// SPDX-License-Identifier: GPL-2.0+ /* * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor * * Copyright (C) 2019 Linaro Ltd. * Author: Manivannan Sadhasivam <[email protected]> * * TODO: Triggered buffer support */ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/i2c.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/regmap.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/events.h> #define ADUX1020_REGMAP_NAME … #define ADUX1020_DRV_NAME … /* System registers */ #define ADUX1020_REG_CHIP_ID … #define ADUX1020_REG_SLAVE_ADDRESS … #define ADUX1020_REG_SW_RESET … #define ADUX1020_REG_INT_ENABLE … #define ADUX1020_REG_INT_POLARITY … #define ADUX1020_REG_PROX_TH_ON1 … #define ADUX1020_REG_PROX_TH_OFF1 … #define ADUX1020_REG_PROX_TYPE … #define ADUX1020_REG_TEST_MODES_3 … #define ADUX1020_REG_FORCE_MODE … #define ADUX1020_REG_FREQUENCY … #define ADUX1020_REG_LED_CURRENT … #define ADUX1020_REG_OP_MODE … #define ADUX1020_REG_INT_MASK … #define ADUX1020_REG_INT_STATUS … #define ADUX1020_REG_DATA_BUFFER … /* Chip ID bits */ #define ADUX1020_CHIP_ID_MASK … #define ADUX1020_CHIP_ID … #define ADUX1020_SW_RESET … #define ADUX1020_FIFO_FLUSH … #define ADUX1020_OP_MODE_MASK … #define ADUX1020_DATA_OUT_MODE_MASK … #define ADUX1020_DATA_OUT_PROX_I … #define ADUX1020_MODE_INT_MASK … #define ADUX1020_INT_ENABLE … #define ADUX1020_INT_DISABLE … #define ADUX1020_PROX_INT_ENABLE … #define ADUX1020_PROX_ON1_INT … #define ADUX1020_PROX_OFF1_INT … #define ADUX1020_FIFO_INT_ENABLE … #define ADUX1020_MODE_INT_DISABLE … #define ADUX1020_MODE_INT_STATUS_MASK … #define ADUX1020_FIFO_STATUS_MASK … #define ADUX1020_INT_CLEAR … #define ADUX1020_PROX_TYPE … #define ADUX1020_INT_PROX_ON1 … #define ADUX1020_INT_PROX_OFF1 … #define ADUX1020_FORCE_CLOCK_ON … #define ADUX1020_FORCE_CLOCK_RESET … #define ADUX1020_ACTIVE_4_STATE … #define ADUX1020_PROX_FREQ_MASK … #define ADUX1020_PROX_FREQ(x) … #define ADUX1020_LED_CURRENT_MASK … #define ADUX1020_LED_PIREF_EN … /* Operating modes */ enum adux1020_op_modes { … }; struct adux1020_data { … }; struct adux1020_mode_data { … }; static const struct adux1020_mode_data adux1020_modes[] = …; static const struct regmap_config adux1020_regmap_config = …; static const struct reg_sequence adux1020_def_conf[] = …; static const int adux1020_rates[][2] = …; static const int adux1020_led_currents[][2] = …; static int adux1020_flush_fifo(struct adux1020_data *data) { … } static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len) { … } static int adux1020_set_mode(struct adux1020_data *data, enum adux1020_op_modes mode) { … } static int adux1020_measure(struct adux1020_data *data, enum adux1020_op_modes mode, u16 *val) { … } static int adux1020_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { struct adux1020_data *data = iio_priv(indio_dev); u16 buf[3]; int ret = -EINVAL; unsigned int regval; mutex_lock(&data->lock); switch (mask) { case IIO_CHAN_INFO_RAW: switch (chan->type) { case IIO_PROXIMITY: ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I); if (ret < 0) goto fail; ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf); if (ret < 0) goto fail; *val = buf[0]; ret = IIO_VAL_INT; break; default: break; } break; case IIO_CHAN_INFO_PROCESSED: switch (chan->type) { case IIO_CURRENT: ret = regmap_read(data->regmap, ADUX1020_REG_LED_CURRENT, ®val); if (ret < 0) goto fail; regval = regval & ADUX1020_LED_CURRENT_MASK; *val = adux1020_led_currents[regval][0]; *val2 = adux1020_led_currents[regval][1]; ret = IIO_VAL_INT_PLUS_MICRO; break; default: break; } break; case IIO_CHAN_INFO_SAMP_FREQ: switch (chan->type) { case IIO_PROXIMITY: ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY, ®val); if (ret < 0) goto fail; regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval); *val = adux1020_rates[regval][0]; *val2 = adux1020_rates[regval][1]; ret = IIO_VAL_INT_PLUS_MICRO; break; default: break; } break; default: break; } fail: mutex_unlock(&data->lock); return ret; }; static inline int adux1020_find_index(const int array[][2], int count, int val, int val2) { … } static int adux1020_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int adux1020_write_event_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 int adux1020_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { … } static int adux1020_read_thresh(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 adux1020_write_thresh(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 const struct iio_event_spec adux1020_proximity_event[] = …; static const struct iio_chan_spec adux1020_channels[] = …; static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400"); static struct attribute *adux1020_attributes[] = …; static const struct attribute_group adux1020_attribute_group = …; static const struct iio_info adux1020_info = …; static irqreturn_t adux1020_interrupt_handler(int irq, void *private) { … } static int adux1020_chip_init(struct adux1020_data *data) { … } static int adux1020_probe(struct i2c_client *client) { … } static const struct i2c_device_id adux1020_id[] = …; MODULE_DEVICE_TABLE(i2c, adux1020_id); static const struct of_device_id adux1020_of_match[] = …; MODULE_DEVICE_TABLE(of, adux1020_of_match); static struct i2c_driver adux1020_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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