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iio: light: driver for Vishay VEML6040
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@sentec.com> Link: https://lore.kernel.org/r/20240604-veml6040-v4-1-5a4d59597874@sentec.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Arthur Becker
Jonathan Cameron
parent
5cf99438d5
commit
3c34171c1b
@ -666,6 +666,17 @@ config VEML6030
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To compile this driver as a module, choose M here: the
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module will be called veml6030.
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config VEML6040
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tristate "VEML6040 RGBW light sensor"
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select REGMAP_I2C
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depends on I2C
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help
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Say Y here if you want to build a driver for the Vishay VEML6040
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RGBW light sensor.
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To compile this driver as a module, choose M here: the
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module will be called veml6040.
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config VEML6070
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tristate "VEML6070 UV A light sensor"
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depends on I2C
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@ -62,6 +62,7 @@ obj-$(CONFIG_US5182D) += us5182d.o
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obj-$(CONFIG_VCNL4000) += vcnl4000.o
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obj-$(CONFIG_VCNL4035) += vcnl4035.o
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obj-$(CONFIG_VEML6030) += veml6030.o
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obj-$(CONFIG_VEML6040) += veml6040.o
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obj-$(CONFIG_VEML6070) += veml6070.o
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obj-$(CONFIG_VEML6075) += veml6075.o
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obj-$(CONFIG_VL6180) += vl6180.o
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281
drivers/iio/light/veml6040.c
Normal file
281
drivers/iio/light/veml6040.c
Normal file
@ -0,0 +1,281 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Vishay VEML6040 RGBW light sensor driver
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*
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* Copyright (C) 2024 Sentec AG
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* Author: Arthur Becker <arthur.becker@sentec.com>
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*
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*/
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#include <linux/bitfield.h>
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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/* VEML6040 Configuration Registers
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*
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* SD: Shutdown
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* AF: Auto / Force Mode (Auto Measurements On:0, Off:1)
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* TR: Trigger Measurement (when AF Bit is set)
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* IT: Integration Time
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*/
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#define VEML6040_CONF_REG 0x000
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#define VEML6040_CONF_SD_MSK BIT(0)
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#define VEML6040_CONF_AF_MSK BIT(1)
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#define VEML6040_CONF_TR_MSK BIT(2)
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#define VEML6040_CONF_IT_MSK GENMASK(6, 4)
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#define VEML6040_CONF_IT_40_MS 0
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#define VEML6040_CONF_IT_80_MS 1
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#define VEML6040_CONF_IT_160_MS 2
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#define VEML6040_CONF_IT_320_MS 3
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#define VEML6040_CONF_IT_640_MS 4
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#define VEML6040_CONF_IT_1280_MS 5
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/* VEML6040 Read Only Registers */
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#define VEML6040_REG_R 0x08
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#define VEML6040_REG_G 0x09
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#define VEML6040_REG_B 0x0A
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#define VEML6040_REG_W 0x0B
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static const int veml6040_it_ms[] = { 40, 80, 160, 320, 640, 1280 };
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enum veml6040_chan {
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CH_RED,
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CH_GREEN,
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CH_BLUE,
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CH_WHITE,
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};
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struct veml6040_data {
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struct i2c_client *client;
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struct regmap *regmap;
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};
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static const struct regmap_config veml6040_regmap_config = {
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.name = "veml6040_regmap",
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.reg_bits = 8,
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.val_bits = 16,
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.max_register = VEML6040_REG_W,
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.val_format_endian = REGMAP_ENDIAN_LITTLE,
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};
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static int veml6040_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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int ret, reg, it_index;
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struct veml6040_data *data = iio_priv(indio_dev);
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struct regmap *regmap = data->regmap;
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struct device *dev = &data->client->dev;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = regmap_read(regmap, chan->address, ®);
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if (ret) {
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dev_err(dev, "Data read failed: %d\n", ret);
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return ret;
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}
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*val = reg;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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ret = regmap_read(regmap, VEML6040_CONF_REG, ®);
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if (ret) {
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dev_err(dev, "Data read failed: %d\n", ret);
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return ret;
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}
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it_index = FIELD_GET(VEML6040_CONF_IT_MSK, reg);
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if (it_index >= ARRAY_SIZE(veml6040_it_ms)) {
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dev_err(dev, "Invalid Integration Time Set");
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return -EINVAL;
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}
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*val = veml6040_it_ms[it_index];
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static int veml6040_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int val,
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int val2, long mask)
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{
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struct veml6040_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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for (int i = 0; i < ARRAY_SIZE(veml6040_it_ms); i++) {
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if (veml6040_it_ms[i] != val)
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continue;
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return regmap_update_bits(data->regmap,
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VEML6040_CONF_REG,
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VEML6040_CONF_IT_MSK,
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FIELD_PREP(VEML6040_CONF_IT_MSK, i));
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}
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return -EINVAL;
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default:
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return -EINVAL;
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}
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}
