// SPDX-License-Identifier: GPL-2.0-only
/*
 * AD5593R Digital <-> Analog converters driver
 *
 * Copyright 2015-2016 Analog Devices Inc.
 * Author: Paul Cercueil <paul.cercueil@analog.com>
 */

#include "ad5592r-base.h"

#include <linux/bitops.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>

#include <linux/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 = i2c_client_get_device_id(i2c);
        if (!i2c_check_functionality(i2c->adapter,
                                     I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
                return -EOPNOTSUPP;

        return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
}

static void ad5593r_i2c_remove(struct i2c_client *i2c)
{
        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 = ad5593r_of_match,
                .acpi_match_table = 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 AD5593R multi-channel converters");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS("IIO_AD5592R");