// SPDX-License-Identifier: GPL-2.0+
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/*
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* ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (I2C Bus)
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*
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* Copyright 2010 Analog Devices Inc.
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include "ade7854.h"
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static int ade7854_i2c_write_reg(struct device *dev,
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u16 reg_address,
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u32 val,
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int bits)
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{
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int ret;
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int count;
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ade7854_state *st = iio_priv(indio_dev);
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mutex_lock(&st->buf_lock);
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st->tx[0] = (reg_address >> 8) & 0xFF;
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st->tx[1] = reg_address & 0xFF;
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switch (bits) {
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case 8:
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st->tx[2] = val & 0xFF;
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count = 3;
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break;
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case 16:
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st->tx[2] = (val >> 8) & 0xFF;
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st->tx[3] = val & 0xFF;
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count = 4;
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break;
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case 24:
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st->tx[2] = (val >> 16) & 0xFF;
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st->tx[3] = (val >> 8) & 0xFF;
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st->tx[4] = val & 0xFF;
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count = 5;
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break;
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case 32:
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st->tx[2] = (val >> 24) & 0xFF;
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st->tx[3] = (val >> 16) & 0xFF;
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st->tx[4] = (val >> 8) & 0xFF;
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st->tx[5] = val & 0xFF;
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count = 6;
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break;
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default:
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ret = -EINVAL;
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goto unlock;
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}
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ret = i2c_master_send(st->i2c, st->tx, count);
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unlock:
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mutex_unlock(&st->buf_lock);
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return ret < 0 ? ret : 0;
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}
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static int ade7854_i2c_read_reg(struct device *dev,
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u16 reg_address,
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u32 *val,
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int bits)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct ade7854_state *st = iio_priv(indio_dev);
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int ret;
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mutex_lock(&st->buf_lock);
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st->tx[0] = (reg_address >> 8) & 0xFF;
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st->tx[1] = reg_address & 0xFF;
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ret = i2c_master_send(st->i2c, st->tx, 2);
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if (ret < 0)
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goto unlock;
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ret = i2c_master_recv(st->i2c, st->rx, bits);
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if (ret < 0)
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goto unlock;
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switch (bits) {
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case 8:
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*val = st->rx[0];
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break;
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case 16:
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*val = (st->rx[0] << 8) | st->rx[1];
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break;
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case 24:
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*val = (st->rx[0] << 16) | (st->rx[1] << 8) | st->rx[2];
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break;
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case 32:
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*val = (st->rx[0] << 24) | (st->rx[1] << 16) |
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(st->rx[2] << 8) | st->rx[3];
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break;
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default:
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ret = -EINVAL;
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goto unlock;
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}
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unlock:
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mutex_unlock(&st->buf_lock);
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return ret;
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}
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static int ade7854_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct ade7854_state *st;
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struct iio_dev *indio_dev;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
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if (!indio_dev)
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return -ENOMEM;
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st = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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st->read_reg = ade7854_i2c_read_reg;
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st->write_reg = ade7854_i2c_write_reg;
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st->i2c = client;
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st->irq = client->irq;
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return ade7854_probe(indio_dev, &client->dev);
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}
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static const struct i2c_device_id ade7854_id[] = {
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{ "ade7854", 0 },
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{ "ade7858", 0 },
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{ "ade7868", 0 },
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{ "ade7878", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ade7854_id);
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static struct i2c_driver ade7854_i2c_driver = {
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.driver = {
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.name = "ade7854",
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},
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.probe = ade7854_i2c_probe,
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.id_table = ade7854_id,
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};
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module_i2c_driver(ade7854_i2c_driver);
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MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
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MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC I2C Driver");
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MODULE_LICENSE("GPL v2");
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