// SPDX-License-Identifier: GPL-2.0+ /* * VEML6030 Ambient Light Sensor * * Copyright (c) 2019, Rishi Gupta <[email protected]> * * Datasheet: https://www.vishay.com/docs/84366/veml6030.pdf * Appnote-84367: https://www.vishay.com/docs/84367/designingveml6030.pdf */ #include <linux/module.h> #include <linux/i2c.h> #include <linux/err.h> #include <linux/regmap.h> #include <linux/interrupt.h> #include <linux/pm_runtime.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/events.h> /* Device registers */ #define VEML6030_REG_ALS_CONF … #define VEML6030_REG_ALS_WH … #define VEML6030_REG_ALS_WL … #define VEML6030_REG_ALS_PSM … #define VEML6030_REG_ALS_DATA … #define VEML6030_REG_WH_DATA … #define VEML6030_REG_ALS_INT … /* Bit masks for specific functionality */ #define VEML6030_ALS_IT … #define VEML6030_PSM … #define VEML6030_ALS_PERS … #define VEML6030_ALS_GAIN … #define VEML6030_PSM_EN … #define VEML6030_INT_TH_LOW … #define VEML6030_INT_TH_HIGH … #define VEML6030_ALS_INT_EN … #define VEML6030_ALS_SD … /* * The resolution depends on both gain and integration time. The * cur_resolution stores one of the resolution mentioned in the * table during startup and gets updated whenever integration time * or gain is changed. * * Table 'resolution and maximum detection range' in appnote 84367 * is visualized as a 2D array. The cur_gain stores index of gain * in this table (0-3) while the cur_integration_time holds index * of integration time (0-5). */ struct veml6030_data { … }; /* Integration time available in seconds */ static IIO_CONST_ATTR(in_illuminance_integration_time_available, "0.025 0.05 0.1 0.2 0.4 0.8"); /* * Scale is 1/gain. Value 0.125 is ALS gain x (1/8), 0.25 is * ALS gain x (1/4), 1.0 = ALS gain x 1 and 2.0 is ALS gain x 2. */ static IIO_CONST_ATTR(in_illuminance_scale_available, "0.125 0.25 1.0 2.0"); static struct attribute *veml6030_attributes[] = …; static const struct attribute_group veml6030_attr_group = …; /* * Persistence = 1/2/4/8 x integration time * Minimum time for which light readings must stay above configured * threshold to assert the interrupt. */ static const char * const period_values[] = …; /* * Return list of valid period values in seconds corresponding to * the currently active integration time. */ static ssize_t in_illuminance_period_available_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static IIO_DEVICE_ATTR_RO(in_illuminance_period_available, 0); static struct attribute *veml6030_event_attributes[] = …; static const struct attribute_group veml6030_event_attr_group = …; static int veml6030_als_pwr_on(struct veml6030_data *data) { … } static int veml6030_als_shut_down(struct veml6030_data *data) { … } static void veml6030_als_shut_down_action(void *data) { … } static const struct iio_event_spec veml6030_event_spec[] = …; /* Channel number */ enum veml6030_chan { … }; static const struct iio_chan_spec veml6030_channels[] = …; static const struct regmap_config veml6030_regmap_config = …; static int veml6030_get_intgrn_tm(struct iio_dev *indio_dev, int *val, int *val2) { … } static int veml6030_set_intgrn_tm(struct iio_dev *indio_dev, int val, int val2) { … } static int veml6030_read_persistence(struct iio_dev *indio_dev, int *val, int *val2) { … } static int veml6030_write_persistence(struct iio_dev *indio_dev, int val, int val2) { … } static int veml6030_set_als_gain(struct iio_dev *indio_dev, int val, int val2) { … } static int veml6030_get_als_gain(struct iio_dev *indio_dev, int *val, int *val2) { … } static int veml6030_read_thresh(struct iio_dev *indio_dev, int *val, int *val2, int dir) { … } static int veml6030_write_thresh(struct iio_dev *indio_dev, int val, int val2, int dir) { … } /* * Provide both raw as well as light reading in lux. * light (in lux) = resolution * raw reading */ static int veml6030_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int veml6030_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int veml6030_read_event_val(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int *val, int *val2) { … } static int veml6030_write_event_val(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, enum iio_event_info info, int val, int val2) { … } static int veml6030_read_interrupt_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { … } /* * Sensor should not be measuring light when interrupt is configured. * Therefore correct sequence to configure interrupt functionality is: * shut down -> enable/disable interrupt -> power on * * state = 1 enables interrupt, state = 0 disables interrupt */ static int veml6030_write_interrupt_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir, int state) { … } static const struct iio_info veml6030_info = …; static const struct iio_info veml6030_info_no_irq = …; static irqreturn_t veml6030_event_handler(int irq, void *private) { … } /* * Set ALS gain to 1/8, integration time to 100 ms, PSM to mode 2, * persistence to 1 x integration time and the threshold * interrupt disabled by default. First shutdown the sensor, * update registers and then power on the sensor. */ static int veml6030_hw_init(struct iio_dev *indio_dev) { … } static int veml6030_probe(struct i2c_client *client) { … } static int veml6030_runtime_suspend(struct device *dev) { … } static int veml6030_runtime_resume(struct device *dev) { … } static DEFINE_RUNTIME_DEV_PM_OPS(veml6030_pm_ops, veml6030_runtime_suspend, veml6030_runtime_resume, NULL); static const struct of_device_id veml6030_of_match[] = …; MODULE_DEVICE_TABLE(of, veml6030_of_match); static const struct i2c_device_id veml6030_id[] = …; MODULE_DEVICE_TABLE(i2c, veml6030_id); static struct i2c_driver veml6030_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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