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static int veml6040_read_avail(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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const int **vals, int *type, int *length,
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long mask)
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{
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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*length = ARRAY_SIZE(veml6040_it_ms);
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*vals = veml6040_it_ms;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_LIST;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info veml6040_info = {
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.read_raw = veml6040_read_raw,
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.write_raw = veml6040_write_raw,
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.read_avail = veml6040_read_avail,
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};
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static const struct iio_chan_spec veml6040_channels[] = {
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{
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.type = IIO_INTENSITY,
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.address = VEML6040_REG_R,
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.channel = CH_RED,
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.channel2 = IIO_MOD_LIGHT_RED,
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.modified = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
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.info_mask_shared_by_type_available =
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BIT(IIO_CHAN_INFO_INT_TIME),
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},
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{
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.type = IIO_INTENSITY,
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.address = VEML6040_REG_G,
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.channel = CH_GREEN,
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.channel2 = IIO_MOD_LIGHT_GREEN,
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.modified = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
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.info_mask_shared_by_type_available =
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BIT(IIO_CHAN_INFO_INT_TIME),
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},
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{
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.type = IIO_INTENSITY,
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.address = VEML6040_REG_B,
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.channel = CH_BLUE,
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.channel2 = IIO_MOD_LIGHT_BLUE,
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.modified = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
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.info_mask_shared_by_type_available =
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BIT(IIO_CHAN_INFO_INT_TIME),
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},
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{
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.type = IIO_INTENSITY,
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.address = VEML6040_REG_W,
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.channel = CH_WHITE,
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.channel2 = IIO_MOD_LIGHT_CLEAR,
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.modified = 1,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
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.info_mask_shared_by_type_available =
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BIT(IIO_CHAN_INFO_INT_TIME),
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}
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};
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static void veml6040_shutdown_action(void *data)
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{
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struct veml6040_data *veml6040_data = data;
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regmap_update_bits(veml6040_data->regmap, VEML6040_CONF_REG,
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VEML6040_CONF_SD_MSK, VEML6040_CONF_SD_MSK);
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}
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static int veml6040_probe(struct i2c_client *client)
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{
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struct device *dev = &client->dev;
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struct veml6040_data *data;
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struct iio_dev *indio_dev;
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struct regmap *regmap;
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const int init_config =
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FIELD_PREP(VEML6040_CONF_IT_MSK, VEML6040_CONF_IT_40_MS) |
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FIELD_PREP(VEML6040_CONF_AF_MSK, 0) |
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FIELD_PREP(VEML6040_CONF_SD_MSK, 0);
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int ret;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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return dev_err_probe(dev, -EOPNOTSUPP,
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"I2C adapter doesn't support plain I2C\n");
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indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
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if (!indio_dev)
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return dev_err_probe(dev, -ENOMEM,
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"IIO device allocation failed\n");
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regmap = devm_regmap_init_i2c(client, &veml6040_regmap_config);
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if (IS_ERR(regmap))
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return dev_err_probe(dev, PTR_ERR(regmap),
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"Regmap setup failed\n");
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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data->regmap = regmap;
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indio_dev->name = "veml6040";
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indio_dev->info = &veml6040_info;
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indio_dev->channels = veml6040_channels;
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indio_dev->num_channels = ARRAY_SIZE(veml6040_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = devm_regulator_get_enable(dev, "vdd");
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if (ret)
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return ret;
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ret = regmap_write(regmap, VEML6040_CONF_REG, init_config);
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if (ret)
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return dev_err_probe(dev, ret,
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"Could not set initial config\n");
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ret = devm_add_action_or_reset(dev, veml6040_shutdown_action, data);
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if (ret)
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return ret;
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return devm_iio_device_register(dev, indio_dev);
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}
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static const struct i2c_device_id veml6040_id_table[] = {
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{"veml6040"},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, veml6040_id_table);
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static const struct of_device_id veml6040_of_match[] = {
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{.compatible = "vishay,veml6040"},
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{}
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};
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MODULE_DEVICE_TABLE(of, veml6040_of_match);
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static struct i2c_driver veml6040_driver = {
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.probe = veml6040_probe,
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.id_table = veml6040_id_table,
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.driver = {
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.name = "veml6040",
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.of_match_table = veml6040_of_match,
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},
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};
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module_i2c_driver(veml6040_driver);
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MODULE_DESCRIPTION("veml6040 RGBW light sensor driver");
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MODULE_AUTHOR("Arthur Becker <arthur.becker@sentec.com>");
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MODULE_LICENSE("GPL");
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