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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AD5593R Digital <-> Analog converters driver4 *5 * Copyright 2015-2016 Analog Devices Inc.6 * Author: Paul Cercueil <paul.cercueil@analog.com>7 */8 9#include "ad5592r-base.h"10 11#include <linux/bitops.h>12#include <linux/i2c.h>13#include <linux/module.h>14#include <linux/mod_devicetable.h>15 16#include <linux/unaligned.h>17 18#define AD5593R_MODE_CONF (0 << 4)19#define AD5593R_MODE_DAC_WRITE (1 << 4)20#define AD5593R_MODE_ADC_READBACK (4 << 4)21#define AD5593R_MODE_DAC_READBACK (5 << 4)22#define AD5593R_MODE_GPIO_READBACK (6 << 4)23#define AD5593R_MODE_REG_READBACK (7 << 4)24 25static int ad5593r_read_word(struct i2c_client *i2c, u8 reg, u16 *value)26{27 int ret;28 u8 buf[2];29 30 ret = i2c_smbus_write_byte(i2c, reg);31 if (ret < 0)32 return ret;33 34 ret = i2c_master_recv(i2c, buf, sizeof(buf));35 if (ret < 0)36 return ret;37 38 *value = get_unaligned_be16(buf);39 40 return 0;41}42 43static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)44{45 struct i2c_client *i2c = to_i2c_client(st->dev);46 47 return i2c_smbus_write_word_swapped(i2c,48 AD5593R_MODE_DAC_WRITE | chan, value);49}50 51static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)52{53 struct i2c_client *i2c = to_i2c_client(st->dev);54 s32 val;55 56 val = i2c_smbus_write_word_swapped(i2c,57 AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));58 if (val < 0)59 return (int) val;60 61 return ad5593r_read_word(i2c, AD5593R_MODE_ADC_READBACK, value);62}63 64static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)65{66 struct i2c_client *i2c = to_i2c_client(st->dev);67 68 return i2c_smbus_write_word_swapped(i2c,69 AD5593R_MODE_CONF | reg, value);70}71 72static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)73{74 struct i2c_client *i2c = to_i2c_client(st->dev);75 76 return ad5593r_read_word(i2c, AD5593R_MODE_REG_READBACK | reg, value);77}78 79static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)80{81 struct i2c_client *i2c = to_i2c_client(st->dev);82 u16 val;83 int ret;84 85 ret = ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, &val);86 if (ret)87 return ret;88 89 *value = (u8) val;90 91 return 0;92}93 94static const struct ad5592r_rw_ops ad5593r_rw_ops = {95 .write_dac = ad5593r_write_dac,96 .read_adc = ad5593r_read_adc,97 .reg_write = ad5593r_reg_write,98 .reg_read = ad5593r_reg_read,99 .gpio_read = ad5593r_gpio_read,100};101 102static int ad5593r_i2c_probe(struct i2c_client *i2c)103{104 const struct i2c_device_id *id = i2c_client_get_device_id(i2c);105 if (!i2c_check_functionality(i2c->adapter,106 I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))107 return -EOPNOTSUPP;108 109 return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);110}111 112static void ad5593r_i2c_remove(struct i2c_client *i2c)113{114 ad5592r_remove(&i2c->dev);115}116 117static const struct i2c_device_id ad5593r_i2c_ids[] = {118 { .name = "ad5593r", },119 {},120};121MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);122 123static const struct of_device_id ad5593r_of_match[] = {124 { .compatible = "adi,ad5593r", },125 {},126};127MODULE_DEVICE_TABLE(of, ad5593r_of_match);128 129static const struct acpi_device_id ad5593r_acpi_match[] = {130 {"ADS5593", },131 { },132};133MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);134 135static struct i2c_driver ad5593r_driver = {136 .driver = {137 .name = "ad5593r",138 .of_match_table = ad5593r_of_match,139 .acpi_match_table = ad5593r_acpi_match,140 },141 .probe = ad5593r_i2c_probe,142 .remove = ad5593r_i2c_remove,143 .id_table = ad5593r_i2c_ids,144};145module_i2c_driver(ad5593r_driver);146 147MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");148MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters");149MODULE_LICENSE("GPL v2");150MODULE_IMPORT_NS(IIO_AD5592R);151