// SPDX-License-Identifier: GPL-2.0-only /* * Texas Instruments ADS1119 ADC driver. * * Copyright 2024 Toradex */ #include <linux/bits.h> #include <linux/bitfield.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/dev_printk.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/interrupt.h> #include <linux/iopoll.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/math.h> #include <linux/module.h> #include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <linux/units.h> #include <linux/iio/iio.h> #include <linux/iio/buffer.h> #include <linux/iio/trigger.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/trigger_consumer.h> #define ADS1119_CMD_RESET … #define ADS1119_CMD_POWERDOWN … #define ADS1119_CMD_START_SYNC … #define ADS1119_CMD_RDATA … #define ADS1119_CMD_RREG_CONFIG … #define ADS1119_CMD_RREG_STATUS … #define ADS1119_CMD_WREG … #define ADS1119_CMD_RREG(reg) … /* Config register */ #define ADS1119_REG_CONFIG … #define ADS1119_CONFIG_VREF_FIELD … #define ADS1119_CONFIG_CM_FIELD … #define ADS1119_CONFIG_DR_FIELD … #define ADS1119_CONFIG_GAIN_FIELD … #define ADS1119_CONFIG_MUX_FIELD … #define ADS1119_VREF_INTERNAL … #define ADS1119_VREF_EXTERNAL … #define ADS1119_VREF_INTERNAL_VAL … #define ADS1119_CM_SINGLE … #define ADS1119_CM_CONTINUOUS … #define ADS1119_DR_20_SPS … #define ADS1119_DR_90_SPS … #define ADS1119_DR_330_SPS … #define ADS1119_DR_1000_SPS … #define ADS1119_GAIN_1 … #define ADS1119_GAIN_4 … #define ADS1119_MUX_AIN0_AIN1 … #define ADS1119_MUX_AIN2_AIN3 … #define ADS1119_MUX_AIN1_AIN2 … #define ADS1119_MUX_AIN0 … #define ADS1119_MUX_AIN1 … #define ADS1119_MUX_AIN2 … #define ADS1119_MUX_AIN3 … #define ADS1119_MUX_SHORTED … /* Status register */ #define ADS1119_REG_STATUS … #define ADS1119_STATUS_DRDY_FIELD … #define ADS1119_DEFAULT_GAIN … #define ADS1119_DEFAULT_DATARATE … #define ADS1119_SUSPEND_DELAY … /* Timeout based on the minimum sample rate of 20 SPS (50000us) */ #define ADS1119_MAX_DRDY_TIMEOUT … #define ADS1119_MAX_CHANNELS … #define ADS1119_MAX_SINGLE_CHANNELS … struct ads1119_channel_config { … }; struct ads1119_state { … }; static const char * const ads1119_power_supplies[] = …; static const int ads1119_available_datarates[] = …; static const int ads1119_available_gains[] = …; static int ads1119_upd_cfg_reg(struct ads1119_state *st, unsigned int fields, unsigned int val) { … } static bool ads1119_data_ready(struct ads1119_state *st) { … } static int ads1119_reset(struct ads1119_state *st) { … } static int ads1119_set_conv_mode(struct ads1119_state *st, bool continuous) { … } static int ads1119_get_hw_gain(int gain) { … } static int ads1119_get_hw_datarate(int datarate) { … } static int ads1119_configure_channel(struct ads1119_state *st, int mux, int gain, int datarate) { … } static int ads1119_poll_data_ready(struct ads1119_state *st, struct iio_chan_spec const *chan) { … } static int ads1119_read_data(struct ads1119_state *st, struct iio_chan_spec const *chan, unsigned int *val) { … } static int ads1119_single_conversion(struct ads1119_state *st, struct iio_chan_spec const *chan, int *val, bool calib_offset) { … } static int ads1119_validate_datarate(struct ads1119_state *st, int datarate) { … } static int ads1119_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { … } static int ads1119_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int ads1119_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static int ads1119_debugfs_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static const struct iio_info ads1119_info = …; static int ads1119_triggered_buffer_preenable(struct iio_dev *indio_dev) { … } static int ads1119_triggered_buffer_postdisable(struct iio_dev *indio_dev) { … } static const struct iio_buffer_setup_ops ads1119_buffer_setup_ops = …; static const struct iio_trigger_ops ads1119_trigger_ops = …; static irqreturn_t ads1119_irq_handler(int irq, void *dev_id) { … } static irqreturn_t ads1119_trigger_handler(int irq, void *private) { … } static int ads1119_init(struct ads1119_state *st, bool vref_external) { … } static int ads1119_map_analog_inputs_mux(int ain_pos, int ain_neg, bool differential) { … } static int ads1119_alloc_and_config_channels(struct iio_dev *indio_dev) { … } static void ads1119_powerdown(void *data) { … } static int ads1119_probe(struct i2c_client *client) { … } static int ads1119_runtime_suspend(struct device *dev) { … } /* * The ADS1119 does not require a resume function because it automatically * powers on after a reset. * After a power down command, the ADS1119 can still communicate but turns off * its analog parts. To resume from power down, the device will power up again * upon receiving a start/sync command. */ static DEFINE_RUNTIME_DEV_PM_OPS(ads1119_pm_ops, ads1119_runtime_suspend, NULL, NULL); static const struct of_device_id __maybe_unused ads1119_of_match[] = …; MODULE_DEVICE_TABLE(of, ads1119_of_match); static const struct i2c_device_id ads1119_id[] = …; MODULE_DEVICE_TABLE(i2c, ads1119_id); static struct i2c_driver ads1119_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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