1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * AD5593R Digital <-> Analog converters driver
  4 *
  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#define AD5593R_MODE_CONF		(0 << 4)
 17#define AD5593R_MODE_DAC_WRITE		(1 << 4)
 18#define AD5593R_MODE_ADC_READBACK	(4 << 4)
 19#define AD5593R_MODE_DAC_READBACK	(5 << 4)
 20#define AD5593R_MODE_GPIO_READBACK	(6 << 4)
 21#define AD5593R_MODE_REG_READBACK	(7 << 4)
 22
 23static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
 24{
 25	struct i2c_client *i2c = to_i2c_client(st->dev);
 26
 27	return i2c_smbus_write_word_swapped(i2c,
 28			AD5593R_MODE_DAC_WRITE | chan, value);
 29}
 30
 31static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
 32{
 33	struct i2c_client *i2c = to_i2c_client(st->dev);
 34	s32 val;
 35
 36	val = i2c_smbus_write_word_swapped(i2c,
 37			AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
 38	if (val < 0)
 39		return (int) val;
 40
 41	val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK);
 42	if (val < 0)
 43		return (int) val;
 44
 45	*value = (u16) val;
 46
 47	return 0;
 48}
 49
 50static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
 51{
 52	struct i2c_client *i2c = to_i2c_client(st->dev);
 53
 54	return i2c_smbus_write_word_swapped(i2c,
 55			AD5593R_MODE_CONF | reg, value);
 56}
 57
 58static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
 59{
 60	struct i2c_client *i2c = to_i2c_client(st->dev);
 61	s32 val;
 62
 63	val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg);
 64	if (val < 0)
 65		return (int) val;
 66
 67	*value = (u16) val;
 68
 69	return 0;
 70}
 71
 72static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
 73{
 74	struct i2c_client *i2c = to_i2c_client(st->dev);
 75	s32 val;
 76
 77	val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK);
 78	if (val < 0)
 79		return (int) val;
 80
 81	*value = (u8) val;
 82
 83	return 0;
 84}
 85
 86static const struct ad5592r_rw_ops ad5593r_rw_ops = {
 87	.write_dac = ad5593r_write_dac,
 88	.read_adc = ad5593r_read_adc,
 89	.reg_write = ad5593r_reg_write,
 90	.reg_read = ad5593r_reg_read,
 91	.gpio_read = ad5593r_gpio_read,
 92};
 93
 94static int ad5593r_i2c_probe(struct i2c_client *i2c,
 95		const struct i2c_device_id *id)
 96{
 97	return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
 98}
 99
100static int ad5593r_i2c_remove(struct i2c_client *i2c)
101{
102	return ad5592r_remove(&i2c->dev);
103}
104
105static const struct i2c_device_id ad5593r_i2c_ids[] = {
106	{ .name = "ad5593r", },
107	{},
108};
109MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
110
111static const struct of_device_id ad5593r_of_match[] = {
112	{ .compatible = "adi,ad5593r", },
113	{},
114};
115MODULE_DEVICE_TABLE(of, ad5593r_of_match);
116
117static const struct acpi_device_id ad5593r_acpi_match[] = {
118	{"ADS5593", },
119	{ },
120};
121MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
122
123static struct i2c_driver ad5593r_driver = {
124	.driver = {
125		.name = "ad5593r",
126		.of_match_table = ad5593r_of_match,
127		.acpi_match_table = ad5593r_acpi_match,
128	},
129	.probe = ad5593r_i2c_probe,
130	.remove = ad5593r_i2c_remove,
131	.id_table = ad5593r_i2c_ids,
132};
133module_i2c_driver(ad5593r_driver);
134
135MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
136MODULE_DESCRIPTION("Analog Devices AD5593R multi-channel converters");
137MODULE_LICENSE("GPL v2");