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 20 static const struct regmap_config st_sensors_i2c_regmap_config = { 21 .reg_bits = 8, 22 .val_bits = 8, 23 }; 24 25 static 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 */ 38 int 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 } 64 EXPORT_SYMBOL_NS(st_sensors_i2c_configure, IIO_ST_SENSORS); 65 66 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 67 MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); 68 MODULE_LICENSE("GPL v2"); 69