| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver |
| * |
| * Copyright 2010-2011 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/iio/iio.h> |
| #include <linux/iio/sysfs.h> |
| |
| #include "ad5624r.h" |
| |
| static int ad5624r_spi_write(struct spi_device *spi, |
| u8 cmd, u8 addr, u16 val, u8 shift) |
| { |
| u32 data; |
| u8 msg[3]; |
| |
| /* |
| * The input shift register is 24 bits wide. The first two bits are |
| * don't care bits. The next three are the command bits, C2 to C0, |
| * followed by the 3-bit DAC address, A2 to A0, and then the |
| * 16-, 14-, 12-bit data-word. The data-word comprises the 16-, |
| * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits, |
| * for the AD5664R, AD5644R, and AD5624R, respectively. |
| */ |
| data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift); |
| msg[0] = data >> 16; |
| msg[1] = data >> 8; |
| msg[2] = data; |
| |
| return spi_write(spi, msg, 3); |
| } |
| |
| static int ad5624r_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, |
| int *val2, |
| long m) |
| { |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| switch (m) { |
| case IIO_CHAN_INFO_SCALE: |
| *val = st->vref_mv; |
| *val2 = chan->scan_type.realbits; |
| return IIO_VAL_FRACTIONAL_LOG2; |
| } |
| return -EINVAL; |
| } |
| |
| static int ad5624r_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, |
| int val2, |
| long mask) |
| { |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| switch (mask) { |
| case IIO_CHAN_INFO_RAW: |
| if (val >= (1 << chan->scan_type.realbits) || val < 0) |
| return -EINVAL; |
| |
| return ad5624r_spi_write(st->us, |
| AD5624R_CMD_WRITE_INPUT_N_UPDATE_N, |
| chan->address, val, |
| chan->scan_type.shift); |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const char * const ad5624r_powerdown_modes[] = { |
| "1kohm_to_gnd", |
| "100kohm_to_gnd", |
| "three_state" |
| }; |
| |
| static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan) |
| { |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| return st->pwr_down_mode; |
| } |
| |
| static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev, |
| const struct iio_chan_spec *chan, unsigned int mode) |
| { |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| st->pwr_down_mode = mode; |
| |
| return 0; |
| } |
| |
| static const struct iio_enum ad5624r_powerdown_mode_enum = { |
| .items = ad5624r_powerdown_modes, |
| .num_items = ARRAY_SIZE(ad5624r_powerdown_modes), |
| .get = ad5624r_get_powerdown_mode, |
| .set = ad5624r_set_powerdown_mode, |
| }; |
| |
| static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev, |
| uintptr_t private, const struct iio_chan_spec *chan, char *buf) |
| { |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", |
| !!(st->pwr_down_mask & (1 << chan->channel))); |
| } |
| |
| static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev, |
| uintptr_t private, const struct iio_chan_spec *chan, const char *buf, |
| size_t len) |
| { |
| bool pwr_down; |
| int ret; |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| ret = strtobool(buf, &pwr_down); |
| if (ret) |
| return ret; |
| |
| if (pwr_down) |
| st->pwr_down_mask |= (1 << chan->channel); |
| else |
| st->pwr_down_mask &= ~(1 << chan->channel); |
| |
| ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0, |
| (st->pwr_down_mode << 4) | |
| st->pwr_down_mask, 16); |
| |
| return ret ? ret : len; |
| } |
| |
| static const struct iio_info ad5624r_info = { |
| .write_raw = ad5624r_write_raw, |
| .read_raw = ad5624r_read_raw, |
| }; |
| |
| static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = { |
| { |
| .name = "powerdown", |
| .read = ad5624r_read_dac_powerdown, |
| .write = ad5624r_write_dac_powerdown, |
| .shared = IIO_SEPARATE, |
| }, |
| IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, |
| &ad5624r_powerdown_mode_enum), |
