Re: [PATCH v3] iio:light: Add support for STMicro VL6180 sensor

[Jonathan Cameron <jic23-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

On 19/03/17 14:53, Manivannan Sadhasivam wrote:
> This patch adds support for STMicro VL6180 - ALS, range and proximity sensor. Sensor is capable of measuring the light
> intensity as well as object distance using TOF (Time of Flight) technology.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannanece23-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> Signed-off-by: Peter Meerwald-Stadler <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>
> Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

There were a couple of minor formatting bits and bobs that checkpatch
threw up so I fixed those whilst applying.

Left a few overly long lines, so we may well get some patches from others
for those.

Thanks,

Jonathan
> ---
> 
> Changes in v3:
> 
> 1. Changed the false reset handling. Instead of error out, logging is adapted
> 
> Changes in v2:
> 
> 1. Specified range in comments and Kconfig
> 2. Used cpu_to_be16 for endianess conversion
> 3. Fixed typos
> 4. Added necessary comments
> 5. Added Peter's signed-off-by:
> 
>  .../devicetree/bindings/iio/light/vl6180.txt       |  16 +
>  drivers/iio/light/Kconfig                          |  10 +
>  drivers/iio/light/Makefile                         |   1 +
>  drivers/iio/light/vl6180.c                         | 538 +++++++++++++++++++++
>  4 files changed, 565 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/light/vl6180.txt
>  create mode 100644 drivers/iio/light/vl6180.c
> 
> diff --git a/Documentation/devicetree/bindings/iio/light/vl6180.txt b/Documentation/devicetree/bindings/iio/light/vl6180.txt
> new file mode 100644
> index 0000000..8f77ccd
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/light/vl6180.txt
> @@ -0,0 +1,16 @@
> +STMicro VL6180 -  ALS, range and proximity sensor
> +
> +Link to datasheet: http://www.st.com/resource/en/datasheet/vl6180x.pdf
> +
> +Required properties:
> +
> +	-compatible: should be "st,vl6180"
> +	-reg: the I2C address of the sensor
> +
> +Example:
> +
> +vl6180@29 {
> +	compatible = "st,vl6180";
> +	reg = <0x29>;
> +};
> +	
> diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
> index 7c566f5..aec04ef 100644
> --- a/drivers/iio/light/Kconfig
> +++ b/drivers/iio/light/Kconfig
> @@ -352,4 +352,14 @@ config VEML6070
>  	 To compile this driver as a module, choose M here: the
>  	 module will be called veml6070.
>  
> +config VL6180
> +	tristate "VL6180 ALS, range and proximity sensor"
> +	depends on I2C
> +	help
> +	 Say Y here if you want to build a driver for the STMicroelectronics
> +	 VL6180 combined ambient light, range and proximity sensor.
> +
> +	 To compile this driver as a module, choose M here: the
> +	 module will be called vl6180.
> +
>  endmenu
> diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
> index 6f2a3c6..24a8d72 100644
> --- a/drivers/iio/light/Makefile
> +++ b/drivers/iio/light/Makefile
> @@ -33,3 +33,4 @@ obj-$(CONFIG_TSL4531)		+= tsl4531.o
>  obj-$(CONFIG_US5182D)		+= us5182d.o
>  obj-$(CONFIG_VCNL4000)		+= vcnl4000.o
>  obj-$(CONFIG_VEML6070)		+= veml6070.o
> +obj-$(CONFIG_VL6180)		+= vl6180.o
> diff --git a/drivers/iio/light/vl6180.c b/drivers/iio/light/vl6180.c
> new file mode 100644
> index 0000000..6bfdca3
> --- /dev/null
> +++ b/drivers/iio/light/vl6180.c
> @@ -0,0 +1,538 @@
> +/*
> + * vl6180.c - Support for STMicroelectronics VL6180 ALS, range and proximity sensor
> + *
> + * Copyright 2017 Peter Meerwald-Stadler <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>
> + * Copyright 2017 Manivannan Sadhasivam <manivannanece23-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> + *
> + * This file is subject to the terms and conditions of version 2 of
> + * the GNU General Public License.  See the file COPYING in the main
> + * directory of this archive for more details.
