1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * STMicroelectronics sensors i2c library driver
4 *
5 * Copyright 2012-2013 STMicroelectronics Inc.
6 *
7 * Denis Ciocca <denis.ciocca@st.com>
8 */
9
10#include <linux/i2c.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/iio/iio.h>
14#include <linux/regmap.h>
15
16#include <linux/iio/common/st_sensors_i2c.h>
17
18#define ST_SENSORS_I2C_MULTIREAD	0x80
19
20static const struct regmap_config st_sensors_i2c_regmap_config = {
21	.reg_bits = 8,
22	.val_bits = 8,
23};
24
25static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = {
26	.reg_bits = 8,
27	.val_bits = 8,
28	.read_flag_mask = ST_SENSORS_I2C_MULTIREAD,
29};
30
31/*
32 * st_sensors_i2c_configure() - configure I2C interface
33 * @indio_dev: IIO device reference.
34 * @client: i2c client reference.
35 *
36 * Return: 0 on success, else a negative error code.
37 */
38int st_sensors_i2c_configure(struct iio_dev *indio_dev,
39			     struct i2c_client *client)
40{
41	struct st_sensor_data *sdata = iio_priv(indio_dev);
42	const struct regmap_config *config;
43
44	if (sdata->sensor_settings->multi_read_bit)
45		config = &st_sensors_i2c_regmap_multiread_bit_config;
46	else
47		config = &st_sensors_i2c_regmap_config;
48
49	sdata->regmap = devm_regmap_init_i2c(client, config);
50	if (IS_ERR(sdata->regmap)) {
51		dev_err(&client->dev, "Failed to register i2c regmap (%ld)\n",
52			PTR_ERR(sdata->regmap));
53		return PTR_ERR(sdata->regmap);
54	}
55
56	i2c_set_clientdata(client, indio_dev);
57
58	indio_dev->name = client->name;
59
60	sdata->irq = client->irq;
61
62	return 0;
63}
64EXPORT_SYMBOL_NS(st_sensors_i2c_configure, IIO_ST_SENSORS);
65
66MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
67MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
68MODULE_LICENSE("GPL v2");
69