1 files changed, 68 insertions, 0 deletions
diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
new file mode 100644
index 000000000..ee95082c7
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -0,0 +1,68 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * STMicroelectronics sensors i2c library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/common/st_sensors_i2c.h>
+
+#define ST_SENSORS_I2C_MULTIREAD	0x80
+
+static const struct regmap_config st_sensors_i2c_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct regmap_config st_sensors_i2c_regmap_multiread_bit_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.read_flag_mask = ST_SENSORS_I2C_MULTIREAD,
+};
+
+/*
+ * st_sensors_i2c_configure() - configure I2C interface
+ * @indio_dev: IIO device reference.
+ * @client: i2c client reference.
+ *
+ * Return: 0 on success, else a negative error code.
+ */
+int st_sensors_i2c_configure(struct iio_dev *indio_dev,
+			     struct i2c_client *client)
+{
+	struct st_sensor_data *sdata = iio_priv(indio_dev);
+	const struct regmap_config *config;
+
+	if (sdata->sensor_settings->multi_read_bit)
+		config = &st_sensors_i2c_regmap_multiread_bit_config;
+	else
+		config = &st_sensors_i2c_regmap_config;
+
+	sdata->regmap = devm_regmap_init_i2c(client, config);
+	if (IS_ERR(sdata->regmap)) {
+		dev_err(&client->dev, "Failed to register i2c regmap (%ld)\n",
+			PTR_ERR(sdata->regmap));
+		return PTR_ERR(sdata->regmap);
+	}
+
+	i2c_set_clientdata(client, indio_dev);
+
+	indio_dev->name = client->name;
+
+	sdata->irq = client->irq;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(st_sensors_i2c_configure, IIO_ST_SENSORS);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
+MODULE_LICENSE("GPL v2");