| /* |
| * Copyright (c) 2018 Philémon Jaermann |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <i2c.h> |
| #include <init.h> |
| #include <sensor.h> |
| |
| #define LOG_LEVEL CONFIG_SENSOR_LOG_LEVEL |
| #include <logging/log.h> |
| LOG_MODULE_REGISTER(lsm303dlhc_magn); |
| |
| #include "lsm303dlhc_magn.h" |
| |
| static int lsm303dlhc_sample_fetch(struct device *dev, |
| enum sensor_channel chan) |
| { |
| const struct lsm303dlhc_magn_config *config = dev->config->config_info; |
| struct lsm303dlhc_magn_data *drv_data = dev->driver_data; |
| u8_t magn_buf[6]; |
| u8_t status; |
| |
| /* Check data ready flag */ |
| if (i2c_reg_read_byte(drv_data->i2c, |
| config->i2c_address, |
| LSM303DLHC_SR_REG_M, |
| &status) < 0) { |
| LOG_ERR("Failed to read status register."); |
| return -EIO; |
| } |
| |
| if (!(status & LSM303DLHC_MAGN_DRDY)) { |
| LOG_ERR("Sensor data not available."); |
| return -EIO; |
| } |
| |
| if (i2c_burst_read(drv_data->i2c, |
| config->i2c_address, |
| LSM303DLHC_REG_MAGN_X_LSB, |
| magn_buf, 6) < 0) { |
| LOG_ERR("Could not read magn axis data."); |
| return -EIO; |
| } |
| |
| drv_data->magn_x = (magn_buf[0] << 8) | magn_buf[1]; |
| drv_data->magn_y = (magn_buf[4] << 8) | magn_buf[5]; |
| drv_data->magn_z = (magn_buf[2] << 8) | magn_buf[3]; |
| |
| return 0; |
| } |
| |
| static void lsm303dlhc_convert(struct sensor_value *val, |
| s64_t raw_val) |
| { |
| val->val1 = raw_val / LSM303DLHC_MAGN_LSB_GAUSS; |
| val->val2 = (1000000 * raw_val / LSM303DLHC_MAGN_LSB_GAUSS) % 1000000; |
| } |
| |
| static int lsm303dlhc_channel_get(struct device *dev, |
| enum sensor_channel chan, |
| struct sensor_value *val) |
| { |
| struct lsm303dlhc_magn_data *drv_data = dev->driver_data; |
| |
| switch (chan) { |
| case SENSOR_CHAN_MAGN_X: |
| lsm303dlhc_convert(val, drv_data->magn_x); |
| break; |
| case SENSOR_CHAN_MAGN_Y: |
| lsm303dlhc_convert(val, drv_data->magn_y); |
| break; |
| case SENSOR_CHAN_MAGN_Z: |
| lsm303dlhc_convert(val, drv_data->magn_z); |
| break; |
| case SENSOR_CHAN_MAGN_XYZ: |
| lsm303dlhc_convert(val, drv_data->magn_x); |
| lsm303dlhc_convert(val + 1, drv_data->magn_y); |
| lsm303dlhc_convert(val + 2, drv_data->magn_z); |
| break; |
| default: |
| return -ENOTSUP; |
| } |
| return 0; |
| } |
| |
| static const struct sensor_driver_api lsm303dlhc_magn_driver_api = { |
| .sample_fetch = lsm303dlhc_sample_fetch, |
| .channel_get = lsm303dlhc_channel_get, |
| }; |
| |
| static int lsm303dlhc_magn_init(struct device *dev) |
| { |
| const struct lsm303dlhc_magn_config *config = dev->config->config_info; |
| struct lsm303dlhc_magn_data *drv_data = dev->driver_data; |
| |
| drv_data->i2c = device_get_binding(config->i2c_name); |
| if (drv_data->i2c == NULL) { |
| LOG_ERR("Could not get pointer to %s device", |
| config->i2c_name); |
| return -ENODEV; |
| } |
| |
| /* Set magnetometer output data rate */ |
| if (i2c_reg_write_byte(drv_data->i2c, |
| config->i2c_address, |
| LSM303DLHC_CRA_REG_M, |
| LSM303DLHC_MAGN_ODR_BITS) < 0) { |
| LOG_ERR("Failed to configure chip."); |
| return -EIO; |
| } |
| |
| /* Set magnetometer full scale range */ |
| if (i2c_reg_write_byte(drv_data->i2c, |
| config->i2c_address, |
| LSM303DLHC_CRB_REG_M, |
| LSM303DLHC_MAGN_FS_BITS) < 0) { |
| LOG_ERR("Failed to set magnetometer full scale range."); |
| return -EIO; |
| } |
| |
| /* Continuous update */ |
| if (i2c_reg_write_byte(drv_data->i2c, |
| config->i2c_address, |
| LSM303DLHC_MR_REG_M, |
| LSM303DLHC_MAGN_CONT_UPDATE) < 0) { |
| LOG_ERR("Failed to enable continuous data update."); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| static const struct lsm303dlhc_magn_config lsm303dlhc_magn_config = { |
| .i2c_name = DT_ST_LSM303DLHC_MAGN_0_BUS_NAME, |
| .i2c_address = DT_ST_LSM303DLHC_MAGN_0_BASE_ADDRESS, |
| }; |
| |
| static struct lsm303dlhc_magn_data lsm303dlhc_magn_driver; |
| |
| DEVICE_AND_API_INIT(lsm303dlhc_magn, DT_ST_LSM303DLHC_MAGN_0_LABEL, |
| lsm303dlhc_magn_init, &lsm303dlhc_magn_driver, |
| &lsm303dlhc_magn_config, POST_KERNEL, |
| CONFIG_SENSOR_INIT_PRIORITY, &lsm303dlhc_magn_driver_api); |