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drivers: sensor: tmp112: add support for setting ALERT thresholds

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Allows setting tLow/tHigh threasholds via the SENSOR_ATTR_LOWER_THRESH/
SENSOR_ATTR_UPPER_THRESH attributes.

Signed-off-by: Corey Wharton <xodus7@cwharton.com>
This commit is contained in:
Corey Wharton 2025-03-26 19:47:17 -07:00 committed by Benjamin Cabé
parent 7425070ecc
commit 3aebc9d258
3 changed files with 82 additions and 9 deletions
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62
drivers/sensor/ti/tmp112/tmp112.c
View File

@ -58,6 +58,29 @@ static int tmp112_update_config(const struct device *dev, uint16_t mask, uint16_
return rc;
}
static int tmp112_set_threshold(const struct device *dev, uint8_t reg, int64_t micro_c)
{
struct tmp112_data *drv_data = dev->data;
int64_t v;
uint16_t reg_value;
v = DIV_ROUND_CLOSEST(micro_c, TMP112_TEMP_SCALE);
if (drv_data->config_reg & TMP112_CONFIG_EM) {
if (!IN_RANGE(v, TMP112_TEMP_MIN_EM, TMP112_TEMP_MAX_EM)) {
return -EINVAL;
}
reg_value = (uint16_t)v << TMP112_DATA_EXTENDED_SHIFT;
} else {
if (!IN_RANGE(v, TMP112_TEMP_MIN, TMP112_TEMP_MAX)) {
return -EINVAL;
}
reg_value = (uint16_t)v << TMP112_DATA_NORMAL_SHIFT;
}
return tmp112_reg_write(dev->config, reg, reg_value);
}
static int tmp112_attr_set(const struct device *dev, enum sensor_channel chan,
enum sensor_attribute attr, const struct sensor_value *val)
{
@ -87,8 +110,9 @@ static int tmp112_attr_set(const struct device *dev, enum sensor_channel chan,
}
break;
#endif
case SENSOR_ATTR_SAMPLING_FREQUENCY:
#if CONFIG_TMP112_SAMPLING_FREQUENCY_RUNTIME
case SENSOR_ATTR_SAMPLING_FREQUENCY:
/* conversion rate in mHz */
cr = val->val1 * 1000 + val->val2 / 1000;
@ -123,6 +147,12 @@ static int tmp112_attr_set(const struct device *dev, enum sensor_channel chan,
break;
#endif
case SENSOR_ATTR_LOWER_THRESH:
return tmp112_set_threshold(dev, TMP112_REG_TLOW, sensor_value_to_micro(val));
case SENSOR_ATTR_UPPER_THRESH:
return tmp112_set_threshold(dev, TMP112_REG_THIGH, sensor_value_to_micro(val));
default:
return -ENOTSUP;
}
@ -155,17 +185,12 @@ 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;
return sensor_value_from_micro(val, (int32_t)drv_data->sample * TMP112_TEMP_SCALE);
}
static DEVICE_API(sensor, tmp112_driver_api) = {
@ -178,6 +203,7 @@ int tmp112_init(const struct device *dev)
{
const struct tmp112_config *cfg = dev->config;
struct tmp112_data *data = dev->data;
int ret;
if (!device_is_ready(cfg->bus.bus)) {
LOG_ERR("I2C dev %s not ready", cfg->bus.bus->name);
@ -187,7 +213,25 @@ int tmp112_init(const struct device *dev)
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);
ret = tmp112_update_config(dev, 0, 0);
if (ret) {
LOG_ERR("Failed to set configuration (%d)", ret);
return ret;
}
ret = tmp112_set_threshold(dev, TMP112_REG_TLOW, cfg->t_low_micro_c);
if (ret) {
LOG_ERR("Failed to set tLow threshold (%d)", ret);
return ret;
}
ret = tmp112_set_threshold(dev, TMP112_REG_THIGH, cfg->t_high_micro_c);
if (ret) {
LOG_ERR("Failed to set tHigh threshold (%d)", ret);
return ret;
}
return 0;
}
#define TMP112_INST(inst) \
@ -195,6 +239,8 @@ int tmp112_init(const struct device *dev)
static const struct tmp112_config tmp112_config_##inst = { \
.bus = I2C_DT_SPEC_INST_GET(inst), \
.cr = DT_INST_ENUM_IDX(inst, conversion_rate), \
.t_low_micro_c = DT_INST_PROP(inst, t_low_micro_c), \
.t_high_micro_c = DT_INST_PROP(inst, t_high_micro_c), \
.extended_mode = DT_INST_PROP(inst, extended_mode), \
}; \
\

12
drivers/sensor/ti/tmp112/tmp112.h
View File

@ -41,6 +41,16 @@
/* scale in micro degrees Celsius */
#define TMP112_TEMP_SCALE 62500
/* RAW min/max temperature values - LSB=TMP112_TEMP_SCALE */
/* 128C */
#define TMP112_TEMP_MAX 2047
/* -55C */
#define TMP112_TEMP_MIN -880
/* 150C */
#define TMP112_TEMP_MAX_EM 2400
/* -55C */
#define TMP112_TEMP_MIN_EM TMP112_TEMP_MIN
struct tmp112_data {
int16_t sample;
uint16_t config_reg;
@ -49,6 +59,8 @@ struct tmp112_data {
struct tmp112_config {
const struct i2c_dt_spec bus;
uint8_t cr;
int32_t t_low_micro_c;
int32_t t_high_micro_c;
bool extended_mode : 1;
};

17
dts/bindings/sensor/ti,tmp112.yaml
View File

@ -19,6 +19,21 @@ properties:
- 1000
- 4000
- 8000
extended-mode:
description: When true use 13-bit data format allowing measuring temperature up to 128°C
description: When true use 13-bit data format allowing measuring temperature up to 150°C
type: boolean
t-low-micro-c:
description: |
Sets the default tLow threshold in micro-Celsius. The default value is the chip reset
value.
type: int
default: 75000000
t-high-micro-c:
description: |
Sets the default tHigh threshold in micro-Celsius. The default value is the chip reset
value.
type: int
default: 85000000