ret = IIO_VAL_INT_PLUS_MICRO;
+			break;
+		default:
+			break;
+		}
+		break;
+	default:
+		break;
+	}
+
+fail:
+	mutex_unlock(&data->lock);
+
+	return ret;
+};
+
+static inline int adux1020_find_index(const int array[][2], int count, int val,
+				      int val2)
+{
+	int i;
+
+	for (i = 0; i < count; i++)
+		if (val == array[i][0] && val2 == array[i][1])
+			return i;
+
+	return -EINVAL;
+}
+
+static int adux1020_write_raw(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      int val, int val2, long mask)
+{
+	struct adux1020_data *data = iio_priv(indio_dev);
+	int i, ret = -EINVAL;
+
+	mutex_lock(&data->lock);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		if (chan->type == IIO_PROXIMITY) {
+			i = adux1020_find_index(adux1020_rates,
+						ARRAY_SIZE(adux1020_rates),
+						val, val2);
+			if (i < 0) {
+				ret = i;
+				goto fail;
+			}
+
+			ret = regmap_update_bits(data->regmap,
+						 ADUX1020_REG_FREQUENCY,
+						 ADUX1020_PROX_FREQ_MASK,
+						 ADUX1020_PROX_FREQ(i));
+		}
+		break;
+	case IIO_CHAN_INFO_PROCESSED:
+		if (chan->type == IIO_CURRENT) {
+			i = adux1020_find_index(adux1020_led_currents,
+					ARRAY_SIZE(adux1020_led_currents),
+					val, val2);
+			if (i < 0) {
+				ret = i;
+				goto fail;
+			}
+
+			ret = regmap_update_bits(data->regmap,
+						 ADUX1020_REG_LED_CURRENT,
+						 ADUX1020_LED_CURRENT_MASK, i);
+		}
+		break;
+	default:
+		break;
+	}
+
+fail:
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int adux1020_write_event_config(struct iio_dev *indio_dev,
+				       const struct iio_chan_spec *chan,
+				       enum iio_event_type type,
+				       enum iio_event_direction dir, int state)
+{
+	struct adux1020_data *data = iio_priv(indio_dev);
+	int ret, mask;
+
+	mutex_lock(&data->lock);
+
+	ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,
+			   ADUX1020_INT_ENABLE);
+	if (ret < 0)
+		goto fail;
+
+	ret = regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0);
+	if (ret < 0)
+		goto fail;
+
+	switch (chan->type) {
+	case IIO_PROXIMITY:
+		if (dir == IIO_EV_DIR_RISING)
+			mask = ADUX1020_PROX_ON1_INT;
+		else
+			mask = ADUX1020_PROX_OFF1_INT;
+
+		if (state)
+			state = 0;
+		else
+			state = mask;
+
+		ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+					 mask, state);
+		if (ret < 0)
+			goto fail;
+
+		/*
+		 * Trigger proximity interrupt when the intensity is above
+		 * or below threshold
+		 */
+		ret = regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE,
+					 ADUX1020_PROX_TYPE,
+					 ADUX1020_PROX_TYPE);
+		if (ret < 0)
+			goto fail;
+
+		/* Set proximity mode */
+		ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+fail:
+	mutex_unlock(&data->lock);
+
+	return ret;
+}
+
+static int adux1020_read_event_config(struct iio_dev *indio_dev,
+				      const struct iio_chan_spec *chan,
+				      enum iio_event_type type,
+				      enum iio_event_direction dir)
+{
+	struct adux1020_data *data = iio_priv(indio_dev);
+	int ret, mask;
+	unsigned int regval;
+
+	switch (chan->type) {
+	case IIO_PROXIMITY:
+		if (dir == IIO_EV_DIR_RISING)
+			mask = ADUX1020_PROX_ON1_INT;
+		else
+			mask = ADUX1020_PROX_OFF1_INT;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, &regval);
+	if (ret < 0)
+		return ret;
+
+	return !(regval & mask);
+}
+
+static int adux1020_read_thresh(struct iio_dev *indio_dev,
+				const struct iio_chan_spec *chan,
+				enum iio_event_type type,
+				enum iio_event_direction dir,
+				enum iio_event_info info, int *val, int *val2)
+{
+	struct adux1020_data *data = iio_priv(indio_dev);
+	u8 reg;
+	int ret;
+	unsigned int regval;
+
+	switch (chan->type) {
+	case IIO_PROXIMITY:
+		if (dir == IIO_EV_DIR_RISING)
+			reg = ADUX1020_REG_PROX_TH_ON1;
+		else
+			reg = ADUX1020_REG_PROX_TH_OFF1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_read(data->regmap, reg, &regval);
+	if (ret < 0)
+		return ret;
+
+	*val = regval;
+
+	return IIO_VAL_INT;
+}
+
+static int adux1020_write_thresh(struct iio_dev *indio_dev,
+				 const struct iio_chan_spec *chan,
+				 enum iio_event_type type,
+				 enum iio_event_direction dir,
+				 enum iio_event_info info, int val, int val2)
+{
+	struct adux1020_data *data = iio_priv(indio_dev);
+	u8 reg;
+
+	switch (chan->type) {
+	case IIO_PROXIMITY:
+		if (dir == IIO_EV_DIR_RISING)
+			reg = ADUX1020_REG_PROX_TH_ON1;
+		else
+			reg = ADUX1020_REG_PROX_TH_OFF1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Full scale threshold value is 0-65535  */
+	if (val < 0 || val > 65535)
+		return -EINVAL;
+
+	return regmap_write(data->regmap, reg, val);
+}
+
+static const struct iio_event_spec adux1020_proximity_event[] = {
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_RISING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	},
+	{
+		.type = IIO_EV_TYPE_THRESH,
+		.dir = IIO_EV_DIR_FALLING,
+		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
+			BIT(IIO_EV_INFO_ENABLE),
