linux-imx

/*

 * Driver for the Analog Devices digital potentiometers (I2C bus)

 *

 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.

 *

 * Licensed under the GPL-2 or later.

 */

​

#include <linux/i2c.h>

#include <linux/module.h>

​

#include "ad525x_dpot.h"

​

/* I2C bus functions */

static int write_d8(void *client, u8 val)

{

    return i2c_smbus_write_byte(client, val);

}

​

static int write_r8d8(void *client, u8 reg, u8 val)

{

    return i2c_smbus_write_byte_data(client, reg, val);

}

​

static int write_r8d16(void *client, u8 reg, u16 val)

{

    return i2c_smbus_write_word_data(client, reg, val);

}

​

static int read_d8(void *client)

{

    return i2c_smbus_read_byte(client);

}

​

static int read_r8d8(void *client, u8 reg)

{

    return i2c_smbus_read_byte_data(client, reg);

}

​

static int read_r8d16(void *client, u8 reg)

{

    return i2c_smbus_read_word_data(client, reg);

}

​

static const struct ad_dpot_bus_ops bops = {

    .read_d8    = read_d8,

    .read_r8d8  = read_r8d8,

    .read_r8d16 = read_r8d16,

    .write_d8   = write_d8,

    .write_r8d8 = write_r8d8,

    .write_r8d16    = write_r8d16,

};

​

static int ad_dpot_i2c_probe(struct i2c_client *client,

                      const struct i2c_device_id *id)

{

    struct ad_dpot_bus_data bdata = {

        .client = client,

        .bops = &bops,

    };

​

    if (!i2c_check_functionality(client->adapter,

                     I2C_FUNC_SMBUS_WORD_DATA)) {