// SPDX-License-Identifier: GPL-2.0 /* * LTC2688 16 channel, 16 bit Voltage Output SoftSpan DAC driver * * Copyright 2022 Analog Devices Inc. */ #include <linux/bitfield.h> #include <linux/bits.h> #include <linux/clk.h> #include <linux/device.h> #include <linux/gpio/consumer.h> #include <linux/iio/iio.h> #include <linux/limits.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/mutex.h> #include <linux/of.h> #include <linux/property.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/spi/spi.h> #define LTC2688_DAC_CHANNELS … #define LTC2688_CMD_CH_CODE(x) … #define LTC2688_CMD_CH_SETTING(x) … #define LTC2688_CMD_CH_OFFSET(x) … #define LTC2688_CMD_CH_GAIN(x) … #define LTC2688_CMD_CH_CODE_UPDATE(x) … #define LTC2688_CMD_CONFIG … #define LTC2688_CMD_POWERDOWN … #define LTC2688_CMD_A_B_SELECT … #define LTC2688_CMD_SW_TOGGLE … #define LTC2688_CMD_TOGGLE_DITHER_EN … #define LTC2688_CMD_THERMAL_STAT … #define LTC2688_CMD_UPDATE_ALL … #define LTC2688_CMD_NOOP … #define LTC2688_READ_OPERATION … /* Channel Settings */ #define LTC2688_CH_SPAN_MSK … #define LTC2688_CH_OVERRANGE_MSK … #define LTC2688_CH_TD_SEL_MSK … #define LTC2688_CH_TGP_MAX … #define LTC2688_CH_DIT_PER_MSK … #define LTC2688_CH_DIT_PH_MSK … #define LTC2688_CH_MODE_MSK … #define LTC2688_DITHER_RAW_MASK … #define LTC2688_CH_CALIBBIAS_MASK … #define LTC2688_DITHER_RAW_MAX_VAL … #define LTC2688_CH_CALIBBIAS_MAX_VAL … /* Configuration register */ #define LTC2688_CONFIG_RST … #define LTC2688_CONFIG_EXT_REF … #define LTC2688_DITHER_FREQ_AVAIL_N … enum { … }; enum { … }; struct ltc2688_chan { … }; struct ltc2688_state { … }; static int ltc2688_spi_read(void *context, const void *reg, size_t reg_size, void *val, size_t val_size) { … } static int ltc2688_spi_write(void *context, const void *data, size_t count) { … } static int ltc2688_span_get(const struct ltc2688_state *st, int c) { … } static const int ltc2688_span_helper[LTC2688_SPAN_RANGE_MAX][2] = …; static int ltc2688_scale_get(const struct ltc2688_state *st, int c, int *val) { … } static int ltc2688_offset_get(const struct ltc2688_state *st, int c, int *val) { … } enum { … }; static int ltc2688_dac_code_write(struct ltc2688_state *st, u32 chan, u32 input, u16 code) { … } static int ltc2688_dac_code_read(struct ltc2688_state *st, u32 chan, u32 input, u32 *code) { … } static const int ltc2688_raw_range[] = …; static int ltc2688_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, const int **vals, int *type, int *length, long info) { … } static int ltc2688_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long info) { … } static int ltc2688_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long info) { … } static ssize_t ltc2688_dither_toggle_set(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static ssize_t ltc2688_reg_bool_get(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ltc2688_reg_bool_set(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static ssize_t ltc2688_dither_freq_avail(const struct ltc2688_state *st, const struct ltc2688_chan *chan, char *buf) { … } static ssize_t ltc2688_dither_freq_get(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ltc2688_dither_freq_set(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static ssize_t ltc2688_dac_input_read(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ltc2688_dac_input_write(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static int ltc2688_get_dither_phase(struct iio_dev *dev, const struct iio_chan_spec *chan) { … } static int ltc2688_set_dither_phase(struct iio_dev *dev, const struct iio_chan_spec *chan, unsigned int phase) { … } static int ltc2688_reg_access(struct iio_dev *indio_dev, unsigned int reg, unsigned int writeval, unsigned int *readval) { … } static const char * const ltc2688_dither_phase[] = …; static const struct iio_enum ltc2688_dither_phase_enum = …; #define LTC2688_CHAN_EXT_INFO(_name, _what, _shared, _read, _write) … /* * For toggle mode we only expose the symbol attr (sw_toggle) in case a TGPx is * not provided in dts. */ static const struct iio_chan_spec_ext_info ltc2688_toggle_sym_ext_info[] = …; static const struct iio_chan_spec_ext_info ltc2688_toggle_ext_info[] = …; static struct iio_chan_spec_ext_info ltc2688_dither_ext_info[] = …; static const struct iio_chan_spec_ext_info ltc2688_ext_info[] = …; #define LTC2688_CHANNEL(_chan) … static const struct iio_chan_spec ltc2688_channels[] = …; static void ltc2688_clk_disable(void *clk) { … } static const int ltc2688_period[LTC2688_DITHER_FREQ_AVAIL_N] = …; static int ltc2688_tgp_clk_setup(struct ltc2688_state *st, struct ltc2688_chan *chan, struct fwnode_handle *node, int tgp) { … } static int ltc2688_span_lookup(const struct ltc2688_state *st, int min, int max) { … } static int ltc2688_channel_config(struct ltc2688_state *st) { … } static int ltc2688_setup(struct ltc2688_state *st, struct regulator *vref) { … } static void ltc2688_disable_regulator(void *regulator) { … } static bool ltc2688_reg_readable(struct device *dev, unsigned int reg) { … } static bool ltc2688_reg_writable(struct device *dev, unsigned int reg) { … } static const struct regmap_bus ltc2688_regmap_bus = …; static const struct regmap_config ltc2688_regmap_config = …; static const struct iio_info ltc2688_info = …; static int ltc2688_probe(struct spi_device *spi) { … } static const struct of_device_id ltc2688_of_id[] = …; MODULE_DEVICE_TABLE(of, ltc2688_of_id); static const struct spi_device_id ltc2688_id[] = …; MODULE_DEVICE_TABLE(spi, ltc2688_id); static struct spi_driver ltc2688_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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