> + *
> + * IIO driver for VL6180 (7-bit I2C slave address 0x29)
> + *
> + * Range: 0 to 100mm
> + * ALS: < 1 Lux up to 100 kLux
> + * IR: 850nm
> + *
> + * TODO: irq, threshold events, continuous mode, hardware buffer
> + */
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/mutex.h>
> +#include <linux/err.h>
> +#include <linux/of.h>
> +#include <linux/delay.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +#define VL6180_DRV_NAME "vl6180"
> +
> +/* Device identification register and value */
> +#define VL6180_MODEL_ID	0x000
> +#define VL6180_MODEL_ID_VAL 0xb4
> +
> +/* Configuration registers */
> +#define VL6180_INTR_CONFIG 0x014
> +#define VL6180_INTR_CLEAR 0x015
> +#define VL6180_OUT_OF_RESET 0x016
> +#define VL6180_HOLD 0x017
> +#define VL6180_RANGE_START 0x018
> +#define VL6180_ALS_START 0x038
> +#define VL6180_ALS_GAIN 0x03f
> +#define VL6180_ALS_IT 0x040
> +
> +/* Status registers */
> +#define VL6180_RANGE_STATUS 0x04d
> +#define VL6180_ALS_STATUS 0x04e
> +#define VL6180_INTR_STATUS 0x04f
> +
> +/* Result value registers */
> +#define VL6180_ALS_VALUE 0x050
> +#define VL6180_RANGE_VALUE 0x062
> +#define VL6180_RANGE_RATE 0x066
> +
> +/* bits of the RANGE_START and ALS_START register */
> +#define VL6180_MODE_CONT BIT(1) /* continuous mode */
> +#define VL6180_STARTSTOP BIT(0) /* start measurement, auto-reset */
> +
> +/* bits of the INTR_STATUS and INTR_CONFIG register */
> +#define VL6180_ALS_READY BIT(5)
> +#define VL6180_RANGE_READY BIT(2)
> +
> +/* bits of the INTR_CLEAR register */
> +#define VL6180_CLEAR_ERROR BIT(2)
> +#define VL6180_CLEAR_ALS BIT(1)
> +#define VL6180_CLEAR_RANGE BIT(0)
> +
> +/* bits of the HOLD register */
> +#define VL6180_HOLD_ON BIT(0)
> +
> +/* default value for the ALS_IT register */
> +#define VL6180_ALS_IT_100 0x63 /* 100 ms */
> +
> +/* values for the ALS_GAIN register */
> +#define VL6180_ALS_GAIN_1 0x46
> +#define VL6180_ALS_GAIN_1_25 0x45
> +#define VL6180_ALS_GAIN_1_67 0x44
> +#define VL6180_ALS_GAIN_2_5 0x43
> +#define VL6180_ALS_GAIN_5 0x42
> +#define VL6180_ALS_GAIN_10 0x41
> +#define VL6180_ALS_GAIN_20 0x40
> +#define VL6180_ALS_GAIN_40 0x47
> +
> +struct vl6180_data {
> +	struct i2c_client *client;
> +	struct mutex lock;
> +};
> +
> +enum { VL6180_ALS, VL6180_RANGE, VL6180_PROX };
> +
> +/**
> + * struct vl6180_chan_regs - Registers for accessing channels
> + * @drdy_mask:			Data ready bit in status register
> + * @start_reg:			Conversion start register
> + * @value_reg:			Result value register
> + * @word:			Register word length
> + */
> +struct vl6180_chan_regs {
> +	u8 drdy_mask;
> +	u16 start_reg, value_reg;
> +	bool word;
> +};
> +
> +static const struct vl6180_chan_regs vl6180_chan_regs_table[] = {
> +	[VL6180_ALS] = {
> +		.drdy_mask = VL6180_ALS_READY,
> +		.start_reg = VL6180_ALS_START,
> +		.value_reg = VL6180_ALS_VALUE,
> +		.word = true,
> +	},
> +	[VL6180_RANGE] = {
> +		.drdy_mask = VL6180_RANGE_READY,
> +		.start_reg = VL6180_RANGE_START,
> +		.value_reg = VL6180_RANGE_VALUE,
> +		.word = false,
> +	},
> +	[VL6180_PROX] = {
> +		.drdy_mask = VL6180_RANGE_READY,
> +		.start_reg = VL6180_RANGE_START,
> +		.value_reg = VL6180_RANGE_RATE,
> +		.word = true,
> +	},
> +};
> +
> +static int vl6180_read(struct i2c_client *client, u16 cmd, void *databuf,
> +		       u8 len)
> +{
> +	__be16 cmdbuf = cpu_to_be16(cmd);
> +	struct i2c_msg msgs[2] = {
> +		{ .addr = client->addr, .len = sizeof(cmdbuf), .buf = (u8 *) &cmdbuf },
