// SPDX-License-Identifier: GPL-2.0 /* * Copyright 2021 Google LLC. * * Driver for Semtech's SX9360 capacitive proximity/button solution. * Based on SX9360 driver and copy of datasheet at: * https://edit.wpgdadawant.com/uploads/news_file/program/2019/30184/tech_files/program_30184_suggest_other_file.pdf */ #include <linux/acpi.h> #include <linux/bits.h> #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/i2c.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/log2.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/pm.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/iio/iio.h> #include "sx_common.h" /* Nominal Oscillator Frequency. */ #define SX9360_FOSC_MHZ … #define SX9360_FOSC_HZ … /* Register definitions. */ #define SX9360_REG_IRQ_SRC … #define SX9360_REG_STAT … #define SX9360_REG_STAT_COMPSTAT_MASK … #define SX9360_REG_IRQ_MSK … #define SX9360_CONVDONE_IRQ … #define SX9360_FAR_IRQ … #define SX9360_CLOSE_IRQ … #define SX9360_REG_IRQ_CFG … #define SX9360_REG_GNRL_CTRL0 … #define SX9360_REG_GNRL_CTRL0_PHEN_MASK … #define SX9360_REG_GNRL_CTRL1 … #define SX9360_REG_GNRL_CTRL1_SCANPERIOD_MASK … #define SX9360_REG_GNRL_CTRL2 … #define SX9360_REG_GNRL_CTRL2_PERIOD_102MS … #define SX9360_REG_GNRL_REG_2_PERIOD_MS(_r) … #define SX9360_REG_GNRL_FREQ_2_REG(_f) … #define SX9360_REG_GNRL_REG_2_FREQ(_r) … #define SX9360_REG_AFE_CTRL1 … #define SX9360_REG_AFE_CTRL1_RESFILTIN_MASK … #define SX9360_REG_AFE_CTRL1_RESFILTIN_0OHMS … #define SX9360_REG_AFE_PARAM0_PHR … #define SX9360_REG_AFE_PARAM1_PHR … #define SX9360_REG_AFE_PARAM0_PHM … #define SX9360_REG_AFE_PARAM0_RSVD … #define SX9360_REG_AFE_PARAM0_RESOLUTION_MASK … #define SX9360_REG_AFE_PARAM0_RESOLUTION_128 … #define SX9360_REG_AFE_PARAM1_PHM … #define SX9360_REG_AFE_PARAM1_AGAIN_PHM_6PF … #define SX9360_REG_AFE_PARAM1_FREQ_83_33HZ … #define SX9360_REG_PROX_CTRL0_PHR … #define SX9360_REG_PROX_CTRL0_PHM … #define SX9360_REG_PROX_CTRL0_GAIN_MASK … #define SX9360_REG_PROX_CTRL0_GAIN_1 … #define SX9360_REG_PROX_CTRL0_RAWFILT_MASK … #define SX9360_REG_PROX_CTRL0_RAWFILT_1P50 … #define SX9360_REG_PROX_CTRL1 … #define SX9360_REG_PROX_CTRL1_AVGNEG_THRESH_MASK … #define SX9360_REG_PROX_CTRL1_AVGNEG_THRESH_16K … #define SX9360_REG_PROX_CTRL2 … #define SX9360_REG_PROX_CTRL2_AVGDEB_MASK … #define SX9360_REG_PROX_CTRL2_AVGDEB_2SAMPLES … #define SX9360_REG_PROX_CTRL2_AVGPOS_THRESH_16K … #define SX9360_REG_PROX_CTRL3 … #define SX9360_REG_PROX_CTRL3_AVGNEG_FILT_MASK … #define SX9360_REG_PROX_CTRL3_AVGNEG_FILT_2 … #define SX9360_REG_PROX_CTRL3_AVGPOS_FILT_MASK … #define SX9360_REG_PROX_CTRL3_AVGPOS_FILT_256 … #define SX9360_REG_PROX_CTRL4 … #define SX9360_REG_PROX_CTRL4_HYST_MASK … #define SX9360_REG_PROX_CTRL4_CLOSE_DEBOUNCE_MASK … #define SX9360_REG_PROX_CTRL4_FAR_DEBOUNCE_MASK … #define SX9360_REG_PROX_CTRL5 … #define SX9360_REG_PROX_CTRL5_PROXTHRESH_32 … #define SX9360_REG_REF_CORR0 … #define SX9360_REG_REF_CORR1 … #define SX9360_REG_USEFUL_PHR_MSB … #define SX9360_REG_USEFUL_PHR_LSB … #define SX9360_REG_OFFSET_PMR_MSB … #define SX9360_REG_OFFSET_PMR_LSB … #define SX9360_REG_USEFUL_PHM_MSB … #define SX9360_REG_USEFUL_PHM_LSB … #define SX9360_REG_AVG_PHM_MSB … #define SX9360_REG_AVG_PHM_LSB … #define SX9360_REG_DIFF_PHM_MSB … #define SX9360_REG_DIFF_PHM_LSB … #define SX9360_REG_OFFSET_PHM_MSB … #define SX9360_REG_OFFSET_PHM_LSB … #define SX9360_REG_USE_FILTER_MSB … #define SX9360_REG_USE_FILTER_LSB … #define SX9360_REG_RESET … /* Write this to REG_RESET to do a soft reset. */ #define SX9360_SOFT_RESET … #define SX9360_REG_WHOAMI … #define SX9360_WHOAMI_VALUE … #define SX9360_REG_REVISION … /* 2 channels, Phase Reference and Measurement. */ #define SX9360_NUM_CHANNELS … static const struct iio_chan_spec sx9360_channels[] = …; /* * Each entry contains the integer part (val) and the fractional part, in micro * seconds. It conforms to the IIO output IIO_VAL_INT_PLUS_MICRO. * * The frequency control register holds the period, with a ~2ms increment. * Therefore