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/kernel.h> 11 #include <linux/module.h> 12 #include <linux/slab.h> 13 #include <linux/iio/iio.h> 14 #include <linux/regmap.h> 15 16 #include <linux/iio/common/st_sensors_i2c.h> 17 18 19 #define ST_SENSORS_I2C_MULTIREAD 0x80 20 21 static const struct regmap_config st_sensors_i2c_regmap_config = { 22 .reg_bits = 8, 23 .val_bits = 8, 24 }; 25 26 static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = { 27 .reg_bits = 8, 28 .val_bits = 8, 29 .read_flag_mask = ST_SENSORS_I2C_MULTIREAD, 30 }; 31 32 /* 33 * st_sensors_i2c_configure() - configure I2C interface 34 * @indio_dev: IIO device reference. 35 * @client: i2c client reference. 36 * 37 * Return: 0 on success, else a negative error code. 38 */ 39 int st_sensors_i2c_configure(struct iio_dev *indio_dev, 40 struct i2c_client *client) 41 { 42 struct st_sensor_data *sdata = iio_priv(indio_dev); 43 const struct regmap_config *config; 44 45 if (sdata->sensor_settings->multi_read_bit) 46 config = &st_sensors_i2c_regmap_multiread_bit_config; 47 else 48 config = &st_sensors_i2c_regmap_config; 49 50 sdata->regmap = devm_regmap_init_i2c(client, config); 51 if (IS_ERR(sdata->regmap)) { 52 dev_err(&client->dev, "Failed to register i2c regmap (%d)\n", 53 (int)PTR_ERR(sdata->regmap)); 54 return PTR_ERR(sdata->regmap); 55 } 56 57 i2c_set_clientdata(client, indio_dev); 58 59 indio_dev->dev.parent = &client->dev; 60 indio_dev->name = client->name; 61 62 sdata->dev = &client->dev; 63 sdata->irq = client->irq; 64 65 return 0; 66 } 67 EXPORT_SYMBOL(st_sensors_i2c_configure); 68 69 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 70 MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); 71 MODULE_LICENSE("GPL v2"); 72