ade7854-i2c.c

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/*
 * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (I2C Bus)
 *
 * Copyright 2010 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/module.h>

#include <linux/iio/iio.h>
#include "ade7854.h"

static int ade7854_i2c_write_reg_8(struct device *dev,
        u16 reg_address,
        u8 value)
{
    int ret;
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;
    st->tx[2] = value;

    ret = i2c_master_send(st->i2c, st->tx, 3);
    mutex_unlock(&st->buf_lock);

    return ret;
}

static int ade7854_i2c_write_reg_16(struct device *dev,
        u16 reg_address,
        u16 value)
{
    int ret;
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;
    st->tx[2] = (value >> 8) & 0xFF;
    st->tx[3] = value & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 4);
    mutex_unlock(&st->buf_lock);

    return ret;
}

static int ade7854_i2c_write_reg_24(struct device *dev,
        u16 reg_address,
        u32 value)
{
    int ret;
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;
    st->tx[2] = (value >> 16) & 0xFF;
    st->tx[3] = (value >> 8) & 0xFF;
    st->tx[4] = value & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 5);
    mutex_unlock(&st->buf_lock);

    return ret;
}

static int ade7854_i2c_write_reg_32(struct device *dev,
        u16 reg_address,
        u32 value)
{
    int ret;
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;
    st->tx[2] = (value >> 24) & 0xFF;
    st->tx[3] = (value >> 16) & 0xFF;
    st->tx[4] = (value >> 8) & 0xFF;
    st->tx[5] = value & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 6);
    mutex_unlock(&st->buf_lock);

    return ret;
}

static int ade7854_i2c_read_reg_8(struct device *dev,
        u16 reg_address,
        u8 *val)
{
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);
    int ret;

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 2);
    if (ret)
        goto out;

    ret = i2c_master_recv(st->i2c, st->rx, 1);
    if (ret)
        goto out;

    *val = st->rx[0];
out:
    mutex_unlock(&st->buf_lock);
    return ret;
}

static int ade7854_i2c_read_reg_16(struct device *dev,
        u16 reg_address,
        u16 *val)
{
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);
    int ret;

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 2);
    if (ret)
        goto out;

    ret = i2c_master_recv(st->i2c, st->rx, 2);
    if (ret)
        goto out;

    *val = (st->rx[0] << 8) | st->rx[1];
out:
    mutex_unlock(&st->buf_lock);
    return ret;
}

static int ade7854_i2c_read_reg_24(struct device *dev,
        u16 reg_address,
        u32 *val)
{
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);
    int ret;

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 2);
    if (ret)
        goto out;

    ret = i2c_master_recv(st->i2c, st->rx, 3);
    if (ret)
        goto out;

    *val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
out:
    mutex_unlock(&st->buf_lock);
    return ret;
}

static int ade7854_i2c_read_reg_32(struct device *dev,
        u16 reg_address,
        u32 *val)
{
    struct iio_dev *indio_dev = dev_to_iio_dev(dev);
    struct ade7854_state *st = iio_priv(indio_dev);
    int ret;

    mutex_lock(&st->buf_lock);
    st->tx[0] = (reg_address >> 8) & 0xFF;
    st->tx[1] = reg_address & 0xFF;

    ret = i2c_master_send(st->i2c, st->tx, 2);
    if (ret)
        goto out;

    ret = i2c_master_recv(st->i2c, st->rx, 3);
    if (ret)
        goto out;

    *val = (st->rx[0] << 24) | (st->rx[1] << 16) | (st->rx[2] << 8) | st->rx[3];
out:
    mutex_unlock(&st->buf_lock);
    return ret;
}

static int __devinit ade7854_i2c_probe(struct i2c_client *client,
        const struct i2c_device_id *id)
{
    int ret;
    struct ade7854_state *st;
    struct iio_dev *indio_dev;

    indio_dev = iio_device_alloc(sizeof(*st));
    if (indio_dev == NULL)
        return -ENOMEM;
    st = iio_priv(indio_dev);
    i2c_set_clientdata(client, indio_dev);
    st->read_reg_8 = ade7854_i2c_read_reg_8;
    st->read_reg_16 = ade7854_i2c_read_reg_16;
    st->read_reg_24 = ade7854_i2c_read_reg_24;
    st->read_reg_32 = ade7854_i2c_read_reg_32;
    st->write_reg_8 = ade7854_i2c_write_reg_8;
    st->write_reg_16 = ade7854_i2c_write_reg_16;
    st->write_reg_24 = ade7854_i2c_write_reg_24;
    st->write_reg_32 = ade7854_i2c_write_reg_32;
    st->i2c = client;
    st->irq = client->irq;

    ret = ade7854_probe(indio_dev, &client->dev);
    if (ret)
        iio_device_free(indio_dev);

    return ret;
}

static int __devexit ade7854_i2c_remove(struct i2c_client *client)
{
    return ade7854_remove(i2c_get_clientdata(client));
}

static const struct i2c_device_id ade7854_id[] = {
    { "ade7854", 0 },
    { "ade7858", 0 },
    { "ade7868", 0 },
    { "ade7878", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, ade7854_id);

static struct i2c_driver ade7854_i2c_driver = {
    .driver = {
        .name = "ade7854",
    },
    .probe    = ade7854_i2c_probe,
    .remove   = __devexit_p(ade7854_i2c_remove),
    .id_table = ade7854_id,
};
module_i2c_driver(ade7854_i2c_driver);

MODULE_AUTHOR("Barry Song <[email protected]>");
MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC I2C Driver");
MODULE_LICENSE("GPL v2");