the smallest frequency is 4MHz / (2047 * 8192), * The fastest is 4MHz / 8192. * The interval is not linear, but given there is 2047 possible value, * Returns the fake increment of (Max-Min)/2047 */ static const struct { … } sx9360_samp_freq_interval[] = …; static const struct regmap_range sx9360_writable_reg_ranges[] = …; static const struct regmap_access_table sx9360_writeable_regs = …; /* * All allocated registers are readable, so we just list unallocated * ones. */ static const struct regmap_range sx9360_non_readable_reg_ranges[] = …; static const struct regmap_access_table sx9360_readable_regs = …; static const struct regmap_range sx9360_volatile_reg_ranges[] = …; static const struct regmap_access_table sx9360_volatile_regs = …; static const struct regmap_config sx9360_regmap_config = …; static int sx9360_read_prox_data(struct sx_common_data *data, const struct iio_chan_spec *chan, __be16 *val) { … } /* * If we have no interrupt support, we have to wait for a scan period * after enabling a channel to get a result. */ static int sx9360_wait_for_sample(struct sx_common_data *data) { … } static int sx9360_read_gain(struct sx_common_data *data, const struct iio_chan_spec *chan, int *val) { … } static int sx9360_read_samp_freq(struct sx_common_data *data, int *val, int *val2) { … } static int sx9360_read_raw(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int *val, int *val2, long mask) { … } static const char *sx9360_channel_labels[SX9360_NUM_CHANNELS] = …; static int sx9360_read_label(struct iio_dev *iio_dev, const struct iio_chan_spec *chan, char *label) { … } static const int sx9360_gain_vals[] = …; static int sx9360_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long mask) { … } static int sx9360_set_samp_freq(struct sx_common_data *data, int val, int val2) { … } static int sx9360_read_thresh(struct sx_common_data *data, int *val) { … } static int sx9360_read_hysteresis(struct sx_common_data *data, int *val) { … } static int sx9360_read_far_debounce(struct sx_common_data *data, int *val) { … } static int sx9360_read_close_debounce(struct sx_common_data *data, int *val) { … } static int sx9360_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 sx9360_write_thresh(struct sx_common_data *data, int _val) { … } static int sx9360_write_hysteresis(struct sx_common_data *data, int _val) { … } static int sx9360_write_far_debounce(struct sx_common_data *data, int _val) { … } static int sx9360_write_close_debounce(struct sx_common_data *data, int _val) { … } static int sx9360_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 sx9360_write_gain(struct sx_common_data *data, const struct iio_chan_spec *chan, int val) { … } static int sx9360_write_raw(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, int val, int val2, long mask) { … } static const struct sx_common_reg_default sx9360_default_regs[] = …; /* Activate all channels and perform an initial compensation. */ static int sx9360_init_compensation(struct iio_dev *indio_dev) { … } static const struct sx_common_reg_default * sx9360_get_default_reg(struct device *dev, int idx, struct sx_common_reg_default *reg_def) { … } static int sx9360_check_whoami(struct device *dev, struct iio_dev *indio_dev) { … } static const struct sx_common_chip_info sx9360_chip_info = …; static int sx9360_probe(struct i2c_client *client) { … } static int sx9360_suspend(struct device *dev) { … } static int sx9360_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(sx9360_pm_ops, sx9360_suspend, sx9360_resume); static const struct acpi_device_id sx9360_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, sx9360_acpi_match); static const struct of_device_id sx9360_of_match[] = …; MODULE_DEVICE_TABLE(of, sx9360_of_match); static const struct i2c_device_id sx9360_id[] = …; MODULE_DEVICE_TABLE(i2c, sx9360_id); static struct i2c_driver sx9360_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_IMPORT_NS(…);
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