| IIO_ENUM_AVAILABLE("powerdown_mode", &ad5624r_powerdown_mode_enum), |
| { }, |
| }; |
| |
| #define AD5624R_CHANNEL(_chan, _bits) { \ |
| .type = IIO_VOLTAGE, \ |
| .indexed = 1, \ |
| .output = 1, \ |
| .channel = (_chan), \ |
| .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
| .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
| .address = (_chan), \ |
| .scan_type = { \ |
| .sign = 'u', \ |
| .realbits = (_bits), \ |
| .storagebits = 16, \ |
| .shift = 16 - (_bits), \ |
| }, \ |
| .ext_info = ad5624r_ext_info, \ |
| } |
| |
| #define DECLARE_AD5624R_CHANNELS(_name, _bits) \ |
| const struct iio_chan_spec _name##_channels[] = { \ |
| AD5624R_CHANNEL(0, _bits), \ |
| AD5624R_CHANNEL(1, _bits), \ |
| AD5624R_CHANNEL(2, _bits), \ |
| AD5624R_CHANNEL(3, _bits), \ |
| } |
| |
| static DECLARE_AD5624R_CHANNELS(ad5624r, 12); |
| static DECLARE_AD5624R_CHANNELS(ad5644r, 14); |
| static DECLARE_AD5624R_CHANNELS(ad5664r, 16); |
| |
| static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = { |
| [ID_AD5624R3] = { |
| .channels = ad5624r_channels, |
| .int_vref_mv = 1250, |
| }, |
| [ID_AD5624R5] = { |
| .channels = ad5624r_channels, |
| .int_vref_mv = 2500, |
| }, |
| [ID_AD5644R3] = { |
| .channels = ad5644r_channels, |
| .int_vref_mv = 1250, |
| }, |
| [ID_AD5644R5] = { |
| .channels = ad5644r_channels, |
| .int_vref_mv = 2500, |
| }, |
| [ID_AD5664R3] = { |
| .channels = ad5664r_channels, |
| .int_vref_mv = 1250, |
| }, |
| [ID_AD5664R5] = { |
| .channels = ad5664r_channels, |
| .int_vref_mv = 2500, |
| }, |
| }; |
| |
| static int ad5624r_probe(struct spi_device *spi) |
| { |
| struct ad5624r_state *st; |
| struct iio_dev *indio_dev; |
| int ret, voltage_uv = 0; |
| |
| indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); |
| if (!indio_dev) |
| return -ENOMEM; |
| st = iio_priv(indio_dev); |
| st->reg = devm_regulator_get(&spi->dev, "vcc"); |
| if (!IS_ERR(st->reg)) { |
| ret = regulator_enable(st->reg); |
| if (ret) |
| return ret; |
| |
| ret = regulator_get_voltage(st->reg); |
| if (ret < 0) |
| goto error_disable_reg; |
| |
| voltage_uv = ret; |
| } |
| |
| spi_set_drvdata(spi, indio_dev); |
| st->chip_info = |
| &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data]; |
| |
| if (voltage_uv) |
| st->vref_mv = voltage_uv / 1000; |
| else |
| st->vref_mv = st->chip_info->int_vref_mv; |
| |
| st->us = spi; |
| |
| indio_dev->dev.parent = &spi->dev; |
| indio_dev->name = spi_get_device_id(spi)->name; |
| indio_dev->info = &ad5624r_info; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = st->chip_info->channels; |
| indio_dev->num_channels = AD5624R_DAC_CHANNELS; |
| |
| ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0, |
| !!voltage_uv, 16); |
| if (ret) |
| goto error_disable_reg; |
| |
| ret = iio_device_register(indio_dev); |
| if (ret) |
| goto error_disable_reg; |
| |
| return 0; |
| |
| error_disable_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| |
| return ret; |
| } |
| |
| static int ad5624r_remove(struct spi_device *spi) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| struct ad5624r_state *st = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| |
| return 0; |
| } |
| |
| static const struct spi_device_id ad5624r_id[] = { |
| {"ad5624r3", ID_AD5624R3}, |
| {"ad5644r3", ID_AD5644R3}, |
| {"ad5664r3", ID_AD5664R3}, |
| {"ad5624r5", ID_AD5624R5}, |
| {"ad5644r5", ID_AD5644R5}, |
| {"ad5664r5", ID_AD5664R5}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(spi, ad5624r_id); |
| |
| static struct spi_driver ad5624r_driver = { |
| .driver = { |
| .name = "ad5624r", |
| }, |
| .probe = ad5624r_probe, |
| .remove = ad5624r_remove, |
| .id_table = ad5624r_id, |
| }; |
| module_spi_driver(ad5624r_driver); |
| |
| MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>"); |
| MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver"); |
| MODULE_LICENSE("GPL v2"); |