| /* |
| * STMicroelectronics sensors i2c library driver |
| * |
| * Copyright 2012-2013 STMicroelectronics Inc. |
| * |
| * Denis Ciocca <denis.ciocca@st.com> |
| * |
| * Licensed under the GPL-2. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/iio/iio.h> |
| #include <linux/of_device.h> |
| |
| #include <linux/iio/common/st_sensors_i2c.h> |
| |
| |
| #define ST_SENSORS_I2C_MULTIREAD 0x80 |
| |
| static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev) |
| { |
| struct st_sensor_data *sdata = iio_priv(indio_dev); |
| |
| return to_i2c_client(sdata->dev)->irq; |
| } |
| |
| static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb, |
| struct device *dev, u8 reg_addr, u8 *res_byte) |
| { |
| int err; |
| |
| err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr); |
| if (err < 0) |
| goto st_accel_i2c_read_byte_error; |
| |
| *res_byte = err & 0xff; |
| |
| st_accel_i2c_read_byte_error: |
| return err < 0 ? err : 0; |
| } |
| |
| static int st_sensors_i2c_read_multiple_byte( |
| struct st_sensor_transfer_buffer *tb, struct device *dev, |
| u8 reg_addr, int len, u8 *data, bool multiread_bit) |
| { |
| if (multiread_bit) |
| reg_addr |= ST_SENSORS_I2C_MULTIREAD; |
| |
| return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev), |
| reg_addr, len, data); |
| } |
| |
| static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb, |
| struct device *dev, u8 reg_addr, u8 data) |
| { |
| return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data); |
| } |
| |
| static const struct st_sensor_transfer_function st_sensors_tf_i2c = { |
| .read_byte = st_sensors_i2c_read_byte, |
| .write_byte = st_sensors_i2c_write_byte, |
| .read_multiple_byte = st_sensors_i2c_read_multiple_byte, |
| }; |
| |
| void st_sensors_i2c_configure(struct iio_dev *indio_dev, |
| struct i2c_client *client, struct st_sensor_data *sdata) |
| { |
| i2c_set_clientdata(client, indio_dev); |
| |
| indio_dev->dev.parent = &client->dev; |
| indio_dev->name = client->name; |
| |
| sdata->dev = &client->dev; |
| sdata->tf = &st_sensors_tf_i2c; |
| sdata->get_irq_data_ready = st_sensors_i2c_get_irq; |
| } |
| EXPORT_SYMBOL(st_sensors_i2c_configure); |
| |
| #ifdef CONFIG_OF |
| /** |
| * st_sensors_of_i2c_probe() - device tree probe for ST I2C sensors |
| * @client: the I2C client device for the sensor |
| * @match: the OF match table for the device, containing compatible strings |
| * but also a .data field with the corresponding internal kernel name |
| * used by this sensor. |
| * |
| * In effect this function matches a compatible string to an internal kernel |
| * name for a certain sensor device, so that the rest of the autodetection can |
| * rely on that name from this point on. I2C client devices will be renamed |
| * to match the internal kernel convention. |
| */ |
| void st_sensors_of_i2c_probe(struct i2c_client *client, |
| const struct of_device_id *match) |
| { |
| const struct of_device_id *of_id; |
| |
| of_id = of_match_device(match, &client->dev); |
| if (!of_id) |
| return; |
| |
| /* The name from the OF match takes precedence if present */ |
| strncpy(client->name, of_id->data, sizeof(client->name)); |
| client->name[sizeof(client->name) - 1] = '\0'; |
| } |
| EXPORT_SYMBOL(st_sensors_of_i2c_probe); |
| #endif |
| |
| MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); |
| MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); |
| MODULE_LICENSE("GPL v2"); |