> +		{ .addr = client->addr, .len = len, .buf = databuf,
> +		  .flags = I2C_M_RD } };
> +	int ret;
> +
> +	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> +	if (ret < 0)
> +		dev_err(&client->dev, "failed reading register 0x%04x\n", cmd);
> +
> +	return ret;
> +}
> +
> +static int vl6180_read_byte(struct i2c_client *client, u16 cmd)
> +{
> +	u8 data;
> +	int ret;
> +
> +	ret = vl6180_read(client, cmd, &data, sizeof(data));
> +	if (ret < 0)
> +		return ret;
> +
> +	return data;
> +}
> +
> +static int vl6180_read_word(struct i2c_client *client, u16 cmd)
> +{
> +	__be16 data;
> +	int ret;
> +
> +	ret = vl6180_read(client, cmd, &data, sizeof(data));
> +	if (ret < 0)
> +		return ret;
> +
> +	return be16_to_cpu(data);
> +}
> +
> +static int vl6180_write_byte(struct i2c_client *client, u16 cmd, u8 val)
> +{
> +	u8 buf[3];
> +	struct i2c_msg msgs[1] = {
> +		{ .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
> +	int ret;
> +
> +	buf[0] = cmd >> 8;
> +	buf[1] = cmd & 0xff;
> +	buf[2] = val;
> +
> +	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vl6180_write_word(struct i2c_client *client, u16 cmd, u16 val)
> +{
> +	__be16 buf[2];
> +	struct i2c_msg msgs[1] = {
> +		{ .addr = client->addr, .len = sizeof(buf), .buf = (u8 *) &buf } };
> +	int ret;
> +
> +	buf[0] = cpu_to_be16(cmd);
> +	buf[1] = cpu_to_be16(val);
> +
> +	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
> +	if (ret < 0) {
> +		dev_err(&client->dev, "failed writing register 0x%04x\n", cmd);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vl6180_measure(struct vl6180_data *data, int addr)
> +{
> +	struct i2c_client *client = data->client;
> +	int tries = 20, ret;
> +	u16 value;
> +
> +	mutex_lock(&data->lock);
> +	/* Start single shot measurement */
> +	ret = vl6180_write_byte(client,
> +		vl6180_chan_regs_table[addr].start_reg, VL6180_STARTSTOP);
> +	if (ret < 0)
> +		goto fail;
> +
> +	while (tries--) {
> +		ret = vl6180_read_byte(client, VL6180_INTR_STATUS);
> +		if (ret < 0)
> +			goto fail;
> +
> +		if (ret & vl6180_chan_regs_table[addr].drdy_mask)
> +			break;
> +		msleep(20);
> +	}
> +
> +	if (tries < 0) {
> +		ret = -EIO;
> +		goto fail;
> +	}
> +
> +	/* Read result value from appropriate registers */
> +	ret = vl6180_chan_regs_table[addr].word ?
> +		vl6180_read_word(client, vl6180_chan_regs_table[addr].value_reg) :
> +		vl6180_read_byte(client, vl6180_chan_regs_table[addr].value_reg);
> +	if (ret < 0)
> +		goto fail;
> +	value = ret;
> +
> +	/* Clear the interrupt flag after data read */
> +	ret = vl6180_write_byte(client, VL6180_INTR_CLEAR,
> +		VL6180_CLEAR_ERROR | VL6180_CLEAR_ALS | VL6180_CLEAR_RANGE);
> +	if (ret < 0)
> +		goto fail;
> +
> +	ret = value;
> +
> +fail:
> +	mutex_unlock(&data->lock);
> +
> +	return ret;
> +}
> +
> +static const struct iio_chan_spec vl6180_channels[] = {
> +	{
> +		.type = IIO_LIGHT,
> +		.address = VL6180_ALS,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_INT_TIME) |
> +			BIT(IIO_CHAN_INFO_SCALE) |
> +			BIT(IIO_CHAN_INFO_HARDWAREGAIN),
> +	}, {
> +		.type = IIO_DISTANCE,
> +		.address = VL6180_RANGE,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> +			BIT(IIO_CHAN_INFO_SCALE),
> +	}, {
> +		.type = IIO_PROXIMITY,
> +		.address = VL6180_PROX,
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> +	}
> +};
> +
> +/* Columns 3 & 4 represent the same value in decimal and hex notations.
