From: Arthur Becker <arthur.becker@xxxxxxxxxx> Implements driver for the Vishay VEML6040 rgbw light sensor. Included functionality: setting the integration time and reading the raw values for the four channels Not yet implemented: setting the measurements to 'Manual Force Mode' (Auto measurements off, and adding a measurement trigger) Datasheet: https://www.vishay.com/docs/84276/veml6040.pdf Signed-off-by: Arthur Becker <arthur.becker@xxxxxxxxxx> --- V1 -> V2: Addressed review comments. V2 -> V3: Addressed further review comments; Sending in patch thread with dt-bindings. V3 -> V4: Minor adjustments --- drivers/iio/light/Kconfig | 11 ++ drivers/iio/light/Makefile | 1 + drivers/iio/light/veml6040.c | 281 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 293 insertions(+) diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 9a587d403118..b68dcc1fbaca 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -666,6 +666,17 @@ config VEML6030 To compile this driver as a module, choose M here: the module will be called veml6030. +config VEML6040 + tristate "VEML6040 RGBW light sensor" + select REGMAP_I2C + depends on I2C + help + Say Y here if you want to build a driver for the Vishay VEML6040 + RGBW light sensor. + + To compile this driver as a module, choose M here: the + module will be called veml6040. + config VEML6070 tristate "VEML6070 UV A light sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index a30f906e91ba..1a071a8e9f8e 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -62,6 +62,7 @@ obj-$(CONFIG_US5182D) += us5182d.o obj-$(CONFIG_VCNL4000) += vcnl4000.o obj-$(CONFIG_VCNL4035) += vcnl4035.o obj-$(CONFIG_VEML6030) += veml6030.o +obj-$(CONFIG_VEML6040) += veml6040.o obj-$(CONFIG_VEML6070) += veml6070.o obj-$(CONFIG_VEML6075) += veml6075.o obj-$(CONFIG_VL6180) += vl6180.o diff --git a/drivers/iio/light/veml6040.c b/drivers/iio/light/veml6040.c new file mode 100644 index 000000000000..216e271001a8 --- /dev/null +++ b/drivers/iio/light/veml6040.c @@ -0,0 +1,281 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Vishay VEML6040 RGBW light sensor driver + * + * Copyright (C) 2024 Sentec AG + * Author: Arthur Becker <arthur.becker@xxxxxxxxxx> + * + */ + +#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@xxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.34.1
