| Denis Ciocca | 23491b5 | 2013-01-25 23:44:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * STMicroelectronics sensors i2c library driver |
| 3 | * |
| 4 | * Copyright 2012-2013 STMicroelectronics Inc. |
| 5 | * |
| 6 | * Denis Ciocca <denis.ciocca@st.com> |
| 7 | * |
| 8 | * Licensed under the GPL-2. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/kernel.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/slab.h> |
| 14 | #include <linux/iio/iio.h> |
| 15 | |
| 16 | #include <linux/iio/common/st_sensors_i2c.h> |
| 17 | |
| 18 | |
| 19 | #define ST_SENSORS_I2C_MULTIREAD 0x80 |
| 20 | |
| 21 | static unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev) |
| 22 | { |
| 23 | struct st_sensor_data *sdata = iio_priv(indio_dev); |
| 24 | |
| 25 | return to_i2c_client(sdata->dev)->irq; |
| 26 | } |
| 27 | |
| 28 | static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb, |
| 29 | struct device *dev, u8 reg_addr, u8 *res_byte) |
| 30 | { |
| 31 | int err; |
| 32 | |
| 33 | err = i2c_smbus_read_byte_data(to_i2c_client(dev), reg_addr); |
| 34 | if (err < 0) |
| 35 | goto st_accel_i2c_read_byte_error; |
| 36 | |
| 37 | *res_byte = err & 0xff; |
| 38 | |
| 39 | st_accel_i2c_read_byte_error: |
| 40 | return err < 0 ? err : 0; |
| 41 | } |
| 42 | |
| 43 | static int st_sensors_i2c_read_multiple_byte( |
| 44 | struct st_sensor_transfer_buffer *tb, struct device *dev, |
| 45 | u8 reg_addr, int len, u8 *data, bool multiread_bit) |
| 46 | { |
| 47 | if (multiread_bit) |
| 48 | reg_addr |= ST_SENSORS_I2C_MULTIREAD; |
| 49 | |
| 50 | return i2c_smbus_read_i2c_block_data(to_i2c_client(dev), |
| 51 | reg_addr, len, data); |
| 52 | } |
| 53 | |
| 54 | static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb, |
| 55 | struct device *dev, u8 reg_addr, u8 data) |
| 56 | { |
| 57 | return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data); |
| 58 | } |
| 59 | |
| 60 | static const struct st_sensor_transfer_function st_sensors_tf_i2c = { |
| 61 | .read_byte = st_sensors_i2c_read_byte, |
| 62 | .write_byte = st_sensors_i2c_write_byte, |
| 63 | .read_multiple_byte = st_sensors_i2c_read_multiple_byte, |
| 64 | }; |
| 65 | |
| 66 | void st_sensors_i2c_configure(struct iio_dev *indio_dev, |
| 67 | struct i2c_client *client, struct st_sensor_data *sdata) |
| 68 | { |
| 69 | i2c_set_clientdata(client, indio_dev); |
| 70 | |
| 71 | indio_dev->dev.parent = &client->dev; |
| 72 | indio_dev->name = client->name; |
| 73 | |
| 74 | sdata->tf = &st_sensors_tf_i2c; |
| 75 | sdata->get_irq_data_ready = st_sensors_i2c_get_irq; |
| 76 | } |
| 77 | EXPORT_SYMBOL(st_sensors_i2c_configure); |
| 78 | |
| 79 | MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); |
| 80 | MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver"); |
| 81 | MODULE_LICENSE("GPL v2"); |