// SPDX-License-Identifier: GPL-2.0-or-later /* * IIO driver for Lite-On LTR390 ALS and UV sensor * (7-bit I2C slave address 0x53) * * Based on the work of: * Shreeya Patel and Shi Zhigang (LTRF216 Driver) * * Copyright (C) 2023 Anshul Dalal <[email protected]> * * Datasheet: * https://optoelectronics.liteon.com/upload/download/DS86-2015-0004/LTR-390UV_Final_%20DS_V1%201.pdf * * TODO: * - Support for configurable gain and resolution * - Sensor suspend/resume support * - Add support for reading the ALS * - Interrupt support */ #include <linux/i2c.h> #include <linux/math.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/regmap.h> #include <linux/bitfield.h> #include <linux/iio/iio.h> #include <linux/unaligned.h> #define LTR390_MAIN_CTRL … #define LTR390_ALS_UVS_MEAS_RATE … #define LTR390_ALS_UVS_GAIN … #define LTR390_PART_ID … #define LTR390_ALS_DATA … #define LTR390_UVS_DATA … #define LTR390_INT_CFG … #define LTR390_PART_NUMBER_ID … #define LTR390_ALS_UVS_GAIN_MASK … #define LTR390_ALS_UVS_INT_TIME_MASK … #define LTR390_ALS_UVS_INT_TIME(x) … #define LTR390_SW_RESET … #define LTR390_UVS_MODE … #define LTR390_SENSOR_ENABLE … #define LTR390_FRACTIONAL_PRECISION … /* * At 20-bit resolution (integration time: 400ms) and 18x gain, 2300 counts of * the sensor are equal to 1 UV Index [Datasheet Page#8]. * * For the default resolution of 18-bit (integration time: 100ms) and default * gain of 3x, the counts/uvi are calculated as follows: * 2300 / ((3/18) * (100/400)) = 95.83 */ #define LTR390_COUNTS_PER_UVI … /* * Window Factor is needed when the device is under Window glass with coated * tinted ink. This is to compensate for the light loss due to the lower * transmission rate of the window glass and helps * in calculating lux. */ #define LTR390_WINDOW_FACTOR … enum ltr390_mode { … }; struct ltr390_data { … }; static const struct regmap_config ltr390_regmap_config = …; static int ltr390_register_read(struct ltr390_data *data, u8 register_address) { … } static int ltr390_set_mode(struct ltr390_data *data, enum ltr390_mode mode) { … } static int ltr390_counts_per_uvi(struct ltr390_data *data) { … } static int ltr390_read_raw(struct iio_dev *iio_device, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } /* integration time in us */ static const int ltr390_int_time_map_us[] = …; static const int ltr390_gain_map[] = …; static const struct iio_chan_spec ltr390_channels[] = …; static int ltr390_set_gain(struct ltr390_data *data, int val) { … } static int ltr390_set_int_time(struct ltr390_data *data, int val) { … } static int ltr390_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { … } static int ltr390_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static const struct iio_info ltr390_info = …; static int ltr390_probe(struct i2c_client *client) { … } static const struct i2c_device_id ltr390_id[] = …; MODULE_DEVICE_TABLE(i2c, ltr390_id); static const struct of_device_id ltr390_of_table[] = …; MODULE_DEVICE_TABLE(of, ltr390_of_table); static struct i2c_driver ltr390_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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