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// SPDX-License-Identifier: GPL-2.0+
/*
* Vishay VEML6040 RGBW light sensor driver
*
* Copyright (C) 2024 Sentec AG
* Author: Arthur Becker <arthur.becker@sentec.com>
*
*/
#include <linux/bitfield.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/module.h>
#include <linux/regmap.h>
/* VEML6040 Configuration Registers
*
* SD: Shutdown
* AF: Auto / Force Mode (Auto Measurements On:0, Off:1)
* TR: Trigger Measurement (when AF Bit is set)
* IT: Integration Time
*/
#define VEML6040_CONF_REG 0x000
#define VEML6040_CONF_SD_MSK BIT(0)
#define VEML6040_CONF_AF_MSK BIT(1)
#define VEML6040_CONF_TR_MSK BIT(2)
#define VEML6040_CONF_IT_MSK GENMASK(6, 4)
#define VEML6040_CONF_IT_40_MS 0
#define VEML6040_CONF_IT_80_MS 1
#define VEML6040_CONF_IT_160_MS 2
#define VEML6040_CONF_IT_320_MS 3
#define VEML6040_CONF_IT_640_MS 4
#define VEML6040_CONF_IT_1280_MS 5
/* VEML6040 Read Only Registers */
#define VEML6040_REG_R 0x08
#define VEML6040_REG_G 0x09
#define VEML6040_REG_B 0x0A
#define VEML6040_REG_W 0x0B
static const int veml6040_it_ms[] = { 40, 80, 160, 320, 640, 1280 };
enum veml6040_chan {
CH_RED,
CH_GREEN,
CH_BLUE,
CH_WHITE,
};
struct veml6040_data {
struct i2c_client *client;
struct regmap *regmap;
};
static const struct regmap_config veml6040_regmap_config = {
.name = "veml6040_regmap",
.reg_bits = 8,
.val_bits = 16,
.max_register = VEML6040_REG_W,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
static int veml6040_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
int ret, reg, it_index;
struct veml6040_data *data = iio_priv(indio_dev);
struct regmap *regmap = data->regmap;
struct device *dev = &data->client->dev;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = regmap_read(regmap, chan->address, ®);
if (ret) {
dev_err(dev, "Data read failed: %d\n", ret);
return ret;
}
*val = reg;
return IIO_VAL_INT;
case IIO_CHAN_INFO_INT_TIME:
ret = regmap_read(regmap, VEML6040_CONF_REG, ®);
if (ret) {
dev_err(dev, "Data read failed: %d\n", ret);
return ret;
}
it_index = FIELD_GET(VEML6040_CONF_IT_MSK, reg);
if (it_index >= ARRAY_SIZE(veml6040_it_ms)) {
dev_err(dev, "Invalid Integration Time Set");
return -EINVAL;
}
*val = veml6040_it_ms[it_index];
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int veml6040_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct veml6040_data *data = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
for (int i = 0; i < ARRAY_SIZE(veml6040_it_ms); i++) {
if (veml6040_it_ms[i] != val)
continue;
return regmap_update_bits(data->regmap,
VEML6040_CONF_REG,
VEML6040_CONF_IT_MSK,
FIELD_PREP(VEML6040_CONF_IT_MSK, i));
}
return -EINVAL;
default:
return -EINVAL;
}
}
static int veml6040_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
switch (mask) {
case IIO_CHAN_INFO_INT_TIME:
*length = ARRAY_SIZE(veml6040_it_ms);
*vals = veml6040_it_ms;
*type = IIO_VAL_INT;
return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
}
static const struct iio_info veml6040_info = {
.read_raw = veml6040_read_raw,
.write_raw = veml6040_write_raw,
.read_avail = veml6040_read_avail,
};
static const struct iio_chan_spec veml6040_channels[] = {
{
.type = IIO_INTENSITY,
.address = VEML6040_REG_R,
.channel = CH_RED,
.channel2 = IIO_MOD_LIGHT_RED,
.modified = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_shared_by_type_available =
BIT(IIO_CHAN_INFO_INT_TIME),
},
{
.type = IIO_INTENSITY,
.address = VEML6040_REG_G,
.channel = CH_GREEN,
.channel2 = IIO_MOD_LIGHT_GREEN,
.modified = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_shared_by_type_available =
BIT(IIO_CHAN_INFO_INT_TIME),
},
{
.type = IIO_INTENSITY,
.address = VEML6040_REG_B,
.channel = CH_BLUE,
.channel2 = IIO_MOD_LIGHT_BLUE,
.modified = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_shared_by_type_available =
BIT(IIO_CHAN_INFO_INT_TIME),
},
{
.type = IIO_INTENSITY,
.address = VEML6040_REG_W,
.channel = CH_WHITE,
.channel2 = IIO_MOD_LIGHT_CLEAR,
.modified = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_shared_by_type_available =
BIT(IIO_CHAN_INFO_INT_TIME),
}
};
static void veml6040_shutdown_action(void *data)
{
struct veml6040_data *veml6040_data = data;
regmap_update_bits(veml6040_data->regmap, VEML6040_CONF_REG,
VEML6040_CONF_SD_MSK, VEML6040_CONF_SD_MSK);
}
static int veml6040_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct veml6040_data *data;
struct iio_dev *indio_dev;
struct regmap *regmap;
const int init_config =
FIELD_PREP(VEML6040_CONF_IT_MSK, VEML6040_CONF_IT_40_MS) |
FIELD_PREP(VEML6040_CONF_AF_MSK, 0) |
FIELD_PREP(VEML6040_CONF_SD_MSK, 0);
int ret;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return dev_err_probe(dev, -EOPNOTSUPP,
"I2C adapter doesn't support plain I2C\n");
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return dev_err_probe(dev, -ENOMEM,
"IIO device allocation failed\n");
regmap = devm_regmap_init_i2c(client, &veml6040_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Regmap setup failed\n");
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
data->regmap = regmap;
indio_dev->name = "veml6040";
indio_dev->info = &veml6040_info;
indio_dev->channels = veml6040_channels;
indio_dev->num_channels = ARRAY_SIZE(veml6040_channels);
indio_dev->modes = INDIO_DIRECT_MODE;
ret = devm_regulator_get_enable(dev, "vdd");
if (ret)
return ret;
ret = regmap_write(regmap, VEML6040_CONF_REG, init_config);
if (ret)
return dev_err_probe(dev, ret,
"Could not set initial config\n");
ret = devm_add_action_or_reset(dev, veml6040_shutdown_action, data);
if (ret)
return ret;
return devm_iio_device_register(dev, indio_dev);
}
static const struct i2c_device_id veml6040_id_table[] = {
{"veml6040"},
{}
};
MODULE_DEVICE_TABLE(i2c, veml6040_id_table);
static const struct of_device_id veml6040_of_match[] = {
{.compatible = "vishay,veml6040"},
{}
};
MODULE_DEVICE_TABLE(of, veml6040_of_match);
static struct i2c_driver veml6040_driver = {
.probe = veml6040_probe,
.id_table = veml6040_id_table,
.driver = {
.name = "veml6040",
.of_match_table = veml6040_of_match,
},
};
module_i2c_driver(veml6040_driver);
MODULE_DESCRIPTION("veml6040 RGBW light sensor driver");
MODULE_AUTHOR("Arthur Becker <arthur.becker@sentec.com>");
MODULE_LICENSE("GPL");
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