[linux-2.6-block.git] / drivers / staging / iio / meter / ade7854-i2c.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (I2C Bus)
 *
 * Copyright 2010 Analog Devices Inc.
 */

#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");
Commit	Line	Data
2506abea	1	// SPDX-License-Identifier: GPL-2.0+
5b264a62 BS	2	/*
	3	* ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC Driver (I2C Bus)
	4	*
	5	* Copyright 2010 Analog Devices Inc.
5b264a62 BS	6	*/
	7
	8	#include <linux/device.h>
	9	#include <linux/kernel.h>
	10	#include <linux/i2c.h>
	11	#include <linux/slab.h>
99c97852	12	#include <linux/module.h>
5b264a62	13
06458e27	14	#include <linux/iio/iio.h>
5b264a62 BS	15	#include "ade7854.h"
5b264a62 BS	16
e4c771d3 RS	17	static int ade7854_i2c_write_reg(struct device *dev,
	18	u16 reg_address,
	19	u32 val,
	20	int bits)
5b264a62 BS	21	{
5b264a62 BS	22	int ret;
e4c771d3	23	int count;
196b59c1	24	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
937a9601	25	struct ade7854_state *st = iio_priv(indio_dev);
5b264a62 BS	26
	27	mutex_lock(&st->buf_lock);
	28	st->tx[0] = (reg_address >> 8) & 0xFF;
	29	st->tx[1] = reg_address & 0xFF;
5b264a62	30
e4c771d3 RS	31	switch (bits) {
	32	case 8:
	33	st->tx[2] = val & 0xFF;
	34	count = 3;
	35	break;
	36	case 16:
	37	st->tx[2] = (val >> 8) & 0xFF;
	38	st->tx[3] = val & 0xFF;
	39	count = 4;
	40	break;
	41	case 24:
	42	st->tx[2] = (val >> 16) & 0xFF;
	43	st->tx[3] = (val >> 8) & 0xFF;
	44	st->tx[4] = val & 0xFF;
	45	count = 5;
	46	break;
	47	case 32:
	48	st->tx[2] = (val >> 24) & 0xFF;
	49	st->tx[3] = (val >> 16) & 0xFF;
	50	st->tx[4] = (val >> 8) & 0xFF;
	51	st->tx[5] = val & 0xFF;
	52	count = 6;
	53	break;
	54	default:
	55	ret = -EINVAL;
	56	goto unlock;
	57	}
	58
	59	ret = i2c_master_send(st->i2c, st->tx, count);
	60
	61	unlock:
5b264a62 BS	62	mutex_unlock(&st->buf_lock);
5b264a62 BS	63
4297b23d	64	return ret < 0 ? ret : 0;
5b264a62 BS	65	}
5b264a62 BS	66
5d55dcbc RS	67	static int ade7854_i2c_read_reg(struct device *dev,
	68	u16 reg_address,
	69	u32 *val,
	70	int bits)
5b264a62	71	{
196b59c1	72	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
937a9601	73	struct ade7854_state *st = iio_priv(indio_dev);
5b264a62 BS	74	int ret;
	75
	76	mutex_lock(&st->buf_lock);
	77	st->tx[0] = (reg_address >> 8) & 0xFF;
	78	st->tx[1] = reg_address & 0xFF;
	79
	80	ret = i2c_master_send(st->i2c, st->tx, 2);
4297b23d	81	if (ret < 0)
5d55dcbc	82	goto unlock;
5b264a62	83
5d55dcbc	84	ret = i2c_master_recv(st->i2c, st->rx, bits);
4297b23d	85	if (ret < 0)
5d55dcbc RS	86	goto unlock;
	87
	88	switch (bits) {
	89	case 8:
	90	*val = st->rx[0];
	91	break;
	92	case 16:
	93	*val = (st->rx[0] << 8) \| st->rx[1];
	94	break;
	95	case 24:
	96	*val = (st->rx[0] << 16) \| (st->rx[1] << 8) \| st->rx[2];
	97	break;
	98	case 32:
	99	*val = (st->rx[0] << 24) \| (st->rx[1] << 16) \|
	100	(st->rx[2] << 8) \| st->rx[3];
	101	break;
	102	default:
	103	ret = -EINVAL;
	104	goto unlock;
	105	}
5b264a62	106
5d55dcbc	107	unlock:
5b264a62 BS	108	mutex_unlock(&st->buf_lock);
	109	return ret;
	110	}
	111
4ae1c61f	112	static int ade7854_i2c_probe(struct i2c_client *client,
08c95f9a	113	const struct i2c_device_id *id)
5b264a62	114	{
937a9601 JC	115	struct ade7854_state *st;
	116	struct iio_dev *indio_dev;
	117
b909459f	118	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
f9be1085	119	if (!indio_dev)
937a9601 JC	120	return -ENOMEM;
	121	st = iio_priv(indio_dev);
	122	i2c_set_clientdata(client, indio_dev);
8ea0fa7c	123	st->read_reg = ade7854_i2c_read_reg;
259a8202	124	st->write_reg = ade7854_i2c_write_reg;
5b264a62 BS	125	st->i2c = client;
	126	st->irq = client->irq;
	127
07f83131	128	return ade7854_probe(indio_dev, &client->dev);
5b264a62 BS	129	}
5b264a62 BS	130
5b264a62 BS	131	static const struct i2c_device_id ade7854_id[] = {
	132	{ "ade7854", 0 },
	133	{ "ade7858", 0 },
	134	{ "ade7868", 0 },
	135	{ "ade7878", 0 },
	136	{ }
	137	};
	138	MODULE_DEVICE_TABLE(i2c, ade7854_id);
	139
	140	static struct i2c_driver ade7854_i2c_driver = {
	141	.driver = {
	142	.name = "ade7854",
	143	},
	144	.probe = ade7854_i2c_probe,
5b264a62 BS	145	.id_table = ade7854_id,
5b264a62 BS	146	};
6e5af184	147	module_i2c_driver(ade7854_i2c_driver);
5b264a62 BS	148
	149	MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
	150	MODULE_DESCRIPTION("Analog Devices ADE7854/58/68/78 Polyphase Multifunction Energy Metering IC I2C Driver");
	151	MODULE_LICENSE("GPL v2");