linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R,

 * AD5694, AD5694R, AD5695R, AD5696, AD5696R

 * Digital to analog converters driver

 *

 * Copyright 2018 Analog Devices Inc.

 */

​

#include "ad5686.h"

​

#include <linux/module.h>

#include <linux/i2c.h>

​

static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)

{

    struct i2c_client *i2c = to_i2c_client(st->dev);

    struct i2c_msg msg[2] = {

        {

            .addr = i2c->addr,

            .flags = i2c->flags,

            .len = 3,

            .buf = &st->data[0].d8[1],

        },

        {

            .addr = i2c->addr,

            .flags = i2c->flags | I2C_M_RD,

            .len = 2,

            .buf = (char *)&st->data[0].d16,

        },

    };

    int ret;

​

    st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |

                      AD5686_ADDR(addr) |

                      0x00);

​

    ret = i2c_transfer(i2c->adapter, msg, 2);

    if (ret < 0)

        return ret;

​

    return be16_to_cpu(st->data[0].d16);

}

​

static int ad5686_i2c_write(struct ad5686_state *st,

                u8 cmd, u8 addr, u16 val)

{

    struct i2c_client *i2c = to_i2c_client(st->dev);

    int ret;

​

    st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)

                      | val);

​

    ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);

    if (ret < 0)

        return ret;

​

    return (ret != 3) ? -EIO : 0;

}

​

static int ad5686_i2c_probe(struct i2c_client *i2c,

                const struct i2c_device_id *id)

{