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/*
* AD5593R Digital <-> Analog converters driver
*
* Copyright 2015-2016 Analog Devices Inc.
* Author: Paul Cercueil <paul.cercueil@analog.com>
*
* Licensed under the GPL-2.
*/
#include "ad5592r-base.h"
#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/acpi.h>
#include <asm/unaligned.h>
#define AD5593R_MODE_CONF (0 << 4)
#define AD5593R_MODE_DAC_WRITE (1 << 4)
#define AD5593R_MODE_ADC_READBACK (4 << 4)
#define AD5593R_MODE_DAC_READBACK (5 << 4)
#define AD5593R_MODE_GPIO_READBACK (6 << 4)
#define AD5593R_MODE_REG_READBACK (7 << 4)
static int ad5593r_read_word(struct i2c_client *i2c, u8 reg, u16 *value)
{
int ret;
u8 buf[2];
ret = i2c_smbus_write_byte(i2c, reg);
if (ret < 0)
return ret;
ret = i2c_master_recv(i2c, buf, sizeof(buf));
if (ret < 0)
return ret;
*value = get_unaligned_be16(buf);
return 0;
}
static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
{
struct i2c_client *i2c = to_i2c_client(st->dev);
return i2c_smbus_write_word_swapped(i2c,
AD5593R_MODE_DAC_WRITE | chan, value);
}
static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
{
struct i2c_client *i2c = to_i2c_client(st->dev);
s32 val;
val = i2c_smbus_write_word_swapped(i2c,
AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
if (val < 0)
return (int) val;
return ad5593r_read_word(i2c, AD5593R_MODE_ADC_READBACK, value);
}
static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
{
struct i2c_client *i2c = to_i2c_client(st->dev);
return i2c_smbus_write_word_swapped(i2c,
AD5593R_MODE_CONF | reg, value);
}
static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
{
struct i2c_client *i2c = to_i2c_client(st->dev);
return ad5593r_read_word(i2c, AD5593R_MODE_REG_READBACK | reg, value);
}
static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
{
struct i2c_client *i2c = to_i2c_client(st->dev);
u16 val;
int ret;
ret = ad5593r_read_word(i2c, AD5593R_MODE_GPIO_READBACK, &val);
if (ret)
return ret;
*value = (u8) val;
return 0;
}
static const struct ad5592r_rw_ops ad5593r_rw_ops = {
.write_dac = ad5593r_write_dac,
.read_adc = ad5593r_read_adc,
.reg_write = ad5593r_reg_write,
.reg_read = ad5593r_reg_read,
.gpio_read = ad5593r_gpio_read,
};
static int ad5593r_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
}
static int ad5593r_i2c_remove(struct i2c_client *i2c)
{
return ad5592r_remove(&i2c->dev);
}
static const struct i2c_device_id ad5593r_i2c_ids[] = {
{ .name = "ad5593r", },
{},
};
MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
static const struct of_device_id ad5593r_of_match[] = {
{ .compatible = "adi,ad5593r", },
{},
};
MODULE_DEVICE_TABLE(of, ad5593r_of_match);
static const struct acpi_device_id ad5593r_acpi_match[] = {
{"ADS5593", },
{ },
};
MODULE_DEVICE_TABLE(acpi, ad5593r_acpi_match);
static struct i2c_driver ad5593r_driver = {
.driver = {
.name = "ad5593r",
.of_match_table = of_match_ptr(ad5593r_of_match),
.acpi_match_table = ACPI_PTR(ad5593r_acpi_match),
},
.probe = ad5593r_i2c_probe,
.remove = ad5593r_i2c_remove,
.id_table = ad5593r_i2c_ids,
};
module_i2c_driver(ad5593r_driver);
MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
MODULE_LICENSE("GPL v2");
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