// SPDX-License-Identifier: GPL-2.0-only /* * MAX44000 Ambient and Infrared Proximity Sensor * * Copyright (c) 2016, Intel Corporation. * * Data sheet: https://datasheets.maximintegrated.com/en/ds/MAX44000.pdf * * 7-bit I2C slave address 0x4a */ #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/regmap.h> #include <linux/util_macros.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger_consumer.h> #include <linux/iio/triggered_buffer.h> #define MAX44000_DRV_NAME … /* Registers in datasheet order */ #define MAX44000_REG_STATUS … #define MAX44000_REG_CFG_MAIN … #define MAX44000_REG_CFG_RX … #define MAX44000_REG_CFG_TX … #define MAX44000_REG_ALS_DATA_HI … #define MAX44000_REG_ALS_DATA_LO … #define MAX44000_REG_PRX_DATA … #define MAX44000_REG_ALS_UPTHR_HI … #define MAX44000_REG_ALS_UPTHR_LO … #define MAX44000_REG_ALS_LOTHR_HI … #define MAX44000_REG_ALS_LOTHR_LO … #define MAX44000_REG_PST … #define MAX44000_REG_PRX_IND … #define MAX44000_REG_PRX_THR … #define MAX44000_REG_TRIM_GAIN_GREEN … #define MAX44000_REG_TRIM_GAIN_IR … /* REG_CFG bits */ #define MAX44000_CFG_ALSINTE … #define MAX44000_CFG_PRXINTE … #define MAX44000_CFG_MASK … #define MAX44000_CFG_MODE_SHUTDOWN … #define MAX44000_CFG_MODE_ALS_GIR … #define MAX44000_CFG_MODE_ALS_G … #define MAX44000_CFG_MODE_ALS_IR … #define MAX44000_CFG_MODE_ALS_PRX … #define MAX44000_CFG_MODE_PRX … #define MAX44000_CFG_TRIM … /* * Upper 4 bits are not documented but start as 1 on powerup * Setting them to 0 causes proximity to misbehave so set them to 1 */ #define MAX44000_REG_CFG_RX_DEFAULT … /* REG_RX bits */ #define MAX44000_CFG_RX_ALSTIM_MASK … #define MAX44000_CFG_RX_ALSTIM_SHIFT … #define MAX44000_CFG_RX_ALSPGA_MASK … #define MAX44000_CFG_RX_ALSPGA_SHIFT … /* REG_TX bits */ #define MAX44000_LED_CURRENT_MASK … #define MAX44000_LED_CURRENT_MAX … #define MAX44000_LED_CURRENT_DEFAULT … #define MAX44000_ALSDATA_OVERFLOW … struct max44000_data { … }; /* Default scale is set to the minimum of 0.03125 or 1 / (1 << 5) lux */ #define MAX44000_ALS_TO_LUX_DEFAULT_FRACTION_LOG2 … /* Scale can be multiplied by up to 128x via ALSPGA for measurement gain */ static const int max44000_alspga_shift[] = …; #define MAX44000_ALSPGA_MAX_SHIFT … /* * Scale can be multiplied by up to 64x via ALSTIM because of lost resolution * * This scaling factor is hidden from userspace and instead accounted for when * reading raw values from the device. * * This makes it possible to cleanly expose ALSPGA as IIO_CHAN_INFO_SCALE and * ALSTIM as IIO_CHAN_INFO_INT_TIME without the values affecting each other. * * Handling this internally is also required for buffer support because the * channel's scan_type can't be modified dynamically. */ #define MAX44000_ALSTIM_SHIFT(alstim) … /* Available integration times with pretty manual alignment: */ static const int max44000_int_time_avail_ns_array[] = …; static const char max44000_int_time_avail_str[] = …; /* Available scales (internal to ulux) with pretty manual alignment: */ static const int max44000_scale_avail_ulux_array[] = …; static const char max44000_scale_avail_str[] = …; #define MAX44000_SCAN_INDEX_ALS … #define MAX44000_SCAN_INDEX_PRX … static const struct iio_chan_spec max44000_channels[] = …; static int max44000_read_alstim(struct max44000_data *data) { … } static int max44000_write_alstim(struct max44000_data *data, int val) { … } static int max44000_read_alspga(struct max44000_data *data) { … } static int max44000_write_alspga(struct max44000_data *data, int val) { … } static int max44000_read_alsval(struct max44000_data *data) { … } static int max44000_write_led_current_raw(struct max44000_data *data, int val) { … } static int max44000_read_led_current_raw(struct max44000_data *data) { … } static int max44000_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int max44000_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int max44000_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, long mask) { … } static IIO_CONST_ATTR(illuminance_integration_time_available, max44000_int_time_avail_str); static IIO_CONST_ATTR(illuminance_scale_available, max44000_scale_avail_str); static struct attribute *max44000_attributes[] = …; static const struct attribute_group max44000_attribute_group = …; static const struct iio_info max44000_info = …; static bool max44000_readable_reg(struct device *dev, unsigned int reg) { … } static bool max44000_writeable_reg(struct device *dev, unsigned int reg) { … } static bool max44000_volatile_reg(struct device *dev, unsigned int reg) { … } static bool max44000_precious_reg(struct device *dev, unsigned int reg) { … } static const struct regmap_config max44000_regmap_config = …; static irqreturn_t max44000_trigger_handler(int irq, void *p) { … } static int max44000_probe(struct i2c_client *client) { … } static const struct i2c_device_id max44000_id[] = …; MODULE_DEVICE_TABLE(i2c, max44000_id); static const struct acpi_device_id max44000_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, max44000_acpi_match); static struct i2c_driver max44000_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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