> + * Kept in order to avoid the datatype conversion while reading the
> + * hardware_gain */
> +static const int vl6180_als_gain[8][4] = {
> +	{ 1,	0,	70,	VL6180_ALS_GAIN_1 },
> +	{ 1,    250000, 69,	VL6180_ALS_GAIN_1_25 },
> +	{ 1,    670000, 68,	VL6180_ALS_GAIN_1_67 },
> +	{ 2,    500000, 67,	VL6180_ALS_GAIN_2_5 },
> +	{ 5,    0,      66,	VL6180_ALS_GAIN_5 },
> +	{ 10,   0,      65,	VL6180_ALS_GAIN_10 },
> +	{ 20,   0,      64,	VL6180_ALS_GAIN_20 },
> +	{ 40,   0,      71,	VL6180_ALS_GAIN_40 }
> +};
> +
> +static int vl6180_read_raw(struct iio_dev *indio_dev,
> +				struct iio_chan_spec const *chan,
> +				int *val, int *val2, long mask)
> +{
> +	struct vl6180_data *data = iio_priv(indio_dev);
> +	int ret, i;
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:
> +		ret = vl6180_measure(data, chan->address);
> +		if (ret < 0)
> +			return ret;
> +		*val = ret;
> +
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_INT_TIME:
> +		ret = vl6180_read_word(data->client, VL6180_ALS_IT);
> +		if (ret < 0)
> +			return ret;
> +		*val = 0; /* 1 count = 1ms (0 = 1ms) */
> +		*val2 = (ret + 1) * 1000; /* convert to seconds */
> +
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	case IIO_CHAN_INFO_SCALE:
> +		switch (chan->type) {
> +		case IIO_LIGHT:
> +			*val = 0; /* one ALS count is 0.32 Lux */
> +			*val2 = 320000;
> +			break;
> +		case IIO_DISTANCE:
> +			*val = 0; /* sensor reports mm, scale to meter */
> +			*val2 = 1000;
> +			break;
> +		default:
> +			return -EINVAL;
> +		}
> +
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	case IIO_CHAN_INFO_HARDWAREGAIN:
> +		ret = vl6180_read_byte(data->client, VL6180_ALS_GAIN);
> +		if (ret < 0)
> +			return -EINVAL;
> +		for (i = 0; i < ARRAY_SIZE(vl6180_als_gain); i++) {
> +			if (ret == vl6180_als_gain[i][2]) {
> +				*val = vl6180_als_gain[i][0];
> +				*val2 = vl6180_als_gain[i][1];
> +			}
> +		}
> +
> +		return IIO_VAL_INT_PLUS_MICRO;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static IIO_CONST_ATTR(als_gain_available, "1 1.25 1.67 2.5 5 10 20 40");
> +
> +static struct attribute *vl6180_attributes[] = {
> +	&iio_const_attr_als_gain_available.dev_attr.attr,
> +	NULL
> +};
> +
> +static const struct attribute_group vl6180_attribute_group = {
> +	.attrs = vl6180_attributes,
> +};
> +
> +/* HOLD is needed before updating any config registers */
> +static int vl6180_hold(struct vl6180_data *data, bool hold)
> +{
> +	return vl6180_write_byte(data->client, VL6180_HOLD,
> +		hold ? VL6180_HOLD_ON : 0);
> +}
> +
> +static int vl6180_set_als_gain(struct vl6180_data *data, int val, int val2)
> +{
> +	int i, ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(vl6180_als_gain); i++) {
> +		if (val == vl6180_als_gain[i][0] &&
> +			val2 == vl6180_als_gain[i][1]) {
> +			mutex_lock(&data->lock);
> +			ret = vl6180_hold(data, true);
> +			if (ret < 0)
> +				goto fail;
> +			ret = vl6180_write_byte(data->client, VL6180_ALS_GAIN,
> +				vl6180_als_gain[i][3]);
> +fail:
> +			vl6180_hold(data, false);
> +			mutex_unlock(&data->lock);
> +			return ret;
> +		}
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int vl6180_set_it(struct vl6180_data *data, int val2)
> +{
> +	int ret;
> +
> +	mutex_lock(&data->lock);
> +	ret = vl6180_hold(data, true);
> +	if (ret < 0)
> +		goto fail;
> +	ret = vl6180_write_word(data->client, VL6180_ALS_IT,
> +		(val2 - 500) / 1000); /* write value in ms */
> +fail:
> +	vl6180_hold(data, false);
> +	mutex_unlock(&data->lock);
> +
> +	return ret;
> +}
> +
> +static int vl6180_write_raw(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     int val, int val2, long mask)
> +{
