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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AD5624R, AD5644R, AD5664R Digital to analog convertors spi driver4 *5 * Copyright 2010-2011 Analog Devices Inc.6 */7 8#include <linux/interrupt.h>9#include <linux/fs.h>10#include <linux/device.h>11#include <linux/kernel.h>12#include <linux/spi/spi.h>13#include <linux/slab.h>14#include <linux/sysfs.h>15#include <linux/regulator/consumer.h>16#include <linux/module.h>17 18#include <linux/iio/iio.h>19#include <linux/iio/sysfs.h>20 21#include <linux/unaligned.h>22 23#include "ad5624r.h"24 25static int ad5624r_spi_write(struct spi_device *spi,26 u8 cmd, u8 addr, u16 val, u8 shift)27{28 u32 data;29 u8 msg[3];30 31 /*32 * The input shift register is 24 bits wide. The first two bits are33 * don't care bits. The next three are the command bits, C2 to C0,34 * followed by the 3-bit DAC address, A2 to A0, and then the35 * 16-, 14-, 12-bit data-word. The data-word comprises the 16-,36 * 14-, 12-bit input code followed by 0, 2, or 4 don't care bits,37 * for the AD5664R, AD5644R, and AD5624R, respectively.38 */39 data = (0 << 22) | (cmd << 19) | (addr << 16) | (val << shift);40 put_unaligned_be24(data, &msg[0]);41 42 return spi_write(spi, msg, sizeof(msg));43}44 45static int ad5624r_read_raw(struct iio_dev *indio_dev,46 struct iio_chan_spec const *chan,47 int *val,48 int *val2,49 long m)50{51 struct ad5624r_state *st = iio_priv(indio_dev);52 53 switch (m) {54 case IIO_CHAN_INFO_SCALE:55 *val = st->vref_mv;56 *val2 = chan->scan_type.realbits;57 return IIO_VAL_FRACTIONAL_LOG2;58 }59 return -EINVAL;60}61 62static int ad5624r_write_raw(struct iio_dev *indio_dev,63 struct iio_chan_spec const *chan,64 int val,65 int val2,66 long mask)67{68 struct ad5624r_state *st = iio_priv(indio_dev);69 70 switch (mask) {71 case IIO_CHAN_INFO_RAW:72 if (val >= (1 << chan->scan_type.realbits) || val < 0)73 return -EINVAL;74 75 return ad5624r_spi_write(st->us,76 AD5624R_CMD_WRITE_INPUT_N_UPDATE_N,77 chan->address, val,78 chan->scan_type.shift);79 default:80 return -EINVAL;81 }82}83 84static const char * const ad5624r_powerdown_modes[] = {85 "1kohm_to_gnd",86 "100kohm_to_gnd",87 "three_state"88};89 90static int ad5624r_get_powerdown_mode(struct iio_dev *indio_dev,91 const struct iio_chan_spec *chan)92{93 struct ad5624r_state *st = iio_priv(indio_dev);94 95 return st->pwr_down_mode;96}97 98static int ad5624r_set_powerdown_mode(struct iio_dev *indio_dev,99 const struct iio_chan_spec *chan, unsigned int mode)100{101 struct ad5624r_state *st = iio_priv(indio_dev);102 103 st->pwr_down_mode = mode;104 105 return 0;106}107 108static const struct iio_enum ad5624r_powerdown_mode_enum = {109 .items = ad5624r_powerdown_modes,110 .num_items = ARRAY_SIZE(ad5624r_powerdown_modes),111 .get = ad5624r_get_powerdown_mode,112 .set = ad5624r_set_powerdown_mode,113};114 115static ssize_t ad5624r_read_dac_powerdown(struct iio_dev *indio_dev,116 uintptr_t private, const struct iio_chan_spec *chan, char *buf)117{118 struct ad5624r_state *st = iio_priv(indio_dev);119 120 return sysfs_emit(buf, "%d\n",121 !!(st->pwr_down_mask & (1 << chan->channel)));122}123 124static ssize_t ad5624r_write_dac_powerdown(struct iio_dev *indio_dev,125 uintptr_t private, const struct iio_chan_spec *chan, const char *buf,126 size_t len)127{128 bool pwr_down;129 int ret;130 struct ad5624r_state *st = iio_priv(indio_dev);131 132 ret = kstrtobool(buf, &pwr_down);133 if (ret)134 return ret;135 136 if (pwr_down)137 st->pwr_down_mask |= (1 << chan->channel);138 else139 st->pwr_down_mask &= ~(1 << chan->channel);140 141 ret = ad5624r_spi_write(st->us, AD5624R_CMD_POWERDOWN_DAC, 0,142 (st->pwr_down_mode << 4) |143 st->pwr_down_mask, 16);144 145 return ret ? ret : len;146}147 148static const struct iio_info ad5624r_info = {149 .write_raw = ad5624r_write_raw,150 .read_raw = ad5624r_read_raw,151};152 153static const struct iio_chan_spec_ext_info ad5624r_ext_info[] = {154 {155 .name = "powerdown",156 .read = ad5624r_read_dac_powerdown,157 .write = ad5624r_write_dac_powerdown,158 .shared = IIO_SEPARATE,159 },160 IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,161 &ad5624r_powerdown_mode_enum),162 IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &ad5624r_powerdown_mode_enum),163 { },164};165 166#define AD5624R_CHANNEL(_chan, _bits) { \167 .type = IIO_VOLTAGE, \168 .indexed = 1, \169 .output = 1, \170 .channel = (_chan), \171 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \172 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \173 .address = (_chan), \174 .scan_type = { \175 .sign = 'u', \176 .realbits = (_bits), \177 .storagebits = 16, \178 .shift = 16 - (_bits), \179 }, \180 .ext_info = ad5624r_ext_info, \181}182 183#define DECLARE_AD5624R_CHANNELS(_name, _bits) \184 const struct iio_chan_spec _name##_channels[] = { \185 AD5624R_CHANNEL(0, _bits), \186 AD5624R_CHANNEL(1, _bits), \187 AD5624R_CHANNEL(2, _bits), \188 AD5624R_CHANNEL(3, _bits), \189}190 191static DECLARE_AD5624R_CHANNELS(ad5624r, 12);192static DECLARE_AD5624R_CHANNELS(ad5644r, 14);193static DECLARE_AD5624R_CHANNELS(ad5664r, 16);194 195static const struct ad5624r_chip_info ad5624r_chip_info_tbl[] = {196 [ID_AD5624R3] = {197 .channels = ad5624r_channels,198 .int_vref_mv = 1250,199 },200 [ID_AD5624R5] = {201 .channels = ad5624r_channels,202 .int_vref_mv = 2500,203 },204 [ID_AD5644R3] = {205 .channels = ad5644r_channels,206 .int_vref_mv = 1250,207 },208 [ID_AD5644R5] = {209 .channels = ad5644r_channels,210 .int_vref_mv = 2500,211 },212 [ID_AD5664R3] = {213 .channels = ad5664r_channels,214 .int_vref_mv = 1250,215 },216 [ID_AD5664R5] = {217 .channels = ad5664r_channels,218 .int_vref_mv = 2500,219 },220};221 222static int ad5624r_probe(struct spi_device *spi)223{224 struct ad5624r_state *st;225 struct iio_dev *indio_dev;226 int ret, voltage_uv = 0;227 228 indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));229 if (!indio_dev)230 return -ENOMEM;231 st = iio_priv(indio_dev);232 st->reg = devm_regulator_get_optional(&spi->dev, "vref");233 if (!IS_ERR(st->reg)) {234 ret = regulator_enable(st->reg);235 if (ret)236 return ret;237 238 ret = regulator_get_voltage(st->reg);239 if (ret < 0)240 goto error_disable_reg;241 242 voltage_uv = ret;243 } else {244 if (PTR_ERR(st->reg) != -ENODEV)245 return PTR_ERR(st->reg);246 /* Backwards compatibility. This naming is not correct */247 st->reg = devm_regulator_get_optional(&spi->dev, "vcc");248 if (!IS_ERR(st->reg)) {249 ret = regulator_enable(st->reg);250 if (ret)251 return ret;252 253 ret = regulator_get_voltage(st->reg);254 if (ret < 0)255 goto error_disable_reg;256 257 voltage_uv = ret;258 }259 }260 261 spi_set_drvdata(spi, indio_dev);262 st->chip_info =263 &ad5624r_chip_info_tbl[spi_get_device_id(spi)->driver_data];264 265 if (voltage_uv)266 st->vref_mv = voltage_uv / 1000;267 else268 st->vref_mv = st->chip_info->int_vref_mv;269 270 st->us = spi;271 272 indio_dev->name = spi_get_device_id(spi)->name;273 indio_dev->info = &ad5624r_info;274 indio_dev->modes = INDIO_DIRECT_MODE;275 indio_dev->channels = st->chip_info->channels;276 indio_dev->num_channels = AD5624R_DAC_CHANNELS;277 278 ret = ad5624r_spi_write(spi, AD5624R_CMD_INTERNAL_REFER_SETUP, 0,279 !!voltage_uv, 16);280 if (ret)281 goto error_disable_reg;282 283 ret = iio_device_register(indio_dev);284 if (ret)285 goto error_disable_reg;286 287 return 0;288 289error_disable_reg:290 if (!IS_ERR(st->reg))291 regulator_disable(st->reg);292 293 return ret;294}295 296static void ad5624r_remove(struct spi_device *spi)297{298 struct iio_dev *indio_dev = spi_get_drvdata(spi);299 struct ad5624r_state *st = iio_priv(indio_dev);300 301 iio_device_unregister(indio_dev);302 if (!IS_ERR(st->reg))303 regulator_disable(st->reg);304}305 306static const struct spi_device_id ad5624r_id[] = {307 {"ad5624r3", ID_AD5624R3},308 {"ad5644r3", ID_AD5644R3},309 {"ad5664r3", ID_AD5664R3},310 {"ad5624r5", ID_AD5624R5},311 {"ad5644r5", ID_AD5644R5},312 {"ad5664r5", ID_AD5664R5},313 {}314};315MODULE_DEVICE_TABLE(spi, ad5624r_id);316 317static struct spi_driver ad5624r_driver = {318 .driver = {319 .name = "ad5624r",320 },321 .probe = ad5624r_probe,322 .remove = ad5624r_remove,323 .id_table = ad5624r_id,324};325module_spi_driver(ad5624r_driver);326 327MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");328MODULE_DESCRIPTION("Analog Devices AD5624/44/64R DAC spi driver");329MODULE_LICENSE("GPL v2");330