blob: dca688f3cbdb42bc6d85688cc20960de32db402a [file] [log] [blame]
/* lps25hb.c - Driver for LPS25HB pressure and temperature sensor */
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT st_lps25hb_press
#include <zephyr/drivers/sensor.h>
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/init.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/logging/log.h>
#include "lps25hb.h"
LOG_MODULE_REGISTER(LPS25HB, CONFIG_SENSOR_LOG_LEVEL);
static inline int lps25hb_power_ctrl(const struct device *dev, uint8_t value)
{
const struct lps25hb_config *config = dev->config;
return i2c_reg_update_byte_dt(&config->i2c, LPS25HB_REG_CTRL_REG1,
LPS25HB_MASK_CTRL_REG1_PD,
value << LPS25HB_SHIFT_CTRL_REG1_PD);
}
static inline int lps25hb_set_odr_raw(const struct device *dev, uint8_t odr)
{
const struct lps25hb_config *config = dev->config;
return i2c_reg_update_byte_dt(&config->i2c, LPS25HB_REG_CTRL_REG1,
LPS25HB_MASK_CTRL_REG1_ODR,
odr << LPS25HB_SHIFT_CTRL_REG1_ODR);
}
static int lps25hb_sample_fetch(const struct device *dev,
enum sensor_channel chan)
{
struct lps25hb_data *data = dev->data;
const struct lps25hb_config *config = dev->config;
uint8_t out[5];
int offset;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
for (offset = 0; offset < sizeof(out); ++offset) {
if (i2c_reg_read_byte_dt(&config->i2c,
LPS25HB_REG_PRESS_OUT_XL + offset,
out + offset) < 0) {
LOG_DBG("failed to read sample");
return -EIO;
}
}
data->sample_press = (int32_t)((uint32_t)(out[0]) |
((uint32_t)(out[1]) << 8) |
((uint32_t)(out[2]) << 16));
data->sample_temp = (int16_t)((uint16_t)(out[3]) |
((uint16_t)(out[4]) << 8));
return 0;
}
static inline void lps25hb_press_convert(struct sensor_value *val,
int32_t raw_val)
{
/* val = raw_val / 40960 */
val->val1 = raw_val / 40960;
val->val2 = ((int32_t)raw_val * 1000000 / 40960) % 1000000;
}
static inline void lps25hb_temp_convert(struct sensor_value *val,
int16_t raw_val)
{
int32_t uval;
/* val = raw_val / 480 + 42.5 */
uval = (int32_t)raw_val * 1000000 / 480 + 42500000;
val->val1 = (raw_val * 10 / 480 + 425) / 10;
val->val2 = uval % 1000000;
}
static int lps25hb_channel_get(const struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct lps25hb_data *data = dev->data;
if (chan == SENSOR_CHAN_PRESS) {
lps25hb_press_convert(val, data->sample_press);
} else if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
lps25hb_temp_convert(val, data->sample_temp);
} else {
return -ENOTSUP;
}
return 0;
}
static const struct sensor_driver_api lps25hb_api_funcs = {
.sample_fetch = lps25hb_sample_fetch,
.channel_get = lps25hb_channel_get,
};
static int lps25hb_init_chip(const struct device *dev)
{
const struct lps25hb_config *config = dev->config;
uint8_t chip_id;
lps25hb_power_ctrl(dev, 0);
k_busy_wait(USEC_PER_MSEC * 50U);
if (lps25hb_power_ctrl(dev, 1) < 0) {
LOG_DBG("failed to power on device");
return -EIO;
}
k_busy_wait(USEC_PER_MSEC * 20U);
if (i2c_reg_read_byte_dt(&config->i2c, LPS25HB_REG_WHO_AM_I,
&chip_id) < 0) {
LOG_DBG("failed reading chip id");
goto err_poweroff;
}
if (chip_id != LPS25HB_VAL_WHO_AM_I) {
LOG_DBG("invalid chip id 0x%x", chip_id);
goto err_poweroff;
}
LOG_DBG("chip id 0x%x", chip_id);
if (lps25hb_set_odr_raw(dev, LPS25HB_DEFAULT_SAMPLING_RATE)
< 0) {
LOG_DBG("failed to set sampling rate");
goto err_poweroff;
}
if (i2c_reg_update_byte_dt(&config->i2c, LPS25HB_REG_CTRL_REG1,
LPS25HB_MASK_CTRL_REG1_BDU,
(1 << LPS25HB_SHIFT_CTRL_REG1_BDU)) < 0) {
LOG_DBG("failed to set BDU");
goto err_poweroff;
}
return 0;
err_poweroff:
lps25hb_power_ctrl(dev, 0);
return -EIO;
}
static int lps25hb_init(const struct device *dev)
{
const struct lps25hb_config * const config = dev->config;
if (!device_is_ready(config->i2c.bus)) {
LOG_ERR("I2C bus device not ready");
return -ENODEV;
}
if (lps25hb_init_chip(dev) < 0) {
LOG_DBG("failed to initialize chip");
return -EIO;
}
return 0;
}
static const struct lps25hb_config lps25hb_config = {
.i2c = I2C_DT_SPEC_INST_GET(0),
};
static struct lps25hb_data lps25hb_data;
DEVICE_DT_INST_DEFINE(0, lps25hb_init, NULL,
&lps25hb_data, &lps25hb_config, POST_KERNEL,
CONFIG_SENSOR_INIT_PRIORITY, &lps25hb_api_funcs);