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lps22hh.c
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lps22hh.c
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/* ST Microelectronics LPS22HH pressure and temperature sensor
*
* Copyright (c) 2019 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*
* Datasheet:
* https://www.st.com/resource/en/datasheet/lps22hh.pdf
*/
#define DT_DRV_COMPAT st_lps22hh
#include <drivers/sensor.h>
#include <kernel.h>
#include <device.h>
#include <init.h>
#include <sys/byteorder.h>
#include <sys/__assert.h>
#include <logging/log.h>
#include "lps22hh.h"
LOG_MODULE_REGISTER(LPS22HH, CONFIG_SENSOR_LOG_LEVEL);
static inline int lps22hh_set_odr_raw(struct device *dev, u8_t odr)
{
struct lps22hh_data *data = dev->driver_data;
return lps22hh_data_rate_set(data->ctx, odr);
}
static int lps22hh_sample_fetch(struct device *dev,
enum sensor_channel chan)
{
struct lps22hh_data *data = dev->driver_data;
union axis1bit32_t raw_press;
union axis1bit16_t raw_temp;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
if (lps22hh_pressure_raw_get(data->ctx, raw_press.u8bit) < 0) {
LOG_DBG("Failed to read sample");
return -EIO;
}
if (lps22hh_temperature_raw_get(data->ctx, raw_temp.u8bit) < 0) {
LOG_DBG("Failed to read sample");
return -EIO;
}
data->sample_press = raw_press.i32bit;
data->sample_temp = raw_temp.i16bit;
return 0;
}
static inline void lps22hh_press_convert(struct sensor_value *val,
s32_t raw_val)
{
/* Pressure sensitivity is 4096 LSB/hPa */
/* Convert raw_val to val in kPa */
val->val1 = (raw_val >> 12) / 10;
val->val2 = (raw_val >> 12) % 10 * 100000 +
(((s32_t)((raw_val) & 0x0FFF) * 100000L) >> 12);
}
static inline void lps22hh_temp_convert(struct sensor_value *val,
s16_t raw_val)
{
/* Temperature sensitivity is 100 LSB/deg C */
val->val1 = raw_val / 100;
val->val2 = ((s32_t)raw_val % 100) * 10000;
}
static int lps22hh_channel_get(struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct lps22hh_data *data = dev->driver_data;
if (chan == SENSOR_CHAN_PRESS) {
lps22hh_press_convert(val, data->sample_press);
} else if (chan == SENSOR_CHAN_AMBIENT_TEMP) {
lps22hh_temp_convert(val, data->sample_temp);
} else {
return -ENOTSUP;
}
return 0;
}
static const u16_t lps22hh_map[] = {0, 1, 10, 25, 50, 75, 100, 200};
static int lps22hh_odr_set(struct device *dev, u16_t freq)
{
int odr;
for (odr = 0; odr < ARRAY_SIZE(lps22hh_map); odr++) {
if (freq == lps22hh_map[odr]) {
break;
}
}
if (odr == ARRAY_SIZE(lps22hh_map)) {
LOG_DBG("bad frequency");
return -EINVAL;
}
if (lps22hh_set_odr_raw(dev, odr) < 0) {
LOG_DBG("failed to set sampling rate");
return -EIO;
}
return 0;
}
static int lps22hh_attr_set(struct device *dev, enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *val)
{
if (chan != SENSOR_CHAN_ALL) {
LOG_WRN("attr_set() not supported on this channel.");
return -ENOTSUP;
}
switch (attr) {
case SENSOR_ATTR_SAMPLING_FREQUENCY:
return lps22hh_odr_set(dev, val->val1);
default:
LOG_DBG("operation not supported.");
return -ENOTSUP;
}
return 0;
}
static const struct sensor_driver_api lps22hh_api_funcs = {
.attr_set = lps22hh_attr_set,
.sample_fetch = lps22hh_sample_fetch,
.channel_get = lps22hh_channel_get,
#if CONFIG_LPS22HH_TRIGGER
.trigger_set = lps22hh_trigger_set,
#endif
};
static int lps22hh_init_chip(struct device *dev)
{
struct lps22hh_data *data = dev->driver_data;
u8_t chip_id;
if (lps22hh_device_id_get(data->ctx, &chip_id) < 0) {
LOG_DBG("Failed reading chip id");
return -EIO;
}
if (chip_id != LPS22HH_ID) {
LOG_DBG("Invalid chip id 0x%x", chip_id);
return -EIO;
}
if (lps22hh_set_odr_raw(dev, CONFIG_LPS22HH_SAMPLING_RATE) < 0) {
LOG_DBG("Failed to set sampling rate");
return -EIO;
}
if (lps22hh_block_data_update_set(data->ctx, PROPERTY_ENABLE) < 0) {
LOG_DBG("Failed to set BDU");
return -EIO;
}
return 0;
}
static int lps22hh_init(struct device *dev)
{
const struct lps22hh_config * const config = dev->config_info;
struct lps22hh_data *data = dev->driver_data;
data->bus = device_get_binding(config->master_dev_name);
if (!data->bus) {
LOG_DBG("bus master not found: %s", config->master_dev_name);
return -EINVAL;
}
config->bus_init(dev);
if (lps22hh_init_chip(dev) < 0) {
LOG_DBG("Failed to initialize chip");
return -EIO;
}
#ifdef CONFIG_LPS22HH_TRIGGER
if (lps22hh_init_interrupt(dev) < 0) {
LOG_ERR("Failed to initialize interrupt.");
return -EIO;
}
#endif
return 0;
}
static struct lps22hh_data lps22hh_data;
static const struct lps22hh_config lps22hh_config = {
.master_dev_name = DT_INST_BUS_LABEL(0),
#ifdef CONFIG_LPS22HH_TRIGGER
.drdy_port = DT_INST_GPIO_LABEL(0, drdy_gpios),
.drdy_pin = DT_INST_GPIO_PIN(0, drdy_gpios),
.drdy_flags = DT_INST_GPIO_FLAGS(0, drdy_gpios),
#endif
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
.bus_init = lps22hh_spi_init,
.spi_conf.frequency = DT_INST_PROP(0, spi_max_frequency),
.spi_conf.operation = (SPI_OP_MODE_MASTER | SPI_MODE_CPOL |
SPI_MODE_CPHA | SPI_WORD_SET(8) |
SPI_LINES_SINGLE),
.spi_conf.slave = DT_INST_REG_ADDR(0),
#if DT_INST_SPI_DEV_HAS_CS_GPIOS(0)
.gpio_cs_port = DT_INST_SPI_DEV_CS_GPIOS_LABEL(0),
.cs_gpio = DT_INST_SPI_DEV_CS_GPIOS_PIN(0),
.spi_conf.cs = &lps22hh_data.cs_ctrl,
#else
.spi_conf.cs = NULL,
#endif
#elif DT_ANY_INST_ON_BUS_STATUS_OKAY(i2c)
.bus_init = lps22hh_i2c_init,
.i2c_slv_addr = DT_INST_REG_ADDR(0),
#else
#error "BUS MACRO NOT DEFINED IN DTS"
#endif
};
DEVICE_AND_API_INIT(lps22hh, DT_INST_LABEL(0), lps22hh_init,
&lps22hh_data, &lps22hh_config, POST_KERNEL,
CONFIG_SENSOR_INIT_PRIORITY, &lps22hh_api_funcs);