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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * AD5592R 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/module.h>13#include <linux/mod_devicetable.h>14#include <linux/spi/spi.h>15 16#define AD5592R_GPIO_READBACK_EN BIT(10)17#define AD5592R_LDAC_READBACK_EN BIT(6)18 19static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, __be16 *buf)20{21 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);22 struct spi_transfer t = {23 .tx_buf = &st->spi_msg_nop,24 .rx_buf = buf,25 .len = 226 };27 28 st->spi_msg_nop = 0; /* NOP */29 30 return spi_sync_transfer(spi, &t, 1);31}32 33static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)34{35 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);36 37 st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value);38 39 return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));40}41 42static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)43{44 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);45 int ret;46 47 st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan));48 49 ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));50 if (ret)51 return ret;52 53 /*54 * Invalid data:55 * See Figure 40. Single-Channel ADC Conversion Sequence56 */57 ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);58 if (ret)59 return ret;60 61 ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);62 if (ret)63 return ret;64 65 *value = be16_to_cpu(st->spi_msg);66 67 return 0;68}69 70static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)71{72 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);73 74 st->spi_msg = cpu_to_be16((reg << 11) | value);75 76 return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));77}78 79static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)80{81 struct spi_device *spi = container_of(st->dev, struct spi_device, dev);82 int ret;83 84 st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) |85 AD5592R_LDAC_READBACK_EN | (reg << 2));86 87 ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));88 if (ret)89 return ret;90 91 ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);92 if (ret)93 return ret;94 95 *value = be16_to_cpu(st->spi_msg);96 97 return 0;98}99 100static int ad5592r_gpio_read(struct ad5592r_state *st, u8 *value)101{102 int ret;103 104 ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN,105 AD5592R_GPIO_READBACK_EN | st->gpio_in);106 if (ret)107 return ret;108 109 ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);110 if (ret)111 return ret;112 113 *value = (u8) be16_to_cpu(st->spi_msg);114 115 return 0;116}117 118static const struct ad5592r_rw_ops ad5592r_rw_ops = {119 .write_dac = ad5592r_write_dac,120 .read_adc = ad5592r_read_adc,121 .reg_write = ad5592r_reg_write,122 .reg_read = ad5592r_reg_read,123 .gpio_read = ad5592r_gpio_read,124};125 126static int ad5592r_spi_probe(struct spi_device *spi)127{128 const struct spi_device_id *id = spi_get_device_id(spi);129 130 return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops);131}132 133static void ad5592r_spi_remove(struct spi_device *spi)134{135 ad5592r_remove(&spi->dev);136}137 138static const struct spi_device_id ad5592r_spi_ids[] = {139 { .name = "ad5592r", },140 {}141};142MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids);143 144static const struct of_device_id ad5592r_of_match[] = {145 { .compatible = "adi,ad5592r", },146 {},147};148MODULE_DEVICE_TABLE(of, ad5592r_of_match);149 150static const struct acpi_device_id ad5592r_acpi_match[] = {151 {"ADS5592", },152 { },153};154MODULE_DEVICE_TABLE(acpi, ad5592r_acpi_match);155 156static struct spi_driver ad5592r_spi_driver = {157 .driver = {158 .name = "ad5592r",159 .of_match_table = ad5592r_of_match,160 .acpi_match_table = ad5592r_acpi_match,161 },162 .probe = ad5592r_spi_probe,163 .remove = ad5592r_spi_remove,164 .id_table = ad5592r_spi_ids,165};166module_spi_driver(ad5592r_spi_driver);167 168MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");169MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");170MODULE_LICENSE("GPL v2");171MODULE_IMPORT_NS(IIO_AD5592R);172