> +	struct vl6180_data *data = iio_priv(indio_dev);
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_INT_TIME:
> +		if (val != 0 || val2 < 500 || val2 >= 512500)
> +			return -EINVAL;
> +
> +		return vl6180_set_it(data, val2);
> +	case IIO_CHAN_INFO_HARDWAREGAIN:
> +		if (chan->type != IIO_LIGHT)
> +			return -EINVAL;
> +
> +		return vl6180_set_als_gain(data, val, val2);
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const struct iio_info vl6180_info = {
> +	.read_raw = vl6180_read_raw,
> +	.write_raw = vl6180_write_raw,
> +	.attrs = &vl6180_attribute_group,
> +	.driver_module = THIS_MODULE,
> +};
> +
> +static int vl6180_init(struct vl6180_data *data)
> +{
> +	struct i2c_client *client = data->client;
> +	int ret;
> +
> +	ret = vl6180_read_byte(client, VL6180_MODEL_ID);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (ret != VL6180_MODEL_ID_VAL) {
> +		dev_err(&client->dev, "invalid model ID %02x\n", ret);
> +		return -ENODEV;
> +	}
> +
> +	ret = vl6180_hold(data, true);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = vl6180_read_byte(client, VL6180_OUT_OF_RESET);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Detect false reset condition here. This bit is always set when the system comes
> +	 * out of reset */
> +	if (ret != 0x01)
> +		dev_info(&client->dev, "device is not fresh out of reset\n");
> +
> +	/* Enable ALS and Range ready interrupts */
> +	ret = vl6180_write_byte(client, VL6180_INTR_CONFIG,
> +				VL6180_ALS_READY | VL6180_RANGE_READY);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* ALS integration time: 100ms */
> +	ret = vl6180_write_word(client, VL6180_ALS_IT, VL6180_ALS_IT_100);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* ALS gain: 1 */
> +	ret = vl6180_write_byte(client, VL6180_ALS_GAIN, VL6180_ALS_GAIN_1);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = vl6180_write_byte(client, VL6180_OUT_OF_RESET, 0x00);
> +	if (ret < 0)
> +		return ret;
> +
> +	return vl6180_hold(data, false);
> +}
> +
> +static int vl6180_probe(struct i2c_client *client,
> +			  const struct i2c_device_id *id)
> +{
> +	struct vl6180_data *data;
> +	struct iio_dev *indio_dev;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	data = iio_priv(indio_dev);
> +	i2c_set_clientdata(client, indio_dev);
> +	data->client = client;
> +	mutex_init(&data->lock);
> +
> +	indio_dev->dev.parent = &client->dev;
> +	indio_dev->info = &vl6180_info;
> +	indio_dev->channels = vl6180_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(vl6180_channels);
> +	indio_dev->name = VL6180_DRV_NAME;
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +
> +	ret = vl6180_init(data);
> +	if (ret < 0)
> +		return ret;
> +
> +	return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +
> +static const struct of_device_id vl6180_of_match[] = {
> +	{ .compatible = "st,vl6180", },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, vl6180_of_match);
> +
> +static const struct i2c_device_id vl6180_id[] = {
> +	{ "vl6180", 0 },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(i2c, vl6180_id);
> +
> +static struct i2c_driver vl6180_driver = {
> +	.driver = {
> +		.name   = VL6180_DRV_NAME,
> +		.of_match_table = of_match_ptr(vl6180_of_match),
> +	},
> +	.probe  = vl6180_probe,
> +	.id_table = vl6180_id,
> +};
> +
> +module_i2c_driver(vl6180_driver);
> +
> +MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw-jW+XmwGofnusTnJN9+BGXg@public.gmane.org>");
> +MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>");
> +MODULE_DESCRIPTION("STMicro VL6180 ALS, range and proximity sensor driver");
> +MODULE_LICENSE("GPL");
> 

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