common/st_sensors/st_sensors_i2c.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * STMicroelectronics sensors i2c library driver
0004  *
0005  * Copyright 2012-2013 STMicroelectronics Inc.
0006  *
0007  * Denis Ciocca <denis.ciocca@st.com>
0008  */
0009
0010 #include <linux/i2c.h>
0011 #include <linux/kernel.h>
0012 #include <linux/module.h>
0013 #include <linux/iio/iio.h>
0014 #include <linux/regmap.h>
0015
0016 #include <linux/iio/common/st_sensors_i2c.h>
0017
0018 #define ST_SENSORS_I2C_MULTIREAD    0x80
0019
0020 static const struct regmap_config st_sensors_i2c_regmap_config = {
0021     .reg_bits = 8,
0022     .val_bits = 8,
0023 };
0024
0025 static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = {
0026     .reg_bits = 8,
0027     .val_bits = 8,
0028     .read_flag_mask = ST_SENSORS_I2C_MULTIREAD,
0029 };
0030
0031 /*
0032  * st_sensors_i2c_configure() - configure I2C interface
0033  * @indio_dev: IIO device reference.
0034  * @client: i2c client reference.
0035  *
0036  * Return: 0 on success, else a negative error code.
0037  */
0038 int st_sensors_i2c_configure(struct iio_dev *indio_dev,
0039                  struct i2c_client *client)
0040 {
0041     struct st_sensor_data *sdata = iio_priv(indio_dev);
0042     const struct regmap_config *config;
0043
0044     if (sdata->sensor_settings->multi_read_bit)
0045         config = &st_sensors_i2c_regmap_multiread_bit_config;
0046     else
0047         config = &st_sensors_i2c_regmap_config;
0048
0049     sdata->regmap = devm_regmap_init_i2c(client, config);
0050     if (IS_ERR(sdata->regmap)) {
0051         dev_err(&client->dev, "Failed to register i2c regmap (%ld)\n",
0052             PTR_ERR(sdata->regmap));
0053         return PTR_ERR(sdata->regmap);
0054     }
0055
0056     i2c_set_clientdata(client, indio_dev);
0057
0058     indio_dev->name = client->name;
0059
0060     sdata->irq = client->irq;
0061
0062     return 0;
0063 }
0064 EXPORT_SYMBOL_NS(st_sensors_i2c_configure, IIO_ST_SENSORS);
0065
0066 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
0067 MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
0068 MODULE_LICENSE("GPL v2");