// SPDX-License-Identifier: GPL-2.0 /* * Analog Devices AD7768-1 SPI ADC driver * * Copyright 2017 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/regulator/consumer.h> #include <linux/sysfs.h> #include <linux/spi/spi.h> #include <linux/iio/buffer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/trigger.h> #include <linux/iio/triggered_buffer.h> #include <linux/iio/trigger_consumer.h> /* AD7768 registers definition */ #define AD7768_REG_CHIP_TYPE … #define AD7768_REG_PROD_ID_L … #define AD7768_REG_PROD_ID_H … #define AD7768_REG_CHIP_GRADE … #define AD7768_REG_SCRATCH_PAD … #define AD7768_REG_VENDOR_L … #define AD7768_REG_VENDOR_H … #define AD7768_REG_INTERFACE_FORMAT … #define AD7768_REG_POWER_CLOCK … #define AD7768_REG_ANALOG … #define AD7768_REG_ANALOG2 … #define AD7768_REG_CONVERSION … #define AD7768_REG_DIGITAL_FILTER … #define AD7768_REG_SINC3_DEC_RATE_MSB … #define AD7768_REG_SINC3_DEC_RATE_LSB … #define AD7768_REG_DUTY_CYCLE_RATIO … #define AD7768_REG_SYNC_RESET … #define AD7768_REG_GPIO_CONTROL … #define AD7768_REG_GPIO_WRITE … #define AD7768_REG_GPIO_READ … #define AD7768_REG_OFFSET_HI … #define AD7768_REG_OFFSET_MID … #define AD7768_REG_OFFSET_LO … #define AD7768_REG_GAIN_HI … #define AD7768_REG_GAIN_MID … #define AD7768_REG_GAIN_LO … #define AD7768_REG_SPI_DIAG_ENABLE … #define AD7768_REG_ADC_DIAG_ENABLE … #define AD7768_REG_DIG_DIAG_ENABLE … #define AD7768_REG_ADC_DATA … #define AD7768_REG_MASTER_STATUS … #define AD7768_REG_SPI_DIAG_STATUS … #define AD7768_REG_ADC_DIAG_STATUS … #define AD7768_REG_DIG_DIAG_STATUS … #define AD7768_REG_MCLK_COUNTER … /* AD7768_REG_POWER_CLOCK */ #define AD7768_PWR_MCLK_DIV_MSK … #define AD7768_PWR_MCLK_DIV(x) … #define AD7768_PWR_PWRMODE_MSK … #define AD7768_PWR_PWRMODE(x) … /* AD7768_REG_DIGITAL_FILTER */ #define AD7768_DIG_FIL_FIL_MSK … #define AD7768_DIG_FIL_FIL(x) … #define AD7768_DIG_FIL_DEC_MSK … #define AD7768_DIG_FIL_DEC_RATE(x) … /* AD7768_REG_CONVERSION */ #define AD7768_CONV_MODE_MSK … #define AD7768_CONV_MODE(x) … #define AD7768_RD_FLAG_MSK(x) … #define AD7768_WR_FLAG_MSK(x) … enum ad7768_conv_mode { … }; enum ad7768_pwrmode { … }; enum ad7768_mclk_div { … }; enum ad7768_dec_rate { … }; struct ad7768_clk_configuration { … }; static const struct ad7768_clk_configuration ad7768_clk_config[] = …; static const struct iio_chan_spec ad7768_channels[] = …; struct ad7768_state { … }; static int ad7768_spi_reg_read(struct ad7768_state *st, unsigned int addr, unsigned int len) { … } static int ad7768_spi_reg_write(struct ad7768_state *st, unsigned int addr, unsigned int val) { … } static int ad7768_set_mode(struct ad7768_state *st, enum ad7768_conv_mode mode) { … } static int ad7768_scan_direct(struct iio_dev *indio_dev) { … } static int ad7768_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static int ad7768_set_dig_fil(struct ad7768_state *st, enum ad7768_dec_rate dec_rate) { … } static int ad7768_set_freq(struct ad7768_state *st, unsigned int freq) { … } static ssize_t ad7768_sampling_freq_avail(struct device *dev, struct device_attribute *attr, char *buf) { … } static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ad7768_sampling_freq_avail); static int ad7768_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long info) { … } static int ad7768_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long info) { … } static int ad7768_read_label(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, char *label) { … } static struct attribute *ad7768_attributes[] = …; static const struct attribute_group ad7768_group = …; static const struct iio_info ad7768_info = …; static int ad7768_setup(struct ad7768_state *st) { … } static irqreturn_t ad7768_trigger_handler(int irq, void *p) { … } static irqreturn_t ad7768_interrupt(int irq, void *dev_id) { struct iio_dev *indio_dev = dev_id; struct ad7768_state *st = iio_priv(indio_dev); if (iio_buffer_enabled(indio_dev)) iio_trigger_poll(st->trig); else complete(&st->completion); return IRQ_HANDLED; }; static int ad7768_buffer_postenable(struct iio_dev *indio_dev) { … } static int ad7768_buffer_predisable(struct iio_dev *indio_dev) { … } static const struct iio_buffer_setup_ops ad7768_buffer_ops = …; static const struct iio_trigger_ops ad7768_trigger_ops = …; static void ad7768_regulator_disable(void *data) { … } static int ad7768_set_channel_label(struct iio_dev *indio_dev, int num_channels) { … } static int ad7768_probe(struct spi_device *spi) { … } static const struct spi_device_id ad7768_id_table[] = …; MODULE_DEVICE_TABLE(spi, ad7768_id_table); static const struct of_device_id ad7768_of_match[] = …; MODULE_DEVICE_TABLE(of, ad7768_of_match); static struct spi_driver ad7768_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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