drivers/iio/common/st_sensors/st_sensors_i2c.c

   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");