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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(struct device *dev,
u16 reg_address,
u32 val,
int bits)
{
int ret;
int count;
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;
switch (bits) {
case 8:
st->tx[2] = val & 0xFF;
count = 3;
break;
case 16:
st->tx[2] = (val >> 8) & 0xFF;
st->tx[3] = val & 0xFF;
count = 4;
break;
case 24:
st->tx[2] = (val >> 16) & 0xFF;
st->tx[3] = (val >> 8) & 0xFF;
st->tx[4] = val & 0xFF;
count = 5;
break;
case 32:
st->tx[2] = (val >> 24) & 0xFF;
st->tx[3] = (val >> 16) & 0xFF;
st->tx[4] = (val >> 8) & 0xFF;
st->tx[5] = val & 0xFF;
count = 6;
break;
default:
ret = -EINVAL;
goto unlock;
}
ret = i2c_master_send(st->i2c, st->tx, count);
unlock:
mutex_unlock(&st->buf_lock);
return ret < 0 ? ret : 0;
}
static int ade7854_i2c_read_reg(struct device *dev,
u16 reg_address,
u32 *val,
int bits)
{
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 < 0)
goto unlock;
ret = i2c_master_recv(st->i2c, st->rx, bits);
if (ret < 0)
goto unlock;
switch (bits) {
case 8:
*val = st->rx[0];
break;
case 16:
*val = (st->rx[0] << 8) | st->rx[1];
break;
case 24:
*val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
break;
case 32:
*val = (st->rx[0] << 24) | (st->rx[1] << 16) |
(st->rx[2] << 8) | st->rx[3];
break;
default:
ret = -EINVAL;
goto unlock;
}
unlock:
mutex_unlock(&st->buf_lock);
return ret;
}
static int ade7854_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ade7854_state *st;
struct iio_dev *indio_dev;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
st->read_reg = ade7854_i2c_read_reg;
st->write_reg = ade7854_i2c_write_reg;
st->i2c = client;
st->irq = client->irq;
return ade7854_probe(indio_dev, &client->dev);
}
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,
.id_table = ade7854_id,
};
module_i2c_driver(ade7854_i2c_driver);
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC I2C Driver");
MODULE_LICENSE("GPL v2");
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