// SPDX-License-Identifier: GPL-2.0 /* * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747 * * Copyright 2011 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/stat.h> #include <linux/sysfs.h> #include <linux/unaligned.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> /* AD7746 Register Definition */ #define AD7746_REG_STATUS … #define AD7746_REG_CAP_DATA_HIGH … #define AD7746_REG_VT_DATA_HIGH … #define AD7746_REG_CAP_SETUP … #define AD7746_REG_VT_SETUP … #define AD7746_REG_EXC_SETUP … #define AD7746_REG_CFG … #define AD7746_REG_CAPDACA … #define AD7746_REG_CAPDACB … #define AD7746_REG_CAP_OFFH … #define AD7746_REG_CAP_GAINH … #define AD7746_REG_VOLT_GAINH … /* Status Register Bit Designations (AD7746_REG_STATUS) */ #define AD7746_STATUS_EXCERR … #define AD7746_STATUS_RDY … #define AD7746_STATUS_RDYVT … #define AD7746_STATUS_RDYCAP … /* Capacitive Channel Setup Register Bit Designations (AD7746_REG_CAP_SETUP) */ #define AD7746_CAPSETUP_CAPEN … #define AD7746_CAPSETUP_CIN2 … #define AD7746_CAPSETUP_CAPDIFF … #define AD7746_CAPSETUP_CACHOP … /* Voltage/Temperature Setup Register Bit Designations (AD7746_REG_VT_SETUP) */ #define AD7746_VTSETUP_VTEN … #define AD7746_VTSETUP_VTMD_MASK … #define AD7746_VTSETUP_VTMD_INT_TEMP … #define AD7746_VTSETUP_VTMD_EXT_TEMP … #define AD7746_VTSETUP_VTMD_VDD_MON … #define AD7746_VTSETUP_VTMD_EXT_VIN … #define AD7746_VTSETUP_EXTREF … #define AD7746_VTSETUP_VTSHORT … #define AD7746_VTSETUP_VTCHOP … /* Excitation Setup Register Bit Designations (AD7746_REG_EXC_SETUP) */ #define AD7746_EXCSETUP_CLKCTRL … #define AD7746_EXCSETUP_EXCON … #define AD7746_EXCSETUP_EXCB … #define AD7746_EXCSETUP_NEXCB … #define AD7746_EXCSETUP_EXCA … #define AD7746_EXCSETUP_NEXCA … #define AD7746_EXCSETUP_EXCLVL_MASK … /* Config Register Bit Designations (AD7746_REG_CFG) */ #define AD7746_CONF_VTFS_MASK … #define AD7746_CONF_CAPFS_MASK … #define AD7746_CONF_MODE_MASK … #define AD7746_CONF_MODE_IDLE … #define AD7746_CONF_MODE_CONT_CONV … #define AD7746_CONF_MODE_SINGLE_CONV … #define AD7746_CONF_MODE_PWRDN … #define AD7746_CONF_MODE_OFFS_CAL … #define AD7746_CONF_MODE_GAIN_CAL … /* CAPDAC Register Bit Designations (AD7746_REG_CAPDACx) */ #define AD7746_CAPDAC_DACEN … #define AD7746_CAPDAC_DACP_MASK … struct ad7746_chip_info { … }; enum ad7746_chan { … }; struct ad7746_chan_info { … }; static const struct ad7746_chan_info ad7746_chan_info[] = …; static const struct iio_chan_spec ad7746_channels[] = …; /* Values are Update Rate (Hz), Conversion Time (ms) + 1*/ static const unsigned char ad7746_vt_filter_rate_table[][2] = …; static const unsigned char ad7746_cap_filter_rate_table[][2] = …; static int ad7746_set_capdac(struct ad7746_chip_info *chip, int channel) { … } static int ad7746_select_channel(struct iio_dev *indio_dev, struct iio_chan_spec const *chan) { … } static inline ssize_t ad7746_start_calib(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, u8 regval) { … } static ssize_t ad7746_start_offset_calib(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { … } static ssize_t ad7746_start_gain_calib(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { … } static IIO_DEVICE_ATTR(in_capacitance0_calibbias_calibration, 0200, NULL, ad7746_start_offset_calib, CIN1); static IIO_DEVICE_ATTR(in_capacitance1_calibbias_calibration, 0200, NULL, ad7746_start_offset_calib, CIN2); static IIO_DEVICE_ATTR(in_capacitance0_calibscale_calibration, 0200, NULL, ad7746_start_gain_calib, CIN1); static IIO_DEVICE_ATTR(in_capacitance1_calibscale_calibration, 0200, NULL, ad7746_start_gain_calib, CIN2); static IIO_DEVICE_ATTR(in_voltage0_calibscale_calibration, 0200, NULL, ad7746_start_gain_calib, VIN); static int ad7746_store_cap_filter_rate_setup(struct ad7746_chip_info *chip, int val) { … } static int ad7746_store_vt_filter_rate_setup(struct ad7746_chip_info *chip, int val) { … } static struct attribute *ad7746_attributes[] = …; static const struct attribute_group ad7746_attribute_group = …; static int ad7746_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static const int ad7746_v_samp_freq[] = …; static const int ad7746_cap_samp_freq[] = …; static int ad7746_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { … } static int ad7746_read_channel(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val) { … } static int ad7746_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static const struct iio_info ad7746_info = …; static int ad7746_probe(struct i2c_client *client) { … } static const struct i2c_device_id ad7746_id[] = …; MODULE_DEVICE_TABLE(i2c, ad7746_id); static const struct of_device_id ad7746_of_match[] = …; MODULE_DEVICE_TABLE(of, ad7746_of_match); static struct i2c_driver ad7746_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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