+	},
+};
+
+static const struct iio_chan_spec adux1020_channels[] = {
+	{
+		.type = IIO_PROXIMITY,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.event_spec = adux1020_proximity_event,
+		.num_event_specs = ARRAY_SIZE(adux1020_proximity_event),
+	},
+	{
+		.type = IIO_CURRENT,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+		.extend_name = "led",
+		.output = 1,
+	},
+};
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
+		      "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400");
+
+static struct attribute *adux1020_attributes[] = {
+	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group adux1020_attribute_group = {
+	.attrs = adux1020_attributes,
+};
+
+static const struct iio_info adux1020_info = {
+	.attrs = &adux1020_attribute_group,
+	.read_raw = adux1020_read_raw,
+	.write_raw = adux1020_write_raw,
+	.read_event_config = adux1020_read_event_config,
+	.write_event_config = adux1020_write_event_config,
+	.read_event_value = adux1020_read_thresh,
+	.write_event_value = adux1020_write_thresh,
+};
+
+static irqreturn_t adux1020_interrupt_handler(int irq, void *private)
+{
+	struct iio_dev *indio_dev = private;
+	struct adux1020_data *data = iio_priv(indio_dev);
+	int ret, status;
+
+	ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status);
+	if (ret < 0)
+		return IRQ_HANDLED;
+
+	status &= ADUX1020_MODE_INT_STATUS_MASK;
+
+	if (status & ADUX1020_INT_PROX_ON1) {
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_RISING),
+			       iio_get_time_ns(indio_dev));
+	}
+
+	if (status & ADUX1020_INT_PROX_OFF1) {
+		iio_push_event(indio_dev,
+			       IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+						    IIO_EV_TYPE_THRESH,
+						    IIO_EV_DIR_FALLING),
+			       iio_get_time_ns(indio_dev));
+	}
+
+	regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS,
+			   ADUX1020_MODE_INT_MASK, ADUX1020_INT_CLEAR);
+
+	return IRQ_HANDLED;
+}
+
+static int adux1020_chip_init(struct adux1020_data *data)
+{
+	struct i2c_client *client = data->client;
+	int ret;
+	unsigned int val;
+
+	ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val);
+	if (ret < 0)
+		return ret;
+
+	if ((val & ADUX1020_CHIP_ID_MASK) != ADUX1020_CHIP_ID) {
+		dev_err(&client->dev, "invalid chip id 0x%04x\n", val);
+		return -ENODEV;
+	};
+
+	dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val);
+
+	ret = regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET,
+				 ADUX1020_SW_RESET, ADUX1020_SW_RESET);
+	if (ret < 0)
+		return ret;
+
+	/* Load default configuration */
+	ret = regmap_multi_reg_write(data->regmap, adux1020_def_conf,
+				     ARRAY_SIZE(adux1020_def_conf));
+	if (ret < 0)
+		return ret;
+
+	ret = adux1020_flush_fifo(data);
+	if (ret < 0)
+		return ret;
+
+	/* Use LED_IREF for proximity mode */
+	ret = regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT,
+				 ADUX1020_LED_PIREF_EN, 0);
+	if (ret < 0)
+		return ret;
+
+	/* Mask all interrupts */
+	return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+			   ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE);
+}
+
+static int adux1020_probe(struct i2c_client *client,
+			  const struct i2c_device_id *id)
+{
+	struct adux1020_data *data;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	indio_dev->dev.parent = &client->dev;
+	indio_dev->info = &adux1020_info;
+	indio_dev->name = ADUX1020_DRV_NAME;
+	indio_dev->channels = adux1020_channels;
+	indio_dev->num_channels = ARRAY_SIZE(adux1020_channels);
+	indio_dev->modes = INDIO_DIRECT_MODE;
+
+	data = iio_priv(indio_dev);
+
+	data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config);
+	if (IS_ERR(data->regmap)) {
+		dev_err(&client->dev, "regmap initialization failed.\n");
+		return PTR_ERR(data->regmap);
+	}
+
+	data->client = client;
+	data->indio_dev = indio_dev;
+	mutex_init(&data->lock);
+
+	ret = adux1020_chip_init(data);
+	if (ret)
+		return ret;
+
+	if (client->irq) {
+		ret = devm_request_threaded_irq(&client->dev, client->irq,
+					NULL, adux1020_interrupt_handler,
+					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+					ADUX1020_DRV_NAME, indio_dev);
+		if (ret) {
+			dev_err(&client->dev, "irq request error %d\n", -ret);
+			return ret;
+		}
+	}
+
+	return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id adux1020_id[] = {
+	{ "adux1020", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, adux1020_id);
+
+static const struct of_device_id adux1020_of_match[] = {
+	{ .compatible = "adi,adux1020" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, adux1020_of_match);
+
+static struct i2c_driver adux1020_driver = {
+	.driver = {
+		.name	= ADUX1020_DRV_NAME,
+		.of_match_table = adux1020_of_match,
+	},
+	.probe		= adux1020_probe,
+	.id_table	= adux1020_id,
+};
+module_i2c_driver(adux1020_driver);
+
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
+MODULE_DESCRIPTION("ADUX1020 photometric sensor");
+MODULE_LICENSE("GPL");