blob: 815d69b406373a134310a1e687e3896d24b670c7 [file] [log] [blame]
/*
* Copyright (c) 2016 Firmwave
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT ti_tmp112
#include <zephyr/device.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/sys/util.h>
#include <zephyr/kernel.h>
#include <zephyr/drivers/sensor.h>
#include <zephyr/sys/__assert.h>
#include <zephyr/logging/log.h>
#include "tmp112.h"
LOG_MODULE_REGISTER(TMP112, CONFIG_SENSOR_LOG_LEVEL);
static int tmp112_reg_read(const struct tmp112_config *cfg,
uint8_t reg, uint16_t *val)
{
if (i2c_burst_read_dt(&cfg->bus, reg, (uint8_t *)val, sizeof(*val)) < 0) {
return -EIO;
}
*val = sys_be16_to_cpu(*val);
return 0;
}
static int tmp112_reg_write(const struct tmp112_config *cfg,
uint8_t reg, uint16_t val)
{
uint8_t buf[3];
buf[0] = reg;
sys_put_be16(val, &buf[1]);
return i2c_write_dt(&cfg->bus, buf, sizeof(buf));
}
static uint16_t set_config_flags(struct tmp112_data *data, uint16_t mask,
uint16_t value)
{
return (data->config_reg & ~mask) | (value & mask);
}
static int tmp112_update_config(const struct device *dev, uint16_t mask,
uint16_t val)
{
int rc;
struct tmp112_data *data = dev->data;
const uint16_t new_val = set_config_flags(data, mask, val);
rc = tmp112_reg_write(dev->config, TMP112_REG_CONFIG, new_val);
if (rc == 0) {
data->config_reg = new_val;
}
return rc;
}
static int tmp112_attr_set(const struct device *dev,
enum sensor_channel chan,
enum sensor_attribute attr,
const struct sensor_value *val)
{
uint16_t value;
uint16_t cr;
if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
return -ENOTSUP;
}
switch (attr) {
#if CONFIG_TMP112_FULL_SCALE_RUNTIME
case SENSOR_ATTR_FULL_SCALE:
/* the sensor supports two ranges -55 to 128 and -55 to 150 */
/* the value contains the upper limit */
if (val->val1 == 128) {
value = 0x0000;
} else if (val->val1 == 150) {
value = TMP112_CONFIG_EM;
} else {
return -ENOTSUP;
}
if (tmp112_update_config(dev, TMP112_CONFIG_EM, value) < 0) {
LOG_DBG("Failed to set attribute!");
return -EIO;
}
break;
#endif
case SENSOR_ATTR_SAMPLING_FREQUENCY:
#if CONFIG_TMP112_SAMPLING_FREQUENCY_RUNTIME
/* conversion rate in mHz */
cr = val->val1 * 1000 + val->val2 / 1000;
/* the sensor supports 0.25Hz, 1Hz, 4Hz and 8Hz */
/* conversion rate */
switch (cr) {
case 250:
value = TMP112_CONV_RATE(TMP112_CONV_RATE_025);
break;
case 1000:
value = TMP112_CONV_RATE(TMP112_CONV_RATE_1000);
break;
case 4000:
value = TMP112_CONV_RATE(TMP112_CONV_RATE_4);
break;
case 8000:
value = TMP112_CONV_RATE(TMP112_CONV_RATE_8);
break;
default:
return -ENOTSUP;
}
if (tmp112_update_config(dev, TMP112_CONV_RATE_MASK, value) < 0) {
LOG_DBG("Failed to set attribute!");
return -EIO;
}
break;
#endif
default:
return -ENOTSUP;
}
return 0;
}
static int tmp112_sample_fetch(const struct device *dev,
enum sensor_channel chan)
{
struct tmp112_data *drv_data = dev->data;
const struct tmp112_config *cfg = dev->config;
uint16_t val;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_AMBIENT_TEMP);
if (tmp112_reg_read(cfg, TMP112_REG_TEMPERATURE, &val) < 0) {
return -EIO;
}
if (val & TMP112_DATA_EXTENDED) {
drv_data->sample = arithmetic_shift_right((int16_t)val,
TMP112_DATA_EXTENDED_SHIFT);
} else {
drv_data->sample = arithmetic_shift_right((int16_t)val,
TMP112_DATA_NORMAL_SHIFT);
}
return 0;
}
static int tmp112_channel_get(const struct device *dev,
enum sensor_channel chan,
struct sensor_value *val)
{
struct tmp112_data *drv_data = dev->data;
int32_t uval;
if (chan != SENSOR_CHAN_AMBIENT_TEMP) {
return -ENOTSUP;
}
uval = (int32_t)drv_data->sample * TMP112_TEMP_SCALE;
val->val1 = uval / 1000000;
val->val2 = uval % 1000000;
return 0;
}
static const struct sensor_driver_api tmp112_driver_api = {
.attr_set = tmp112_attr_set,
.sample_fetch = tmp112_sample_fetch,
.channel_get = tmp112_channel_get,
};
int tmp112_init(const struct device *dev)
{
const struct tmp112_config *cfg = dev->config;
struct tmp112_data *data = dev->data;
if (!device_is_ready(cfg->bus.bus)) {
LOG_ERR("I2C dev %s not ready", cfg->bus.bus->name);
return -EINVAL;
}
data->config_reg = TMP112_CONV_RATE(cfg->cr) | TMP112_CONV_RES_MASK
| (cfg->extended_mode ? TMP112_CONFIG_EM : 0);
return tmp112_update_config(dev, 0, 0);
}
#define TMP112_INST(inst) \
static struct tmp112_data tmp112_data_##inst; \
static const struct tmp112_config tmp112_config_##inst = { \
.bus = I2C_DT_SPEC_INST_GET(inst), \
.cr = DT_INST_ENUM_IDX(inst, conversion_rate), \
.extended_mode = DT_INST_PROP(inst, extended_mode), \
}; \
\
SENSOR_DEVICE_DT_INST_DEFINE(inst, tmp112_init, NULL, &tmp112_data_##inst, \
&tmp112_config_##inst, POST_KERNEL, \
CONFIG_SENSOR_INIT_PRIORITY, &tmp112_driver_api);
DT_INST_FOREACH_STATUS_OKAY(TMP112_INST)