// SPDX-License-Identifier: GPL-2.0-only /* * AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog * Converter * * Copyright 2011 Analog Devices Inc. */ #include <linux/interrupt.h> #include <linux/fs.h> #include <linux/device.h> #include <linux/kernel.h> #include <linux/spi/spi.h> #include <linux/slab.h> #include <linux/sysfs.h> #include <linux/regulator/consumer.h> #include <linux/module.h> #include <linux/bitops.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/dac/ad5791.h> #define AD5791_DAC_MASK … #define AD5791_CMD_READ … #define AD5791_CMD_WRITE … #define AD5791_ADDR(addr) … /* Registers */ #define AD5791_ADDR_NOOP … #define AD5791_ADDR_DAC0 … #define AD5791_ADDR_CTRL … #define AD5791_ADDR_CLRCODE … #define AD5791_ADDR_SW_CTRL … /* Control Register */ #define AD5791_CTRL_RBUF … #define AD5791_CTRL_OPGND … #define AD5791_CTRL_DACTRI … #define AD5791_CTRL_BIN2SC … #define AD5791_CTRL_SDODIS … #define AD5761_CTRL_LINCOMP(x) … #define AD5791_LINCOMP_0_10 … #define AD5791_LINCOMP_10_12 … #define AD5791_LINCOMP_12_16 … #define AD5791_LINCOMP_16_19 … #define AD5791_LINCOMP_19_20 … #define AD5780_LINCOMP_0_10 … #define AD5780_LINCOMP_10_20 … /* Software Control Register */ #define AD5791_SWCTRL_LDAC … #define AD5791_SWCTRL_CLR … #define AD5791_SWCTRL_RESET … #define AD5791_DAC_PWRDN_6K … #define AD5791_DAC_PWRDN_3STATE … /** * struct ad5791_chip_info - chip specific information * @get_lin_comp: function pointer to the device specific function */ struct ad5791_chip_info { … }; /** * struct ad5791_state - driver instance specific data * @spi: spi_device * @reg_vdd: positive supply regulator * @reg_vss: negative supply regulator * @chip_info: chip model specific constants * @vref_mv: actual reference voltage used * @vref_neg_mv: voltage of the negative supply * @ctrl: control register cache * @pwr_down_mode: current power down mode * @pwr_down: true if device is powered down * @data: spi transfer buffers */ struct ad5791_state { … }; enum ad5791_supported_device_ids { … }; static int ad5791_spi_write(struct ad5791_state *st, u8 addr, u32 val) { … } static int ad5791_spi_read(struct ad5791_state *st, u8 addr, u32 *val) { … } static const char * const ad5791_powerdown_modes[] = …; static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { … } static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev, const struct iio_chan_spec *chan, unsigned int mode) { … } static const struct iio_enum ad5791_powerdown_mode_enum = …; static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, char *buf) { … } static ssize_t ad5791_write_dac_powerdown(struct iio_dev *indio_dev, uintptr_t private, const struct iio_chan_spec *chan, const char *buf, size_t len) { … } static int ad5791_get_lin_comp(unsigned int span) { … } static int ad5780_get_lin_comp(unsigned int span) { … } static const struct ad5791_chip_info ad5791_chip_info_tbl[] = …; static int ad5791_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long m) { struct ad5791_state *st = iio_priv(indio_dev); u64 val64; int ret; switch (m) { case IIO_CHAN_INFO_RAW: ret = ad5791_spi_read(st, chan->address, val); if (ret) return ret; *val &= AD5791_DAC_MASK; *val >>= chan->scan_type.shift; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = st->vref_mv; *val2 = (1 << chan->scan_type.realbits) - 1; return IIO_VAL_FRACTIONAL; case IIO_CHAN_INFO_OFFSET: val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits); do_div(val64, st->vref_mv); *val = -val64; return IIO_VAL_INT; default: return -EINVAL; } }; static const struct iio_chan_spec_ext_info ad5791_ext_info[] = …; #define AD5791_CHAN(bits, _shift) … static const struct iio_chan_spec ad5791_channels[] = …; static int ad5791_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static const struct iio_info ad5791_info = …; static int ad5791_probe(struct spi_device *spi) { … } static void ad5791_remove(struct spi_device *spi) { … } static const struct spi_device_id ad5791_id[] = …; MODULE_DEVICE_TABLE(spi, ad5791_id); static struct spi_driver ad5791_driver = …; module_spi_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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