| // 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/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/iio/iio.h> |
| #include <linux/of_device.h> |
| #include <linux/acpi.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 (%d)\n", |
| (int)PTR_ERR(sdata->regmap)); |
| return PTR_ERR(sdata->regmap); |
| } |
| |
| i2c_set_clientdata(client, indio_dev); |
| |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->name = client->name; |
| |
| sdata->dev = &client->dev; |
| sdata->irq = client->irq; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(st_sensors_i2c_configure); |
| |
| #ifdef CONFIG_ACPI |
| int st_sensors_match_acpi_device(struct device *dev) |
| { |
| const struct acpi_device_id *acpi_id; |
| kernel_ulong_t driver_data = 0; |
| |
| if (ACPI_HANDLE(dev)) { |
| acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev); |
| if (!acpi_id) { |
| dev_err(dev, "No driver data\n"); |
| return -EINVAL; |
| } |
| driver_data = acpi_id->driver_data; |
| } |
| return driver_data; |
| } |
| EXPORT_SYMBOL(st_sensors_match_acpi_device); |
| #endif |
| |
| MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); |
| MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); |
| MODULE_LICENSE("GPL v2"); |