// SPDX-License-Identifier: GPL-2.0+ /* * AD7150 capacitive sensor driver supporting AD7150/1/6 * * Copyright 2010-2011 Analog Devices Inc. * Copyright 2021 Jonathan Cameron <[email protected]> */ #include <linux/bitfield.h> #include <linux/device.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/events.h> #define AD7150_STATUS_REG … #define AD7150_STATUS_OUT1 … #define AD7150_STATUS_OUT2 … #define AD7150_CH1_DATA_HIGH_REG … #define AD7150_CH2_DATA_HIGH_REG … #define AD7150_CH1_AVG_HIGH_REG … #define AD7150_CH2_AVG_HIGH_REG … #define AD7150_CH1_SENSITIVITY_REG … #define AD7150_CH1_THR_HOLD_H_REG … #define AD7150_CH1_TIMEOUT_REG … #define AD7150_CH_TIMEOUT_RECEDING … #define AD7150_CH_TIMEOUT_APPROACHING … #define AD7150_CH1_SETUP_REG … #define AD7150_CH2_SENSITIVITY_REG … #define AD7150_CH2_THR_HOLD_H_REG … #define AD7150_CH2_TIMEOUT_REG … #define AD7150_CH2_SETUP_REG … #define AD7150_CFG_REG … #define AD7150_CFG_FIX … #define AD7150_CFG_THRESHTYPE_MSK … #define AD7150_CFG_TT_NEG … #define AD7150_CFG_TT_POS … #define AD7150_CFG_TT_IN_WINDOW … #define AD7150_CFG_TT_OUT_WINDOW … #define AD7150_PD_TIMER_REG … #define AD7150_CH1_CAPDAC_REG … #define AD7150_CH2_CAPDAC_REG … #define AD7150_SN3_REG … #define AD7150_SN2_REG … #define AD7150_SN1_REG … #define AD7150_SN0_REG … #define AD7150_ID_REG … enum { … }; /** * struct ad7150_chip_info - instance specific chip data * @client: i2c client for this device * @threshold: thresholds for simple capacitance value events * @thresh_sensitivity: threshold for simple capacitance offset * from 'average' value. * @thresh_timeout: a timeout, in samples from the moment an * adaptive threshold event occurs to when the average * value jumps to current value. Note made up of two fields, * 3:0 are for timeout receding - applies if below lower threshold * 7:4 are for timeout approaching - applies if above upper threshold * @state_lock: ensure consistent state of this structure wrt the * hardware. * @interrupts: one or two interrupt numbers depending on device type. * @int_enabled: is a given interrupt currently enabled. * @type: threshold type * @dir: threshold direction */ struct ad7150_chip_info { … }; static const u8 ad7150_addresses[][6] = …; static int ad7150_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int ad7150_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, enum iio_event_type type, enum iio_event_direction dir) { … } /* state_lock should be held to ensure consistent state */ static int ad7150_write_event_params(struct iio_dev *indio_dev, unsigned int chan, enum iio_event_type type, enum iio_event_direction dir) { … } static int ad7150_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 ad7150_read_event_value(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 ad7150_write_event_value(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 ad7150_events[] = …; #define AD7150_CAPACITANCE_CHAN(_chan) … #define AD7150_CAPACITANCE_CHAN_NO_IRQ(_chan) … static const struct iio_chan_spec ad7150_channels[] = …; static const struct iio_chan_spec ad7150_channels_no_irq[] = …; static const struct iio_chan_spec ad7151_channels[] = …; static const struct iio_chan_spec ad7151_channels_no_irq[] = …; static irqreturn_t __ad7150_event_handler(void *private, u8 status_mask, int channel) { … } static irqreturn_t ad7150_event_handler_ch1(int irq, void *private) { … } static irqreturn_t ad7150_event_handler_ch2(int irq, void *private) { … } static IIO_CONST_ATTR(in_capacitance_thresh_adaptive_timeout_available, "[0 0.01 0.15]"); static struct attribute *ad7150_event_attributes[] = …; static const struct attribute_group ad7150_event_attribute_group = …; static const struct iio_info ad7150_info = …; static const struct iio_info ad7150_info_no_irq = …; static int ad7150_probe(struct i2c_client *client) { … } static const struct i2c_device_id ad7150_id[] = …; MODULE_DEVICE_TABLE(i2c, ad7150_id); static const struct of_device_id ad7150_of_match[] = …; static struct i2c_driver ad7150_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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